DE2331672A1 - CONNECTION FOR MULTI-WIRE BELT CABLES - Google Patents

Description

FATEfclANV / XLTE DR. E. WIEGAND DiPL-ING. W. ΝΙΓλ'ΛΜΝ 2 O O 1 D / 2 DR. Ai KÖHLER DIPL-ING. C GERNHARDT MÖNCHEN HAMBURG

TELEPHONE: 395314 2000 HAMBURG 50, »« «6.73

TELEGRAMS: KARPATtNT ICDNIGSTRASSE 28

received on.

W.25 780/75 8 / ls

Industry Pirelli S.p.A. Milan (Italy)

Connection for multi-core belt cables.

The invention relates to connections for belted multi-core cables intended for medium-sized Voltages, especially intended for voltages above 3 fcV are.

As is well known, multi-core belt cables are cables with a non-radial electric field in which each conductor has a is wrapped in an impregnable insulating material, to form a phase.

The structure formed by the phases is in turn covered with a layer or belt of impregnable material Wrapped insulating material which is covered with a sheath, usually made of metal.

Usually the impregnable insulating material consists of paper, and the impregnating agent is a

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those of the oleoresin type or those based on polybutylene in particular it can be used by the "hidit-wandering" Be kind.

It is known to the person skilled in the art that, when a connection is to be made on cables of this type, normal practice is at the ends to remove a predetermined part of the metal sheath of the two cable lengths concerned. The following is an the two lengths of cable at the break of their sheath, a stress control element is provided to the area the maximum concentration of the electric field from the conductors.

Various types of stress control elements are known · for example, which may largely be used for Cable with a non-pediatric field used type passing through conical widening of the interruption zone of the shell is obtained, or rather the type that can be called from a prefabricated sleeve which is made of a resin and preferably of silicone rubber and has the shape of a cone, as shown in Italian patent application 25 59o A / 72.

After the stress control element is applied, the belt of the cable will be removed as far as the cone, and the phases of the two lengths of cable will be apart separated. Then the ends of the phases of the cable lengths on a part of the gate are stripped of their insulation and connected in pairs by means of a clamp in order to restore the continuity of the conductors. With common connections The isolation of each phase is rebuilt by putting a thick layer of crepe paper in a cigar shape is wound up or by using analog bandages, which are generally impregnated beforehand are, but can also be subsequently impregnated by various methods, for example by injection of resin to isolate each phase from the others.

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OWGiN INSPECTED

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The unit formed by the phases isolated in this way is then covered with a thick layer of paper or with a analog bandage of the aforementioned type, which also covers possible parts of the belt, which are nearby of the claim controls remain.

This further wrapping layer isolates the unit formed by the phases from the metal housing, which to include them. This housing is usually Filled with an insulating agent and surrounded by a jacket made of, for example, Kunsfearz and with is filled with a protective mass.

Because the wrapping of the bandages is carried out between adjacent phases, even if they are at a distance from each other lie, it must be done with paper rolls that are in the spaces between the one rebuilt phase and the other phase introduced to be cigar-shaped To generate structures that are then to be brought closer together for the final overall winding. Hence the initial separation the phases greater than what they have in the completed compound. This leads to a bigger one Length of the connection with respect to the length that would be obtained if the phases were only divided by the distance that they have in the completed connection. In addition, the Operations of excessive separation of the phases and their re-approaching the insulating papers of the phases in the separation zone subjected to double stress, so that there is a risk to the integrity of the phases.

Furthermore, as is known to those skilled in the art, great care must be taken in the winding of tapes take place so that it can be completely identical in shape, d. H. it must be wound with a constant slope so that

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no wrinkles are created in the ligaments that could trap harmful air bubbles.

Therefore, a highly skilled work is required, and the process of installing a connection is tedious and expensive.

Connections for paper-impregnated three-phase cables with a non-aradial field can use a Require a time of about ten hours during which the entire line is interrupted.

One purpose of the invention is to remedy the above-mentioned drawbacks and to provide an improved connection to create obtained by means of prefabricated elements which are easily assembled and even from not can be assembled by highly qualified persons.

Another purpose of the invention is to create a connection in which the impregnating agent penetrates completely by flowing to every part of the housing, thus eliminating the risk of air bubbles being formed, which is the case with common compounds, the paper. or have analog bandages.

Another purpose of the invention is to provide a connection of a smaller size, since a diminished one Divergence of the phases is required.

