CA2255742A1 - A dc transformer/reactor - Google Patents

A dc transformer/reactor Download PDF

Info

Publication number
CA2255742A1
CA2255742A1 CA002255742A CA2255742A CA2255742A1 CA 2255742 A1 CA2255742 A1 CA 2255742A1 CA 002255742 A CA002255742 A CA 002255742A CA 2255742 A CA2255742 A CA 2255742A CA 2255742 A1 CA2255742 A1 CA 2255742A1
Authority
CA
Canada
Prior art keywords
transformer
reactor according
reactor
winding
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002255742A
Other languages
French (fr)
Inventor
Mats Leijon
Udo Fromm
Thorsten Schutte
Christian Sasse
Li Ming
Albert Jaksts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB AB
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from SE9602079A external-priority patent/SE9602079D0/en
Priority claimed from SE9700335A external-priority patent/SE508556C2/en
Application filed by Individual filed Critical Individual
Publication of CA2255742A1 publication Critical patent/CA2255742A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K15/00Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12Impregnating, heating or drying of windings, stators, rotors or machines
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/288Shielding
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/32Insulating of coils, windings, or parts thereof
    • H01F27/323Insulation between winding turns, between winding layers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/34Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00Cores, Yokes, or armatures
    • H01F3/10Composite arrangements of magnetic circuits
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00Cores, Yokes, or armatures
    • H01F3/10Composite arrangements of magnetic circuits
    • H01F3/14Constrictions; Gaps, e.g. air-gaps
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/025Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K15/00Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H02K3/14Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots with transposed conductors, e.g. twisted conductors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28Layout of windings or of connections between windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/32Windings characterised by the shape, form or construction of the insulation
    • H02K3/40Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/46Fastening of windings on the stator or rotor structure
    • H02K3/48Fastening of windings on the stator or rotor structure in slots
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/32Insulating of coils, windings, or parts thereof
    • H01F2027/329Insulation with semiconducting layer, e.g. to reduce corona effect
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2203/00Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/15Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/19Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00Electricity: conductors and insulators
    • Y10S174/13High voltage cable, e.g. above 10kv, corona prevention
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00Electricity: conductors and insulators
    • Y10S174/13High voltage cable, e.g. above 10kv, corona prevention
    • Y10S174/14High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00Electricity: conductors and insulators
    • Y10S174/13High voltage cable, e.g. above 10kv, corona prevention
    • Y10S174/14High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding
    • Y10S174/19High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding in a dynamo-electric machine
    • Y10S174/20Stator
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00Electricity: conductors and insulators
    • Y10S174/13High voltage cable, e.g. above 10kv, corona prevention
    • Y10S174/14High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding
    • Y10S174/24High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding in an inductive device, e.g. reactor, electromagnet
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00Electricity: conductors and insulators
    • Y10S174/13High voltage cable, e.g. above 10kv, corona prevention
    • Y10S174/14High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding
    • Y10S174/24High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding in an inductive device, e.g. reactor, electromagnet
    • Y10S174/25Transformer
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00Electricity: conductors and insulators
    • Y10S174/13High voltage cable, e.g. above 10kv, corona prevention
    • Y10S174/26High voltage cable, e.g. above 10kv, corona prevention having a plural-layer insulation system

Abstract

The present invention relates to a DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding. The winding comprises at least one current-carrying conductor. Each winding comprises also an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.

Description

CA 022~742 1998-11-20 A DC TRANSFnRMER/R~ACTOR
Technical field of the invention The present invention relates to a DC transformer/
reactor in accordance with the introductory part of claim 1.
s The DC transformers/reactors have a rating power ranging from several hundred kVA to 1000 MVA and above with a rating voltage from 3-4 kV to very high transmission voltages, up to the order of 1 MV.

Background of the invention lo In order to describe a DC transformer/reactor according to the invention a description of a conventional power transformer will be given.

Reference may be made, for example, to the following well known literature.
The J & P Transformer Book, A Practical Technology of the Power Transformer, by A. C. Franklin and D. P. Franklin, published by Butterworths, edition 11, 1990 Regarding the internal electrical insulation of windings, etc., the following can be mentioned:
Transformerboard, Die Verwendung von Transformerboard in Grossleistungstransformatoren by H. P. Moser, published by H. Weidman AG, CH-8640 Rapperswil.
The latter publication has been published by the insulation manufacturer Weidman in Switzerland and belongs 2s to the basic literature of every transformer manufacturer.
From a purely general point of view, the primary task of a power transformer is to allow exchange of electric energy between two or more electrical systems of, normally, different voltages with the same frequency.
A conventional power transformer comprises a transformer core, in the following referred to as a core, often of laminated oriented sheet, usually of silicon iron.
The core comprises a number of core limbs, connected by yokes which together ~orm one or more core windows.

-CA 022~742 1998-11-20 Transformers with such a core are often referred to as core transformers. Around the core limbs there are a number of windings which are normally referred to as primary, secondary and control windings. As far as power trans-formers are concerned, these windings are practicallyalways concentrically arranged and distributed along the length of the core limbs. As a rule the core transformer has circular coils and a tapered leg section to utili~e the window space as well as possible.
In addition to core type transformers there are shell type transformers. These are often designed with rectangular coils and a rectangular core limb section.
Conventional power transformers, in the lower part of the above-mentioned power range, are sometimes designed with air cooling to carry away the unavoidable inherent losses. For protection against contact, and possibly for reducing the external magnetic field of the transformer, it is then often provided with an outer casing provided with ventilating openings.
Most of the conventional power transformers, however, are oil-cooled. One of the reasons therefor is that the oil has the additional very important function as insulating medium. An oil-cooled and oil-insula~ed power transformer is therefore surrounded by an external tank on which, as will be clear from the description below, very high demands are placed.
~ ormally, means for water-cooling of the coil are provided.
The following part of the description will for the most part refer to oil-filled power transformers.
The windings of the transformer are formed from one or several series-connected coils built up of a number of series-connected turns. In addition, the coils are provided with a special device to allow switching between the terminals of the coils. Such a device may be designed for changeover with the ald of screw joints or more often with the aid of a special changeover switch which is operable in the vicinity of the tank. In the event that changeover can W097/4S848 3 PCTtSE97100889 take place for a transformer under voltage, the changeover switch is referred to as an on-load tap changer whereas otherwise it is referred to as a de-energized tap changer.
A Regarding oil-cooled and oil-insulated power trans-s formers in the upper power range, the breaking elements o~ =
the on-load tap changers are placed in special oil-filled containers with direct connection to the transformer tank.
The breaking elements are operated pureLy mechanically via a motor-driven rotating shaft and are arranged so as to 10 obtain a fast movement during the switching when the contact is open and a slower movement when the contact is to be closed. The on-load tap changers as such, however, are placed in the actual transformer tank. During the operation, arcing and sparking arise. This leads to degrad-15 ation of the oil in the containers. To obtain less arcs and hence also less formation of soot and less wear on the contacts, the on-load tap changers are normally connected to the high-voltage side of the transformer. This is due to the fact that the currents which need to be broken and 20 connected, respectively, are smaller on the high-voltage side than if the on-load tap changers were to be connected to the low-voltage side. Failure statistics of conventional oil-filled power transformers show that it is often the on-load tap changers which give rise to faults.
In the lower power range of oil-cooled and oil-insulated power transformers, both the on-load tap changers and their breaking elements are placed inside the tank.
This means that the above-mentioned problems with degrad-ation of the oil because of arcs during operation, etc., effect the whole oil system.
From the point of view of applied or induced voltage, it can broadly be said that a voltage which is stationary across a winding is distributed equally onto each turn of the winding, that is, the turn voltage is equal on all the turns.
~ rom the point of view of el~ctLic potential, however, the situation is completely different. One end of a winding is normally connected to ground. This means, CA 022~742 1998-11-20 however, that the electric potential of each turn increases linearly from practically zero in the turn which is nearest the ground potential up to a potential in the turns which are at the other end of the winding which correspond to the applied voltage.
This potential distribution determines the compos-ition of the insulation system since it is necessary to have sufficient insulation both between adjacent turns of the winding and between each turn and ground.
Io The turns in an individual coil are normally brought together into a geometrical coherent unit, physically delimited from the other coils. The distance between the coils is also determined by the dielectric stress which may be allowed to occur between the coils This thus means that a certain given insulation distance is also required between the coils. According to the above, sufficient insulation distances are also required to the other electrically conducting objects which are within the electric field from the electric potential locally occurring in the coils.
It is thus clear from the above description that for the individual coils, the voltage difference internally between physically adjacent conductor elements is relatively low whereas the voltage difference externally in ~5 relation to other metal objects - the other coils being included - may be relatively high. The voltage difference is determined by the voltage induced by magnetic induction as well as by the capacitively distributed voltages which may arise from a connected external electrical system on the external connections of the transformer. The voltage types which may enter externally comprise, in addition to operating voltage, lightning overvoltages and switching overvoltages.
In the current leads of the coils, additional losses arise as a result of the magnetic leakage field around the conductor. To keep these losses as low as possible, especially for power transformers in the upper power range, the conductors are normally divided into a number of CA 022~742 1998-11-20 conductor elements, often referred to as strands, which are parallel-connected during operation. These strands must be transposed according to such a pattern that the induced voltage in each strand becomes as identical as possible and s so that the difference in induced voltage between each pair of strands becomes as small as possible for internally circulating current components to be kept down at a reasonable level from the loss point of view.
When designing transformers according to the prior lo art, the general aim is to have as large a quantity of conductor material as possible within a given area limited by the so-called transformer window, generally described as having as high a fill factor as possible. The available space shall comprise, in addition to the conductor material, also the insulating material associated with the coils, partly internally between the coils and partly to other metallic components including the magnetic core.
The insulation system, partly within a coil/winding and partly between coils/windings and other metal parts, is normally designed as a solid cellulose- or varnish-based insulation nearest the individual conductor element, and outside of this as solid cellulose and liquid, possibly also gaseous, insulation. Windings with insulation and possible bracing parts in this way represent large volumes which will be subjected to high electric field strengths which arise in and around the active electromagnetic parts of the transformer. To be able to predetermine the dielectric stresses which arise and achieve a dimensioning with a minimum risk of breakdown, good knowledge of the properties of insulating materials is required. It is also important to achieve such as surrounding environment that it does not change or reduce the insulating properties.
The currently predominant insulation system for high-voltage power transformers comprises cellulose material as 3~ the solid insulation and transformer oil as the liquid insulation. The transformer oil is based on so-called mineral oil.

The transformer oil has a dual function since, in addition to the insulating function, it actively contributes to cooling of the core, the winding, etc., by removal of the loss heat of the transformer. Oil cooling requires an oil pump, an external cooling element, an expansion coupling, etc The electrical connection between the external connections of the transformer and the immediately -connected coils/windings is referred to as a bushing aiming at a conductive connection through the tank which, in the case of oil-filled power transformers, surrounds the actual transformer. The bushing is often a separate component fixed to the tank and is designed to withstand the insulation requirements being made, both on the outside and the inside of the tank, while at the same time it should withstand the current loads occurring and the ensuing current forces.
It should be pointed out that the same requirements for the insulation system as described above regarding the windings also apply to the necessary internal connections between the coils, between bushings and coils, different types of changeover switches and the bushings as such.
All the metallic components inside a power trans-former are normally connected to a given ground potential with the exception of the current-carrying conductors. In this way, the risk of an unwanted, and difficult-to-control, potential increase as a result of capacitve voltage distribution between current leads at high potential and ground is avoided. Such an unwanted potential increase may give rise to partial discharges, so-called corona, Corona may be revealed during the normal acceptance tests, which partially occurs, compared with rated data, increased voltage and frequency. Corona may give rise to damage during operation.
The individual coils in a transformer must have such a mechanical dimensioning that they may withstand any stresses occurring as a consequence of currents arising and the resultant current forces during a short-circuit W097/4~848 7 PCT/SE97/00889 process. Normally, the coils are designed such that the forces arising are absorbed within each individual coil, which in turn may mean that the coil cannot be dimensioned optimally for its normal function during normal operation.
s Within a narrow voltage and power range of oil-filled power transformers, the windings are designed as so-called sheet windings. This means that the individual conductors mentioned above are replaced by thin sheets. Sheet-wound power transformers are manufactured for voltages of up to 10 20-30 kV and powers of up to 20-30 MW.
The insulation system of power transformers within the upper power range requires, in addition to a relatively complicated design, also special manufacturing measures to utilize the properties of the insulation system in the best way. For a good insulation to be obtained, the insulation system shall have a low moisture content, the solid part of the insulation shall be well impregnated with the surrounding oil and the risk of remaining "gas" pockets in the solid part must be minimal. To ensure this, a special drying and impregnating process is carried out on a complete core with windings before it is lowered into a tank. After this drying and impregnating process, the transformer is lowered into the tan~ which is then sealed.
Before filling of oil, the tank with the immersed trans-2s former must be emptied of all air. This is done inconnection with a special vacuum treatment. When this has been carried out, filling of oil takes place.
To be able to obtain the promised service life, etc., pumping out to almost absolute vacuum is required in connection with the vacuum treatment. This thus presupposes that the tank which surrounds the transformer is designed for full vacuum, which entails a considerable consumption of material and manufacturing time.
If electric discharges occur in an oil-filled power transformer, or if a local considerable increase of the temperature in any part of the transformer occurs, the oil is disintegrated and gaseous products are dissolved in the oil. The transformers are therefore normally provided with monitoring devices for detection of gas dissolved in the oil.
For weight reasons large power transformers are transported without oil. In-situ installation of the trans-former at a customer requires, in turn, renewed vacuumtreatment. In addition, this is a process which, further-more, has to be repeated each time the tank is opened for some action or inspection.
It is obvious that these processes are very time-consuming and cost-demanding and constitute a considerable part of the total time for manufacture and repair while at the same time requiring access to extensive resources.
The insulating material in conventional power transformers constitutes a large part of the total volume of the transformer. For a power transformer in the upper power range, oil quantities in the order of magnitude of several tens of cubic metres of transformer oil are not unusual. The oil which exhibits a certain similarity to diesel oil is thinly fluid and exhibits a relatively low flash point. It is thus obvious that oil together with the cellulose constitutes a non-negligible fire hazard in the case of unintentional heating, for example at an internal flashover and a resultant oil spillage.
It is also obvious that, especially in oil-filled power transformers, there is a very large transport problem. Such a power transformer in the upper power range may have a total oil volume of several decades of cubic metres and may have a weight of up to several hundred tons.
It is realized that the external design of the transformer must sometimes be adapted to the current transport profile, that is, for any passage of bridges, tunnels, etc.
The following problem areas regarding conventional oil-filled power transformers will briefly be summarized:
A conventional oil-filled power transformer - comprises an outer tank which is to house a transformer comprising a transformer core with coils, oil for insulation and cooling, mechanical bracing devices of various kinds, etc. Very large mechanical demands are laced on the tank, since, without oil but with a transformer, it shall be capable of being vacuum-treated to practically full vacuum. The tank requires very extensive manufacturing and testing processes and the large external dimensions of 5 the tank also normally entail considerable transport ~ problems;
- normally comprises a so-called pressure-oil cooling.
This cooling method requires the provision of an oil pump, an external cooling element, an expansion vessel and an ~0 expansion coupling, etc.;
- comprises an electrical connection between the external connections of the transformer and the immediately connected coils/windings in the ~orm of a bushing fixed to the tank. The bushing is designed to withstand any insulation requirements made, both regarding the outside and the inside of the tanki - comprises coils/windings whose conductors are divided into a number of conductor elements, strands, which have to be transposed in such a way that the voltage induced in each strand becomes as equal as possible to neighbouring strands in order to minimize induced voltage between neighbouring strandsi - comprises an insulation system, partly within a coil/winding and partly between coils/windings and other metal parts which is designed as a solid cellulose- or varnish-based insulation nearest the individual conductor element and, outside of this, solid cel1ulose and a liquid, possibly also gaseous, insulation. In addition, it is extremely important that the insulation system exhibits a very low moisture contenti - comprises as an integrated part an on-load tap changer, surrounded by oil and normally connected to the high-vol~age winding of the transformer for voltage control;
- comprises oil which may entail a non-negligible fire hazard in connection with internal partial discharges, so-called corona, sparking in on-load tap changers and other fault conditions;

CA 022~742 1998-11-20 - comprises normally a monitoring device for monitoring gas dissolved in the oil, which occurs in case of electrical discharges therein or in case of local increases of the temperature;
- comprises oil which, in the event of damage or accident, may result in oil spillage leading to extensive environmental damage.
The DC transformers/reactors also have the additional problem, that the electric field is a superposition of an A field and of a DC field. The magnetic flux through the core may further contain a dc component leading to quite large designs.

