JPH0117097Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a power cable terminal connection part, and in particular, the power cable terminal connection part has improved contamination characteristics by improving the terminal cover that hides the live part of the hollow insulation reinforcement. Regarding.

Generally, a terminal cover at the end of a power cable is used to hide the live part of the plug-in terminal connection and to ensure the safety of workers.

However, as shown in FIG. 1, the conventional terminal cover 2 has a gap 3 in the upper part of the hollow insulation reinforcement
For example, if this is installed on soiled ground with a degree of contamination (amount of salt adhesion) of 0.05 mg/cm ² or more, the gap 3 at the lower end of the terminal cover 2
There was a problem in that the tip of the hollow insulating reinforcing body 1 was contaminated as shown by the broken line due to contaminants entering the structure, resulting in flashover occurring along the path shown by the broken line.

Therefore, power cable terminations of this type were used exclusively in non-contaminated areas, and insulator type terminations were used in contaminated areas.

The present invention was developed based on the above circumstances, and the terminal cover is made of a rubber-like elastic body, and the inner periphery of the lower end thereof is provided with a sufficient creepage distance to prevent flashover at the tip of the hollow insulation reinforcement. The object is to provide a power cable termination connection which can be used even in polluted areas due to its elastic close contact.

Hereinafter, the present invention will be explained based on the drawings of one embodiment. The second figure has the same numbers attached to the same parts as in Figure 1.
In the figure, the power cable termination connection part according to the present invention includes a terminal main body 1, a lead wire 5 connected to a connection terminal 4 embedded in the center of the upper part of the main body, and a lead wire 5 that covers the outer periphery of the connection part and has a lower end. It mainly consists of a cylindrical elastic terminal cover 6 fitted onto the upper part of the terminal main body 1.

The terminal main body 1 consists of a connecting body 7 and a cable terminal portion 8 inserted into the connecting body 7.

The connecting body 7 is made of ethylene propylene rubber (hereinafter referred to as
A hollow insulating reinforcing body 9 having a cylindrical upper end 9a formed of an elastic insulating material such as EP rubber and having a creepage distance h with which the elastic terminal cover 6 is pressed into contact with the elastic terminal cover 6 sufficient to prevent flashover; A connecting terminal 4 embedded in the upper end portion 9a and having a conductor insertion hole 10 at the lower end, and the hollow insulation reinforcing body 9 at the bottom end.
It mainly consists of a stress cone 11 made of semiconductive EP rubber or the like and integrally molded with a stress cone 11 made of semiconductive EP rubber or the like.

The cable terminal part 8 is made of a rubber or plastic insulated cable, and the end part is stripped in steps to form a conductor 12, an insulator 13, an outer semiconducting layer 14 and a shielding layer 15.
are each exposed.

However, the cable terminal portion 8 subjected to the step-stripping process is
The conductor 12 is inserted into the connecting body 7 so as to fit into the conductor insertion hole 10 of the connecting terminal 4, and the cable sheathing layer 15 and the stress cone 11 are electrically connected at the lower end.

The lead wire 5, whose one end is connected to a switch (not shown), is composed of a so-called high-voltage underline wire, etc., consisting of a conductor 16 and an insulator 17 made of cross-linked polyethylene or the like coated on the outer periphery by extrusion. There is.

The conductor 16 of the lead wire exposed by peeling off the steps is fitted into the vertical groove 17a of the connecting terminal 4 whose upper part is flat as shown in FIGS.
It is tightened and fixed via bolts and nuts 19a and 19b.

Note that the connection of the lead wires is not limited to that shown in FIGS. 3a and 3b, and may be connected, for example, through relay terminals (not shown) having conductor insertion holes at both ends.

The elastic terminal cover 6 also includes a large cylindrical portion 6a having an inner diameter slightly smaller than the outer diameter D of the cylindrical upper end portion 9a of the hollow insulating reinforcing body 9, and an insulator for the lead wire 5 provided at one end of the large cylindrical portion 6a. It consists of a small cylindrical part 6b with a slightly larger inner diameter, and the whole is integrally molded from an elastic insulating material such as EP rubber.

In the figure, 21 is a ground lead wire, 22 is a cable sheath, 23 is a semiconductive tape winding layer, 24 is a sealing portion, and 25 is a bracket.

As described above, in the present invention, the lower end of the elastic terminal cover is connected to the cylindrical upper end 9 of the hollow insulation reinforcement.
Since the required creepage distance h, which is sufficient to prevent flashover, is tightly fitted to A with surface pressure, the upper part of the hollow insulating reinforcing body is not contaminated as in the conventional case, and no flashing due to contamination occurs. Tush over can be completely prevented.

Therefore, the power cable terminal connection part of the present invention can be installed even in polluted areas, thereby expanding its range of application.

Furthermore, since the power cable terminal connection section of the present invention is cheaper than an insulator type terminal, it is economically advantageous to install it in a polluted area.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway explanatory diagram of a conventional power cable terminal connection section, Fig. 2 is a partially cutaway sectional view of the power cable terminal connection section of the present invention, and Fig. 3a is a top view of the connection terminal. b is its side view. 1... Terminal body, 4... Connection terminal, 5... Lead wire, 6... Elastic terminal cover, 7... Connection body,
7'... Connected object, 8... Cable terminal section, 9...
...Hollow insulation reinforcement, 11...Stress cone, 1
2... Cable conductor, 16... Lead wire conductor.

Claims (1)

[Scope of utility model registration request] A hollow insulation reinforcing body with a cylindrical tip end is fitted onto the cable insulator of the stripped power cable terminal, while a lead wire having an insulator is connected to the cable conductor via a connecting terminal. , an elastic terminal consisting of a large cylindrical part with an inner diameter slightly smaller than the cylindrical part at the tip of the hollow insulation reinforcing body, and a small cylindrical part with an inner diameter slightly larger than the insulator of the lead wire provided at one end of the large cylindrical part. cover,
The large cylindrical portion has a creepage distance sufficient to prevent flashover and is tightly fitted to the cylindrical portion at the tip of the hollow insulating reinforcing body with surface pressure, and the small cylindrical portion is tightly fitted to the cylindrical portion at the tip of the lead wire. A power cable terminal connection part, characterized in that it is fitted over an insulator so as to be covered therewith, and seals between the small cylindrical part of the elastic terminal cover and the lead wire.