JPS5836193Y2 - Cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connecting portion of an oil-filled cable cable having a refrigerant pipe therein through which a refrigerant such as oil different from the cable conductor insulating oil flows.

This type of power cable pulls the refrigerant out of the cable every certain section, dissipates heat with a radiator to cool the refrigerant, and then introduces the refrigerant into the cable again to improve cooling efficiency.

Since it is difficult to provide such a refrigerant inlet/outlet in the middle of the cable in terms of cable manufacturing, it is preferable to provide the refrigerant inlet/outlet at the connection portion of the cable.

In the prior art, the refrigerant inlet/outlet and the refrigerant pipe were communicated with each other by a refrigerant communication pipe that penetrated the inside of the sleeve in the connection part, so the structure was extremely complicated and the cable connection work was inefficient and uneconomical.

An object of the present invention is to provide a cable connection portion having a refrigerant inlet/outlet that can communicate the refrigerant inlet/outlet with a refrigerant pipe with an extremely simple structure.

The embodiments of the present invention will be described in detail with reference to the drawings.
The figure shows the upper half of the cable connection part 10 according to the present invention,
The two oil-filled capacitors 12.12' are connected to the refrigerant pipes 14.1.
A cable conductor 16° 16' twisted around the outer circumference of 4', an insulator 18, 18' provided around it, and a jacket 20, 20' provided further around it via an insulating oil passage.
For this reason, the connecting ends of these power cables 12.12' are stripped in stages to expose the insulation 9718.18', the cable conductor 16.16', and the refrigerant pipe 14.14' in this order.

The connecting conductor 22 has a partition wall 22 in the middle so as to have an H-shaped cross section.
This connecting conductor is fitted into the exposed end of the refrigerant pipe 14.14' of the power cable 12.12', and both ends thereof are connected to the exposed ends of the cable conductor 16.16'. It is connected to the weld part 24.24'.

The outer tube 26 is the jacket 20.2 of the power cable 12.12'.
Two auxiliary pipes 28, 28' are connected to the auxiliary pipe 28, 28' in a lead-like manner and the two auxiliary pipes 28.
two flanges 30, 30' and flanges 30, 30'
It is hollowed out from the outer tube body 32 which is attached in a sealed manner therebetween.

The first inner and outer partition pipes 34 and 36 are arranged concentrically to surround the connecting end of the power cable 12, and the second inner and outer partition pipes 34' and 36' surround the connecting end of the power cable 12'. These inner and outer partition tubes 34, 36, 34', 36' are arranged concentrically so as to surround them, and have exactly the same dimensions (same shape) and are made from a tapered epoxy sleeve whose diameter becomes smaller toward the connecting conductor 22. There are inner and outer partition tubes 34 and 36.
, 34' and 36' are arranged offset in the axial direction.

An inward flange 34 a is provided at the small diameter end of these partition tubes.
, 36a, 34'a, 36'a, and an outwardly facing flange 34b, 36b, 34' at the large diameter end.
b, with 36'b.

The inward flanges 34a and 36a and 34'a and 36'a of the partition tubes 34 and 36 and 34' and 36' are provided with gaskets on the outer periphery of the connecting conductor 22 on both sides of the portion corresponding to the partition wall 22a) 38. 38', and the outward flanges 34b and 36b and 34'b and 36'b are connected by an auxiliary ring 40.40' between the outer tube body 32 and the flange 30.30'. connected in a liquid-tight manner.

In this way, refrigerant passages 42 and 42' are formed between the first inner and outer partition tubes 34 and 36 and between the second inner and outer partition tubes 34' and 36', respectively, through which the refrigerant is taken in and taken out.

The connecting conductor 22 has communication holes 44.44 on both sides of the partition wall 22a on its outer periphery for communicating the refrigerant passage 42.42' and the refrigerant pipe 14.14' of the power cable 12.12', respectively.
', and the auxiliary ring 40.40' has a refrigerant passage 42.
．． A refrigerant outlet 46 and a refrigerant inlet 4 respectively communicating with 42'
6'.

The refrigerant outlet 46 is connected to the inlet of a radiator, also not shown, via a pipe, not shown, and the outlet of the radiator is connected to the refrigerant inlet 46', via a pipe, not shown.

