JPS5846935B2 - power cable termination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric cable termination device that constitutes the termination part of electric cables such as OF cables, GF cables, and C■ cables.

The present invention will be described in detail below based on the illustrated embodiment. 1 is a pipe conductor, into which the end of the conductor E exposed by peeling off the protective layer B and shielding layer C1 of the electrical cable A is inserted. Therefore, the inner diameter of the conductor E is slightly larger than the outer diameter.

A porcelain tube 2 is arranged concentrically around the outer periphery of the pipe conductor 1 to surround the conductor 1.

3 is an extensible tube attached to the tip of the insulator tube 2, and the tip 4 is hermetically welded to the outer periphery of the pipe conductor 1.

Reference numeral 5 denotes an insulating support made of an insulating material such as plastic, whose inner circumferential surface 6 is closely fixed to the outer circumferential surface 7 of the pipe conductor 1, and whose outer circumferential surface 8 is connected to a lower metal fitting 9 attached to the lower end of the insulated pipe 2. It is airtightly clamped and fixed between the continuous metal fitting 10 to be connected to the electric cable A.

Reference numeral 11 denotes an airtight chamber formed between the porcelain tube 2 and the pipe conductor 1 by making the upper and lower portions of the porcelain tube 2 airtight with a telescopic tube 3 and an insulating support 5.

To use this device, first, as shown in FIG. 2, the end of the conductor E protruding from the insulating layer is inserted into the pipe conductor 1.

Next, the insulating paper F is wound around the insulating layer and the insulating support 5, and then the connecting fitting 10 and the protective layer B inserted therein.
and are connected by lead work, plastic, tape wrapping, etc. 12.

On the other hand, a support 13 is fitted onto the tip 1' of the pipe conductor 1 protruding from the telescopic tube 3, as shown in FIG. Insert the stranded wire G at the end of the conductor E with extra length into the connection sleeve 17 of the connection terminal 18, which has a flat terminal 16 projecting upward and a conductor connection sleeve 17 projecting downward. are fixed by crimping, soldering, etc., and then the disk 1 of the support 13 is fixed.
A cylindrical body 20 is interposed between the connecting terminal 9 and the substrate 15 of the connecting terminal 18, and these three members are welded to form an airtight chamber 21.

After doing so, an insulating medium such as gas or oil may be filled into the airtight chamber 11 through the filling port 22 of the lower metal fitting 9.

As described above, in the present invention, the airtight chamber 11 is formed between the pipe conductor 1 and the insulator 2, and since this airtight chamber 11 is completely partitioned by the insulating support 5, the airtight chamber 11 is The insulator and the insulating medium in the power cable A do not contact or interact with each other, so it is possible to seal in the airtight chamber 11 with a different type of insulating medium from the insulating medium in the power cable A, and as a result, the molded case When pull A is an OF cable, it is convenient to fill gas into the airtight chamber 11 from the standpoint of disaster prevention, or to fill in insulating oil with excellent insulation properties when pull A is a cable.

Furthermore, since the insulating medium can be taken in and out of the airtight chamber 11 and the power cable A, the pressure can be adjusted, etc. separately, it is convenient for repairs in the event of a breakdown.

Furthermore, since the pipe conductor 1 and the insulator tube 2 are connected via the expansion tube 3, this absorbs the thermal expansion and contraction of the metal pipe conductor 1, and prevents damage to the insulator tube 2, which cannot follow the thermal expansion and contraction. can.

If the connecting terminal 18 is attached as shown in FIG. 2, the tip 1' of the pipe conductor 1 will be airtightly connected to the support 13, and since the airtight chamber 21 is formed, the tip end 1' of the pipe conductor 1 will be airtightly connected to the support 13. Even if the insulating medium in the power cable A enters from the lower end 23, it will not leak to the outside.
The lower end 2 of the conductor E is welded or crimped to the end of the conductor E.
3 and to prevent the insulating medium in the electric cable A from flowing into the pipe conductor 1, the ends of the pipe conductor 1 and the conductor E are welded or crimped near the insulating support 5. In order to prevent various defects caused by welding, such as heat during welding being transmitted to the insulating support 5 made of plastic etc. and damaging the support 5, the insulating support 5 is There is no need for cooling, which reduces workability, or a large capacity (large current) in crimping or a temperature rise in forced cooling.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the right half of the device according to the present invention, FIG. 2 is a vertical cross-sectional view of the left half showing an example of use of the device shown in FIG. 1, and FIG.
The figure is an explanatory view showing how the core wires are attached. 1...Pipe conductor, 2...Insulator pipe, 3.
...Extensible tube, 5...Insulating support, 11.
...Airtight room.

Claims (1)

[Claims] 1 Consists of a pipe conductor into which the conductor end exposed from the insulating layer of the electric cable is inserted, and an insulator tube surrounding the pipe conductor, both of which are arranged concentrically, and the tip of the insulator tube is airtightly connected to the pipe conductor by a telescopic tube. The lower end is airtightly connected to the pipe conductor and the electric cable by an insulating support, and this airtight structure forms an airtight chamber for sealing an insulating medium between the pipe conductor and the insulator. Electric power cable termination device.