JPS5846936B2 - 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 embodiments, in which 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 is slightly larger than that of the conductor E.

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

Reference numeral 3 denotes an extensible tube attached to the tip of the insulator tube 2, and the tip 4 is welded to the outer periphery of the pipe conductor 1, making it airtight.

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 portion 8 is connected to the lower metal fitting 9 fixed to the lower end of the insulated pipe 2. It is clamped and fixed between the coupling fitting 10 to be connected to the capeple A and is in an airtight state.

Reference numeral 11 denotes an airtight chamber formed between the porcelain tube 2 and the pipe conductor 1 by forming the upper and lower portions of the porcelain tube 2 into an airtight structure using the expandable tube 3 and the insulating support 5 as described above.

12 is a cylindrical body, and in the embodiment shown in FIG. and attach the cylinder 12.

Of course, the cylindrical body 12 may be directly connected to the tip 15 of the pipe conductor 1 by welding.

16 is a terminal hermetically welded to the open upper end 12' of the cylindrical body 12, and has a flat plate shape with three conductor connection sleeves 18 in contact with the lower part of the circular base plate 17 and a through hole 19 formed in the upper part. A terminal 20 is provided protrudingly.

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

Next, the insulating paper G is wound over the insulating support 5 and the insulating layer, and after grounding, the connecting fitting 10 is connected to the protective layer B with a lead wire, plastic, tape winding, etc. 21.

On the other hand, the tip H of the conductor E protruding from the tip 14 of the pipe conductor 1 is made to protrude above the cylindrical body 12 attached to the pipe conductor 1, and each core wire (■) is inserted into the conductor connection sleeve 18 with an extra length, This is fixed by crimping or soldering, and then the cylindrical body 12 and the board 17 of the terminal 16 are connected as shown in FIG.
The airtight chamber 22 is formed by welding as shown in FIG.

After doing this, an insulating medium such as gas or oil may be filled into the airtight chamber 11 through the filling port 23 provided in the lower metal fitting 9.

As described above, in the present invention, an airtight chamber 11 is formed between the pipe conductor 1 and the insulator tube 2, and since this airtight chamber 11 is completely separated from the electric cable A by the insulating support 5, the airtight chamber 11 and the insulating medium in the power cable A do not interact with each other, so that the airtight chamber 11 can be filled with a different type of insulating medium than the insulating medium in the power cable A. As a result, for example, disaster prevention From the above point of view, it is very convenient to seal gas in the airtight chamber 11 when the power cable A is an OF cable, or to fill oil when it is a Cv cable.

Furthermore, by separating the airtight chamber 11 from the power cable A, it is possible to take in and out the insulating medium, adjust the pressure, etc. separately, and this is convenient for repairs in the event of a breakdown.

Furthermore, since the pipe conductor 1 and the insulator tube 2 are connected through the expansion tube 3, the chain tube 3 absorbs the thermal expansion and contraction of the pipe conductor 1, which is made of metal, and prevents the destruction of the insulator tube 2, which cannot follow the thermal expansion and contraction. It can be prevented.

Furthermore, in the present invention, a cylinder 12 is airtightly attached to the tip of the pipe conductor 1, and a conductor connection sleeve 18 is provided at the open upper end of the cylinder 12 to protrude downward from the substrate 17, and a terminal 20 is protruded upward. The board 17 of the installed terminal 16 is connected to the second
Since the installation is airtight as shown in Figures 3 and 3, even if the insulating medium in the power cable A enters into the pipe conductor 1 from its lower end 24, it will not leak to the outside. There is no need to seal the lower end 24 by welding or crimping to the conductor E to prevent the insulating medium in the power cable A from flowing into the pipe conductor 1, and therefore the pipe conductor 1 and the conductor E are insulated. The following various defects caused by welding or crimping in the vicinity of the support 5 do not occur.

(a) The insulating support 5 made of plastic or the like is damaged by the heat during welding.

(b) In order to eliminate the drawbacks of (a), the insulating support 5 must be cooled, which impairs workability.

(c) In crimping, the temperature will rise in the case of large capacity (large current) or forced cooling.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of the right half showing the constituent members of the device according to the present invention, Fig. 2 is a partial longitudinal cross-sectional view showing an example of the use of the device according to the present invention, and Fig. 3 is a state in which the core wire is attached. FIG. 1...Pipe conductor, 2...Insulator pipe, 3.
...Extendable tube, 5...Insulating support, 11.
...Airtight chamber, 12... Cylindrical body, 16...
...Terminal, 17... Board, 18...
...Conductor connection sleeve, 20...Terminal.

Claims (1)

[Claims] 1 Consists of a pipe conductor into which the conductor end exposed from the cable insulator 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. In the electric cable termination device, 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 tube. A cylinder is airtightly attached to the tip of the pipe conductor, and a sleeve for connecting the conductor is provided at the open upper end of the cylinder to protrude downward from the board, and a terminal is provided to protrude upward to airtightly connect the board. Installed electric cable termination device.