DE3312025A1 - Very high voltage (very high tension, extra high tension, EHT) cable having an end termination with a wound (wire wrapped) shield - Google Patents

Abstract

In the case of a very high voltage cable, the end termination shield is wound from insulating strips (2) between which conductive strips are wound as capacitive field-control inserts (3). In the control inserts (3), a plurality of cylindrical parts are connected to one another by means of conical or radial parts (6) so that the inserts appear bent in longitudinal section. Towards the base of the shield, the inserts are bent more and more, and accordingly overlap to a greater and greater extent. <IMAGE>

Description

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Fl 4680 - * 03/29/83

High voltage cable with a termination with coiled Club

The invention relates to an extra-high voltage cable with a termination, whose club is wound from insulating tapes, into which tapes that are conductive as capacitive field control inserts are wrapped so that the control inserts from the head (connecting bolt) towards the foot (earthing socket) of the termination in Increase in diameter and length and overlap in the axial direction rag. It is used especially for XLPE-insulated construction cables with outdoor terminations for 110 or 220 kV. '. . . ·

. From DE-AS 21 42 283 is a termination for with polyethylene (PE) insulated high-voltage cables are known in which the end closure lobe is welded homogeneously to the cable insulation and is capacitively controlled. The club consists of on the cable insulation rolled up and welded with these PE tapes with inserted conductive PE foils. ' But it can also be shrunk onto one another in concentric layers Heat shrink tubing exist between which for capacitive Control of electrically conductive shrink tubing or foils are arranged.

In a special embodiment, the club consists of in axial direction successive, respectively overlapping, insulating heat shrink tubing, between each of which conductive shrink tubing are arranged. The field control

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layers are arranged so that no more than two through the Isolation of separate control inserts overlap. The plastic end seal is made of plastic bendable so that it can be wound onto a cable drum together with the connected cable and transported can. The disadvantage here, however, is that the isolating lobe with the field control does not yet have a structure, manufacture and effect is optimal.

The invention is therefore based on the object of an end closure to improve the construction, manufacture and effect of the isolating lobe with the field control in the manner described, that it is suitable for extra-high voltage cables in the voltage range of 220 kV can be used. ^

This object is achieved in that from j Head (connecting bolt) to the foot (earthing socket) of the end cap. Only the first control deposit is cylindrical, but then several cylindrical parts go through in the following deposits conical or radial parts are connected to one another, and the control deposits initially increase in length by one step, then with two steps, with three steps, etc. This means that the control deposits do not appear axially parallel in the longitudinal section straight, but cranked (stepped). It is essential that the tax deposits from the beginning of the club winding on the head, des End closure on over the belly to the foot more and more often cranked are and that they overlap accordingly in an ever increasing number, since their diameter and increase in length from head to foot. At the foot, the tax inserts are wrapped in a funnel shape and with the Ground socket connected.

It is advantageous that the diameter of the funnel opening as a result of the multiple cranking of the control inserts and thus associated reduction in diameter is much smaller than with the well-known non-cranked tax deposits fails. By the multiple cranking becomes the diameter of an equally effective

Pl 4680 «-3T. 03/29/83

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The field control, and accordingly the diameter of the insulating lobe, is more than halved.

A very advantageous design of the end closure is obtained according to the further invention in that the lobe is wound from insulating, self-amalgamating tapes made of EPR (ethylene propylene rubber) and conductive tapes made of PE (polyethylene) with the addition of carbon black, which are wound with one another and with the PE Isolation of the cable are welded, and that each insulating coil is wound around the fixed length b beyond the respective control insert so that the angle between the conical control inserts and the longitudinal axis of the end closure is between 10 and 30. In this case, each insulating roll is preferably wound with four layers and each control insert with one layer, both with an overlap of 50 %.

The main advantage of the winding according to the invention is that for high voltage cables in the voltage range of 220 kV is given a termination with the smallest possible diameter. In addition, it is bendable and therefore together with the cable

reelable, so that it is particularly suitable for use in VPE-insulated construction

cables for 110 or 220 kV is used. In addition you need for its preparation less time than with the known end _t · closures.

