KR20180038854A - Dead end test equipment for power cable - Google Patents

Abstract

The present invention relates to an end test device for a power cable, and more particularly, to a device for testing a cable terminal, which is coupled to a cable terminal including a central conductor to evaluate characteristics of the cable terminal. The end test device for a power cable comprises: a connection conductor unit having one end thereof included in a cable terminal, and receiving a voltage applied; an insertion unit having the other end of the connection conductor unit to be inserted and coupled thereto, and formed with a conductor for receiving the voltage from the cable terminal; and a dead-end unit formed of an insulating material surrounding the insertion unit to allow a region where the insertion unit is exposed, to which the voltage is transferred, to be maintained in an insulating state at a fluid interface. Accordingly, since a cable for connecting a test device and a terminal is not required or a cable having the minimum length is used, it is possible to reduce the waste of cables. In addition, the test device and the terminal are directly coupled to each other to simply test voltage withstand and electrical insulation performance, and a test can be conducted with an internal voltage facility having a smaller capacity as compared to conventional test devices, thereby minimizing test unit costs, test facility costs, and test facility areas.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an end-

The present invention relates to an end portion testing apparatus for a power cable, and more particularly, to an end portion testing apparatus for a power cable, which does not require a cable for connecting a test apparatus such as a dead end, Thereby reducing the waste of the cable.

Terminals for power cables, such as superconducting cables, paper insulated cables, and plastic insulated cables, are generally connected to power transmission devices such as general transmission lines or GIS, transformers, etc., Refers to a device that connects the power cable. For example, in the case of a terminal device for a superconducting cable among the power cable terminal devices, a connection is made between a current lead disposed at room temperature and a superconducting cable disposed in a cryogenic coolant tank. 1, the basic structure of a terminal device 10 for a superconducting cable includes a room temperature section 11 filled with insulating oil or insulating gas, a current lead 12 connected to the room temperature section 11, A connecting portion 15 for connecting the current lead 12 and the superconducting cable 14 to each other within the joint portion between the room temperature portion 11 and the cryogenic temperature portion 13, And a solid insulated bushing 16 formed on the outer surface of the base body 16.

Such terminal equipment for cables is used not only as a superconducting cable but also as an insulation cable or a plastic insulated cable, by measuring electrical characteristics such as withstand voltage, partial discharge and electrical insulation performance before applying a cable terminal device to a product It is necessary to check whether it meets the following criteria. Therefore, it is possible to test a terminal apparatus for a cable only by connecting an apparatus for testing the electrical characteristics of the terminal apparatus for the cable to the end of the cable extending from the terminal apparatus for the cable. The end portion testing device 30 for a typical superconducting cable includes an insulating member 32 coupled to an end of an outwardly extending cable 31, a connecting portion 33 connecting the cable 31 and the insulating member 32, And a chamber 34 in which the connection part 33 and the insulation member 32 are formed and the connection part 33 and the insulation member 32 are filled with the refrigerant.

However, these end-of-cable test apparatuses are inserted into cables terminal and end-end test apparatus by inserting cables, respectively, and after the characteristics are tested, the cables can not be reused and are disposed of. Therefore, since the cable is wasted every time a terminal device for a cable is tested, the manufacturing cost is increased. In addition, there is a disadvantage in that a space for a test including a cable length is required because a structure in which a cable is inserted and connected to a terminal device for a cable and a testing device, respectively, is formed as a separate structure.

Korea Patent Office Registration No. 10-0939733 Korea Patent Office Registration No. 10-1238141 Korea Patent Office Registration Utility Utility Model No. 20-0247347

It is therefore an object of the present invention to provide an end tester for a power cable which does not require a cable connecting between the end tester and the terminal or which can reduce the waste of the cable by using a cable having the minimum length.

It is also intended to provide an end portion testing device for a power cable which can directly test the withstand voltage and electrical insulation performance by directly coupling the end portion testing device and the terminal.

In addition, the present invention provides an end test apparatus for a power cable capable of minimizing the test unit cost, the test equipment cost, and the test equipment area by testing with a withstand voltage equipment having a smaller capacity than the conventional end equipment.

