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Publication numberUS1903956 A
Publication typeGrant
Publication dateApr 18, 1933
Filing dateMar 14, 1932
Priority dateApr 17, 1931
Publication numberUS 1903956 A, US 1903956A, US-A-1903956, US1903956 A, US1903956A
InventorsFoster Amer Donald, John Christie
Original AssigneeReyrolle A & Co Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
High voltage electric switch gear
US 1903956 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

Apml 1,8, i933. CHRSTIE ET AL 1,903,956

HIGH VOLTAGE ELECTRIC SWITCH GEAR Filed March 14, 1932 3 Sheets-Sheet l April 18, 1933.

J. CHRISTIE ET AL HIGH VOLTAGE ELECTRIC SWITCH GEAR Filed March 14, 1932 3 Sheets-Sheet 2 JJM April 18, 1933.

J. CHRISTIE ET AL HIGH VOLTAGE ELECTRIC SWITCH GEAR Filed March 14, 1932 3 Sheets-Sheet 3 Patented Apr. 18, 1933 UNITED STATES PATENT OFFICE JOHN CHRISTIE, OF SUNDERLAND, AND DONALD FOSTER AMER, OF JARROW, ENGLAND, ASSIGNORS TO A. REYROLLE & COMPANY LIMITED, OF HEBBURN-ON-TYNE, ENGLAND, A REGISTERED COMPANY F GREAT BRITAIN HIGH VOLTAGE ELECTRIC SWITCH GEAR Application led March 14, 1932, Serial No. 598,836, and in Great Britain April 17, 1931.

This invention relates to high voltage electric switch gear and has particular reference to the mounting of potential transformer fuses in such gear. As is well known such fuses are employed to protect the primary circuits of the potential transformer, and it is customary to mount the fuses in separate oil filled tanks rinto which the connections from the potential transformer are led through plug and socket isolating contacts. In some instances isolation has also been effected by withdrawing the fuse from its mounting.

The present invention has for its object to provide an improved mounting for a potential transformer fuse which renders unnecessary the provision of a special tank for the fuse and thereby enables considerable econonly to be effected both in space and in cost.

A convenient practical arrangement of fuse mounting according to the invention, as applied to A. C. switchgear wherein a singlephase potential transformer is provided in each phase in association with an oil-immersed circuit-breaker for connecting a feeder circuit to a busbar, is illustrated by way of example in the accompanying drawings, in which Figure l shows a general View of a portion of the switch gear partly in section to show the mechanism between the circuitbreaker and the potential transformer,

Figure 2 shows the potential transformer fuse and its mounting in vertical section on a larger scale,

Figures 3 and 4 also on a larger scale show respectively in side elevation and in plan part of the mechanism at the top of the fuse mounting, and

Figure 5 is a view similar to part of Figure 1 illustrating a modified formv of fuse mounting according to the invention. y

In the arrangement of Figures 1-4 two oilfilled chambers are provided above the circuit-breaker tank A, into which the busbar and the feeder B are respectively introduced. The busbar chamber is not shown in the drawings since it forms no part of the present invention, but may be arranged for example in the manner described. in the present applicants prior U. S. patent applica'- tion Serial No. 508,988, wherein the busbar is connected to one of the main circuit-breaker contacts through an isolating switch in the busbar chamber and through an insulated conductor normally projecting into the circuit-breaker tank but withdrawably mounted in an insulating tube passing through the busbar chamber. The other main circuitbreaker contact is similarly connected through a withdrawable conductor to a contact on an insulating tube C1 passing through the feeder chamber C. This contact is connected to a metal lug C2 to which an isolating switch blade Dis pivoted. This isolating switch blade D cooperates with a contact member B1 connected to the feeder B and also with an earthed Contact D1.

The feeder chamber C extends over the potential transformer tank E, which is disposed by the side of the circuit-breaker tank A, and has an orifice in its bottom wall vertically above a corresponding orifice in the cover plate E1 of the potential transformer tank E. The two orifices are connected by a short trunk E2, within which is mounted a condenser type bushing insulator F of usual construction, the length of the bushing being approximately the same as that of the potential transformer fuse G itself. The outermost layer of the bushing F is connected to earth through the metal wall of the trunk E2, and the innermostlayer is formed by a metal tube H whose lower end projects a short distance beyond the bushing and carries a metal cap H1 to which the primary winding of the potential transformer is connected.