Summary of the invention The object of the present invention is to solve the above mentioned problems and to provide a DC transformer/
reactor wherein all space outside the cable screens are essentially potential free. This object is achieved by providing the DC transformer/reactor, defined in the introductory part of claim 1, with the advantageous features of the characterizing part of said claim.
Accordingly, the winding of the DC transformer/
reactor comprises at least one current-carrying conductor, and each winding comprises an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.
A very important advantage of the present invention, as defined in Claim 1, is that the use of the special winding makes it possible to obtain a DC transformer/
reactor with optimal design regarding the thermal, electric and mechanic design. This results in space reduction between windings with different DC potential, space reduction between windings with DC potential and the core and possible compensation of the air gaps at 50/60 Hz CA 022~742 1998-11-20 by a compensation winding loaded with a capacitor. This will reduce the size, especially of reactors.

Brief description of the drawings Embodiments of the invention are described hereafter, in association with the accompanying drawings in which:
Figure 1 shows the parts included in the current modified standard cable;
Figure 2 shows a transmission schemei Figure 3 shows the electrical field distribution around a winding in a conventional transformer/ reactor;
Figure 4 shows a DC transformer/reactor in accordance with the present invention;
Figure 5 shows a reactor with a compensated air gap according to the present invention;
Figure 6 shows an isometric view of another embodi-ment of a DC transformer incorporating an improved air gap arrangement; and Figure 7 shows the circuit diagram of an integrated arrangement for transformation of high electric power from one DC voltage level to another DC voltage level in accordance with the present invention.

Detailed description of Embodiments An important condition for being able to manufacture a transformer/reactor in accordance with the description of the invention is to use for the winding a conductor cable with an extruded electrical insulation comprising a semiconducting layer both at the conductor and at the casing. Such cables are available as standard cables for other power engineering fields of use. As described under the summary of the invention, however, an improved embodiment of such a standard cable will be used as a winding. To be able to describe an embodiment, a short description of a standard cable will first be made. The CA 022~742 1998-11-20 internal current-carrying conductor comprises a number of strands. Around the strands there is a semiconducting inner casing. Around this semiconducting inner casing, there is an insulating layer of extruded insulation. An example of such an extruded insulation is PEX or, alterna-tively, so-called EP rubber. This insulating layer is surrounded by an external semiconducting layer which, in turn, is surrounded by a metal shield and a sheath. Such a cable will be referred to below as a power cable.
A pre~erred embodiment of the improved cable is shown in Figure 1. Accordingly cable 1 is described in the figure as comprising a current-carrying conductor 2 which comprises both transposed non-insulated and insulated strands. Electromechanically transposed, extruded insulated s~rands are also possible. There is an inner semiconducting layer 3 around the conductor which, in turn, is surrounded by an extruded insulation layer 4.
This layer is surrounded by an external semiconducting layer 5. The cable used as a winding in the preferred embodiment has no metal shield and no external sheath.
Figure 2 shows a transmission scheme. In this figure there is disclosed a transformer including two serie connected, phase-shifted valve bridges 6, 7, wherein the valves are diode valves.
2s Figure 3 shows the electrical field distribution around a winding in a conventional DC transformer/reactor.
In figure 3 there is disclosed a winding 8 wound around a core 9. The reference numeral 10 represents equipotential lines of the electrical field distribution of a conventional winding when the lower part of the winding is on earth potential. The design and the placement of a winding in relation to the core is mainly determined by the electrical field distribution in the core window.
Figure 4 shows a DC transformer/reactor in accordance with the present invention. In figure 4 there is disclosed a three-phase laminated core transformer.
The core comprises in a conventional manner, three core CA 022ss742 1998-11-20 W097l45848 13 PCT/SE97100889 legs 20, 22, and 24 and the connecting yokes 26 and 28.
In the disclosed embodiment both the core legs and the yokes have tapered sections. The DC transformer comprises ~ three concentrical winding turns 30, 32, and 34. The innermost winding turn 30 can represent the primary winding and the two other winding turns 32 and 34 can represent the secondary winding. The DC transformer also comprises spacing rails 36 and 38 with some di~ferent functions. The spacing rails 36 and 38 can be made by isolating material, which functions as a certain space between the concentric winding turns for cooling, bracing.
It shall be pointed out that the DC transformer disclosed in figure 4, as opposed to the transformer disclosed in figure 3, will not present any electrical fields outside lS the cables of the windings.
Figure 5 shows a principle sketch of a reactor for DC plants with a compensated air gap in accordance with the present invention. The reactor comprises a magnetic core 60 and a winding 62 comprising a cable in accordance with figure 1. The reactor also comprises an air gap 64 in the core 60. Air gap means in this context any way to achieve a zone with lowered permittivity in the magnetic main flux. The reactor also comprises a compensation wind-ing 66 which is capacitively loaded with a capacitor 68.
Another way of achieving this zone with lowered permittivity in the magnetic main flux is by reducing the air gap length, e.g. by dividing the air gap into a series of smaller air gaps in order to limit the radial components of the magnetic flux. Yet another way of achieving this zone with lowered permittivity in the magnetic main flux is to use another material than air, wherein the material has a relative permeability ~r which satisfies the expression 1 < ~r C ~core-Figure 6 shows an isometric view of another embodiment of a DC transformer incorporating an improvedair gap arrangement. The magnetic core structure with an orthogonal or radial air gap for low acoustic noise is CA 022~742 l998-ll-20 shown in fig. 3. This three-legged magnetic core is comprised by an essentially rectangular one-piece outer member 30 having opposing side sections 30s and end sections 30e, and by a cylindrical center member 31 that is continuous in the longitudinal direction. A pair of aligned circular apertures or openings 32 are machined into the two outer member end sections 30e, or alternatively the rectangular outer member is pressed into this shape. The opposite ends of cylindrical center member 31 respectively extend into aligned circular apertures 32 to thereby define at eithe~ end a radial magnetic air gap of constant predetermined length that is further circumferentially continuous and uninterrupted. A
non-magnetic spacer 33 is mounted in the magnetic air gap lS space between each end section 30e and the respective end of center member 31 to maintain the radial air gap and support the center member. A winding assembly wound directly on the center member or on a toothed split bobbin, is placed about the center member in the window areas 35 provided between outer and center members 30 and 31. If desired, spacer 33 at one end can be eliminated and a zero air gap provided at that end.
~ igure 7 shows the circuit diagram of an integrated arrangement for transformation of high electric power from 2s one DC voltage level to another DC voltage level.
A DC/DC power transformer is provided which is an arrangement for direct transformation of high electric power from one DC voltage level to another DC voltage level without an intermediate AC voltage network. The DC
voltage is today basically used for transmission of high electric power at long distances. The DC voltage level for these transmissions are of the order of several 100 kV. The DC/DC power transformer allows several DC voltage levels to be used by connecting DC networks wi~h different 3s voltages. The principle for this arrangement is that the valve windings (43, 45) from one or several converter transformers (47) are connected to two valve bridges, W097/45848 l5 PCT/SE97/00889 which generate opposing cyclically variating magnetic flows in the transformer cores (44). One of the valve bridges is operated as an inverter (42) and the other as a rectifier (46) and in this manner the power is transformed 5 from one DC voltage level (Ud1~to another (Ud2). At high voltage levels the leakage inductances in the transformers will be high for conventional transformers as a consequence of the large insulation distances and therefore special arrangements must be made in order to commutate the magnetic energy from one phase of the transformer to another without creating great losses.
A DC transformer in accordance with the present invention can be made with very low leakage inductances.
The DC transformer/reactor in accordance with the present invention can e.g. be a HVDC or MVDC transformer/
reactor.
The invention is not limited to the embodiments described in the foregoing. It will be obvious that many different modifications are possible within the scope of ~o the following claims.

Claims (30)

1. A DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding, characterized in that the winding comprises at least one current-carrying conductor and each winding comprises an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.
2. A DC transformer/reactor according to claim 1, characterized in that at least one of said semiconducting layers has in the main equal thermal expansion coefficient as said solid insulation.
3. A DC transformer/reactor according to claim 2, characterized in that the potential of the inner one of said layers is essentially equal to the potential of the conductor.
4. A DC transformer/reactor according to claim 2 or 3, characterized in that an outer one of said layers is arranged in such a way that it constitutes an equipotential surface surrounding the conductor.
5. A DC transformer/reactor according to claim 4, characterized in that said outer layer is connected to a specific potential.
6. A DC transformer/reactor according to claim 5, characterized in that said specific potential is ground potential.
7. A DC transformer/reactor according to any one of claims 1, 2, 3, 4, 5, or 6, characterized in that at least two of said layers have substantially equal thermal expansion coefficients.
8. A DC transformer/reactor according to any of the previous claims, characterized in that the current-carrying conductor comprises a number of strands, only a minority of the strands being non-isolated from each other.
9. A DC transformer/reactor according to any one of the preceding claims, characterized in that, each of said two layers and said solid insulation is fixed connected to adjacent layer or solid insulation along substantially the, whole connecting surface.
10. A DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding, characterized in that the winding comprises a cable (1) comprising at least one current-carrying conductor (2), - each conductor (2) comprises a umber of strands, - around said conductor (2) is arranged an inner semiconducting layer (3), - around said conductor (2) is arranged an inner semiconducting layer (3), - around said inner semiconducting layer (3) is arranged an insulating layer (4) of solid insulation, and - around said insulating layer (4) is arranged an outer semiconducting layer (5).
11. A DC transformer/reactor according to claim 10, characterized in that said cable also comprises a metal shield and a sheath.
12. A DC transformer/reactor according to Claim 11, characterized in that the cable has a diameter comprised in the approximate interval 20-250 mm and a conductor are comprised in the approximate interval 80-3000 mm2.
13. A DC transformer/reactor according to any of Claims 1-12, characterized in that windings on different potentials are wound in direct contact to each other.
14. A DC transformer/reactor according to any of Claims 1-13, characterized in that a winding on DC potential versus the core is wound directly on, or very near the core.
15. A DC transformer/reactor according to any of Claims 1-14. characterized in that the magnetic circuits exposed for DC magnetisation comprise at least one zone with lowered permittivity in the magnetic main flux.
16. A DC transformer/reactor according to Claim 15, characterized in that the zone with lowered permittivity is accomplished with an air gap arranged in said core.
17. A DC transformer/reactor according to claim 15, characterized in that the zone with lowered permittivity is accomplished with a series of small air gaps arranged in said core.
18. A DC transformer/reactor according to claim 15, characterized in the zone with lowered permittivity is accomplished with a gap arranged in said core, wherein said gap is made of a material with a relative permeability, µr, which satisfies the expression 1 ~ µr ~
µcore.
19. A DC transformer/reactor according to any of Claims 15-18, characterized in that said core comprises an essentially rectangular outer member having opposing side sections and connecting end sections and further comprises a cylindrical center member that is continuous in the longitudinal direction, said core end sections having a pair of aligned circular apertures extending completely there through into which opposite ends of said cylindrical center member extend to define between at least one end section and the respective end of said center member a radial magnetic air gap of constant predetermined length for controlling the permeability of said core.
20. A DC transformer/reactor according to any of Claims 16, 17, or 19, characterized in tat each air gap is compensated by a capacitively loaded compensation winding.
21. A DC transformer/reactor according to any of Claims 1-20, characterized in that said transformer/ reactor also comprises a housing including at least thyristor valve.
22. A DC transformer/reactor according to Claim 21, characterized in that all of said thyristor valves are of the integrated type.
23. A DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding, characterized in that the winding comprises at least one current-carrying conductor, and also comprising an insulation system, which comprises at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, which insulation system in respect of its thermal and electrical properties permits a voltage level in said HVDC
transformer/reactor exceeding 36 kV.
24. An integrated back-to-back station, characterized in that said station comprises two transformers/groups of DC
transformers according to any of Claims 1-23.
25. An integrated arrangement for transformation of high electric power from one DC voltage level to another DC
voltage level, characterized in that said arrangement comprising a DC transformer according to any of Claims 1-23, wherein the DC transformer comprising first valve windings and second valve windings, wherein the first valve windings are connected to a first valve bridge and the second valve windings are connected to a second valve bridge, whereby the first valve bridge is operated as an inverter and the second valve bridge is operated as a rectifier.
26. An integrated arrangement according to Claim 25, characterized in that said first valve bridge comprising at least one six-pulse inverter bridge which includes a plurality of self-commutated thyristors and further comprising a plurality of diodes, each diode being connected antiparallel to a self-commutated thyristor, and said second valve bridge comprising a six-pulse rectifier bridge which includes a plurality of diode valves.
27. A DC transformer/reactor according to Claim 13 or 14, characterized in that the cable is specially adapted for mixed voltage.
28. A reactor for DC plants according to Claim 20, characterized in that said compensation winding is loaded with a variable capacitance so as to be able to vary the inductance of the reactor.
29. A DC transformer/reactor according to any of Claims 10-22, 27, characterized in that said outer semiconducting layer (5) is cut in a number of parts, each of which is connected to ground potential.
30. A DC transformer/reactor according to any of Claims 1-22, 27, and 29, characterized in that the DC
transformer/reactor also comprising at least one sensor/transducer for monitoring and diagnostics.
CA002255742A 1996-05-29 1997-05-27 A dc transformer/reactor Abandoned CA2255742A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE9602079-7 1996-05-29
SE9602079A SE9602079D0 (en) 1996-05-29 1996-05-29 Rotating electric machines with magnetic circuit for high voltage and a method for manufacturing the same
SE9700335-4 1997-02-03
SE9700335A SE508556C2 (en) 1997-02-03 1997-02-03 Power transformer and reactor with windings with conductors
PCT/SE1997/000889 WO1997045848A1 (en) 1996-05-29 1997-05-27 A dc transformer/reactor

Publications (1)

Publication Number Publication Date
CA2255742A1 true CA2255742A1 (en) 1997-12-04

Family

ID=26662650

Family Applications (4)

