JPS5825007B2 - Termination section for cross-linked polyethylene insulated power cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cross-linked polyethylene insulated cable (hereinafter referred to as C
(1) This relates to a terminal section for a cross-linked polyethylene insulated cable using a bellmouth-shaped molded reinforcing body to alleviate the electric field at the terminal section of the cable.

For CV cable terminations, an ethylene propylene rubber stress cone and an epoxy housing are used in the case of a dry type, while a capacitor or a bellmouth-shaped molded reinforcement (hereinafter simply referred to as a bellmouth) is used in the case of a wet type.

) may be used. Also, in the case of a capacitor, there is also a configuration in which a bell mouth is combined.

When using a bell mouth, reinforcing paper for the bottom volume of the bell mouth is required.

On the other hand, in the case of a CV cable, the temperature rises due to energization, and the reinforcing paper of the lower volume expands and contracts, causing wrinkles.

Therefore, when using a bell mouth, it is necessary to have a structure that does not cause wrinkles in the lower reinforcing paper.

An object of the present invention is to provide a termination section for a CV cable that can improve electrical performance without causing wrinkles in the reinforcing paper under the bell mouth when the bell mouth is used as an electric field shield at the termination section for a C-cable. be.

In the CV cable termination section of the present invention, a molded stress cone is molded on the cable insulator using polyolefin containing a crosslinking agent, which is the same material as the cable insulator, when a bell mouth is used to alleviate the electric field at the end of the C cable. A polyolefin sheet is wrapped around the outer periphery of this molded stress cone, a molded bell mouth made of polyolefin made of the same material as the insulator of the cross-linked polyethylene electric cable is inserted around the outer periphery of the polyolefin sheet, and A semiconductive layer is formed by winding a polyolefin semiconductive sheet between the sloped surfaces of a molded stress cone and a molded bell mouth.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the C■ cable termination part of the present invention will be described below with reference to the drawings.

At the terminal end, the external semiconductive layer of the C■ cable 1 is exposed, a predetermined length is made of an insulator, and a conductor pull-out rod 2 is compressed and connected to the tip.

C■ Wrap a polyolefin tape containing a crosslinking agent made of the same material as the C■ cable insulator so as to maintain a predetermined slope from the tip of the external semiconductive layer (on the side opposite to the conductor pull-out rod 2 side) of the C■ cable 1, and heat it. A mold stress cone 3 is formed on the insulator by pressure molding.

Incidentally, this molded stress cone 3 may also be a polyolefin block containing a crosslinking agent and having a stress cone sloped surface formed in advance.

A polyolefin sheet 4 is wound around the outside of the mold stress cone 3 so as to match the inclined surface of the mold stress cone 3.

In this case, the polyolefin sheet may be embossed or the polyolefin may be laminated with an insulating paper having an appropriate elongation.

A molded bell mouth 5 whose sloped surface matches a molded stress cone 3 of polyolefin made of the same material as the CV cable insulator is inserted outside the polyolefin sheet 4.

In this case, the molded bell mouth 5 may be formed by molding a semiconductive layer of polyolefin.

Thereafter, a semiconductive polyolefin crosslinked sheet is wrapped between the sloped surface of the mold stress cone 3 and the sloped surface of the mold bell mouth 5 to form a semiconductive layer 6, and the slope is pressed down.

In addition, 7 is an insulator pipe or an outer case, 8 is a lower metal fitting, and 9 is a filling oil.

Since the termination section for the C■ cable of this embodiment is constructed in this way, the occurrence of wrinkles in the lower reinforcing layer of the molded bell mouse is eliminated, and the electrical performance is significantly improved, resulting in a highly reliable termination section. Obtainable.

Further, since no special processing is required, the work is simple and easy.

As described above, the CV cable termination part of the present invention has the effect of improving electrical performance without causing wrinkles in the reinforcing paper under the bell mouth when the bell mouth is used to alleviate the electric field of the termination box. be.

[Brief explanation of drawings]

The figure is a sectional view of a main part of an embodiment of the C■ cable termination part of the present invention. 1...CV cable, 2...conductive pull-out rod, 3...mold stress cone, 4...
... Polyolefin sheet, 5 ... Bellmouth-shaped mold reinforcement, 6 ... Semiconductive layer.

Claims (1)

[Claims] 1. In a case where a bellmouth-shaped molded reinforcement is used to alleviate the electric field at the terminal end of a cross-linked polyethylene insulated cable cable, a molded stress cone is molded on the cable insulator using polyolefin containing a crosslinking agent, which is the same material as the cable insulator, and the molded stress cone is A polyolefin sheet is wrapped around the outer circumference of the stress cone, a bellmouth-shaped molded reinforcing body made of polyolefin, which is the same material as the cable insulator, is inserted around the outer circumference of the polyolefin sheet, and the no-mold stress cone and the opposite side of the conductor pull-out rod are inserted. A terminal part for a cross-linked polyethylene insulated capeple, characterized in that a polyolefin semiconductive sheet is wound between the inclined surfaces of a Hibelmouth-shaped mold reinforcement to form a semiconductive layer.