_A further embodiment of the invention-relates to the winding of the lobe of GPK-material (fiber reinforced plastic), such as, for example, besehrieben in DE-GM 82 25 287th It consists in that the ^fe lobe of insulating threads or Bändem of GRP and control deposits of conductive material is wound, and the cylindrical control deposits are interconnected by wires or radially arranged circumferentially arranged bars of conductive material. The tax deposits consist of conductive GRP threads, carbon fibers or metal wire or tapes made from them, their connections made of copper, aluminum or the material of the tax deposits.

The principle and an embodiment of the invention are shown in the drawing and are described in more detail below. Show it

OJIZUZÜ

Flg. The principle of the shape and arrangement of the cranked field control inserts with angled cranking (step), Fig. 1b the same with a vertical cranking, Fig. 2 a semi-longitudinal section through the end closure of a Ti 0 kV construction insert cable kit '-' eld control inserts with

sloping crank, and
• Fig. 3 the winding scheme for this.

Are marked with

- 1 club

2 electrical tape wrapping

3 field tax deposits

31 ... 310 the individual tax contributions

4 socket bolts

5 Grounding socket over the end of the cable sheath

6 conical parts (inclined steps) of the field control inserts

7 radial parts (vertical steps) of the Feldsteuereinla _f -; en

* 3 thick guide tape to connect the last control inlets 310 with the outer conductive layer 10 of the cable and the grounding socket 5

9 reinforcing guide band for 8

10 outer conductive layer of the cable

11 Cable insulation

In the end closure according to FIG. 2, the lobe 1 is wound from insulating, self-amalgamating tape 2 made of EPR (ethylene propylene rubber), while control inserts 3 made of electrically conductive tape made of PE (polyethylene) with the addition of carbon black are cranked .Form, wound are. The EPR tape (sweat band) used is about 40 mm wide and 0.3 mm thick, the conductive PE tape (conductive tape) 20 mm wide and 0.2 mm thick. Each insulating roll 21 ff. (Except the last one) is wound with 4 layers and each control insert 31 ff. With 1 layer of tape, both with ~ an overlap of about 50 } i.

The winding scheme is from Fig. 3 erm ;. - really. On the core insulation 11 made of VPE (vernetztt.-ra polyethylene) one winds the first insulation coil with four over the entire length of the club

BATH ORIGINAL ^ _m

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Layers of sweatband. The first control insert 31 is then wound at the head of the club with a layer of guide tape, uncranked and with the smallest, predetermined length. Then wrap the second insulating roll 22 over this again with four layers of sweatband, but now the beginning and the end of the insulating roll 22 are offset from the underlying control insert 3.1 by the fixed length a and b to the foot of the club. The offset at the beginning a is between 5 and 10 % of the length of the insulating roll, and it is not critical, since it mainly serves to facilitate orientation during winding. In contrast, the offset at end b is between 20 and 40 % of the length of the insulating roll, and its fixed dimension is decisive for the crank 6 of the second control insert 32 wound over it. The third insulating winding 23 is now wound over it with the specified offset, and above it the third control insert 33. As is known, the length of the control inserts is increased towards the foot of the club for the purpose that the field control by means of the capacitor inserts along the wire effects a voltage divider with a uniform potential reduction.This change in length and the positioning of the individual control inserts can be determined with the computer.

After the last control insert 310 has been wrapped, one wraps thicker conductive tape funnel-shaped down for the electrical connection of this control insert with the outer conductive layer 10 of the Cable and from there to the grounding socket 5. To increase the conductivity wrap it over in the funnel-shaped section a reinforcing guide band 9. Finally, you bring the last one Insulation wrap as well as the first one over the entire length of the club so that the head and foot part of the club are conical and the central part are cylindrical / dial. rend the individual insulation and control wraps applied by hand the last insulation wrap is applied by machine. '.

yOann ^{: As} is known, a shrink tube is pushed over the club and shrunk on. A pressure bandage comes over this

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and a Heizbandwicklung, with which the lobe is a temperature of 90 ⁰ C annealed 10-20 hours at j, so that the EPR-bands of the leg together, the field control deposits and the cable insulation weld homogeneous. Finally, shrink screens are shrunk onto the shrink tubing of the club so that the termination meets all requirements for use in the open air.