Closely fitting within the tube H and extending from the metal vcap H1 right up to an orifice J in the top of the feeder chamber C is an insulating tube K formed of layers of impregnated paper. This tube K is lined in its lower part with further layers K1 of paper insulation extending approximately to the same height as the surrounding metal tube H, and in its upper part with a second metal tube K2 resting on top of such paper insulation K1 and extending nearly to the top ofthe insulating tube K. Metal conducting layers K1 are interleaved with the paper lay- 100 CII ers of the insulatingtube in the neighbourhood of the upper end of the outer metal tube H and the lower end of the second metal tube K2.

The potential transformer fuse G itself is of the high resistance dust-lilled type and is inserted withinfthese tubes so that in its operative position its lower metal base rests on the metal cap H1 and is thus electrically connected tothepotential transformer primary winding andto-tliemetal 'tube'Il-I forming thev innermost layer of the bushing F, whilst its upper terminal is provided with spring contacts G1 or spring pressed plungers engaging with the vsecond metal tube K2. The fuseis carriedl on an insulating handle G2 extend'- ing to the top oftheA insulating tube K, so

vthat the fuse can beireadily withdrawn by .the handle from its mounting. The upper endv of the. insulating tube K is normally closedby a metal cap J1 which may press on the upper end of thehandle G2 and thus hold .the fuse securely in' place. Y The space within the tube K surrounding the fuse G is preferably oil-filled'. c i Y f Theysecond metal tube K2 near its upper endis connected through the wall ofthe insulating tube K to a metal lug K4 to which is'pivoted. anv isolating'switch blade L. This blade L cooperates with the Contact member B1 connected tothey feeder B and also with an earthed contact L1 mounted in a suitable po- 'sition in the feeder chamber C. This arrangement enables the second metal tube K2 and thereforeV also the fuse G to be earthed so'that the fuse can be withdrawn, when desired, with absolute safety. In order that the operator may readilyv see that the isolating switch .L isv in rits earthed position before withdrawing theV fuse, an indicator maybe providedV outside the wall of the feederr cham` ber. This: indicator may conveniently bel actuated by a flexible bellowsin the wall of the chamber, Vthis bellows being operated by movement oftheisolating switch blade Lfi'nto the-earthed position'. SuchV an indicating arrangement is incorporated in the modified form of fuse mounting shown in Figure 5 and will be described later with reference toY that figure'f i f If desired,the metal cap J1 closing the top ofthe insulating tube K may be mechanicallyY interlocked with ytheoperating mechanism for the isolating switch L, whereby removal of the .capv is prevented unless the isolating switch is in its earthed position. Thusin one convenient arrangement the metal Ycap J1 is mounted at one side on a pivot pin J2 which is kcarried in suitable bearings AM on thetop of thefeeder chamber C so that it Y ,canl rotate therein'andy can also slide longi-A tudinally for a short distance.

In vthe normalpositionwith the cap J1 closed, a projection J 3 on the side ofthe pivot pin J2 abuts closely" against a" stop M1 4on the top of the i? chamberso that yit is impossible torotate the pin J2 to open the cap J1 without first sliding the pin longitudinally until the projection J 2 is clear of the stop M1. The operating mechanism for the isolating switch L is provided with a segmental plate Nrwhich, when the isolating switch` is closedlies beyond the end of the pivot pin J2 and prevents longitudinal movement thereof. Movement ofthe isolating switch into its earthedlA position causes the segmental plate N' to move out of the path of the pivot pin. Thus the metal cap J1 cannot be opened, when the isolating switch L is closed, but when the switch is earthed the capcan be openedl by sliding and then rotating the'pivot pin J2. The cap vJ1 is preferably bolted in its normal position, the bolts having first to be removed before the cap can be opened. It will be noted that when the cap is open, thek pivot pin J2 lies in the path of the segmental plate N and thus prevents movement of the isolating switch L into the closed position.

Thus the fuse G when in its operative po,- sitfon constitutespart of the connection from the potential transformer primary winding through the isolating switchL to theV feeder B and is directlyr mounted within, the te-rminal bushing F of the potential transformer. The use of a condenser type bushing prevents corona discharge from thethin wire of the fuse and the insulating tube K serves to prevent the two ends of the fuse from being virtually short-circuited, as they would otherwise be, bythe innermost layer of the condenser bushing. The condenser layers K3 act to grade-the stress set up when the fuse blows betweenA the lower end'of the metal tube K2 and the upper vend of the metal tube H which is at the potential of the lower end o f the fuse. l