In particular, the invention relates to a connection for multi-core belt cables, which by means of an impregnating agent impregnated paper ^ are insulated and in which the ends of the Cable lengths are freed from their metal sheath on a predetermined part, and in which a stress control element at the point of interruption of the metal shell around the belt, which is close to the stress control element is interrupted, which is formed by simply expanding the metal shell conically can be, with conductor insulated from the belt

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protrude, which diverge from each other and are freed from the isolation at their ends, around the corresponding conductor cores of the two cable lengths to restore the phases in pairs by means of a To connect terminal, and wherein the whole is enclosed in a metal housing.

According to the invention, such a connection is characterized in that those parts are each restored Phase comprising the clamp and isolated sections of the interconnected by the clamp Conductor cores comprise barriers which are insulated with respect to one another and with respect to the housing are formed by prefabricated compact elements, as well as with spacer elements that keep them in mutual spacing and with spacing elements centering them with respect to the housing, the Housing is filled with insulating material.

A preferred embodiment of the invention is a connection for multi-core belt cables, which is characterized in that the said parts are related one on top of the other and with respect to the housing insulating barriers of curved longitudinal elements made of synthetic resin which are inserted into the space between the separated and restored phases and each of which is directed with its concave side against a phase and its longitudinal edges on the generatrices of the Inner surface of a cylindrical sleeve made of synthetic resin, which extends over a length which is the length of the Clamp plus the length of the isolated sections of the two cjjj the terminal corresponds to the conductors connected to it, and which is provided with spacer arms in relation to the housing, which run radially and are spaced from one another, and

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that each curved longitudinal element forms a hollow body with the corresponding curved part of the sleeve, which surrounds the phase in question and an insulating barrier between the phases and in relation to the housing represents the unit formed by the curved longitudinal elements, the cylindrical sleeve and the arms of the sleeve represents a spacing and centering device with respect to the housing, which is filled with insulating material is.

Another preferred embodiment of the invention is a connection for multi-core belt cables, which is characterized by the fact that the prefabricated insulating Barriers that act reciprocally between the phases and in relation to the housing, formed by sleeves are made of a heat-shrinkable material (such as Polyolefin resin, polyvinyl chloride, polyethylene or the like) consist and each terminal and the insulated sections of the two interconnected by the terminal Conductor cores reversed, and that the elements for mutual In spacing the phases and the centering spacer elements in relation to the housing from Resin-made star-shaped elements are formed, the arms of which are circumscribed by a circle, whose Diameter is equal to the inner diameter of the cylindrical part of the housing, these star-shaped elements between the phases are arranged in zones near the outer edges of the sleeves and the housing with a cold-cast insulating agent is filled. The expression "Cold-pourable isolating agent" in this case means a composition which is flowable at the time of pouring, which is carried out at room temperature. This composition consists of at least two components which, when reacting with one another, form a solid or plastic product of high compactness with generation of heat. Different compositions of this species are usually found in cable accessories

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2 331b? 2

facilities used.

The invention is explained below with reference to the drawing, for example.

Fig. 1 shows a first embodiment in longitudinal section a connection according to the invention for three-core belt cable again. Figure 2 is a cross-sectional view of the connection

according to Fig. 1 along the line 2-2 of Fig. I. Fig. 3 shows a second embodiment in longitudinal section a connection according to the invention.

FIG. 4 is a cross-sectional view of the connection according to FIG. 3 along the line IV-IV of FIG Fig. 3-

The connection shown in Fig. 1 is such for a three-core belt cable which is covered with an insulating means is isolated. The two cable lengths Io and Ιο ', which are against the connection point are directed, have a metal shell 11 or 11 ', which is made of lead or another conductive material such as aluminum is made and removed for a predetermined length.

At the point of interruption of the cover 11 or 11 ', a stress control element 13 or 13' is provided around a belt 12 or 12 ', which is made of a synthetic material, preferably silicone rubber, and is covered with a semiconducting crepe paper 1h or 14' is, which connects the conical surface 15 or 15 'of the element 1} or 13' with the shell 11 or 11 '. The belt 12 or 12 'is interrupted by a sharp cut at the end of the stress control element 13 or 13'. From the point of interruption of the belt 12 or 12 'from three insulated conductor cores 16, 17, l8 or l6', 17 ', l8 ^f , which diverge at their ends from their

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OWGJNAL INSPECTED

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Isolation 19, 2o, 21 or 19 ', 2o', 21 'are exempt, so that their conductor ends 22, 23, 24 or 22 ', 23', 2V exposed.