The above object is achieved by a cable end tester coupled to a cable terminal including a center conductor for evaluating characteristics of the cable terminal, the cable end tester comprising: A body part; An insert part having a conductor connected to the other end of the connection conductor part by being inserted therein and receiving a voltage from the cable terminal; And a dead end portion made of an insulating material surrounding the insert portion so that an area where the insert is exposed to the voltage is maintained in an insulating state at the fluid interface .

Here, it is preferable that the connection conductor portion and the insert portion are directly connected without a separate connection cable.

The reinforcing insulation portion may be formed of an epoxy, a polypropylene laminated paper (PPLP), or a kraft paper. The reinforcing insulation portion may be formed of an epoxy, a polypropylene laminated paper or a kraft paper. .

And a fluid storage part for storing a fluid for cooling or insulating the terminal for the cable and the dead end part, wherein the terminal for the cable is exposed to the fluid stored in the fluid storage part, A refrigerant for cooling the cable terminal, an insulating oil for insulating the cable terminal, or an insulating gas.

Both ends of the connection conductor body include a screw thread, and are preferably bolted-nut connected to the center conductor or the insert portion including a thread.

And a sleeve portion between the central conductor and the insert portion, wherein the inner surface and the outer surface of the sleeve portion include threads, and the connecting conductor body including the threads and the bolt-nut combination Or the outer surface of the sleeve portion may include threads, and may be bolted-nut-coupled to the insert portion including threads, and may be press-coupled with the connection conductor portion.

It is preferable that the connection conductor portion and the insert portion are made of any one of copper (Cu), copper alloy, aluminum (Al), and an aluminum alloy material, and the dead end portion is made of an epoxy material.

The cable terminal includes: a center conductor having one end connected to an external cable and the other end connected to a superconducting cable; And a solid insulation bushing formed on the outer surface of the center conductor, wherein the solid insulation bushing is connected to the inside of the solid insulation bushing to form a high-voltage insulation path, and a coolant for cooling the center conductor is supplied And a coolant circulation path for forming the heat conduction portion on the center conductor side by cooling through heat exchange.

According to the configuration of the present invention described above, it is possible to reduce the waste of the cable by using a cable that does not require a cable connecting between the end test apparatus and the terminal or has a minimum length.

In addition, it is possible to test the withstand voltage and electric insulation performance simply by connecting the end test equipment and the terminal directly, and also it is possible to test with the withstand voltage equipment with a smaller capacity than the conventional test equipment, The area can be minimized.

1 is a cross-sectional view of a cable end test apparatus according to the prior art,
2 and 3 are sectional views of an end portion testing apparatus for a superconducting cable according to the first embodiment,
Figs. 4 and 5 are sectional views of an end portion testing device for ground wire insulated cable according to the second embodiment,
6 and 7 are sectional views of an end portion testing apparatus for a plastic insulated cable according to a third embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 7, the power cable end test apparatus 100, 300, 500 includes a terminal 200 for a superconducting cable, a terminal 400 for a paper insulated cable, And a plastic insulated cable terminal 600, and the state applied to each terminal will be described in detail with reference to the drawings.

2 and 3 show a cable end test apparatus 100 combined with a terminal 200 for a superconducting cable and a terminal 200 for a superconducting cable so that the terminal 200 for a superconducting cable according to the first embodiment can be tested Fig. A terminal 200 for a superconducting cable is a terminal having one end coupled to an external cable and the other end coupled to a superconducting cable. The cable end test apparatus 100 according to the present invention includes a terminal 200 for a superconducting cable The cable end test apparatus 100 is inserted. That is, in order to test the terminal 200 for the superconducting cable, the cable end test apparatus 100 is directly connected to the area where the superconducting cable is coupled without using the superconducting cable, so that the superconducting cable is wasted Can be reduced.

Here, the terminal 200 for a superconducting cable generally includes a center conductor 210 connected to an external or external cable to which a voltage is externally applied. The center conductor 210, the center conductor 210, And a solid insulated bushing 220 formed on the outside of the body. That is, one end of the center conductor 210 is disposed at room temperature and connected to external devices, and the other end of the center conductor 210 is connected to the terminal 200 for a superconducting cable. Although the central conductor 210 is connected to the end of the superconducting cable that is not coupled to the external cable, it is not connected to the superconducting cable when the terminal 200 for the superconducting cable is tested through the cable end test apparatus 100 of the present invention . Here, the center conductor 210 exists in a state where it is installed in the room temperature part 230 filled with insulating oil.

