DE1071183B - - Google Patents

Description

GERMAN

As is well known, cable terminations for high-voltage cables can be made by hand at the installation site by placing tapes or tubular wrappings made of insulating paper on the core or the insulated conductor of the cable can be wound up or directly attached by using pre-made paper wraps will. The winding lobe produced in this way is usually also supported by other components completed, e.g. B. Control electrodes for the electric field, which are metallic with the earth or connected to the cable ladder. Such control electrodes are sometimes referred to as "deflectors". Finally, the winding cone with a bell-type insulator made of porcelain, a Condensation resin or the like. Surrounded.

In general, the cable terminations can be used for reasons of space or other needs to carry, assume the most varied of positions.

So it can be B. in the case of a transformer entry may be useful, an oil-filled cable termination with a preferably conical insulator tapering from top to bottom, in which the cable is inserted from above. An example of this is shown in FIG. 1.

In this figure, 1 denotes the cable core, 2 denotes the insulating winding lobe prefabricated from paper layers, 3 denotes the outer porcelain insulator filled with oil or gas, and 12 denotes the deflector. The deflector forms the shield of the cable core at the point where the cable enters the termination and is electrically connected to the metallic jacket of the cable.

With such a structure, the paper winding seeks the winding lobe 2 due to its own weight to slide downwards, which carries the risk of changing their uniformity.

In addition, when the outer insulator is conical in shape, the paper layers 2 approach the inner surface of the insulator in a questionable manner when they slide downwards, so that under certain circumstances the free passage of oil or gas can be blocked.

If the isolator 3 is approximately cylindrical, a relatively simple one is used. Possible solution to this problem. This solution is explained below using the cable termination according to FIG. 2. In this cable end closure, the paper layers of the winding cone 2 are extended over the entire length of the cable end closure and are supported at the bottom, for example by a metallic plate 11 , which in turn is supported by a sleeve screwed onto the wire end fitting of the cable at point 9. The carrier plate 11 can be a metal plate.

Cable termination
for high voltage electrical cables
with a preferably conical,
tapering from top to bottom
Insulator,

in which the cable from above
is introduced

Applicant:
PIRELLI Societa per Azioni,
Milan (Italy)

Representative: Dr. E. Wiegand, Munich 15,
and Dipl, -Ing. W. Niemann, Hamburg 1, Ballindamm 26, patent attorneys

Claimed priority:
Italy 8 July 1955

because it is located in a shielded zone of the electric field.

If, however, the insulator 3 has a conical shape, this method cannot be used; rather, the paper roll has to narrow for space reasons and end in an electrically stressed zone.

The main aim of the invention is to provide a center which is suitable for holding the wraps to support the lobe of the cable termination, especially when using a conical one, from above downward tapering insulator, in which there: cable is inserted from above. The specialty of the invention consists in that the winding lobe arranged at the end of the cable core is on an iso liermaterial of high dielectric strength existing funnel-shaped support bearing rests, the mi Holes or openings for the passage of insulating liquid can be provided in its interior the end of the cable surrounds part of the route and through the cable ladder shoe with the mediation of a metal See the ring being worn, which is located in a thru the metallic end flange of the outer insulator electrically shielded zone. Preferred

909 689/43

Claims (8)