Application Number Title Priority Date Filing Date
CA002255742A Abandoned CA2255742A1 (en) 1996-05-29 1997-05-27 A dc transformer/reactor
CA002256347A Abandoned CA2256347A1 (en) 1996-05-29 1997-05-27 Electromagnetic device
CA002256469A Abandoned CA2256469A1 (en) 1996-05-29 1997-05-27 Transformer/reactor
CA002256535A Abandoned CA2256535A1 (en) 1996-05-29 1997-05-27 Rotating electrical machine plants

Family Applications After (3)

Application Number Title Priority Date Filing Date
CA002256347A Abandoned CA2256347A1 (en) 1996-05-29 1997-05-27 Electromagnetic device
CA002256469A Abandoned CA2256469A1 (en) 1996-05-29 1997-05-27 Transformer/reactor
CA002256535A Abandoned CA2256535A1 (en) 1996-05-29 1997-05-27 Rotating electrical machine plants

Country Status (32)

Country Link
US (3) US6940380B1 (en)
EP (4) EP0906651A2 (en)
JP (4) JP2000511387A (en)
KR (3) KR20000016123A (en)
CN (4) CN1105413C (en)
AP (3) AP936A (en)
AR (3) AR007337A1 (en)
AT (2) ATE261203T1 (en)
AU (4) AU714564B2 (en)
BG (3) BG63415B1 (en)
BR (3) BR9709489A (en)
CA (4) CA2255742A1 (en)
CO (4) CO4650244A1 (en)
CZ (3) CZ387998A3 (en)
DE (3) DE69728972T2 (en)
EA (4) EA000993B1 (en)
EE (1) EE03461B1 (en)
GE (1) GEP20022779B (en)
ID (3) ID18779A (en)
IL (3) IL127098A0 (en)
IS (3) IS1798B (en)
NO (4) NO985499D0 (en)
NZ (4) NZ333016A (en)
OA (2) OA10927A (en)
PE (3) PE73098A1 (en)
PL (4) PL182736B1 (en)
SK (2) SK164198A3 (en)
TR (4) TR199802465T2 (en)
TW (2) TW443024B (en)
UA (1) UA44857C2 (en)
WO (4) WO1997045847A1 (en)
YU (1) YU54498A (en)

Families Citing this family (76)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0901705B1 (en) * 1996-05-29 2003-09-24 Abb Ab Insulated conductor for high-voltage windings
GB2331856B (en) * 1997-11-28 2002-02-27 Asea Brown Boveri Electricity supply system
GB2331854A (en) * 1997-11-28 1999-06-02 Asea Brown Boveri Transformer
GB2331861A (en) * 1997-11-28 1999-06-02 Asea Brown Boveri Traction motor winding having a conductor with semi-conductor insulation layers
NL1010664C2 (en) * 1998-11-27 2000-05-30 Belden Wire & Cable Bv Electric conductor.
JP2000173836A (en) 1998-12-01 2000-06-23 Mitsubishi Electric Corp Electrostatic induction equipment
FR2793599B1 (en) * 1999-05-10 2001-07-06 Transfix Toulon Soc Nouv DRY ISOLATED MV / LV TRANSFORMER WITH A LINEARLY DISTRIBUTED ELECTRIC FIELD FOR THE DISTRIBUTION OF ELECTRICAL ENERGY IN RURAL AREAS
GB2350485A (en) * 1999-05-28 2000-11-29 Asea Brown Boveri A fault current limiter
GB2350488A (en) * 1999-05-28 2000-11-29 Asea Brown Boveri Winding construiction in a high voltage rotating electrical machine
GB2350486A (en) * 1999-05-28 2000-11-29 Asea Brown Boveri A power transformer / reactor
SE9904753L (en) * 1999-12-23 2001-06-24 Abb Ab Use of HVDC insulated conductors in magnetic flow carriers
GB2361109A (en) * 2000-04-03 2001-10-10 Abb Ab Inductive device with a magnetic field bias arrangement
US20050030140A1 (en) 2000-04-03 2005-02-10 Mikael Dahlgren Multiphase induction device
SE0002093L (en) * 2000-06-06 2001-12-07 Abb Ab Device for direct current generation and electrical power generating plant
JP2002027693A (en) 2000-07-10 2002-01-25 Mitsubishi Electric Corp Coil conductor for dynamo-electric machine
KR20020007098A (en) * 2000-07-15 2002-01-26 박선순 A high frequency power apparatus using a complete coupling transformer
SE520332C2 (en) * 2001-02-09 2003-06-24 Abb Ab Procedure for mounting stator winding
DE10132718A1 (en) 2001-07-05 2003-02-13 Abb T & D Tech Ltd Method for winding a three-phase cable transformer with coaxial cable and winding device therefor
US6670721B2 (en) 2001-07-10 2003-12-30 Abb Ab System, method, rotating machine and computer program product for enhancing electric power produced by renewable facilities
DE10137270A1 (en) 2001-07-31 2003-02-20 Aloys Wobben Wind energy installation has a ring generator with a stator having grooves spaced at intervals on an internal or external periphery for receiving a stator winding.
SE520942C2 (en) 2002-01-23 2003-09-16 Abb Ab Electric machine and its use
JP4162191B2 (en) * 2002-04-05 2008-10-08 住友電気工業株式会社 Cooling method for superconducting cable track
JP2006503505A (en) * 2002-10-17 2006-01-26 アンビエント・コーポレイション Repeater sharing a common medium for communication
KR20040037857A (en) * 2002-10-30 2004-05-08 한국전력공사 Multi-pulse transmission system
TW200514334A (en) * 2003-09-05 2005-04-16 Black & Decker Inc Field assemblies and methods of making same
JP4390546B2 (en) * 2003-12-19 2009-12-24 トヨタ自動車株式会社 Rotating electric machine
DE102005012371A1 (en) * 2005-03-09 2006-09-14 Siemens Ag Twelve-pulse high-voltage direct-current meeting
KR100882856B1 (en) * 2007-03-16 2009-02-10 김선호 Protection Circuit for Power Supply Line with Noise Filter
DE102007053685A1 (en) * 2007-11-10 2009-05-14 Abb Technology Ag Manufacturing method for a multi-layer transformer winding with insulation layer
GB2462257B (en) * 2008-07-29 2010-09-29 Clean Current Power Systems Electrical machine with dual insulated coil assembly
ATE515780T1 (en) * 2008-09-26 2011-07-15 Bruker Biospin Sa HIGH VOLTAGE UP DRY POWER TRANSFORMER AND POWER SUPPLY UNIT WITH AT LEAST ONE OF THESE TRANSFORMERS
US8089332B2 (en) * 2009-03-27 2012-01-03 Korea Polytechnic University Industry Academic Cooperation Foundation Superconducting power transforming apparatus
WO2011008514A2 (en) 2009-06-30 2011-01-20 Teco-Westinghouse Motor Company Pluggable power cell for an inverter and providing modular power conversion
CN102082021B (en) * 2009-11-30 2012-02-22 成都深蓝高新技术发展有限公司 Three-phase reactor with six-hole iron core
KR101034989B1 (en) * 2010-07-23 2011-05-17 김선호 Power quality improvement devices
US8492662B2 (en) 2011-02-28 2013-07-23 Abb Inc. Arc-resistant dry type transformer enclosure having arc fault damper apparatus
US8456838B2 (en) 2011-02-28 2013-06-04 Abb Inc. Arc-resistant dry type transformer enclosure having arc channels
US8375566B2 (en) 2011-02-28 2013-02-19 Abb Inc. Method of providing arc-resistant dry type transformer enclosure
KR101293240B1 (en) * 2011-04-07 2013-08-09 티에스 주식회사 Electric Vehicle for Multi Strand Wire Motor
KR101129158B1 (en) * 2011-04-14 2012-03-23 엘에스산전 주식회사 Method for designing basic insulation level of smoothing reactor in hvdc system
WO2012162435A2 (en) * 2011-05-23 2012-11-29 Active Power, Inc. Insulation system for prevention of corona discharge
US8391938B2 (en) * 2011-06-15 2013-03-05 Electric Power Research Institute, Inc. Transportable rapid deployment superconducting transformer
US8901790B2 (en) 2012-01-03 2014-12-02 General Electric Company Cooling of stator core flange
CN107672236B (en) * 2012-06-29 2019-10-11 魏克控股公司 Insulation component for being electrically insulated in high pressure range
EP2885865A1 (en) * 2012-08-16 2015-06-24 ABB Technology Ltd. Power converter assembly
JP2014052119A (en) * 2012-09-06 2014-03-20 Chiyoda Corp Air-cooled heat exchange device
ES2532363T3 (en) * 2012-09-12 2015-03-26 Abb Technology Ag Transformer
EP2711934B1 (en) * 2012-09-25 2018-07-11 Nexans Silicone multilayer insulation for electric cable
JP2014087141A (en) * 2012-10-23 2014-05-12 Hitachi Ltd Rotary machine and drive system therefor
WO2014100649A1 (en) * 2012-12-20 2014-06-26 Cargill, Incorporated Enzymatically-degummed oil and uses thereof
US9199327B2 (en) * 2013-01-29 2015-12-01 Shenzhen Jasic Technology Co., Ltd. Portable IGBT arc welding machine
FR3006099B1 (en) * 2013-05-22 2015-05-08 Nexans ELECTRICAL CABLE COMPRISING AT LEAST ONE ELECTRICALLY INSULATING LAYER
CN103996490B (en) * 2014-04-30 2017-02-22 东莞市光华实业有限公司 Method for designing conjugate three-phase electric reactor
BR112017002352A2 (en) 2014-08-07 2017-11-28 Henkel Ag & Co Kgaa electroceramic sheath of a wire for use in a beam power transmission cable
US10147523B2 (en) * 2014-09-09 2018-12-04 Panasonic Avionics Corporation Cable, method of manufacture, and cable assembly
CN105680706A (en) * 2014-11-18 2016-06-15 台达电子工业股份有限公司 Direct current power supply apparatus
WO2017029676A1 (en) * 2015-08-19 2017-02-23 KAFRI, Amizur Hybrid superconducting magnetic device
EP3365954B1 (en) * 2015-12-21 2019-07-31 Siemens Aktiengesellschaft Longitudinal voltage source and direct current transmission system with longitudinal voltage source
WO2017175330A1 (en) * 2016-04-06 2017-10-12 三菱電機株式会社 Electric motor, air blower, compressor, and air conditioning device
RU168615U1 (en) * 2016-05-11 2017-02-13 федеральное государственное бюджетное образовательное учреждение высшего образования "Нижегородский государственный технический университет им. Р.Е. Алексеева" (НГТУ) Autonomous AC Power Station
DE202016105638U1 (en) * 2016-10-08 2016-11-03 Faurecia Autositze Gmbh Motor vehicle interior arrangement
WO2018139246A1 (en) * 2017-01-30 2018-08-02 合同会社IP Bridge1号 Coreless electromechanical device
US10608830B2 (en) 2017-02-06 2020-03-31 Mh Gopower Company Limited Power over fiber enabled sensor system
PL3379548T3 (en) 2017-03-24 2020-05-18 Abb Schweiz Ag High voltage winding and a high voltage electromagnetic induction device
WO2018233833A1 (en) 2017-06-22 2018-12-27 Abb Schweiz Ag A method for operating an electric-arc furnace, a power electronic converter, and an electric-arc furnace system
JP7170389B2 (en) * 2017-11-28 2022-11-14 住友重機械工業株式会社 gear motor
US10910916B2 (en) 2017-11-30 2021-02-02 General Electric Company Fluid cooled and fluid insulated electric machine
CN110091758B (en) * 2018-01-31 2022-02-08 株洲中车时代电气股份有限公司 Oil tank type ground passing neutral section device
EP3769322A4 (en) 2018-03-21 2022-01-12 Cargill, Incorporated Synthetic ester and mineral oil dielectric fluids with increased stability
CN109167478A (en) * 2018-07-27 2019-01-08 广州顺途信息科技有限公司 Brushless motor
RU2703287C1 (en) * 2018-10-08 2019-10-16 Акционерное общество "Корпорация "Стратегические пункты управления" АО "Корпорация "СПУ - ЦКБ ТМ" Current-limiting device with divided feeder group reactor by number of consumers
CN110473698A (en) * 2019-08-02 2019-11-19 全球能源互联网研究院有限公司 A kind of insulating sleeve and preparation method thereof of DC isolation transformer
RU196814U1 (en) * 2020-02-08 2020-03-17 Общество с ограниченной ответственностью "Росэнерготранс" (ООО "Росэнерготранс") REACTOR WIRING WIRE
US11640861B2 (en) * 2021-05-10 2023-05-02 Te Connectivity Solutions Gmbh Power cable which reduces skin effect and proximity effect
CN113310635B (en) * 2021-05-26 2023-01-13 广西电网有限责任公司南宁供电局 CVT oil tank defect detecting and processing device
CN114268175B (en) * 2021-12-27 2023-03-28 西安交通大学 Ultrahigh-voltage multiphase permanent magnet wind driven generator and power generation system

