JPS59172917A - Cable terminal connector structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a cable termination connection.

Hitherto, for example, terminal connections such as cross-linked polyethylene insulated cables (hereinafter referred to as "Cv cables") have been known, such as capacitor type using an oil-immersed capacitor or shield type using a bell mouth. The former is
Used for termination connections of 275 KV and above, 275 K
The latter p-shielding type is applied to cables with low voltages below V to ultra-high voltages.

In such shielded type terminations, stress cones made of rubber or bell mouths made of epoxy or cross-linked polyethylene resin are used.

Ru. In an OV cable, the insulator thermally expands and contracts due to the temperature rise caused by energization of the cable conductor, and the insulator used as the insulation reinforcing layer must be made of a material that can follow this expansion and contraction. Therefore, the solution is to use the above-mentioned materials made of the same material as the cable insulator. Since the bell mouth has a large diameter and a large weight, which poses various difficulties in terms of manufacturing technology and work, there has been a desire for a terminal connection for large conductor cables that does not use a bell mouth.

The object of the present invention is to solve the problems of the prior art described above.
An object of the present invention is to provide a novel cable termination connection that does not use a bell mouth.

That is, the gist of the present invention is to provide an insulation reinforcing layer made of a material that follows the thermal expansion and contraction of the insulator on the outer periphery of the cable insulator, and to provide an insulation reinforcing layer made of a material that follows the thermal expansion and contraction of the insulator, and to provide a conductive layer on the tip of the conductive layer provided on the slope portion of the insulation reinforcing layer. An electric field shielding ring is attached, a shield electrode is arranged around the outer periphery, the cable is covered with an insulator tube, and the inside is pressurized and filled with insulating oil to form a cable terminal connection part.

Hereinafter, the present invention will be specifically explained with reference to the drawings. The drawing is an explanatory cross-sectional view showing an example of a cable termination connection part according to the present invention.

A predetermined length of the insulator of the cable 1 is exposed, and an insulation reinforcing layer 2 is provided around the outer periphery. The insulating reinforcing layer 2 is made of a polyolefin sheet such as a high-density polyethylene sheet processed by Enzess, or an insulating paper such as stretchable kraft paper. A conductive layer 4 formed by winding a conductive polyolefin sheet or tape is provided on the slope portion 3 of the insulation reinforcing layer 2 so as to straddle the cable 1 . At the tip of this conductive layer 4, an electric field shielding ring 5 is provided. The ring 5 preferably has a large curvature, and is used by molding semiconductive polyolefin, a stretchable metal body, an insulating polyolefin coated with a semiconductive layer, or the like. Alternatively, a semiconductive polyolefin coated with an insulator may be used. In this case, a wire for connecting to the conductive layer 4 of the slope of the insulation reinforcing layer is used. line is attached. An external shield electrode 6 is disposed on the outside of the insulating reinforcing layer 2 provided with the electric field shielding ring 5 so as to cover the reinforcing layer 2. The external 7-lead electrode 6 is constructed by providing a conductive layer 7 on an insulator such as epoxy resin or crosslinked polyolefin. The outside of these is covered with an insulator tube 8, and the inside is filled with insulating oil 9 under pressure. Suitable materials for the insulator tube 10 are epoxy resin, porcelain, etc., and the outside thereof is housed in a case 10 filled with an insulating material such as SF6 gas or transformer oil.

Reference numeral 11 denotes a lower copper tube, and an oil-proof water layer 12 is provided to seal the insulating oil filled inside.

In the present invention, since the cable terminal connection section is configured as described above, it is possible to easily obtain a terminal connection section with excellent electrical performance without requiring a large-diameter bell mouth, and it is also economical.
This dramatically improves work efficiency. Furthermore, the present invention can be applied to large conductor and ultra-high voltage OV cable terminations, which have been difficult in the past, and the present invention has extremely great industrial value.

[Brief explanation of the drawing]

The drawing is an explanatory cross-sectional view showing an example of a cable termination connection part according to the present invention. 1: Cable 7: Conductive layer 2: Insulating reinforcing layer 8: Nislop part of insulator tube 3 9: Insulating oil 4: Conductive layer 10: Case 5: Electric field shielding ring 11: Lower steel pipe 6: External shield electrode 12: Oil-proof water layer = 5-

Claims (1)

[Claims] (1) In a cable termination connection configured using an oil-immersed electric field shielding method, an insulation reinforcing layer made of a material that follows the thermal expansion and contraction of the insulator is provided on the outer periphery of the cable insulator, and the insulation reinforcing layer is A cable termination characterized by attaching an electric field shielding ring to the tip of a conductive layer provided on the slope part, arranging an external shield electrode on the outer periphery of the ring, covering the ring with an insulator tube, and filling the inside with insulating oil under pressure. Connection part.