Therefore, the refrigerant in the refrigerant pipe 14 of the power cable 12 flows through the communication hole 44 of the connecting conductor 22, the refrigerant passage 42, the refrigerant outlet 46,
The refrigerant is led to the radiator through the pipe, and cooled by the radiator is led into the refrigerant pipe 14' of the power cable 12' through the pipe, refrigerant inlet 46', refrigerant passage 42' and communication hole 44'.

The connecting conductor 22 is shielded by a shielding tube 48 provided between the first and second external bulkhead tubes 36, 36', and on top of the shielding tube 48, an insulating oil-impregnated paper is wrapped across the outer bulkhead tubes 36, 36'. 50 is insulated and reinforced.

In addition, the external tube main body 32 includes partition tubes 34.34' and 36.3.
6', the shield cylinder 48, and the insulating oil-impregnated paper 50 are attached, and then the auxiliary rings 40 and 40' are attached between them.

Further, in FIG. 1, reference numerals 52 and 52' indicate bell mouths for relaxing the electric field.

FIG. 2 shows that the first inner and outer partition tubes 34,36 have different shapes, and the ends of these partition tubes 34,36 opposite to the connection conductor 22 are liquid-tightly connected to the flange 30, and the refrigerant is Another embodiment of the invention is shown in which an outlet 46 is provided in this flange.

Although not shown, the second inner and outer partition tubes are connected to the flange 30' in exactly the same manner, and the refrigerant inlet 46' is provided in this flange 30'.

According to the present invention, as described above, the refrigerant inlet/outlet can be formed simply by arranging the first and second inner and outer partition tubes so as to respectively surround the connection ends of the two electric cables. Assembling the cable connection part is easier than when the refrigerant communication pipe is placed inside the jacket pipe, and the refrigerant inlet/outlet can be provided at any position on the circumference of the external pipe, making it easy to set the extraction position. Furthermore, since refrigerant cooling can be easily performed, it has the practical benefit of improving cooling efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view showing only the upper half of the cable connection part according to the present invention, and FIG. 2 is an enlarged sectional view of a part of another embodiment of the present invention. 10...Cable connection part, 12.12'...
...Oil-filled power cable, 14.14'...Refrigerant pipe, 16.16'...Cable conductor, 20.
20'... Outer sheath, 22... Connection conductor,
22 a... Bulkhead, 24.24'...
Welded part, 26...External tube, 34.34'...
...First internal partition tube, 36.36'...First and second external partition tube, 42.42'...Refrigerant passage, 44.44'... ...Communication hole, 46°46'
...Refrigerant inlet/outlet.

Claims (3)

[Scope of utility model registration request] (1) A connecting conductor that connects the cable conductors of two power cables, each having a refrigerant pipe inside which refrigerant flows, and an external pipe that surrounds the connecting conductor and is connected to the outer sheath of the two power cables. In the cable connection part, the connecting conductor is composed of a tubular body having a partition wall in the middle and terminating the refrigerant pipes in the two electric cables, and is arranged concentrically in the outer tube so as to surround the connecting end of one of the electric cables. A first inner and outer partition tube arranged in the first and second inner and outer partition tubes and a second inner and outer partition tube arranged concentrically so as to surround the connecting end of the other electric cable are provided. Opposite ends of the partition tubes are connected in a fluid-tight manner to the outer periphery on both sides of the portion corresponding to the partition of the connection conductor, and first and second inner and outer partitions are provided on both sides of the partition of the connection conductor. It has a communication hole that communicates the two refrigerant passages between the sections and the refrigerant pipes of the two electric cables, and the other end of the first and second inner and outer partition tubes is liquid-tightly connected to the outer pipe. a cable connection part connected to the external tube, the external pipe having a refrigerant outlet and a refrigerant port respectively communicating with the two refrigerant passages; (2) The cable connection portion according to claim 2, wherein the first and second inner and outer partition tubes are tapered to have a smaller diameter toward the end on the connection conductor side. (3) The cable connection section according to claim 2, wherein the first and second inner and outer partition tubes are formed to have the same dimensions, and the inner and outer partition tubes are arranged offset in the axial direction.