Family Cites Families (532)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1304451A (en) 1919-05-20 Locke h
DE425551C (en) 1926-02-20 Bbc Brown Boveri & Cie Device for the magnetic closure of open slots in electrical machines
DE523047C (en) 1931-04-18 Brown Boveir & Cie Ag Process for the production of slot wedges with iron sheets layered transversely to the longitudinal direction of the wedge for electrical machines
DE406371C (en) 1924-11-21 Bergmann Elek Citaets Werke Ak Machine for the conversion or for the simultaneous generation of alternating currents of different frequencies with fields of different number of poles, which are expediently combined on an inductor, and induced windings assigned to these fields, possibly combined into a common winding
US295699A (en) 1884-03-25 Machine for cutting grain
DE386561C (en) 1923-12-13 Bergmann Elek Citaets Werke Ak Machine for the conversion or for the simultaneous generation of alternating currents of different frequencies
DE426793C (en) 1926-03-18 Bbc Brown Boveri & Cie Device for the magnetic closure of open slots in electrical machines
DE568508C (en) 1933-01-20 Bbc Brown Boveri & Cie AC high-voltage generator with at least two electrically separate windings
DE572030C (en) 1933-03-09 Bbc Brown Boveri & Cie Cooling device for the winding heads of high-voltage machines
DE336418C (en) 1921-05-02 Stanislaus Berger Support for electrical lines to be led on walls
DE435608C (en) 1926-10-18 Bbc Brown Boveri & Cie Divided conductor for electrical machines
US681800A (en) 1901-06-18 1901-09-03 Oskar Lasche Stationary armature and inductor.
US847008A (en) 1904-06-10 1907-03-12 Isidor Kitsee Converter.
DE372390C (en) 1915-12-09 1923-03-27 Bergmann Elek Citaets Werke Ak Machine for the conversion or for the simultaneous generation of alternating currents of different frequencies with the same or different number of phases
GB123906A (en) 1918-05-31 1919-03-13 Brush Electrical Eng Improvements in or pertaining to Windings in Electrical Apparatus.
US1418856A (en) 1919-05-02 1922-06-06 Allischalmers Mfg Company Dynamo-electric machine
DE443011C (en) 1919-07-19 1927-04-13 Bbc Brown Boveri & Cie Installation on high-voltage windings in electrical machines
US1481585A (en) 1919-09-16 1924-01-22 Electrical Improvements Ltd Electric reactive winding
DE387973C (en) 1921-06-04 1924-01-09 Hellmuth Beyer Arrangement of the coils to reduce the leakage in transformers with a disc-like winding structure
DE482506C (en) 1921-07-09 1929-09-14 Bbc Brown Boveri & Cie Device for short-circuit-proof fastening of involute-shaped stator winding heads of air-cooled electrical machines
DE460124C (en) 1922-10-10 1928-05-22 Bbc Brown Boveri & Cie Laminated magnetic wedge to close the winding grooves of electrical machines
US1756672A (en) 1922-10-12 1930-04-29 Allis Louis Co Dynamo-electric machine
DE433749C (en) 1923-11-25 1926-09-07 Bbc Brown Boveri & Cie Coil winding of alternating current machines, which carry very strong currents, with ring-shaped connecting conductors
US1508456A (en) 1924-01-04 1924-09-16 Perfection Mfg Co Ground clamp
DE432169C (en) 1924-01-15 1926-07-26 Bbc Brown Boveri & Cie Device for the magnetic closure of open slots in electrical machines
DE441717C (en) 1924-03-02 1927-03-11 Bbc Brown Boveri & Cie Divided conductor for electrical machines
DE435609C (en) 1924-03-02 1926-10-18 Bbc Brown Boveri & Cie Divided conductor for electrical machines
GB268271A (en) 1926-06-12 1927-03-31 Pirelli & C Improvements in or relating to joints for high tension electric cables
DE468827C (en) * 1926-08-07 1928-11-23 Friedrich Pfaffenberger Inhaler
DE501181C (en) 1927-02-19 1930-07-03 Felten & Guilleaume Carlswerk Process for the manufacture of cables for electrical overhead lines
GB292999A (en) 1927-06-29 1929-04-11 Siemens Ag Arrangement of core segments in the casings of dynamo electric machines, rotary transformers and the like
GB293861A (en) 1927-07-15 1928-11-08 Westinghouse Electric & Mfg Co Improvements in or relating to radio coupling devices and conductors therefor
US1728915A (en) 1928-05-05 1929-09-24 Earl P Blankenship Line saver and restrainer for drilling cables
US1781308A (en) 1928-05-30 1930-11-11 Ericsson Telefon Ab L M High-frequency differential transformer
US1762775A (en) 1928-09-19 1930-06-10 Bell Telephone Labor Inc Inductance device
GB319313A (en) 1928-09-20 1929-07-18 Siemens Ag The regulation of the electric potential of long lines
DE629301C (en) 1929-02-28 1936-04-27 Hartstoff Metall Akt Ges Hamet Iron core for electrical machines
US1747507A (en) 1929-05-10 1930-02-18 Westinghouse Electric & Mfg Co Reactor structure
US1742985A (en) 1929-05-20 1930-01-07 Gen Electric Transformer
DE584639C (en) 1929-12-28 1933-09-27 Aeg Corona protection for windings in electrical machines
US1861182A (en) 1930-01-31 1932-05-31 Okonite Co Electric conductor
US1904885A (en) * 1930-06-13 1933-04-18 Western Electric Co Capstan
US1974406A (en) 1930-12-13 1934-09-25 Herbert F Apple Dynamo electric machine core slot lining
DE604972C (en) 1931-02-27 1934-10-12 Otis Aufzugswerke Ges M B H Door drive for elevators
DE586121C (en) 1932-05-01 1933-10-18 Felix Kleiss Dipl Ing Process for the implementation of wires and tapes through baths
US2006170A (en) 1933-05-11 1935-06-25 Gen Electric Winding for the stationary members of alternating current dynamo-electric machines
DE719009C (en) 1935-05-30 1942-03-26 Aeg Equipment for the operation of electrical rail feeders
FR805544A (en) 1936-04-29 1936-11-21 Travail Electr Des Metaux Soc Method and device for adjusting voltages in a static transformer
DE673545C (en) 1936-07-30 1939-03-24 Siemens Schuckertwerke Akt Ges Multiphase scatter transformer made up of single-phase transformers
NL54036C (en) 1937-09-15
FR847899A (en) 1937-12-23 1939-10-18 Lignes Telegraph Telephon Transformer
FR841351A (en) 1938-01-19 1939-05-17 Manufacturing process of laminated or divided magnetic circuits
US2217430A (en) 1938-02-26 1940-10-08 Westinghouse Electric & Mfg Co Water-cooled stator for dynamoelectric machines
US2206856A (en) 1938-05-31 1940-07-02 William E Shearer Transformer
US2305153A (en) 1938-11-26 1942-12-15 Fries Eduard Adjustable transformer with high reactance
FR864380A (en) 1939-12-01 1941-04-25 Entpr Chemin Improvements to steam winches for piling piling and the like
GB540456A (en) 1940-04-17 1941-10-17 Austin Walters & Son Ltd Improvements in or relating to self-regulating electric transformers
US2241832A (en) 1940-05-07 1941-05-13 Hugo W Wahlquist Method and apparatus for reducing harmonics in power systems
US2256897A (en) 1940-07-24 1941-09-23 Cons Edison Co New York Inc Insulating joint for electric cable sheaths and method of making same
US2295415A (en) 1940-08-02 1942-09-08 Westinghouse Electric & Mfg Co Air-cooled, air-insulated transformer
US2251291A (en) 1940-08-10 1941-08-05 Western Electric Co Strand handling apparatus
GB589071A (en) 1942-03-27 1947-06-11 Gen Electric Co Ltd Improvements in protective shields in high-voltage apparatus
US2415652A (en) 1942-06-03 1947-02-11 Kerite Company High-voltage cable
US2462651A (en) 1944-06-12 1949-02-22 Gen Electric Electric induction apparatus
DE975999C (en) 1944-09-16 1963-01-10 Siemens Ag Method and device for the operation of single-phase railway contact lines that are fed from at least two feed points
US2424443A (en) 1944-12-06 1947-07-22 Gen Electric Dynamoelectric machine
US2459322A (en) 1945-03-16 1949-01-18 Allis Chalmers Mfg Co Stationary induction apparatus
US2409893A (en) * 1945-04-30 1946-10-22 Westinghouse Electric Corp Semiconducting composition
US2436306A (en) 1945-06-16 1948-02-17 Westinghouse Electric Corp Corona elimination in generator end windings
FR916959A (en) 1945-07-03 1946-12-20 Improvements to transformers for electrical welding and similar applications
US2446999A (en) 1945-11-07 1948-08-17 Gen Electric Magnetic core
US2498238A (en) 1947-04-30 1950-02-21 Westinghouse Electric Corp Resistance compositions and products thereof
NL143510B (en) 1947-12-04 Wiese Hans Holger BUCKET TRANSPORTER.
CH266037A (en) 1948-02-13 1950-01-15 Sip Karel Collapsible ladder.
US2650350A (en) * 1948-11-04 1953-08-25 Gen Electric Angular modulating system
DE875227C (en) 1948-12-31 1953-04-30 Siemens Ag Rotary field machine with concentrated windings and pronounced poles with pole pieces
DE846583C (en) 1949-02-18 1952-08-14 Siemens Ag Iron core for electrical devices, especially transformers, chokes or the like.
US2721905A (en) 1949-03-04 1955-10-25 Webster Electric Co Inc Transducer
FR1011924A (en) 1949-04-23 1952-07-01 Improvements to rotating electrical machines
GB685416A (en) 1950-04-08 1953-01-07 Westinghouse Electric Int Co Improvements in or relating to stationary electrical induction apparatus
DE1638176U (en) 1952-02-12 1952-05-15 Bosch & Speidel CUFF FOR BLOOD PRESSURE MEASUREMENT.
GB702892A (en) 1952-02-14 1954-01-27 Asea Ab Electric railway system
GB715226A (en) 1952-04-07 1954-09-08 Dowty Equipment Ltd Improvements relating to electro-magnetic coils
US2749456A (en) * 1952-06-23 1956-06-05 Us Electrical Motors Inc Waterproof stator construction for submersible dynamo-electric machine
GB723457A (en) 1952-07-07 1955-02-09 Standard Telephones Cables Ltd Joint for an electric cable
BE534972A (en) 1953-03-23
GB739962A (en) 1953-03-23 1955-11-02 Standard Telephones Cables Ltd Improvements in coaxial conductor electric cables
US2780771A (en) 1953-04-21 1957-02-05 Vickers Inc Magnetic amplifier
NL195374A (en) 1954-03-11
GB827600A (en) 1954-12-13 1960-02-10 Shiro Sasaki Electric transformers and the like
US2962679A (en) 1955-07-25 1960-11-29 Gen Electric Coaxial core inductive structures
GB805721A (en) 1955-10-29 1958-12-10 Comp Generale Electricite Improvements in or relating to three-phase magnetic circuits
US2846599A (en) 1956-01-23 1958-08-05 Wetomore Hodges Electric motor components and the like and method for making the same
US2947957A (en) 1957-04-22 1960-08-02 Zenith Radio Corp Transformers
US2885581A (en) 1957-04-29 1959-05-05 Gen Electric Arrangement for preventing displacement of stator end turns
CA635218A (en) 1958-01-02 1962-01-23 W. Smith John Reinforced end turns in dynamoelectric machines
US2943242A (en) 1958-02-05 1960-06-28 Pure Oil Co Anti-static grounding device
US2975309A (en) 1958-07-18 1961-03-14 Komplex Nagyberendezesek Expor Oil-cooled stators for turboalternators
GB854728A (en) 1958-09-29 1960-11-23 British Thomson Houston Co Ltd Improvements relating to electrical transformers
GB870583A (en) 1958-12-01 1961-06-14 Okonite Co Method of making electric cables
FR1238795A (en) 1959-07-06 1960-08-19 Fournitures Pour L Electrolyse Improvements to electrical transformers
DE1807391U (en) 1959-08-29 1960-03-03 Heinrich Ungruhe BASE RING FOR FITING STRAP.
CH395369A (en) 1959-09-18 1965-07-15 Asea Ab Corona shield on an induction coil provided with insulation in a vacuum furnace and method for producing a corona shield
US3014139A (en) * 1959-10-27 1961-12-19 Gen Electric Direct-cooled cable winding for electro magnetic device
US3157806A (en) 1959-11-05 1964-11-17 Bbc Brown Boveri & Cie Synchronous machine with salient poles
US3158770A (en) 1960-12-14 1964-11-24 Gen Electric Armature bar vibration damping arrangement
US3098893A (en) 1961-03-30 1963-07-23 Gen Electric Low electrical resistance composition and cable made therefrom
US3130335A (en) 1961-04-17 1964-04-21 Epoxylite Corp Dynamo-electric machine
US3197723A (en) 1961-04-26 1965-07-27 Ite Circuit Breaker Ltd Cascaded coaxial cable transformer
GB992249A (en) 1961-08-23 1965-05-19 Urho Leander Wertanen Electrical impedance devices
GB1024583A (en) 1961-10-26 1966-03-30 Ass Elect Ind Improvements in and relating to electric transformers
US3143269A (en) 1961-11-29 1964-08-04 Crompton & Knowles Corp Tractor-type stock feed
CH391071A (en) 1962-03-01 1965-04-30 Bbc Brown Boveri & Cie Laminated stator bodies for electrical machines, in particular turbo generators
GB965741A (en) 1962-03-02 1964-08-06 Core Mfg Company Transformer core
SE305899B (en) 1962-06-15 1968-11-11 O Andersson
NL297703A (en) 1962-09-25
DE1465719A1 (en) 1963-03-15 1969-05-22 Ibm Transformer cables with multiple coaxial conductors and their method of manufacture
US3268766A (en) 1964-02-04 1966-08-23 Du Pont Apparatus for removal of electric charges from dielectric film surfaces
US3372283A (en) 1965-02-15 1968-03-05 Ampex Attenuation control device
SE318939B (en) 1965-03-17 1969-12-22 Asea Ab
US3304599A (en) 1965-03-30 1967-02-21 Teletype Corp Method of manufacturing an electromagnet having a u-shaped core
US3333044A (en) 1965-04-23 1967-07-25 William A Toto Passageway structure for liquid coolant at gun and transformer ends of welding cable having novel internal surface bearing for alternate polarity strands
DE1488353A1 (en) 1965-07-15 1969-06-26 Siemens Ag Permanent magnet excited electrical machine
CA812934A (en) 1965-07-19 1969-05-13 Cuny Robert Rotary transformer for coupling multi-phase systems having a small frequency difference
GB1135242A (en) 1965-09-13 1968-12-04 Ass Elect Ind Improvements in or relating to packing means for conductors in stator slots of dynamo-electric machines
US3365657A (en) 1966-03-04 1968-01-23 Nasa Usa Power supply
GB1117433A (en) 1966-06-07 1968-06-19 English Electric Co Ltd Improvements in alternating current generators
GB1103099A (en) 1966-06-24 1968-02-14 Phelps Dodge Copper Prod Improvements in or relating to shielded electric cable
GB1103098A (en) 1966-06-24 1968-02-14 Phelps Dodge Copper Prod Improvements in or relating to shielded electric cable
US3444407A (en) 1966-07-20 1969-05-13 Gen Electric Rigid conductor bars in dynamoelectric machine slots
US3484690A (en) 1966-08-23 1969-12-16 Herman Wald Three current winding single stator network meter for 3-wire 120/208 volt service
US3418530A (en) 1966-09-07 1968-12-24 Army Usa Electronic crowbar
US3354331A (en) 1966-09-26 1967-11-21 Gen Electric High voltage grading for dynamoelectric machine
GB1147049A (en) 1966-09-28 1969-04-02 Parsons C A & Co Ltd Improvements in and relating to transformer windings
US3392779A (en) * 1966-10-03 1968-07-16 Certain Teed Prod Corp Glass fiber cooling means
US3437858A (en) 1966-11-17 1969-04-08 Glastic Corp Slot wedge for electric motors or generators
AT272436B (en) 1967-04-10 1969-07-10 Peter Dipl Ing Dr Techn Klaudy Method of overload protection using superconductors
GB1174659A (en) 1967-04-21 1969-12-17 Elektromat Veb Mechanism for Inserting Coils into Grooves of the Stators of Electric Machines
SU469196A1 (en) * 1967-10-30 1975-04-30 Engine-generator installation for power supply of passenger cars
FR1555807A (en) 1967-12-11 1969-01-31
GB1226451A (en) 1968-03-15 1971-03-31
CH479975A (en) 1968-08-19 1969-10-15 Oerlikon Maschf Head bandage for an electrical machine
GB1268770A (en) 1968-11-21 1972-03-29 Kenneth Grundy Electrical connector
US3651402A (en) 1969-01-27 1972-03-21 Honeywell Inc Supervisory apparatus
US3813764A (en) 1969-06-09 1974-06-04 Res Inst Iron Steel Method of producing laminated pancake type superconductive magnets
US3651244A (en) 1969-10-15 1972-03-21 Gen Cable Corp Power cable with corrugated or smooth longitudinally folded metallic shielding tape
SE326758B (en) 1969-10-29 1970-08-03 Asea Ab
US3614692A (en) 1970-06-02 1971-10-19 Magnetech Ind Inc Variable induction device