An alternativeV form vof mounting for the fuse is -illu-stratedin Figure 5, which shows only those rparts of the arrangement which differ from the arrangement of Figures 1 4. In this modification the fuse G is as before mounted within an insulating tube K which extends through the feeder chamber C coaXially with the condenser bushing F inthe trunk E2 connecting the feeder chamber with the potential transformer tank E, but in this instance the condenser bushing F is of the usual construction with a central rod-like conductor terminating at its upper end in a metal cap Fl on which the lower end of the fuse G rests, the insulating tubeK at its lower end surrounding thefupper part of the condenser bushing F instead of being mounted within it.V The upper end of the insulating tube K is arranged in the same manner as in the arrangement of Figures l-4.

l/Vhen the fuse G is of the liquid-filled type. a limiting resistance O is mounted lon top of` the fuse with its lower end attached to the c upper terminal of the fuse, so that the limiting resistance is in series with the fuse. f The resistance O and the fuse G thus together constitute a unit which can be withdrawnas a whole through the upper end of the tube K by means of the insulating handle G2 as in the arrangement of Figures 1-4. The limiting resistance O may be omitted when the fuse is of the high resistance dust-filled type.

The upper end of the limiting resistance O (or of the fuse G as the case may be) is provided with spring contacts or spring- Apressed plungers O1 engaging with a conducting member K5 connected through the lwall of the insulating tube K to a metal lug through the wall of the chamber C and carrying a plate P1 pressed by a spring PL towards the chamber wall, an oil-tight joint being ensured by the provision of a flexible Vbellows P3 connecting the plate P1 to the chamber wall. is connected to a lever Q which serves to actuate an indicator of suitable construction whereby the operator can readily see whether or not the fuse is earthed before withdrawing the fuse. In the example illustrated the lever Q, carries a plate Q1 bearing suitable legends such as On and Off which are selectively eXposed to View through a window Q2 in accordance with the position of the 40 `isolating switch blade L.

arrangement, metal conducting layers of short length are interleaved with the paper layers to grade the stress set up when the fuse blows between` conducting members connected to the upper and lower ends of the fuse. In this instance the conducting layers KG surround the fuse G itself, the innermost layer being disposed around the lower end of the fuse and the outermost layer around the upper end of the fuse, whilst the intervening layers overlap one another in a steplike formation. These layers thus grade the stress between the conducting member K connected to the isolating switch contact andthe metal cap F1 on the centralconductor within the condenser bushing F, and thereby eliminate'or minimize risk of a flash-over betweeny these conducting members.V Although the potential transformer primary winding may be earthed in kthe usual manner so that the metal cap Fl at the lower end of the fuse is at earth potential, it may sometimes be preferable to operate the transformer'withl out cai-thing one of its windings.V

The outer end of the rod P1 for high voltage electric switchgear, comp It will be-seen that either of the above arrangements provides a convenient and compact mounting for the fuse, without the necessity for a separate containing tank, and is adequately safeguarded against disruptive discharges.

The arrangements described have been given by way of example only and may be modified in variousways within the scope of the invention. Thus for instance the fuse in the arrangement of Figures 1-4 may be of the liquid-filled type, in which case a limit- -ing resistance would be mounted inseries with and on` top of the fuse in the manner described with reference to Figure 5.

` What we claim as our invention and desire to secure by Letters Patent is 1 l. A potential transformer fuse mounting for high voltage electric switchgear, comprising a potential `transformer tank, a condenser-type bushing insulator which supports thefuse mounting in the wall ofthe tank, a metal tube constituting the innermost layer of the bushing insulator, a potential transformer fuse disposed within the bushing insulator, and an insulatingtube surrounding the fuse and surrounded by the metal tube. v

2. A potential transformer fuse mounting prising a potential transformer tank, a condenser-type bushing insulator which supports the fuse mounting in the wall of the tank, a metal tube constituting the innermost layer of the bushing insulator, a potential transformer fuse disposed within the bushing insulator, an insulating tube-surrounding the fuse and surrounded by the metal tube, and an electrical connection between the lower end'of the fuse within Vthe transformer tank and the metal tube.

3. A potential transformer fuse mounting for high voltage electric switchgear, comprising a potential transformer tank, a condenser-type bushing insulator which supports the fuse mounting in the wall of the tank, a. metal tube constituting the innermost layer of the bushing insulator, a potential transformer fuse disposed within the bushing insulator, an insulating tube surrounding the fuse and surrounded by the metal tube, and means whereby the fuse can be withdrawn through the upper end of the insulating tube for isolating purposes.

4. A potential transformer fuse mounting for high voltage electric switchgear, comprising a potential transformer tank, a condenser-type bushing insulator which supports the fuse mounting in the wall of the tank, a metal tube constituting theinnermost layer of the bushing insulator, a potential transformer fuse disposed within the bushing insulator, an insulating vtube surrounding the fusev and surrounded by Lthe metal tube, a second metal tube mounted within the insulating tube and electrically connected at its lower end to the upper end of the fuse, and an externalelectric circuit to which the second metal tube is connected.