Such an end closure is not freely hanging, but is firmly supported. This support bearing is located in an area exposed to high ctric stresses and must therefore not be made of metal; ß. a Gunkunstrz, preferably one of the ethoxylin group, or made of hard pier, porcelain or glass treated with synthetic resin. The ethoxylin resins can be provided with an addition of chemical agents; You can also use organic substances such as quartz powder, kaolin. be offset. The same ethoxylin resins with hardeners, but 1S ne inorganic additions, can be dipped in a mold under vacuum to create a red insulating structure, for example made of paper or glass fabric, silk, cotton. Asbestos or the like to ink. In Fig. 3 an embodiment, for example, a ngendeu cable end closure according to the Erliudung rgesteiled, wherein the insulator 3 is conical and the ickelkeule 2, which is formed for example from a paper cover, supported by the cup-shaped and a5 possibly perforated insulating bearing 4 rd; this can consist of one piece or of several parts held together like a binding, for example a binding made of finished side bands. The bearing 4 can, with its smaller irnfläche supported on the operating de pipe 10 of the same material, attached to the cable core and held by the metallic sleeve 7, which is screwed on at 9 f, the end-nature 8; the bearing 4 and the support tube 10 can also form a monolithic funnel-shaped piece. Fig. 4 shows, as a further embodiment, another embodiment of a cable termination according to the invention, which is provided with a deflector connected to the conductor. This gate, which is used to control the electric field, consists of a ring 6 made of metal or of its electrically conductive material, which is embedded in the dielectric mass 5 formed in the cast synthetic resins, preferably those of the ethoxy group. In the embodiment according to FIG. 4, t 3 is also the conical insulator and 2 is the winding lobe supported by the cup-shaped insulating bearing 4. The insulating bearing is supported with its inner end face on the aforementioned deflector, which in turn is supported by the metallic sleeve 7 stolen from the cable 9 on the wire end fitting 8 of the cable. In this case, too, the optionally solid bearing 4 can consist of a single piece or of several pieces held in place by means of a bond made of insulating material. The composition of the above-described hinged closures can be carried out, for example, as follows: The winding lobe 2, which can expediently be narrowed at its ends, is wound or pushed onto the cable core 1. Then the truncated cone-shaped bearing 4 is placed on the ide of the cable core 1; If it is one piece, it is spared, if it is made up of several pieces, you arrange your parts, idet them together and then push the tube 10 Wire end fitting 8 of the cable can be connected and screwed the sleeve 7 onto the end fitting. Finally, if not already done, the insulating sleeve is designed in the shape of a trumpet at its other end 12. The shielding of the cable core at its point of entry into the cable termination is then formed on it by a wire winding with tightly juxtaposed turns. This shield is grounded by an electrical connection with the metallic cable sheath, which is usually made of lead or aluminum. The cable termination is now ready for receiving the insulator 3 with the corresponding end plates and for filling with the liquid or gaseous insulating agent. Claims. 1. Kallelendverschluß for electrical Hochspaunungskabel with a preferably conical, from top to bottom tapering insulator, in which the Kaliel is inserted from above, characterized in that the winding lobe arranged at the end of the cable core on a funnel-shaped made of insulating material of high dielectric strength Support bearing rests, which can be provided with holes or openings for the passage of insulating liquid into its interior, surrounds the cable end on a section and is carried by the cable ladder shoe (8) under A ^ determination of a metallic ring (7) , which is in a through the metallic end flange of the outer. Isolator electrically shielded zone is located. 2. Cable termination according to claim 1, characterized in that the consisting of insulating material Warehouse consists of a prefabricated piece. 3. Cable termination according to claim 1, characterized in that the consisting of insulating material Storage is formed from various prefabricated parts, which are bound by a binder are held together from insulating material. 4. Cable termination according to claim 1 to 3, characterized in that the bearing made of cast synthetic resin consists, preferably of mixed with hardeners and optionally with inorganic Substances laden ethoxylin resins. 5. Cable termination according to claim 1 to 3, characterized in that the bearing is a Has skeleton serving porous insulating structure, which with synthetic resins, preferably Äthoxylinharzeti is impregnated with hardening agents, but without inorganic admixtures, in a vacuum. 6. Cable termination according to claim 1 to 3, characterized in that the insulating bearing from Hard paper, which is treated with a condensation resin, consists. 7. Cable termination according to claim 1 to 3, characterized in that the insulating bearing from Porcelain is made. 8. Cable termination according to claim 1 to 3, characterized in that the insulating bearing from Glass is made. Considered publications:
German interpretative document No. 1 005 588. : Guessings © 909 689/434 12. 59