US3666876A (en) * 1970-07-17 1972-05-30 Exxon Research Engineering Co Novel compositions with controlled electrical properties
FR2108171A1 (en) 1970-09-29 1972-05-19 Sumitomo Electric Industries Insulated electric cable - incorporating an insulating layer and an easily strippable semiconductor layer
DE2050312A1 (en) 1970-10-13 1972-04-20 Siemens Ag Multiple choke with damping of symmetrical interference currents
US3631519A (en) 1970-12-21 1971-12-28 Gen Electric Stress graded cable termination
US3675056A (en) 1971-01-04 1972-07-04 Gen Electric Hermetically sealed dynamoelectric machine
US3644662A (en) 1971-01-11 1972-02-22 Gen Electric Stress cascade-graded cable termination
US3660721A (en) * 1971-02-01 1972-05-02 Gen Electric Protective equipment for an alternating current power distribution system
GB1395152A (en) 1971-02-01 1975-05-21 Int Research & Dev Co Ltd Altering current dynamo-electric machine windings
DE2111086A1 (en) 1971-03-09 1972-09-14 Siemens Ag Stand sheet metal cutting of electrical machines
GB1340983A (en) 1971-03-10 1973-12-19 Siemens Ag Superconductor cables
US3684906A (en) 1971-03-26 1972-08-15 Gen Electric Castable rotor having radially venting laminations
US3684821A (en) 1971-03-30 1972-08-15 Sumitomo Electric Industries High voltage insulated electric cable having outer semiconductive layer
US3716719A (en) 1971-06-07 1973-02-13 Aerco Corp Modulated output transformers
JPS4831403A (en) 1971-08-27 1973-04-25
US3746954A (en) 1971-09-17 1973-07-17 Sqare D Co Adjustable voltage thyristor-controlled hoist control for a dc motor
US3727085A (en) 1971-09-30 1973-04-10 Gen Dynamics Corp Electric motor with facility for liquid cooling
DE2155371C2 (en) 1971-11-08 1982-06-24 Appt, geb. Kirschmann, Emma, 7000 Stuttgart Device for shaping the winding heads of electrical machines
US3740600A (en) 1971-12-12 1973-06-19 Gen Electric Self-supporting coil brace
US3743867A (en) * 1971-12-20 1973-07-03 Massachusetts Inst Technology High voltage oil insulated and cooled armature windings
DE2164078A1 (en) 1971-12-23 1973-06-28 Siemens Ag DRIVE ARRANGEMENT WITH A LINEAR MOTOR DESIGNED IN THE TYPE OF A SYNCHRONOUS MACHINE
BE793731A (en) 1972-01-05 1973-05-02 English Electric Co Ltd ELECTROGENERATORS
SU425268A1 (en) 1972-02-29 1974-04-25 желого электромашиностроени при Лысьвенском турбогенераторном ELECTRIC MACHINE STATOR
US3699238A (en) 1972-02-29 1972-10-17 Anaconda Wire & Cable Co Flexible power cable
FR2175579B1 (en) 1972-03-14 1974-08-02 Thomson Brandt
US3758699A (en) 1972-03-15 1973-09-11 G & W Electric Speciality Co Apparatus and method for dynamically cooling a cable termination
US3716652A (en) 1972-04-18 1973-02-13 G & W Electric Speciality Co System for dynamically cooling a high voltage cable termination
US3748555A (en) 1972-05-01 1973-07-24 Westinghouse Electric Corp Protective circuit for brushless synchronous motors
US3787607A (en) 1972-05-31 1974-01-22 Teleprompter Corp Coaxial cable splice
US3968388A (en) 1972-06-14 1976-07-06 Kraftwerk Union Aktiengesellschaft Electric machines, particularly turbogenerators, having liquid cooled rotors
CH547028A (en) 1972-06-16 1974-03-15 Bbc Brown Boveri & Cie GLIME PROTECTION FILM, THE PROCESS FOR ITS MANUFACTURING AND THEIR USE IN HIGH VOLTAGE WINDINGS.
US3801843A (en) 1972-06-16 1974-04-02 Gen Electric Rotating electrical machine having rotor and stator cooled by means of heat pipes
US3792399A (en) 1972-08-28 1974-02-12 Nasa Banded transformer cores
US3778891A (en) 1972-10-30 1973-12-18 Westinghouse Electric Corp Method of securing dynamoelectric machine coils by slot wedge and filler locking means
US3932791A (en) 1973-01-22 1976-01-13 Oswald Joseph V Multi-range, high-speed A.C. over-current protection means including a static switch
US3995785A (en) 1973-02-12 1976-12-07 Essex International, Inc. Apparatus and method for forming dynamoelectric machine field windings by pushing
CA1028440A (en) 1973-02-26 1978-03-21 Uop Inc. Polymer compositions with treated filler
FR2222738B1 (en) 1973-03-20 1976-05-21 Unelec
SE371348B (en) 1973-03-22 1974-11-11 Asea Ab
US3781739A (en) 1973-03-28 1973-12-25 Westinghouse Electric Corp Interleaved winding for electrical inductive apparatus
CH549467A (en) 1973-03-29 1974-05-31 Micafil Ag PROCESS FOR MANUFACTURING A COMPRESSED LAYERING MATERIAL.
US3881647A (en) 1973-04-30 1975-05-06 Lebus International Inc Anti-slack line handling device
CH560448A5 (en) 1973-07-06 1975-03-27 Bbc Brown Boveri & Cie
US4084307A (en) 1973-07-11 1978-04-18 Allmanna Svenska Elektriska Aktiebolaget Method of joining two cables with an insulation of cross-linked polyethylene or another cross linked linear polymer
US3828115A (en) 1973-07-27 1974-08-06 Kerite Co High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof
DE2351340A1 (en) 1973-10-12 1975-04-24 Siemens Ag TAPE REEL FOR TRANSFORMERS
GB1433158A (en) 1973-11-19 1976-04-22 Pirelli General Cable Works Electric cable installations
US3947278A (en) 1973-12-19 1976-03-30 Universal Oil Products Company Duplex resistor inks
US3912957A (en) 1973-12-27 1975-10-14 Gen Electric Dynamoelectric machine stator assembly with multi-barrel connection insulator
DE2400698A1 (en) 1974-01-08 1975-07-10 Krim Samhalov Izmail Self-excited machine with two separate stator windings - windings star-connected with second capacitively closed for excitation
SE384420B (en) 1974-01-31 1976-05-03 Ericsson Telefon Ab L M ELECTRICAL CABLE WITH SYNTHETIC INSULATION AND AN OUTER SEMICONDUCTIVE LAYER
US4109098A (en) * 1974-01-31 1978-08-22 Telefonaktiebolaget L M Ericsson High voltage cable
CA1016586A (en) 1974-02-18 1977-08-30 Hubert G. Panter Grounding of outer winding insulation to cores in dynamoelectric machines
US4039740A (en) 1974-06-19 1977-08-02 The Furukawa Electric Co., Ltd. Cryogenic power cable
DE2430792C3 (en) 1974-06-24 1980-04-10 Siemens Ag, 1000 Berlin Und 8000 Muenchen Power cable with plastic insulation and outer conductive layer
FR2285693A1 (en) 1974-09-19 1976-04-16 Matsushita Electric Ind Co Ltd ENCAPSULATED ELECTROMAGNETIC COIL WITH SYNTHETIC RESIN
GB1479904A (en) 1974-10-15 1977-07-13 Ass Elect Ind Alternating current power transmission systems
US3902000A (en) 1974-11-12 1975-08-26 Us Energy Termination for superconducting power transmission systems
US3943392A (en) 1974-11-27 1976-03-09 Allis-Chalmers Corporation Combination slot liner and retainer for dynamoelectric machine conductor bars
CH579844A5 (en) * 1974-12-04 1976-09-15 Bbc Brown Boveri & Cie
US3965408A (en) 1974-12-16 1976-06-22 International Business Machines Corporation Controlled ferroresonant transformer regulated power supply
DE2600206C2 (en) 1975-01-06 1986-01-09 The Reluxtrol Co., Seattle, Wash. Device for non-destructive material testing using the eddy current method
US4091138A (en) 1975-02-12 1978-05-23 Sumitomo Bakelite Company Limited Insulating film, sheet, or plate material with metallic coating and method for manufacturing same
AT338915B (en) 1975-02-18 1977-09-26 Dukshtau Alexandr Antonovich STAND FOR ELECTRIC MACHINERY
JPS51113110A (en) 1975-03-28 1976-10-06 Mitsubishi Electric Corp Drive system for inductor type synchronous motor
US4008409A (en) 1975-04-09 1977-02-15 General Electric Company Dynamoelectric machine core and coil assembly
US3971543A (en) 1975-04-17 1976-07-27 Shanahan William F Tool and kit for electrical fishing
US4132914A (en) * 1975-04-22 1979-01-02 Khutoretsky Garri M Six-phase winding of electric machine stator
DE2520511C3 (en) 1975-05-07 1978-11-30 Siemens Ag, 1000 Berlin Und 8000 Muenchen Device for supporting the rotor winding of a salient pole rotor of a four-pole or higher-pole electrical machine
ZA753046B (en) 1975-05-12 1976-09-29 Gec South Africa Pty Transformer cooling
SE7605754L (en) 1975-05-22 1976-11-23 Reynolds Metals Co ELECTRICAL CABLE
US4031310A (en) 1975-06-13 1977-06-21 General Cable Corporation Shrinkable electrical cable core for cryogenic cable
US3993860A (en) * 1975-08-18 1976-11-23 Samuel Moore And Company Electrical cable adapted for use on a tractor trailer
US4091139A (en) 1975-09-17 1978-05-23 Westinghouse Electric Corp. Semiconductor binding tape and an electrical member wrapped therewith
US4258280A (en) 1975-11-07 1981-03-24 Bbc Brown Boveri & Company Limited Supporting structure for slow speed large diameter electrical machines
US4085347A (en) 1976-01-16 1978-04-18 White-Westinghouse Corporation Laminated stator core
AT340523B (en) 1976-04-27 1977-12-27 Hitzinger & Co Dipl Ing BRUSHLESS SYNC GENERATOR
HU175494B (en) 1976-04-29 1980-08-28 Magyar Kabel Muevek Shielded power-current cable
DE2622309C3 (en) 1976-05-19 1979-05-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen Protective device for a brushless synchronous machine
US4047138A (en) 1976-05-19 1977-09-06 General Electric Company Power inductor and transformer with low acoustic noise air gap
JPS5325886A (en) 1976-08-21 1978-03-10 Sumitomo Electric Ind Ltd Brid ged polyolefine insulating hightension cable having outer semiconductor layers which can be treated off easily
US4064419A (en) 1976-10-08 1977-12-20 Westinghouse Electric Corporation Synchronous motor KVAR regulation system
US4103075A (en) 1976-10-28 1978-07-25 Airco, Inc. Composite monolithic low-loss superconductor for power transmission line
US4041431A (en) 1976-11-22 1977-08-09 Ralph Ogden Input line voltage compensating transformer power regulator
SU625290A1 (en) 1976-11-30 1978-09-25 Специальное Конструкторское Бюро "Энергохиммаш" Electric motor
US4099227A (en) 1976-12-01 1978-07-04 Square D Company Sensor circuit
DE2656389C3 (en) 1976-12-13 1979-11-29 Siemens Ag, 1000 Berlin Und 8000 Muenchen Synchronous linear motor
FR2376542A1 (en) 1976-12-30 1978-07-28 Aroshidze Jury Spring mounted stator core of electrical machine - is attached to stator frame at points of maximum stiffness to form rigid structure
US4200817A (en) 1977-01-20 1980-04-29 Bbc Brown Boveri & Company Limited Δ-Connected, two-layer, three-phase winding for an electrical machine
IT1113513B (en) 1977-03-16 1986-01-20 Pirelli IMPROVEMENT CONCERNING THE CABLES FOR ENERGY
JPS53120117A (en) 1977-03-30 1978-10-20 Hitachi Ltd Excitation control system for generator
US4149101A (en) 1977-05-12 1979-04-10 Lesokhin Albert Z Arrangement for locking slot wedges retaining electric windings
DE2721905C2 (en) 1977-05-14 1986-02-20 Thyssen Industrie Ag, 4300 Essen Method of manufacturing a three-phase alternating current winding for a linear motor
US4134036A (en) 1977-06-03 1979-01-09 Cooper Industries, Inc. Motor mounting device
US4152615A (en) 1977-06-14 1979-05-01 Westinghouse Electric Corp. End iron axial flux damper system
DE2729067A1 (en) 1977-06-28 1979-01-11 Kabel Metallwerke Ghh MEDIUM OR HIGH VOLTAGE ELECTRIC CABLE
US4177418A (en) 1977-08-04 1979-12-04 International Business Machines Corporation Flux controlled shunt regulated transformer
US4164672A (en) 1977-08-18 1979-08-14 Electric Power Research Institute, Inc. Cooling and insulating system for extra high voltage electrical machine with a spiral winding
US4184186A (en) 1977-09-06 1980-01-15 General Electric Company Current limiting device for an electric power system
US4160193A (en) 1977-11-17 1979-07-03 Richmond Abraham W Metal vapor electric discharge lamp system
PL123224B1 (en) 1977-11-30 1982-09-30 Inst Spawalnictwa Welding transformer of dropping external characteristic
US4134146A (en) 1978-02-09 1979-01-09 General Electric Company Surge arrester gap assembly
US4177397A (en) 1978-03-17 1979-12-04 Amp Incorporated Electrical connections for windings of motor stators
SU792302A1 (en) 1978-04-04 1980-12-30 Предприятие П/Я В-8833 Transformer
US4164772A (en) 1978-04-17 1979-08-14 Electric Power Research Institute, Inc. AC fault current limiting circuit
DE2824951A1 (en) 1978-06-07 1979-12-20 Kabel Metallwerke Ghh METHOD OF MANUFACTURING A STATOR FOR A LINEAR MOTOR
CH629344A5 (en) 1978-06-08 1982-04-15 Bbc Brown Boveri & Cie DEVICE FOR SUPPORTING THE FIELD DEVELOPMENT OF A POLE WHEEL WITH EXCELLENT POLES.
US4321426A (en) * 1978-06-09 1982-03-23 General Electric Company Bonded transposed transformer winding cable strands having improved short circuit withstand
US4208597A (en) 1978-06-22 1980-06-17 Westinghouse Electric Corp. Stator core cooling for dynamoelectric machines
SU694939A1 (en) 1978-06-22 1982-01-07 Научно-Исследовательский Сектор Всесоюзного Ордена Ленина Проектно-Изыскательского И Научно-Исследовательского Института "Гидропроект" Им.С.Я.Жука Generator stator
DE2925934A1 (en) 1978-07-06 1980-01-24 Vilanova Luis Montplet MAGNETIC DEVICE, IN PARTICULAR FOR DETECTING FAULTS OF UNDERGROUND ELECTRIC CABLES
US4200818A (en) 1978-08-01 1980-04-29 Westinghouse Electric Corp. Resin impregnated aromatic polyamide covered glass based slot wedge for large dynamoelectric machines
DE2835386A1 (en) 1978-08-12 1980-02-21 Kabel Metallwerke Ghh Three=phase AC winding for linear motor - is made by preforming cables which are wound on drum, fastened on supports and then placed in slots
DE2836229C2 (en) 1978-08-17 1983-12-15 Siemens AG, 1000 Berlin und 8000 München Stator winding of an electrical machine
CA1095601A (en) 1978-08-28 1981-02-10 Alfred M. Hase Regulating transformer with magnetic shunt
DE2839517C2 (en) 1978-09-11 1986-05-07 Thyssen Industrie Ag, 4300 Essen Process for the production of a prefabricated winding for linear motors
JPS6028226B2 (en) 1978-09-20 1985-07-03 株式会社日立製作所 salient pole rotor
JPS6044764B2 (en) * 1978-11-09 1985-10-05 株式会社フジクラ Cable conductor manufacturing method
US4207482A (en) 1978-11-14 1980-06-10 Westinghouse Electric Corp. Multilayered high voltage grading system for electrical conductors
US4238339A (en) 1978-11-27 1980-12-09 Fridman Vladimir M Arrangement for supporting stator end windings of an electric machine
JPS5579676A (en) 1978-12-13 1980-06-16 Toshiba Corp Harmonic filter for electric power
DE2854520A1 (en) 1978-12-16 1980-06-26 Bbc Brown Boveri & Cie ELECTRIC COIL
CH651975A5 (en) 1979-01-10 1985-10-15 Bbc Brown Boveri & Cie PROTECTIVE DEVICE ON A TURBO GROUP AGAINST SUBSYNCHRONOUS RESONANCES.
US4317001A (en) 1979-02-23 1982-02-23 Pirelli Cable Corp. Irradiation cross-linked polymeric insulated electric cable
US4281264A (en) 1979-02-26 1981-07-28 General Electric Company Mounting of armature conductors in air-gap armatures
US4262209A (en) * 1979-02-26 1981-04-14 Berner Charles A Supplemental electrical power generating system
SE416693B (en) 1979-03-08 1981-01-26 Elmekano I Lulea Ab DEVICE FOR PHASE COMPENSATION AND MAGNETIZATION OF AN ASYNCHRONIC MACHINE FOR OPERATING AS GENERATOR
SU873370A1 (en) 1979-03-11 1981-10-15 Предприятие П/Я М-5113 Synchronous machine excitation system
FR2452167A1 (en) 1979-03-20 1980-10-17 Aerospatiale PROCESS FOR THE PRODUCTION OF A MAGNETIC FRAME WITH DIVIDED STRUCTURE AND REINFORCEMENT THUS OBTAINED
GB2045626B (en) 1979-03-22 1983-05-25 Oriental Metal Seizo Co Process and apparatus for the distillation of water
CH641599A5 (en) 1979-03-27 1984-02-29 Streiff Mathias Ag METHOD AND DEVICE FOR LAYING AND FASTENING HEAVY ELECTRIC CABLES IN A CABLE CHANNEL.
DE2913697C2 (en) 1979-04-05 1986-05-22 kabelmetal electro GmbH, 3000 Hannover Prefabricated winding for a linear motor
DE2917717A1 (en) 1979-05-02 1980-11-27 Kraftwerk Union Ag Turbogenerator stator cooling segments - have parallel channels extending from to distributor to zone of stator teeth
