JPH059134U - Power cable connection - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a connection portion for a power cable in which deterioration of insulation characteristics due to heat cycle is prevented. [Structure] A stress cone 14 is pressed against the taper surface of an insulating block 11, and a ring-shaped stopper 13 is mounted between the insulating block 11 and the tip of the stress cone 14.
The inner surface of the stopper 13 is provided with a taper having substantially the same angle as the taper surface of the insulating block 11, and the inner surface of the stopper 13 is
Connects smoothly with the taper surface of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power cable connection.

[0002]

[Prior art]

 In the prefabricated connection portion of the rubber / plastic insulated power cable, the main body of insulation is the insulating block 1 and the stress cone 4 mounted on the outer periphery of the cable insulating layer 5, as shown in FIG. The insulating property of this connection portion is exhibited only when the stress cone 4 is brought into contact with the insulating block 1 while maintaining an appropriate pressure. In order to maintain the insulating property of this connecting portion, a constant pressure is applied to the contact interface between the stress cone 4 and the cable insulating layer 5 and the insulating block 1 by pushing the metal fitting 7 with the spring 6. By the way, when the stress cone 4 is compressed by the spring 6 as described above, the tip portion of the stress cone 4 projects toward the conductor connecting portion side (left side in FIG. 2) due to the heat cycle. If this protrusion is large, the spring 6 will stretch and a predetermined force cannot be obtained, and the interfacial surface pressure will be insufficient, causing dielectric breakdown. Therefore, at the connection portion of 66 to 77 KV class, a ring-shaped stopper 3 is provided to prevent the stress cone 4 from protruding.

[0003]

[Problems to be solved by the device]

 However, if you try to prevent the stress cone from sticking out with the stopper as described above, there is a problem that the stress cone buckles due to the heat cycle (see the dotted line), and the surface pressure between the stress cone and the cable insulation layer becomes insufficient. It was Therefore, as shown in FIG. 3, without attaching a stopper, the free end of the stress cone 4 on the conductor connection side is extended, and the taper part of the insulating block 1 is extended so that the protruding part of the stress cone 4 is inside the taper part. Some have a structure that can be stored. However, in this case, the gap t between the cable insulating layer 5 and the insulating block 1 becomes small. In the case of a prefabricated connection, if the distance t between the cable insulating layer 5 and the insulation block 1 becomes small, there is a problem that it is difficult to connect the conductor connection pipe and the insulation block when assembling the prefabricated connection. It was

[0004]

[Means and actions for solving the problem]

 The present invention provides a connection portion for a power cable that solves the above problems. A stress cone is pressed against the taper surface of an insulating block, and a ring-shaped stopper is provided between the insulating block and the tip of the stress cone. The inner surface of the stopper at the connection portion for the power cable in which the is attached has a taper at substantially the same angle as the taper surface of the insulating block. In the power cable connecting portion having the above-mentioned structure, even if the stress cone projects toward the conductor connecting side, it projects along the inner surface of the stopper, so that buckling does not occur and no insulation problem occurs. Moreover, a sufficient gap can be secured between the insulating block and the cable insulating layer.

[0005]

【Example】

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view of an embodiment of a power cable connecting portion according to the present invention. In the figure, 11 is an insulating block, 13 is a stopper, 14 is a stress cone, 5 is a cable insulating layer, 6 is a spring, and 7 is a metal fitting. The taper portion of the insulating block 11 forms an angle θ ₁ . The stopper 13 has a ring shape, and the inner surface thereof has a taper of an angle θ ₂ . Set θ ₂ to be equal to θ ₁ . When the stopper 13 is attached, the inner surface of the stopper 13 forms an angle θ ₂ with the cable insulating layer 5 and is smoothly connected to the tapered surface of the insulating block 11. In this case, the protruding portion 18 of the stress cone 14 due to the heat cycle protrudes along the inner surface of the stopper 13 and does not adversely affect the insulation characteristics. Needless to say, the shape of the stopper is not limited to the above embodiment.

[0006]

[Effect of the device]

 As described above, according to the present invention, since the inner surface of the stopper has a taper at substantially the same angle as the taper surface of the insulating block, it is possible to prevent buckling of the stress cone and prevent deterioration of the insulation characteristics. It has an excellent effect that it can be done.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a power cable connecting portion according to the present invention.

FIG. 2 is a cross-sectional view of a conventional power cable connecting portion with a stopper.

FIG. 3 is a cross-sectional view of a conventional power cable connector without a stopper.

[Explanation of symbols]

 1, 11 Insulation block 3, 13 Stopper 4, 14 Stress cone 5, Insulation layer 6 Spring 7 Push metal fitting 18 Protruding part

Claims (1)

[Claims for utility model registration] [Claim 1] At a connection portion for a power cable in which a stress cone is pressed against the taper surface of the insulating block, and a ring-shaped stopper is mounted between the insulating block and the tip of the stress cone. , The inner surface of the stopper has a taper at substantially the same angle as the taper surface of the insulating block, which is a connecting portion for a power cable.