The insulation of the conductor strands 22, 23, 24 or 22 ', 23 ', 24' is tapered like a pencil tip at the point of interruption (in Fig. 1 only the tapers 25, or, 25 ', 26' of the insulation 19, 21, or 19 ', 21 * shown)

Corresponding wire strands of the two cable lengths are connected to one another by means of clamps to the Restore phases. The phase a is restored by means of a terminal 27, which the conductor strands 22, 22 'connects} the phase b is restored by means of a terminal 28 (Figure 2), which the Conductor strands 23 and 23 'connects to each other, and the phase c is restored by means of a terminal 29, which connecting the conductor strands 24 and 24 'to one another.

The one formed by the restored phases a, b, c Structure is surrounded by a prefabricated cylindrical sleeve 30 (Fig. 2), which is made of a compact insulating material (For example, a polyester resin reinforced with glass fibers) and its inner diameter is greater than the maximum diameter of a data circle lying in a transverse plane, which the three phases ^ n the point of its maximum divergence circumscribes the they have in the finished connection.

The sleeve 30 extends along the length of that fabricated from the four Phases a, b, c formed structure over a length £ ,, extending over the terminal of each phase and isolated Sections of the two conductor wires connected to one another by the terminal are drawn.

The sleeve 30 is provided with spacer arms 32 (Fig. 2) provided with reference to a metal housing 31 which encloses the connection and the continuity of the sheaths 11, 11 'restores.

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Preferably, the spacer arms 32 are preformed together with the sleeve 30, and they are aligned with one another on the sleeve in the primary direction and are arranged at a distance from one another. Within the sleeve 30 and in the space located inside the diverging phases, a plurality of prefabricated curved longitudinal elements 33 »34, 35 are provided (one element for each phase), which are made of a compact insulating material, preferably of a synthetic resin, such as e.g. B. a glass fiber reinforced polyester resin. These curved elements that have a length Λ,. ^ L · have, in cross-section, preferably in the shape of part of a circular ring, and the concave side of each element is directed against the relevant phase a or b, c. The chord of the circular ring part lies in such a way that the longitudinal edges of the curved elements 33, 34, 35 are circumscribed by a cylindrical surface, the diameter of which is equal to the inner diameter of the sleeve 30, and that they lie on generatrices of the cylinder surface.

^s In the illustrated preferred embodiment, the curved longitudinal members 33, 34, provided on its convex surface with radial AfcstandhaltestUcken 36 35, which are spaced from each other and have the task to leave a cavity between the curved longitudinal members. Each of the curved longitudinal elements 33, 34, 35, together with the part of the sleeve 30 spanned by it, forms a hollow body around the corresponding phase, which constitutes a dielectric barrier and serves both as a mutual barrier between the phases and as a barrier with respect to the Housing 31 acts. Furthermore, the curved longitudinal elements 33, 34, 35 with their spacer pieces 36 and the sleeve 30 with its arms 32 act as reciprocal spacers between the phases and as centering spacers with respect to the housing 31.

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ORIGINAL INSPECTED

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The housing 31 consists of two cup-shaped halves 37 and 38, the edges of which face one another. The end of one housing half 37 . is provided with an extension 39 which mates with the end of the other housing half 38. The two housing halves 37, 38 are rigidly connected to one another along their circumference 4o. Each of the two housing halves 37 and 38 is provided with an opening 43 or 43 'for introducing the insulating means filling the housing 3I. This insulating means is of the hot-cast type, for example of the oleoresin type or of the synthetic type (polybutylene). Laboratory experiments that the were performed ölharzart with resins which may be ^variables at room temperatures between Ho and l8o ° ^C S ^e S, have shown that it is possible to fill each cavity within the housing 3I and to eliminate any air inclusion, even if the connection is kept completely horizontal during the pouring process. On of the diverging phase 'formed structure windings 42 and 42, respectively, near the diverging zone' applied from ⁿ Sterling "silk, to prevent the phases aufein with reference * Move the other, if a short circuit should occur in use, .

The connection shown in Figs. 1 and 2 can be assembled very quickly. In fact, it is sufficient to apply the relevant halves 37 and 38 of the housing 31 to each of the two cable lengths 7o, Io 'at a sufficient distance from the connection zone and to push the sleeve 30 onto one of the cable lengths, for example the cable length. After the predetermined part of the metal shells 11, 11 'has been removed and the stress control elements 13, I3 ¹ and the semiconducting covers

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ORIGINAL IMSPECTEO

14, 14 'have been applied, the belt 12 or 12 ^{f is} interrupted near the divergence zone of the insulated conductor cores 16, 17, 18 or 16 ^f , 17', 18 '. The wires are brought into a divergent position, and only over an angle that is sufficient to be able to connect their ends, which are formed by the conductor strands 22, 25, 24 or 22 ', 25 *, 24' which have been freed from their isolation 19, 2o, 21 or 19 ^f , 2o ', 21 * on a predetermined part.