DE2920478C2 (en) 1979-05-21 1986-06-26 kabelmetal electro GmbH, 3000 Hannover Prefabricated three-phase alternating current winding for a linear motor
DE2920477A1 (en) * 1979-05-21 1980-12-04 Kabel Metallwerke Ghh Prefabricated three-phase alternating current winding for a linear motor
DE2921114A1 (en) 1979-05-25 1980-12-04 Bosch Gmbh Robert WINDING PROCESS FOR AN ELECTRIC GENERATOR AND THREE-PHASE GENERATOR PRODUCED AFTER THIS
US4357542A (en) 1979-07-12 1982-11-02 Westinghouse Electric Corp. Wind turbine generator system
US4255684A (en) 1979-08-03 1981-03-10 Mischler William R Laminated motor stator structure with molded composite pole pieces
US4292558A (en) 1979-08-15 1981-09-29 Westinghouse Electric Corp. Support structure for dynamoelectric machine stators spiral pancake winding
DE2939004A1 (en) 1979-09-26 1981-04-09 Siemens AG, 1000 Berlin und 8000 München Synchronous linear motor for rail vehicle drive - has field winding divided into switched sections with inter-looped current lines
US4320645A (en) 1979-10-11 1982-03-23 Card-O-Matic Pty. Limited Apparatus for fabricating electrical equipment
FR2467502A1 (en) 1979-10-11 1981-04-17 Ducellier & Cie Electric starter motor rotor winding for vehicle - has minimal depth slots with offset conductors to minimise flux distortion
JPS5675411U (en) 1979-11-15 1981-06-19
SU961048A1 (en) * 1979-12-06 1982-09-23 Научно-Исследовательский Сектор Всесоюзного Ордена Ленина Проектно-Изыскательского И Научно-Исследовательского Института "Гидропроект" Им.С.Я.Жука Generator stator
DE3002945A1 (en) 1980-01-29 1981-07-30 Anton Piller Kg, 3360 Osterode TRANSFORMER SYSTEM
EP0033847B1 (en) 1980-02-11 1985-05-02 Siemens Aktiengesellschaft Turbine set with a generator providing a constant-frequency mains supply
DE3006382C2 (en) 1980-02-21 1985-10-31 Thyssen Industrie Ag, 4300 Essen Three-phase alternating current winding for a linear motor
DE3008212C2 (en) 1980-03-04 1985-06-27 Robert Bosch Gmbh, 7000 Stuttgart Process for the production of stator windings for three-phase alternators
DE3008818A1 (en) 1980-03-05 1981-09-10 Siemens AG, 1000 Berlin und 8000 München Jointing sleeve for HT cables - with plastic cylinder over metal tube and insulating tape wraps
EP0055779B1 (en) 1980-04-03 1985-10-16 The Fujikura Cable Works, Ltd. Process for manufacturing stranded conductor comprising insulated conductor strands
FR2481531A1 (en) 1980-04-23 1981-10-30 Cables De Lyon Geoffroy Delore SPLICING METHOD AND SPLICE FOR COAXIAL CABLE WITH MASSIVE INSULATION
DE3016990A1 (en) 1980-05-02 1981-11-12 Kraftwerk Union AG, 4330 Mülheim DEVICE FOR FIXING WINDING RODS IN SLOTS OF ELECTRICAL MACHINES, IN PARTICULAR TURBOGENERATORS
CA1140198A (en) * 1980-05-23 1983-01-25 National Research Council Of Canada Laser triggered high voltage rail gap switch
US4594630A (en) 1980-06-02 1986-06-10 Electric Power Research Institute, Inc. Emission controlled current limiter for use in electric power transmission and distribution
US4353612A (en) 1980-06-06 1982-10-12 The National Telephone Supply Company Shield connector
DE3031866A1 (en) 1980-08-23 1982-04-01 Brown, Boveri & Cie Ag, 6800 Mannheim LADDER BAR FOR ELECTRICAL MACHINE
US4384944A (en) 1980-09-18 1983-05-24 Pirelli Cable Corporation Carbon filled irradiation cross-linked polymeric insulation for electric cable
US4330726A (en) * 1980-12-04 1982-05-18 General Electric Company Air-gap winding stator construction for dynamoelectric machine
DE3050661C2 (en) 1980-12-18 1985-07-18 Vsesojuznyj proektno-izyskatel'skij i nau&ccaron;no-issledovatel'skij institut Gidroproekt imeni S.Ja. &Scaron;uka, Moskau/Moskva Arrangement for connecting two conductor rod ends
US4404486A (en) 1980-12-24 1983-09-13 General Electric Company Star connected air gap polyphase armature having limited voltage gradients at phase boundaries
DE3101217C2 (en) 1981-01-16 1984-08-23 Smit Transformatoren B.V., Nijmegen Winding for a dry-type transformer with spacer arrangement
AT378287B (en) 1981-01-30 1985-07-10 Elin Union Ag HIGH VOLTAGE WINDING FOR ELECTRICAL MACHINES
US4361723A (en) * 1981-03-16 1982-11-30 Harvey Hubbell Incorporated Insulated high voltage cables
SU955369A1 (en) * 1981-03-26 1982-08-30 Научно-Исследовательский Сектор Всесоюзного Ордена Ленина Проектно-Изыскательского И Научно-Исследовательского Института "Гидропроект" Им.С.Я.Жука Electric machine stator
US4368418A (en) 1981-04-21 1983-01-11 Power Technologies, Inc. Apparatus for controlling high voltage by absorption of capacitive vars
US4401920A (en) * 1981-05-11 1983-08-30 Canadian Patents & Development Limited Laser triggered high voltage rail gap switch
GB2099635B (en) 1981-05-29 1985-07-03 Harmer & Simmons Ltd Ransformers for battery charging systems
US4367425A (en) 1981-06-01 1983-01-04 Westinghouse Electric Corp. Impregnated high voltage spacers for use with resin filled hose bracing systems
US4365178A (en) * 1981-06-08 1982-12-21 General Electric Co. Laminated rotor for a dynamoelectric machine with coolant passageways therein
SE426895B (en) 1981-07-06 1983-02-14 Asea Ab PROTECTOR FOR A SERIES CONDENSOR IN A HIGH VOLTAGE NETWORK
US4449768A (en) 1981-07-23 1984-05-22 Preformed Line Products Company Shield connector
AU557924B2 (en) 1981-07-28 1987-01-15 Pirelli General Plc Heat shielding electric cables
DE3129928A1 (en) 1981-07-29 1983-02-24 Anton Piller GmbH & Co KG, 3360 Osterode ROTATING TRANSFORMER
US4470884A (en) 1981-08-07 1984-09-11 National Ano-Wire, Inc. High speed aluminum wire anodizing machine and process
CA1164851A (en) 1981-08-17 1984-04-03 Ali Pan Reeling of cable
US4368399A (en) 1981-08-17 1983-01-11 Westinghouse Electric Corp. Rotor end turn winding and support structure
US4387316A (en) 1981-09-30 1983-06-07 General Electric Company Dynamoelectric machine stator wedges and method
US4475075A (en) 1981-10-14 1984-10-02 Munn Robert B Electric power generator and system
US4426771A (en) 1981-10-27 1984-01-24 Emerson Electric Co. Method of fabricating a stator for a multiple-pole dynamoelectric machine
US4520287A (en) * 1981-10-27 1985-05-28 Emerson Electric Co. Stator for a multiple-pole dynamoelectric machine and method of fabricating same
US4431960A (en) 1981-11-06 1984-02-14 Fdx Patents Holding Company, N.V. Current amplifying apparatus
US4437464A (en) 1981-11-09 1984-03-20 C.R. Bard, Inc. Electrosurgical generator safety apparatus
US4469267A (en) 1982-01-15 1984-09-04 Western Gear Corporation Draw-off and hold-back cable tension machine
SU1019553A1 (en) 1982-02-23 1983-05-23 Харьковский Ордена Ленина Авиационный Институт Им.Н.Е.Жуковского Electric machine stator
CA1222788A (en) * 1982-05-14 1987-06-09 Roderick S. Taylor Uv radiation triggered rail-gap switch
US4425521A (en) 1982-06-03 1984-01-10 General Electric Company Magnetic slot wedge with low average permeability and high mechanical strength
US4546210A (en) 1982-06-07 1985-10-08 Hitachi, Ltd. Litz wire
US4443725A (en) 1982-06-14 1984-04-17 General Electric Company Dynamoelectric machine stator wedge
DE3229480A1 (en) 1982-08-06 1984-02-09 Transformatoren Union Ag, 7000 Stuttgart DRY TRANSFORMER WITH WINDINGS POOLED IN CAST RESIN
JPS5928852A (en) 1982-08-06 1984-02-15 Hitachi Ltd Salient-pole type rotary electric machine
US4481438A (en) 1982-09-13 1984-11-06 Electric Power Research Institute, Inc. High voltage electrical generator and windings for use therein
JPS5956825A (en) 1982-09-21 1984-04-02 三菱電機株式会社 Ac current limiting device
US4473765A (en) 1982-09-30 1984-09-25 General Electric Company Electrostatic grading layer for the surface of an electrical insulation exposed to high electrical stress
US4508251A (en) * 1982-10-26 1985-04-02 Nippon Telegraph And Telephone Public Corp. Cable pulling/feeding apparatus
JPS5986110A (en) 1982-11-09 1984-05-18 住友電気工業株式会社 Crosslinked polyethylene insulated cable
GB2140195B (en) 1982-12-03 1986-04-30 Electric Power Res Inst Cryogenic cable and method of making same
CH659910A5 (en) 1983-01-27 1987-02-27 Bbc Brown Boveri & Cie AIR THROTTLE COIL AND METHOD FOR THEIR PRODUCTION.
DE3305225A1 (en) * 1983-02-16 1984-08-16 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau High-voltage DC-transmission power station in a block circuit
GB2136214B (en) 1983-03-11 1986-05-29 British Aerospace Pulse transformer
DE3309051C2 (en) 1983-03-14 1986-10-02 Thyssen Industrie Ag, 4300 Essen Three-phase alternating current winding for a linear motor
EP0120154A1 (en) * 1983-03-25 1984-10-03 TRENCH ELECTRIC, a Division of Guthrie Canadian Investments Limited Continuously transposed conductor
US4619040A (en) 1983-05-23 1986-10-28 Emerson Electric Co. Method of fabricating stator for a multiple pole dynamoelectric machine
US4510476A (en) 1983-06-21 1985-04-09 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration High voltage isolation transformer
DE3323696A1 (en) 1983-07-01 1985-01-10 Thyssen Industrie Ag, 4300 Essen METHOD AND DEVICE FOR LAYING A PRE-MANUFACTURED WINDING OF A LINEAR MOTOR
US4523169A (en) * 1983-07-11 1985-06-11 General Electric Company Dry type transformer having improved ducting
US4590416A (en) 1983-08-08 1986-05-20 Rig Efficiency, Inc. Closed loop power factor control for power supply systems
US4565929A (en) 1983-09-29 1986-01-21 The Boeing Company Wind powered system for generating electricity
US4510077A (en) 1983-11-03 1985-04-09 General Electric Company Semiconductive glass fibers and method
US4503284A (en) 1983-11-09 1985-03-05 Essex Group, Inc. RF Suppressing magnet wire
IT1195482B (en) 1983-11-18 1988-10-19 Meccanica Di Precisione Spa PROGRAMMABLE ROBOT ABLE TO MANAGE THE FEEDING AND UNLOADING OF EMPTY SPOOLS AND FULL SPOOLS INTO AND FROM MACHINES USED FOR WINDING METAL WIRES EOD OTHER MATERIAL AT TWENTY OPERATING CHARACTERISTICS U GUALES OR DIFFERENT THAN ONE LONG THE SAME ROBOT YOU ARE LOOKING AT
US4723083A (en) * 1983-11-25 1988-02-02 General Electric Company Electrodeposited mica on coil bar connections and resulting products
US4724345A (en) 1983-11-25 1988-02-09 General Electric Company Electrodepositing mica on coil connections
GB2150153B (en) * 1983-11-25 1986-09-10 Gen Electric Electrodeposition of mica on coil or bar connections
US4622116A (en) * 1983-11-25 1986-11-11 General Electric Company Process for electrodepositing mica on coil or bar connections and resulting products
FR2556146B1 (en) 1983-12-05 1988-01-15 Paris & Du Rhone DEVICE FOR MOUNTING AND INSULATING CONDUCTORS ON ROTORS OF ELECTRIC ROTATING MACHINES
SE452823B (en) 1984-03-07 1987-12-14 Asea Ab Series capacitor EQUIPMENT
DE3444189A1 (en) 1984-03-21 1985-09-26 Kraftwerk Union AG, 4330 Mülheim DEVICE FOR INDIRECT GAS COOLING OF THE STATE DEVELOPMENT AND / OR FOR DIRECT GAS COOLING OF THE STATE SHEET PACKAGE OF DYNAMOELECTRICAL MACHINES, PREFERRED FOR GAS COOLED TURBOGENERATORS
US4488079A (en) 1984-03-30 1984-12-11 Westinghouse Electric Corp. Dynamoelectric machine with stator coil end turn support system
US4650924A (en) 1984-07-24 1987-03-17 Phelps Dodge Industries, Inc. Ribbon cable, method and apparatus, and electromagnetic device
US5066881A (en) 1984-08-23 1991-11-19 General Electric Company Semi-conducting layer for insulated electrical conductors
US5036165A (en) * 1984-08-23 1991-07-30 General Electric Co. Semi-conducting layer for insulated electrical conductors
US4853565A (en) * 1984-08-23 1989-08-01 General Electric Company Semi-conducting layer for insulated electrical conductors
US5067046A (en) 1984-08-23 1991-11-19 General Electric Company Electric charge bleed-off structure using pyrolyzed glass fiber
AU575681B2 (en) 1984-09-13 1988-08-04 Utdc Inc. Linear induction motor
US4560896A (en) 1984-10-01 1985-12-24 General Electric Company Composite slot insulation for dynamoelectric machine
DE3438747A1 (en) 1984-10-23 1986-04-24 Standard Elektrik Lorenz Ag, 7000 Stuttgart ELECTRONICALLY COMMUTED, COLLECTORLESS DC MOTOR
JPH0123900Y2 (en) 1984-11-08 1989-07-20
DE3441311A1 (en) 1984-11-12 1986-05-15 Siemens AG, 1000 Berlin und 8000 München SPLICE PROTECTOR INSERT FOR CABLE SLEEVES MADE OF SHRINKABLE MATERIAL
US4607183A (en) 1984-11-14 1986-08-19 General Electric Company Dynamoelectric machine slot wedges with abrasion resistant layer
JPS61121729A (en) 1984-11-14 1986-06-09 Fanuc Ltd Liquid cooled motor
EP0246377A1 (en) 1986-05-23 1987-11-25 Royal Melbourne Institute Of Technology Limited Electrically-variable inductor
DE3473698D1 (en) 1984-12-21 1988-09-29 Audi Ag Wire-feeding device for an insulated wire cutting and stripping apparatus
US4761602A (en) 1985-01-22 1988-08-02 Gregory Leibovich Compound short-circuit induction machine and method of its control
US4588916A (en) 1985-01-28 1986-05-13 General Motors Corporation End turn insulation for a dynamoelectric machine
US4868970A (en) 1985-03-08 1989-09-26 Kolimorgen Corporation Method of making an electric motor
EP0198535B1 (en) 1985-04-04 1990-02-07 Koninklijke Philips Electronics N.V. Composite wire for hf applications, coil wound from such a wire, and deflection unit comprising such a coil
US4618795A (en) 1985-04-10 1986-10-21 Westinghouse Electric Corp. Turbine generator stator end winding support assembly with decoupling from the core
US4654551A (en) * 1985-05-20 1987-03-31 Tecumseh Products Company Permanent magnet excited alternator compressor with brushless DC control
US4723104A (en) 1985-10-02 1988-02-02 Frederick Rohatyn Energy saving system for larger three phase induction motors
FR2589017B1 (en) 1985-10-17 1990-07-27 Alsthom SYNCHRONOUS MACHINE WITH SUPERCONDUCTING WINDINGS
DE3543106A1 (en) 1985-12-06 1987-06-11 Kabelmetal Electro Gmbh ELECTRIC CABLE FOR USE AS WINDING STRING FOR LINEAR MOTORS
US4656379A (en) * 1985-12-18 1987-04-07 The Garrett Corporation Hybrid excited generator with flux control of consequent-pole rotor
FR2594271A1 (en) 1986-02-13 1987-08-14 Paris & Du Rhone Rotor for electric rotating machine, with slots housing two overlying conductors
IT1190077B (en) 1986-02-28 1988-02-10 Pirelli Cavi Spa ELECTRIC CABLE WITH IMPROVED SCREEN AND PROCEDURE FOR THE CONSTRUCTION OF THIS SCREEN
US5403120A (en) 1986-03-31 1995-04-04 Nupipe, Inc. Method of installing a substantially rigid thermoplastic pipe in existing main and lateral conduits
US5244624B1 (en) 1986-03-31 1997-11-18 Nu Pipe Inc Method of installing a new pipe inside an existing conduit by progressive rounding
DE3612112A1 (en) 1986-04-10 1987-10-15 Siemens Ag Bracing for the teeth of the stator of a turbogenerator
US4687882A (en) 1986-04-28 1987-08-18 Stone Gregory C Surge attenuating cable
US4963695A (en) 1986-05-16 1990-10-16 Pirelli Cable Corporation Power cable with metallic shielding tape and water swellable powder
GB8617004D0 (en) 1986-07-11 1986-08-20 Bp Chem Int Ltd Polymer composition
JPS63110939A (en) 1986-10-25 1988-05-16 Hitachi Ltd Rotor of induction motor
JPH0687642B2 (en) 1986-12-15 1994-11-02 株式会社日立製作所 Rotor winding abnormality diagnosis device for rotating electric machine
US4924342A (en) 1987-01-27 1990-05-08 Teledyne Inet Low voltage transient current limiting circuit
EP0280759B1 (en) 1987-03-06 1993-10-13 Heinrich Dr. Groh Arrangement for electric energy cables for protection against explosions of gas and/or dust/air mixtures, especially for underground working
JPH07108074B2 (en) 1987-03-10 1995-11-15 株式会社三ツ葉電機製作所 Slot structure of rotor core in rotating electric machine
CA1258881A (en) 1987-04-15 1989-08-29 Leonard Bolduc Self-regulated transformer with gaps