5;v A potential transformer fuse mounting for high voltage electric switchgear, comprising a potential transformer tank, a condenser-type bushing insulator which sup- V ports the fuse mounting in the wall of the tank, a metal tube constituting the innermost layer of the bushing insulator, a potential transformerfuse disposed within the .bushing insulator, an insulating tube sur-V rounding the` fuse and surrounded by the metal tube, a second metal tube mounted within the insulating tube and electrically connected at its lower end to the upper end ofthe fuse, a Contact formed on the second metal tube constituting a terminal for con- --nection to an external electric circuit, and an electrical connection between the lower end of the fuse within the transformer tank lmost layer of the bushing insulator, a potential transformer fuse disposed within the bushingV insulator, an insulating tube surrounding the fuse and surrounded by the `metal tube, such insulating tube being formed of layers of insulating material, an electrical connection between the lower end of thefuse within the transformer tank and the metal tube, and Vconducting layers interleaved with the insulating layers of the insulating tube 'between the upper ends of the n fuse and of the metal tube.V -f

f 7.y A potential transformer fuse mounting for high .voltage electric switchgear, coniprising a potential transformer tank a condenser-type bushing insulator' which supports the fuse mounting in the wall ofthe tank, a .metal tube constituting the innermost layer of the bushing insulator, a 'p0- tential 'transformer fuse disposed within the .bushing insulator, 'an insulating tube surrounding the fuse fand surrounded by the metal tube, such insulating tube being formed of layers vof insulating material, a second metal tube mounted within the insulatingtube with its lower' end inV electrical connection with the upper end of the fuse, an external electric'circuit to which the second metal tube'islconnected, an electrical connection between the lower end of the fuse within the transformer tank and the first metal'tube, and overlapping conducting layersof short length interleaved with the insu# lating layers of the insulating tube between the lower end of the second metal tube and the upper end of the first metalrtube.

8. A potential transformer fuse mounting for high voltage electric switchgear, comprising a potential transformerV tank, ,a condenser-type .bushing insulator in the wall thereof, a conductor within the bushing in'- slator connected to the potential transformer primary winding, -an insulating tube formed of layers of insulating material and disposed coaXially withthe bushing insulator, a potential transformer fuse mounted within such insulating tube', and overlapping conducting layers fof short length interleaved with the insulating layers of such tube and acting to grade the stress set up whenrthe fuse has blown between conducting members connected to the two ends of the fuse.

'r 9. A potential transformer fuse mounting for'high voltage electric switchgear, comprising a potential transformer fuse, aninsulating tube formed of Ylayers of insulating material'surrounding the potential transformer fuse, overlapping conducting layers of short length interleaved with the insulating :layers of such tube and acting to grade thestress set up whenthe fuse has blown between conducting membersconnected to the two ends of thefuse, and means whereby the fuse can beV withdrawn through the upper end of the insulating tube for isolating purposes.` i

10'.. A potential transformer fuse mounting for high voltage electric switchgear, comprising a potential transformer tank, a condenserl type bushing insulator which supports the 4fuse mounting in the wall of the tank, a'metal tube constituting the innermost layer of the bushing insulator, a potential transformer fuse disposed within Athe bushing insulator,

an insulating tube surrounding the fuse and surrounded by the metal tube, a limiting resistance connected in series withthe fuse and mounted on the upper end thereof, and means y whereby the fuse can be withdrawn together with the limiting resistance through the-upper end of the' insulating tube for isolating purposes.

11. A potential transformer-fuse mounting f for high voltage electric switchgear, comprisl' ing a potential transformer tank, a condensertype bushing insulator in the wall thereof, a conductorwithin the bushinginsulator connected to the potential transformerv primary winding, an insulating tube formed of layers of insulating material and disposedA coa'Xially with ther bushing insulator, a potential transformer fuse mounted within such insulating tube with its lower end connected :to theupper end of the conductor within the bushing insulator, a rContact on the insulating tube constituting a terminal for connection to' an external circuit, alimiting resistance mounted with its upper end connected to such contact and its lower end in `contactvwith the upper end of the fuse, means whereby the fuse can be withdrawn together with the limiting resistance through the upper end of the insulating tube for isolating purposes, and overlapping conducting layers of short length interleaved with the insulating layers of the insulating tube and acting to grade the stress set up when the fuse has blown between the lovgr end of the fuse and the contact on the tu 12. The combination with the features set forth in claim 1, of a chamber which is disposed above the potential transformer tank and through which the insulating tube passes, a contact on the insulating tube to which the upper end of the fuse is connected, a contact in the chamber connected to an external electric circuit, a contact in the chamber connect* ed to earth, and an isolating switch in the chamber which can be moved to connect the contact on the insulating tube either to the circuit contact or to the earthed contact.