The conductor strand 22 is connected to the corresponding stranded conductor 22 'by the terminal 27, and on in this way phase a is restored. Phase.-b is restored in the same way by connecting the conductor strands 25 and 23 'together through the clamp are connected, and phase c is restored by pulling the conductor strands 24 and 24 'together through the Terminal 29 must be connected.

After these connections have been made, the three curved longitudinal members 33, 34, 35 in the space arranged between phases a, b and c, each element having its concave side against a corresponding one Phase is directed, namely the Eleinenit 33 against the phase a, the element 34 against the phase b and the element 35 against phase, c. The central cross-section of the curved elements 33, 34, 35 lies in the same plane as that central cross-section of terminals 27, 28, 29-

The relative position of the curved elements 33, 34, is set in such a way that the longitudinal edges of the elements all coincide with the generatrices of a cylindrical surface, the diameter of which is equal to the inner diameter of the sleeve 30.

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Then the sleeve 30 is pushed onto the longitudinal elements 33, 34, 35 in such a way that it is more central Cross-section lies in the same plane as the central cross-section of the clamps.

Then the halves 37 and 38 of the housing 31 are pushed together, and at their circumference 4o together welded. The outer ends 4l and 4l 'of the two Cup-shaped housing halves 37, 38 are attached to the respective Sheaths 31 and 11 'applied tightly and welded to them.

Finally, the Isolierm mittel ^{1 is} poured to fill the housing 31.

Laboratory tests have shown that for a cable with a non-radial field, the connection with a Hot-pourable oleoresin composition in 1 1/2 hours can be manufactured and that it is ready for use within a maximum of 3 hours from the start of installation ready.

In Fig. 3 and 4, r is a compound of the invention represented a further embodiment, wherein parts corresponding to those of the embodiment according to FIGS. 1 and 2, are provided with the same reference numerals and need not be described again here.

.At the connection according to FIGS. 3 and 4, each clamp and parts of the insulated conductor cores connected by them from a sleeve 44 or 45 * 46 heat-shrinkable synthetic resin (e.g. from the Palyolefinart) enclosed. Each of these, cuffs 44, 45, 46 consists of two parts that are attached to their overlap ends facing each other in a ring shape. Possible voids inside each cuff will be turned off by the irregular zones (ends of the enclosed terminal and overlying pieces of the

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cuff parts made of heat-shrinkable material) be filled with a suitable plastic (for example polyfcobutylene).

Pig. 3 shows the cuff 44 belonging to phase a, which consists of two parts 47 and 48, which are attached to their overlap facing ends on an annular piece 49, and the cuff 46 belonging to phase c, which is composed of two parts 5o and 51, which are overlap on an annular piece 52 at their facing ends.

For the three-core cable according to FIG. 3, star-shaped parts 53 and 53 ^{1 are} provided, which have the shape shown in FIG. 4 and whose arms 54 and 54 'are circumscribed by a circle, the diameter of which is equal to the inner diameter of the housing 31 & n its cylindrical section is. The star-shaped parts 53, 53 'are provided with a central round hole 55 and 55', respectively.

The time for the assembly of the connection according to FIGS. 3 and 4 corresponds approximately to the time for the Assembly of the connection according to FIGS. 1 and 2 is required.

When installing the connection according to FIGS. 3 and 4 i after the insulated cable cores l6, 17, l8 resp. l6 ',. 17' ,. 18 'are separated, one part of each' of the sleeves 44, 45, 46 are pushed onto each cable core. This is particularly the case for the phases that can be seen in FIG. 3 a and c made the following: for phase a, one part 47 of the sleeve 44 is placed on the insulated wire l6 and the the other part 48 of the mesh 44 is pushed onto the insulated wire 16 ', while for phase c one part 50 of the man * .. cuffs 46 pushed onto the insulated wire l8 and the other part 51 of the cuff 46 on the insulated wire l8 ', will.

The sleeve parts are loose with respect to the insulated cores concerned, i. H. their diameter is something

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larger than the diameter of the clamp in question that they enclose.

The conductor cores with their associated terminals are then described in the manner described above with reference to FIGS Way restored. Then the cuff parts in question are pushed onto the clamps in such a way that they overlap at their facing ends along a circular piece.

The star-shaped parts 53, 53 ^{1 are} now inserted between the phases on the outer of the three cuffs 44, 45, 46 (e.g. at the edges 56, 56 'and 57, 57 ^{f of} the cuffs 44 visible in FIG. 3 (Phasea) and 46 (Phase c) y Then the housing 31 is installed and a cold-castable self-polymerizing insulating agent is poured in; the development of heat causes the heat-shrinkable sleeves 44, 45, 46 to shrink.