US4771168A (en) 1987-05-04 1988-09-13 The University Of Southern California Light initiated high power electronic switch
SU1511810A1 (en) 1987-05-26 1989-09-30 Ленинградское Электромашиностроительное Объединение "Электросила" Им.С.М.Кирова Method of repairing laminated stator core of high-power electric machine
US4890040A (en) 1987-06-01 1989-12-26 Gundersen Martin A Optically triggered back-lighted thyratron network
US5012125A (en) 1987-06-03 1991-04-30 Norand Corporation Shielded electrical wire construction, and transformer utilizing the same for reduction of capacitive coupling
SE457792B (en) 1987-06-12 1989-01-30 Kabmatik Ab CABLE EXCHANGE DEVICE FOR APPLICATION FROM EXCHANGE FROM A FIRST ROTARY DRUM TO ANOTHER ROTARY DRUM
US4845308A (en) 1987-07-20 1989-07-04 The Babcock & Wilcox Company Superconducting electrical conductor
DE3726346A1 (en) 1987-08-07 1989-02-16 Vacuumschmelze Gmbh Annular core (ring core) for current sensors
US4800314A (en) 1987-08-24 1989-01-24 Westinghouse Electric Corp. Deep beam support arrangement for dynamoelectric machine stator coil end portions
US4801832A (en) 1987-11-04 1989-01-31 General Electric Company Stator and rotor lamination construction for a dynamo-electric machine
DE3737719A1 (en) 1987-11-06 1989-05-24 Thyssen Industrie METHOD AND DEVICE FOR INSERTING A WINDING IN THE INDUCTOR OF A LINEAR MOTOR
US4810919A (en) 1987-11-16 1989-03-07 Westinghouse Electric Corp. Low-torque nuts for stator core through-bolts
CA1318948C (en) 1987-11-18 1993-06-08 Takayuki Nimiya Cable closure
US4859989A (en) 1987-12-01 1989-08-22 W. L. Gore & Associates, Inc. Security system and signal carrying member thereof
US4994952A (en) 1988-02-10 1991-02-19 Electronics Research Group, Inc. Low-noise switching power supply having variable reluctance transformer
NL8800832A (en) 1988-03-31 1989-10-16 Lovink Terborg Bv METHOD FOR PROTECTING PROTECTION AGAINST MOISTURE-ENCLOSED ELEMENTS AND FILLING MASS USED IN THAT METHOD
US4914386A (en) 1988-04-28 1990-04-03 Abb Power Distribution Inc. Method and apparatus for providing thermal protection for large motors based on accurate calculations of slip dependent rotor resistance
US4864266A (en) 1988-04-29 1989-09-05 Electric Power Research Institute, Inc. High-voltage winding for core-form power transformers
DE3816652A1 (en) 1988-05-16 1989-11-30 Magnet Motor Gmbh ELECTRIC MACHINE WITH LIQUID COOLING
JPH0721078Y2 (en) 1988-07-21 1995-05-15 多摩川精機株式会社 Electric motor
CH677549A5 (en) 1988-08-02 1991-05-31 Asea Brown Boveri
US4847747A (en) 1988-09-26 1989-07-11 Westinghouse Electric Corp. Commutation circuit for load-commutated inverter induction motor drives
US5083360A (en) 1988-09-28 1992-01-28 Abb Power T&D Company, Inc. Method of making a repairable amorphous metal transformer joint
US4926079A (en) 1988-10-17 1990-05-15 Ryobi Motor Products Corp. Motor field winding with intermediate tap
GB2223877B (en) 1988-10-17 1993-05-19 Pirelli General Plc Extra-high-voltage power cable
JPH02179246A (en) 1988-12-28 1990-07-12 Fanuc Ltd Stator construction of built-in motor
US5168662A (en) 1988-12-28 1992-12-08 Fanuc Ltd. Process of structuring stator of built-in motor
US4982147A (en) 1989-01-30 1991-01-01 State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University Power factor motor control system
EP0410003B1 (en) 1989-02-14 1994-11-02 Sumitomo Electric Industries, Ltd. Insulated electric wire
US5136459A (en) 1989-03-13 1992-08-04 Electric Power Research Institute, Inc. High speed current limiting system responsive to symmetrical & asymmetrical currents
US4942326A (en) 1989-04-19 1990-07-17 Westinghouse Electric Corp. Biased securement system for end winding conductor
US5124607A (en) 1989-05-19 1992-06-23 General Electric Company Dynamoelectric machines including metal filled glass cloth slot closure wedges, and methods of making the same
JPH0351968A (en) 1989-07-19 1991-03-06 Toshiba Corp Linearization decision system
US4949001A (en) * 1989-07-21 1990-08-14 Campbell Steven R Partial discharge detection method and apparatus
DE3925337A1 (en) 1989-07-31 1991-02-07 Loher Ag Electric motor with housing accommodating stator surrounding rotor - has cooling ducts running axially so gaseous cooling medium under high pressure is fed in closed cooling circuit
SE465343B (en) * 1989-11-20 1991-08-26 Olof Magnus Lalander DEVICE FOR TRANSFORMATION OF HIGH ELECTRIC EFFECTS FROM A LICENSIVE LEVEL TO ANOTHER LICENSIVE LEVEL
US5355046A (en) 1989-12-15 1994-10-11 Klaus Weigelt Stator end-winding system and a retrofitting set for same
SE465240B (en) 1989-12-22 1991-08-12 Asea Brown Boveri OVERVOLTAGE PROTECTION FOR SERIAL CONDENSER EQUIPMENT
US5097241A (en) 1989-12-29 1992-03-17 Sundstrand Corporation Cooling apparatus for windings
YU48139B (en) 1990-01-25 1997-05-28 Branimir Jakovljević LAMINATED MAGNETIC core
EP0440865A1 (en) 1990-02-09 1991-08-14 Asea Brown Boveri Ab Electrical insulation
US5030813A (en) 1990-02-06 1991-07-09 Pulsair Anstalt Corporation Welding apparatus and transformer therefor
CA2010670C (en) 1990-02-22 1997-04-01 James H. Dymond Salient pole rotor for a dynamoelectric machine
TW215446B (en) 1990-02-23 1993-11-01 Furukawa Electric Co Ltd
US5171941A (en) 1990-03-30 1992-12-15 The Furukawa Electric Co., Ltd. Superconducting strand for alternating current
JP2814687B2 (en) 1990-04-24 1998-10-27 日立電線株式会社 Watertight rubber / plastic insulated cable
DE4022476A1 (en) 1990-07-14 1992-01-16 Thyssen Industrie Electric cable for three=phase AC winding of linear motor - covers one phase by inner conducting layer surrounded by insulation and outer conducting layer
DE4023903C1 (en) 1990-07-27 1991-11-07 Micafil Ag, Zuerich, Ch Planar insulator for electrical machine or appts. - is laminated construction withstanding high mechanical loading and with curved edges for fitting into grooves
NL9002005A (en) 1990-09-12 1992-04-01 Philips Nv TRANSFORMER.
DE4030236C2 (en) 1990-09-25 1999-01-07 Thyssen Industrie Device for removing the winding of a linear motor
US5111095A (en) 1990-11-28 1992-05-05 Magna Physics Corporation Polyphase switched reluctance motor
US5175396A (en) 1990-12-14 1992-12-29 Westinghouse Electric Corp. Low-electric stress insulating wall for high voltage coils having roebeled strands
DE4100135C1 (en) 1991-01-04 1992-05-14 Loher Ag, 8399 Ruhstorf, De
US5187428A (en) 1991-02-26 1993-02-16 Miller Electric Mfg. Co. Shunt coil controlled transformer
ES2025518A6 (en) 1991-03-08 1992-03-16 Huarte Frances Domingo Rotary electromechanical arrangements.
US5153460A (en) 1991-03-25 1992-10-06 The United States Of America As Represented By The Secretary Of The Army Triggering technique for multi-electrode spark gap switch
DE4112161C2 (en) 1991-04-13 1994-11-24 Fraunhofer Ges Forschung Gas discharge device
FR2677802B1 (en) 1991-06-14 1994-09-09 Alsthom Gec ELECTRIC WINDING AND ITS WINDING METHOD.
US5246783A (en) 1991-08-15 1993-09-21 Exxon Chemical Patents Inc. Electrical devices comprising polymeric insulating or semiconducting members
SE469361B (en) 1991-11-04 1993-06-21 Asea Brown Boveri PROCEDURE AND DEVICE FOR REDUCTION OF DIFFICULTIES IN THE POWER
US5499178A (en) 1991-12-16 1996-03-12 Regents Of The University Of Minnesota System for reducing harmonics by harmonic current injection
US5264778A (en) 1991-12-31 1993-11-23 Westinghouse Electric Corp. Apparatus protecting a synchronous machine from under excitation
CA2086897A1 (en) 1992-01-13 1993-07-14 Howard H. Bobry Toroidal transformer and method for making
US5343139A (en) 1992-01-31 1994-08-30 Westinghouse Electric Corporation Generalized fast, power flow controller
US5235488A (en) 1992-02-05 1993-08-10 Brett Products, Inc. Wire wound core
US5327637A (en) 1992-02-07 1994-07-12 Kabelmetal Electro Gmbh Process for repairing the winding of an electrical linear drive
JP3135338B2 (en) 1992-02-21 2001-02-13 株式会社日立製作所 Commutation type DC circuit breaker
US5598137A (en) 1992-03-05 1997-01-28 Siemens Aktiengesellschaft Coil for high-voltage transformer
JP3245748B2 (en) 1992-03-09 2002-01-15 久光製薬株式会社 P-menthane derivative and cooling sensate containing the same
JPH05328681A (en) 1992-05-18 1993-12-10 Mitsuba Electric Mfg Co Ltd Coating material for armature core in motor of electrical equipment
DE4218969A1 (en) 1992-06-10 1993-12-16 Asea Brown Boveri Process for fixing winding heads of electrical machines and means for carrying out the process
FR2692693A1 (en) 1992-06-23 1993-12-24 Smh Management Services Ag Control device of an asynchronous motor
GB2268337B (en) 1992-07-01 1996-06-05 Gec Alsthom Ltd Electrical machine slot wedging system
US5304883A (en) 1992-09-03 1994-04-19 Alliedsignal Inc Ring wound stator having variable cross section conductors
AT399790B (en) 1992-09-10 1995-07-25 Elin Energieversorgung HIGH VOLTAGE WINDING
DE4233558C2 (en) 1992-09-30 1995-07-20 Siemens Ag Electrical machine
ATE150204T1 (en) 1992-11-05 1997-03-15 Gec Alsthom T & D Sa SUPERCONDUCTIVE WINDING, ESPECIALLY FOR CURRENT LIMITERS AND CURRENT LIMITERS WITH SUCH A WINDING
US5325008A (en) 1992-12-09 1994-06-28 General Electric Company Constrained ripple spring assembly with debondable adhesive and methods of installation
GB9226925D0 (en) 1992-12-24 1993-02-17 Anglia Electronic Tech Ltd Transformer winding
US5449861A (en) 1993-02-24 1995-09-12 Vazaki Corporation Wire for press-connecting terminal and method of producing the conductive wire
EP0620630A1 (en) 1993-03-26 1994-10-19 Ngk Insulators, Ltd. Superconducting fault current limiter
EP0620570B1 (en) 1993-03-26 1997-02-12 Ngk Insulators, Ltd. Superconducting fault current limiter
US5399941A (en) 1993-05-03 1995-03-21 The United States Of America As Represented By The Secretary Of The Navy Optical pseudospark switch
US5455551A (en) * 1993-05-11 1995-10-03 Abb Power T&D Company Inc. Integrated temperature sensing duct spacer unit and method of forming
US5341281A (en) 1993-05-14 1994-08-23 Allen-Bradley Company, Inc. Harmonic compensator using low leakage reactance transformer
US5365132A (en) 1993-05-27 1994-11-15 General Electric Company Lamination for a dynamoelectric machine with improved cooling capacity
JP3355700B2 (en) 1993-06-14 2002-12-09 松下電器産業株式会社 Rotating electric machine stator
FR2707448B1 (en) 1993-07-06 1995-09-15 Cableco Sa Power generator for an arc lamp.
US5321308A (en) 1993-07-14 1994-06-14 Tri-Sen Systems Inc. Control method and apparatus for a turbine generator
US5545853A (en) 1993-07-19 1996-08-13 Champlain Cable Corporation Surge-protected cable
FR2708157B1 (en) 1993-07-22 1995-09-08 Valeo Equip Electr Moteur Element of a rotating machine and motor vehicle starter comprising such an element.
DE4329382A1 (en) 1993-09-01 1995-03-02 Abb Management Ag Method and device for detecting earth faults on the conductors of an electrical machine
GB2283133B (en) 1993-10-20 1998-04-15 Gen Electric Dynamoelectric machine and method for manufacturing same
SE502417C2 (en) 1993-12-29 1995-10-16 Skaltek Ab Control device for unrolling or unrolling a string, eg a cable on or from a drum
DE4402184C2 (en) 1994-01-26 1995-11-23 Friedrich Prof Dr Ing Klinger Multi-pole synchronous generator for gearless horizontal-axis wind turbines with nominal powers of up to several megawatts
JP3468817B2 (en) 1994-02-25 2003-11-17 株式会社東芝 Field ground fault detector
DE4409794C1 (en) 1994-03-22 1995-08-24 Vem Elektroantriebe Gmbh Fastening for equalising connection lines of high-power DC machines
US5530307A (en) 1994-03-28 1996-06-25 Emerson Electric Co. Flux controlled permanent magnet dynamo-electric machine
DE4412412C2 (en) 1994-04-11 1996-03-28 Siemens Ag Locomotive transformer and winding arrangement for this
DE4412761C2 (en) 1994-04-13 1997-04-10 Siemens Ag Conductor feedthrough for an AC device with superconductivity
JP3623269B2 (en) 1994-04-15 2005-02-23 コールモージェン・コーポレーション Axial air gap motor
US5500632A (en) 1994-05-11 1996-03-19 Halser, Iii; Joseph G. Wide band audio transformer with multifilar winding
GB2289992B (en) 1994-05-24 1998-05-20 Gec Alsthom Ltd Improvements in or relating to cooling arrangements in rotating electrical machines
FI942447A0 (en) 1994-05-26 1994-05-26 Abb Stroemberg Kojeet Oy Foerfarande Foer eliminering av stoerningar i ett elkraftoeverfoeringsnaet samt koppling i ett elkraftoeverfoeringsnaet
DE4420322C2 (en) 1994-06-13 1997-02-27 Dresden Ev Inst Festkoerper YBa¶2¶Cu¶3¶O¶X¶ high-temperature superconductor and method for its production
IT1266896B1 (en) 1994-07-27 1997-01-21 Magneti Marelli Spa ROTOR OF AN ELECTRIC MACHINE, IN PARTICULAR OF AN ELECTRIC MOTOR FOR STARTING THE INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE AND
US5550410A (en) * 1994-08-02 1996-08-27 Titus; Charles H. Gas turbine electrical power generation scheme utilizing remotely located fuel sites
US5612510A (en) 1994-10-11 1997-03-18 Champlain Cable Corporation High-voltage automobile and appliance cable
DE4438186A1 (en) 1994-10-26 1996-05-02 Abb Management Ag Operation of sync electrical machine mechanically coupled to gas-turbine
US5533658A (en) 1994-11-10 1996-07-09 Production Tube, Inc. Apparatus having replaceable shoes for positioning and gripping tubing
US5510942A (en) 1994-12-19 1996-04-23 General Electric Company Series-capacitor compensation equipment
CA2167479C (en) 1995-01-17 2006-04-11 Andrew J. O'neill Forced encapsulation cable splice enclosure including a container for existing encapsulant
DE59604144D1 (en) * 1995-02-21 2000-02-17 Siemens Ag Hybrid excited electrical machine
GB9507391D0 (en) 1995-04-10 1995-05-31 Switched Reluctance Drives Ltd Method and apparatus for reducing winding failures in switched reluctance machines
CA2170686A1 (en) 1995-04-21 1996-10-22 Mark A. Runkle Interconnection system for electrical systems having differing electrical characteristic
US5742515A (en) 1995-04-21 1998-04-21 General Electric Co. Asynchronous conversion method and apparatus for use with variable speed turbine hydroelectric generation
DE19515003C2 (en) 1995-04-24 1997-04-17 Asea Brown Boveri Superconducting coil
US5663605A (en) * 1995-05-03 1997-09-02 Ford Motor Company Rotating electrical machine with electromagnetic and permanent magnet excitation
JPH08340661A (en) 1995-06-13 1996-12-24 Matsushita Electric Ind Co Ltd Recycling method of resin-molded rotating electric machine and molding resin
US5691589A (en) 1995-06-30 1997-11-25 Kaman Electromagnetics Corporation Detachable magnet carrier for permanent magnet motor
US5607320A (en) 1995-09-28 1997-03-04 Osram Sylvania Inc. Cable clamp apparatus
DE19547229A1 (en) 1995-12-18 1997-06-19 Asea Brown Boveri Packing strips for large rotary electrical machine stator winding
GB2308490A (en) 1995-12-18 1997-06-25 Oxford Instr Ltd Superconductor and energy storage device
IT1281651B1 (en) 1995-12-21 1998-02-20 Pirelli Cavi S P A Ora Pirelli TERMINAL FOR CONNECTING A SUPERCONDUCTIVE POLYPHASE CABLE TO A ROOM TEMPERATURE ELECTRICAL SYSTEM
FR2745117B1 (en) 1996-02-21 2000-10-13 Whitaker Corp FLEXIBLE AND FLEXIBLE CABLE WITH SPACED PROPELLERS
EP0802542B1 (en) 1996-03-20 2002-01-02 NKT Cables A/S A high-voltage cable
DE19620906C2 (en) 1996-05-24 2000-02-10 Siemens Ag Wind farm
US5807447A (en) 1996-10-16 1998-09-15 Hendrix Wire & Cable, Inc. Neutral conductor grounding system
DE19747968A1 (en) 1997-10-30 1999-05-06 Abb Patent Gmbh Process for repairing laminated cores of an electrical machine
GB2332557A (en) 1997-11-28 1999-06-23 Asea Brown Boveri Electrical power conducting means