The solid insulation bushing 220 includes a center conductor 210 inside and is formed to surround the center conductor 210 so that a part of the center conductor 210 is insulated. This solid insulation bushing 220 is formed for insulation and exists not only for insulation but also for protecting the center conductor 210 from external impact. The solid insulation bushing 220 has a columnar shape surrounding the center conductor 210, and both ends are formed so as to gradually decrease in diameter. The solid insulation bushing 220 may be made of epoxy, polypropylene laminated paper (PPLP), or a mixture thereof.

The end portion testing apparatus 100 for a superconducting cable inserted into an area where a superconducting cable is connected to a terminal for a superconducting cable 200 to evaluate characteristics of the terminal 200 for a superconducting cable includes a connecting conductor unit 110, 120 and a dead end unit 130. [

One end of the connection conductor unit 110 is connected to the center conductor 210 included in the terminal 200 for a superconducting cable and receives a voltage applied to the center conductor 210. For this, the conductive material is made of conductive material. The most preferable material is copper (Cu), copper alloy, aluminum (Al) or aluminum alloy, and other metals may be used. One end of the connecting conductor portion 110 includes a threaded portion. In this case, the end portion of the center conductor 210 is connected to the center conductor 210 coupled to one end of the connecting conductor portion 110, It is preferable that an even thread is formed. The connecting conductor body 110 is formed in a bolt shape having a thread on the surface so that the center conductor 210 and the connecting conductor body 110 can be bolt-nut-coupled. The center conductor 210 has a threaded nut Shape. So that the connection conductor portion 110 can be screwed to the center conductor 210.

An insert portion 120 is coupled to the other end of the connection conductor portion 110 connected to the center conductor 210 at one end. The insert portion 120 is preferably made of a conductor so that the other end of the connection conductor portion 110 is inserted and coupled to the connection conductor portion 110 and the voltage from the center conductor 210 can be transmitted through the connection conductor portion 110 . The insert portion 120 is a component to which an externally applied voltage is finally transferred, and is located at the most distal end so as not to transfer the voltage to another configuration. The insert portion 120 has a diameter larger than the diameter of the connection conductor portion 110 and exists in a shape surrounding the other end of the connection conductor portion 110. At this time, the connection conductor unit 110 and the insert unit 120 are directly connected without a separate connection cable, which is one of the most important features of the present invention.

Here, the diameter of the center conductor 210 and the connection conductor unit 110 varies depending on the capacity of the current. When the current capacity is large, the diameter is large. When the capacity is small, the diameter is small. . Since the insert portion 130 can not be formed differently according to the diameter of the connection portion 110, the connection portion 110 and the connection portion 110 can be formed separately. And may further include a sleeve portion 170 between the insert portions 130. The sleeve portion 170 has a connection conductor portion 110 inserted into the inner surface thereof and a threaded portion formed on the outer surface thereof to form a bolt-nut connection with the insert portion 130. A thread is formed on the outer surface of the sleeve portion 170 and the insert portion 120 is provided with a recess in which the sleeve portion 170 is engaged, Threaded portions are formed in the region so that they can be screwed together. The sleeve portion 170 can determine whether the sleeve portion 170 is installed between the connection conductor portion 110 and the insert portion 130 according to the diameter of the connection conductor portion 110. The sleeve portion 170 may be a coupling screw having a thread formed on the inner surface and the outer surface so that the connection conductor portion 110 and the sleeve portion 170 can be coupled to each other by bolt-nut connection.

The insert part 120 made of a conductor is most preferably made of any one of copper (Cu), copper alloy, aluminum (Al) and aluminum alloy, but is not limited thereto. Particularly, aluminum or aluminum alloy is most suitable because it has similar shrinkage and expansion degree to epoxy.