13. The combination with the features set forth in claim 1. of a circuit-breaker tank di sposed by the side of the potential transformer tank, a circuit-breaker immersed in oil therein, a chamber which is disposed above the two tanks and through which the insulating tube passes, a conductor leading from one of the contacts of the circuit-breaker into the chamber, a contact in the chamber connected to an external circuit, an isolating switch controlling the connection between such contact and the conductor leading to the circuitbreaker, a contact on the insulating tube to which the upper end of the fuse is connected, and a second isolating switch in the chamber' controlling the connection between such contact and the contact connected to the external circuit.

14. The combination with the features set forth in claim 5, of a chamber which is disposed above the potential transformer tank and through which the insulating tube passes, a contact in the chamber connected to the external electric circuit, a contact in the chamber connected to earth, and an isolating switch in the chamber which can be moved to connect the contact on the second metal tube either to the circuit contact or to the earthed contact.

15. The combination with the features set forth in claim 8, of achamber which is disposed above the potential transformer tank and through which the insulating tube passes, a contact on the insulating tube to which the upper end of the fuse is connected, a contact in the chamber connected to an external electric circuit, a contact in the chamber connected to earth, and an isolating switch in the chamber which can be moved to connect the contact on the insulating tube either to the circuit contact or to the earthed contact.

16. The combination with the features set forth in claim 11, of a chamber which is disposed above the potential transformer tank and through which the insulating tube passes, .a contact in' the chamber connected to the external electric circuit, a contact in the chamber connected to earth, and an isolating switchin the chamber which can be moved to connect the contact on the second metal .tube either to the circuit contact or to the earthed contact.

17. The combination with the features set forth in claim 3, of a chamber which is disposed above the potential transformer tank and through which the insulating Atube passes, a contact on the insulating tube to which the upper end of fuse is connected, a contact in the chamber connected to an eX- ternal electric circuit, a contact in the chamber connected to earth, an isolating switch in the chamber which can be moved to connect the contact on the insulating tube either to the circuit contact or to the earthed contact, a cover for the upper end of the insulating tube, and means for preventing removal of the cover to permit the fuse to be withdrawn unless the isolating switch is in its earthed position.

18. The combination with the features set forth in claim 8, of a chamber which is disposed above the potential transformer tank and through which the insulating tube passes, a contact on the insulating tube to which the upper end of the fuse is connected, a contact in the chamber connected to an external electric circuit, a contact in the chamber connected to earth, an isolating switch in the chamber which can be moved to connect the contact on the insulating tube either to the circuit contact or to the earthed contact, a cover for the upper end of the insulating tube, means whereby the fuse can be withdrawn through the upper end of the insulating tube when the cover is removed, and means for preventing removal of the cover unless the isolating switch is in its earthed position.

19. A potential transformer fuse mounting for high voltage electric switchgear, comprising a potential transformer tank, a condenser-type bushing insulator in the wall thereof, a conductor within the bushing insulator connected to the potential transformer primary winding, an insulating tube formed of layers of insulating material and disposed coaxially with the bushing insulator, a potential transformer fuse mounted within such insulating tube with its lower end connected to the upper end of the conductor within the bushing insulator, overlapping conducting layers of short length interleaved with the insulating layers of the insulating tube and acting to grade the stress set up between the two ends of the fuse when the fuse has blown, a circuit-breaker tank disposed by the side of the potential transformer tank, a circuit-breaker immersed in oil therein, a chamber which is disposed above the two tanks and through which lthe insulating tube passes, a` conductor leading from one of the contacts of the '15 Circuit-breaker into the chamber, a Contact in the chamber connected to an external oircuit, an isolating switch eontrollingthe con-v nection between such Contact and the conductor leading to the circuit-breaker, a Con- 10 tact on the insulating tube to which the upper end of the fuse is Connected, and a second isolating switch in the chamber controlling the connection between such Contact and the Contact connected to the external circuit. 15 Invtestimony whereof we have signed oui` names to this specification. v

JOHN CHRISTIE. g DONALD FOSTER AMER.

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Classifications
U.S. Classification361/616
International ClassificationH01H9/00, H01H9/10
Cooperative ClassificationH01H9/104
European ClassificationH01H9/10C