Also Published As

Publication number Publication date
OA11018A (en) 2001-11-07
NO985581D0 (en) 1998-11-27
CN1226347A (en) 1999-08-18
IL127316A (en) 2001-05-20
SK164098A3 (en) 1999-06-11
AP9801404A0 (en) 1998-12-31
BR9709489A (en) 1999-08-10
YU54498A (en) 2001-03-07
CN1225743A (en) 1999-08-11
JP3051905B2 (en) 2000-06-12
IS1798B (en) 2001-12-31
BG63442B1 (en) 2002-01-31
NO985583D0 (en) 1998-11-27
US20020047268A1 (en) 2002-04-25
PL330234A1 (en) 1999-05-10
JP2000515357A (en) 2000-11-14
DE19781786T1 (en) 1999-09-30
AR007337A1 (en) 1999-10-27
IL127098A0 (en) 1999-09-22
AP9801408A0 (en) 1998-12-31
WO1997045921A2 (en) 1997-12-04
AP9801398A0 (en) 1998-12-31
KR100382963B1 (en) 2003-08-14
TR199802465T2 (en) 2000-08-21
KR20000016122A (en) 2000-03-25
WO1997045921A3 (en) 1998-01-22
ID19546A (en) 1998-07-23
US6940380B1 (en) 2005-09-06
CN1225753A (en) 1999-08-11
CO4600012A1 (en) 1998-05-08
NO985583L (en) 1999-01-28
EA000993B1 (en) 2000-08-28
CA2256535A1 (en) 1997-12-04
EA199801071A1 (en) 1999-04-29
IL127307A0 (en) 1999-09-22
EP0906651A2 (en) 1999-04-07
CA2256469A1 (en) 1997-12-04
PE67998A1 (en) 1998-11-14
SK164198A3 (en) 1999-07-12
ID19692A (en) 1998-07-30
NO985499L (en) 1998-11-25
AU714564B2 (en) 2000-01-06
TW443024B (en) 2001-06-23
US20020063487A1 (en) 2002-05-30
BG63413B1 (en) 2001-12-29
NO985582D0 (en) 1998-11-27
AU3052397A (en) 1998-01-05
BG103009A (en) 1999-06-30
EA199801048A1 (en) 1999-08-26
AU2988497A (en) 1998-01-05
ATE261203T1 (en) 2004-03-15
CN1257593C (en) 2006-05-24
OA10927A (en) 2003-02-21
ATE266244T1 (en) 2004-05-15
IL127316A0 (en) 1999-09-22
AU729780B2 (en) 2001-02-08
NO985581L (en) 1999-01-28
IS4896A (en) 1998-11-17
JP2000511387A (en) 2000-08-29
CN1220026A (en) 1999-06-16
CZ387998A3 (en) 1999-02-17
EA001488B1 (en) 2001-04-23
NZ333017A (en) 2000-09-29
EE03461B1 (en) 2001-06-15
EP0888662A2 (en) 1999-01-07
AU731065B2 (en) 2001-03-22
PE73398A1 (en) 1998-11-30
CA2256347A1 (en) 1997-12-04
DE69727917D1 (en) 2004-04-08
BR9709385A (en) 1999-08-10
EP0888662B1 (en) 2004-03-03
KR20000016123A (en) 2000-03-25
PL330216A1 (en) 1999-05-10
BG102964A (en) 1999-05-31
TR199802474T2 (en) 1999-03-22
CO4600011A1 (en) 1998-05-08
NZ333014A (en) 2000-08-25
NO985499D0 (en) 1998-11-25
WO1997045847A1 (en) 1997-12-04
DE69728972T2 (en) 2005-05-04
AU718706B2 (en) 2000-04-20
JP2000511349A (en) 2000-08-29
US6822363B2 (en) 2004-11-23
GEP20022779B (en) 2002-08-26
AU2987597A (en) 1998-01-05
NZ333016A (en) 2000-05-26
TR199802479T2 (en) 2000-08-21
EA199801072A1 (en) 1999-06-24
PL185200B1 (en) 2003-03-31
IS4903A (en) 1998-11-20
AU3052197A (en) 1998-01-05
DE69728972D1 (en) 2004-06-09
TW366503B (en) 1999-08-11
NO985582L (en) 1999-01-28
CZ386898A3 (en) 1999-02-17
IS4895A (en) 1998-11-17
BR9709391A (en) 1999-08-10
EP0888628B1 (en) 2004-05-06
PL182736B1 (en) 2002-02-28
WO1997045907A3 (en) 1998-01-15
AP843A (en) 2000-06-07
EA001181B1 (en) 2000-10-30
PL330288A1 (en) 1999-05-10
KR20000016121A (en) 2000-03-25
AP1083A (en) 2002-07-23
CO4650244A1 (en) 1998-09-03
EA001096B1 (en) 2000-10-30
AR007341A1 (en) 1999-10-27
CO4600757A1 (en) 1998-05-08
CN1158680C (en) 2004-07-21
WO1997045848A1 (en) 1997-12-04
AP936A (en) 2001-02-07
BG63415B1 (en) 2001-12-29
WO1997045907A2 (en) 1997-12-04
EP0888627A1 (en) 1999-01-07
CZ388198A3 (en) 1999-03-17
EP0888628A1 (en) 1999-01-07
PL330800A1 (en) 1999-06-07
EA199801073A1 (en) 1999-04-29
DE69727917T2 (en) 2005-01-27
JPH11514151A (en) 1999-11-30
NZ333600A (en) 2000-09-29
UA44857C2 (en) 2002-03-15
BG102944A (en) 1999-07-30
AR007342A1 (en) 1999-10-27
ID18779A (en) 1998-05-07
CN1105413C (en) 2003-04-09
EE9800410A (en) 1999-06-15
PE73098A1 (en) 1998-11-23
TR199802475T2 (en) 1999-03-22

Similar Documents

Publication Publication Date Title
AP843A (en) A DC transformer/reactor.
US20010019494A1 (en) Dc transformer/reactor
EP1016103B1 (en) Power transformer/inductor
CA2275619A1 (en) Device and method relating to protection of an object against over-currents comprising over-current reduction and current limitation
WO1998027636A1 (en) Device and method relating to protection of an object against over-currents comprising over-current reduction
KR20000016097A (en) Direct current transformer and reactor
CA2311748A1 (en) Switch gear station
MXPA98009865A (en) Transformer / reac
SE513493C2 (en) Power transformer and reactor with windings with conductors
MXPA99005677A (en) Device and method relating to protection of an object against over-currents comprising over-current reduction and current limitation
SE508556C2 (en) Power transformer and reactor with windings with conductors

Legal Events

Date Code Title Description
FZDE Discontinued