The details of the connection described may of course be different from those shown, so could the stress control cone can also be caused by expanding the metal shell in the interruption zone, the point of interruption of the belt could be shaped like a pencil point and not so close to that Stress control cone, etc.

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Often * Q: NÄs. INSPECTED

Claims (10)

Patent Claims 1. Connection for multi-core belt cables, which are insulated by means of paper impregnated with an impregnating agent are and in which the ends of the cable lengths directed against the connection point are on a predetermined Part of their metal shells are freed and where a Stress control element is arranged at the point of interruption of the metal shell around the Oürtel, which is close the stress control element is interrupted, which is formed by simply expanding the metal shell conically may be, with insulated conductors protruding from the belt, which diverge from each other and at their ends from the insulation are released to the corresponding conductor cores of the two cable lengths to restore the phases in pairs to be connected by means of a clamp, and wherein the whole is enclosed in a metal housing, characterized in that that those parts of each restored .Phase which the terminal and isolated sections of the through the terminal comprise conductors connected to one another, with them in relation to one another and in relation to the housing insulating barriers, which are formed by prefabricated compact elements, as well as with them alternately in Spacing spacers and with them in relation spacing elements centering on the housing are provided, the housing being filled with insulating material. 2. connection right claim 1, characterized in that that the said parts with respect to each other and with respect to the housing insulating barriers of curved Longitudinal elements (55, 54, 55) are formed from synthetic resin, which are inserted in the space between the separated and restored phases (a, b, c) 309883/1064 Zoo ι -. / ζ - Id - and each of which has its concave side directed against a phase and the longitudinal edges of which lie on generatrices of the inner surface of a cylindrical sleeve (30) made of synthetic resin which extends over a length which is the length of each clamp (27 or 28, 29) plus corresponds to the length of the insulated sections of the two conductor cores connected to one another by the terminal (e.g. l6, I6 ¹ ), and which is provided with spacer arms (32) with respect to the housing (31) which run radially and at a distance from one another and that each of the curved longitudinal elements (33, 34, 35) forms with the corresponding curved part of the sleeve (30) a hollow body which surrounds the phase in question and constitutes an insulating barrier between the phases and in relation to the housing , the unit formed by the curved longitudinal elements, the cylindrical sleeve and the arms of the sleeve constituting a spacing and centering device with respect to the housing, which s is filled with isolating agent. 3. A compound according to claim 1, characterized in that the prefabricated insulating barriers, the act alternately between the phases (a, b, c) and in relation to the housing (31), of sleeves (44, 45, 46) Are formed from a heat-shrinkable material (such as polyolefin resin, polyvinyl chloride, polyethylene or the like.) consist and each terminal and the insulated sections of the two conductor wires connected to one another by the terminal enclose, and that the elements for the mutual spacing of the phases and the centering spacer elements with respect to the housing, are formed by star-shaped members (53, 53 ') made of resin, whose arms (54) are circumscribed by a circle whose diameter is equal to the inner diameter of the cylindrical 309883/1064 OWGJNAL INSPECTED Part of the housing (31), these star-shaped elements (53, 53 ') between the phases (a, b, c) in Zones near the outer edges of the cuffs (44, 45, 46) are arranged and the housing with a cold castable Isolating agent is filled. 4. A compound according to claim 2, characterized in that the cylindrical sleeve (30) has a length which is greater than the length of the curved longitudinal elements (33, 34, 35). 5. A compound according to claims 2 and 4, characterized in that the curved longitudinal elements (33, 34, 35) have the shape of part of a circular ring in cross section. 6. A compound according to claim 5, characterized in that the curved longitudinal elements (33, 34, 35) with at a distance radial spacer parts lying apart from one another (36) are provided. 7. A compound according to any one of claims 2, 4, 5 and 6, characterized in that the housing (31) filling Insulator is of the oleoresin type. 8. A compound according to any one of claims 2, 4, 5 and 6, characterized in that the housing (33) filling Insulating agent based on polybutylene is.. 9. A connection according to claim 3, characterized in that each of the sleeves (44, 45, 46) is made of two heat-shrinkable materials Material existing parts is formed, which are at their facing ends on an annular A piece that corresponds to a central piece of the terminal enclosed by them - overlap. 10. A compound according to claims 3 and 8, characterized characterized in that each of the star-shaped elements (53> 53 ') is provided with a central hole (55 or 55') is. O 9 8 8 3/1 O 6 - .18 - Π. Connection according to claims 5, 8 and 9, thereby characterized in that the insulating medium filling the housing (31) is of the room temperature castable type. 309883/1064 Le 'ά rs ei \ e