Another embodiment of the invention, which can be used with end closures, the club of which is wound from GRP material (glass fiber reinforced plastic), can be seen in principle from FIG. 1b. Such terminations, however, are not flexible. Here the crank 7 is not arranged at an angle, but ¹ perpendicular to the longitudinal axis of the end closure, and it is not formed by the cylindrical control inserts themselves, but by additionally wrapped, wire-shaped or web-shaped, conductive connections.

The materials used for the end cap are: for the insulating windings are resin-impregnated glass threads or fiber bundles or tapes made from them, for the control inserts metallized glass fibers, Carbon fibers or metal wire or ribbons made therefrom. The usual GRP winding technology is used for winding.

The winding scheme is different here compared to the scheme described above: You do not only wind the first and the last Isolation winding 21 or 27, but all isolation and control 'windings along the entire length of the club. First of all, the first insulating winding 21 is wound from several individual layers of GRP material on the cable insulation 11. The first winding control inserts 31 with a certain length and is wound over it. certain Distances along the entire length of the club. Their thickness is chosen so small that the insulating winding applied over it 22 has a uniform diameter, i.e. it does not imitate the control inserts 31 underneath.

But before the insulating winding 22 is applied, a radially oriented, conductive connection 7 must be attached to the end of the corresponding inserts 32, 3> ^ of the later second control winding at the beginning of each control insert 31 of the first control winding (with the exception of the first insert). Wires or webs made of conductive material are used as connections, for example cranked or U-shaped, so that they can be inserted or wrapped with their axially extending ends in the control inserts to be connected. Then the second insulating winding 22 is wound over the entire length of the lobe, over it the second winding control inserts 32, 33 matched to the first control winding and with the respective connections 7, over it the third insulating winding, etc.

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Claims (7)

Pl 4680. ^. 03/29/83 Expectations: . . ϊ 1 .-) Extra high voltage cable with a termination, the leg \ _y (1) of which is wound from insulating tapes (2), in which conductive tapes are wrapped as capacitive field control inserts (3) so that the control inserts from the head (connection "' bolt 4) to the foot (grounding socket 5) of the end closure increase in diameter and length and overlap in the axial direction, characterized in that from top to bottom only the first control insert (31) _.. is cylindrical, but then with the following Deposits several cylindrical parts are connected to one another by conical or radial parts (6 or 7), and the control deposits first increase in length (32-33) with one step (6 or 7), then (34-36) with two Levels, with three levels, etc. 2. Extra high voltage cable according to claim 1, characterized in ^: ge ke η η ζ = eich η et that the last tax deposit (36 or 310) itself or with an additional guide tape (8) is funnel-shaped to the foot of the club and wound down there with the outer Conductive layer (10) of the cable and the grounding socket (5) is connected. 3. Extra high voltage cable according to claim 2, characterized in that the lobe (1) made of isolie- ι Ending, self-amalgamating tapes (2) made of EPR (ethylene j propylene rubber) and conductive tapes (3) made of PE (poly-; ::. "*; .- ·:.: Ο ο ι ζ. Υ ζ. Ο Pl 4680. 2- 29.03.83 ethylene) is wrapped with the addition of carbon black, which are welded to one another and to the PE insulation (11) of the cable, and that each insulating coil (22 ff.) is wound by the fixed length b beyond the respective control insert (31 ff.), so that the angle between the conical control inserts (6) and the longitudinal axis of the end closure between 10 and 30 lies. 4. Cable with termination according to claim 31 thereby characterized in that each insulating coil (21 ff) with four layers and each control insert (31 ff.) With one 'Layer is wrapped, both with an overlap of $ 50. 5. Cable with termination according to claim 1 or 2, characterized . ' G e k e nn ζ ei c hne t that the club (1) made of insulating Threads or tapes (2) made of GPK (glass fiber reinforced Plastic) and control inserts are wound from conductive material and the cylindrical control inserts (3) through radially arranged wires or circumferentially arranged webs (7) ″ made of conductive material are connected to one another.; 6. _s cable with termination according to claim 5, characterized in that the cylindrical control "inserts (3) consist of conductive GRP threads, carbon fibers or metal wire or tapes made of them, their wire or web-shaped connections (7) Copper, aluminum or the material of the tax deposits. 7. Cable with termination according to claim 6, characterized in that the wires or webs (7) cranked or U-shaped and wrapped with their axially extending ends in the control inserts (3) to be connected are.