In this way, the center conductor 210, the connection conductor portion 110, and the insert portion 120 can be firmly coupled without requiring a separate coupling component through a screw connection. In some cases, Elements may be added to perform combining.

The dead end portion 130 surrounding the insert portion 120 is formed so that the end portion of the insert portion 120 to which the voltage is finally transmitted is exposed to the insert portion 120 As shown in Fig. In order to confirm the withstand voltage and insulation characteristics of the terminal 200 for a superconducting cable, the end portion of the end-of-cable testing device 100 must be tested so that it remains in an insulated state. It is preferable that the insert part 120 is wrapped with an insulating material so as not to be exposed. To this end, the dead end portion 130 is formed to completely surround the insert portion 120. In this case, it is preferable to manufacture the dead end part 130 by using the same method as the molding in a state in which the insert part 120 is inserted. In this case, the insert part 120 And the dead end portion 130 are firmly coupled. The dead end portion 130 is preferably made of an epoxy material, which is an insulating material, and may be made of an insulating material such as FRP (fiber reinforced plastics).

A high-voltage insulation path is formed by being connected to the inside of the solid insulation bushing 220 from inside to outside, and a coolant for cooling the center conductor 210 is supplied and cooled through heat exchange, And a refrigerant circulation path for forming an equilibrium portion. This can prevent the problem that the cable end test apparatus 100 is damaged by heat by cooling the heat entering the center conductor 210 and the heat generated from the center conductor 210.

And further includes a reinforcing insulation portion 140 to increase the insulation performance of the upper portion of the insert 120 as well as the dead end portion 130. The reinforcing insulating portion 140 includes the dead end portion 130 and is formed outside the dead end portion 130 and the connection conductive body portion 110 so as to surround the periphery of the connection conductive body portion 110 as well. In this way, the insulation performance can be further increased through the reinforced insulation portion 140. The reinforced insulation 140 may be formed of epoxy, polypropylene laminated paper (PPLP), or kraft paper. The reinforced insulation 140 may be formed of a bent end portion 130 and a periphery of the connection conductive portion 110 Gt; PPLP < / RTI > is most preferred.

In case of superconducting cable, it should be impregnated with refrigerant since it should exist in a cooled state at low temperature. Accordingly, since the terminal 200 for a superconducting cable is also used in a state of being impregnated with a refrigerant, the terminal 200 for a superconducting cable and the end device for testing a cable 100 are also impregnated with refrigerant, Electrical insulation performance can be confirmed. And a fluid storage unit 150 for storing a fluid for cooling the terminal 200 for the superconducting cable and the dead end unit 130. The terminal 200 for the superconducting cable is connected to the fluid stored in the fluid storage unit 150, Lt; / RTI > Here, the fluid is preferably a refrigerant that cools the terminal 200 for a superconducting cable in accordance with characteristics of the terminal 200 for a superconducting cable, and the refrigerant may be liquid nitrogen or liquid helium. Conventionally, since a test device for testing a cable terminal is provided separately from a cable terminal, a fluid storage portion is formed in a terminal for a cable, and a fluid storage portion is separately formed in the end portion testing device for a cable. . In addition, since the fluid storage unit is separately provided, the cable test apparatus has a disadvantage of taking up a large volume. However, in the case of the present invention, since both the terminal 200 for the superconducting cable and the cable end testing apparatus 100 are provided in a single state in the fluid storage unit 150, .

4 and 5 show a cable end test apparatus (hereinafter referred to as a cable end test apparatus) 400 combined with a ground insulation cable terminal 400 and a ground insulation cable terminal 400 so that the ground insulation cable terminal 400 according to the second embodiment can be tested The terminal 400 for a general ground insulation cable is formed in a state where the center conductor 410 is immersed in the fluid storage part 350. An insulation cable is a cable that is insulated by wrapping insulation paper around the outside. Typical insulation cable is an oil-filled cable (OF). The center conductor 410 corresponding to the ground insulation cable is a channel that penetrates the center so that the insulation oil can be drawn into and out of the pressure oil tank when the insulation oil shrinks or expands according to the temperature change, A central conductor body 411 made of a conductor strand and a central conductor insulating part 412 for electrically insulating the central conductor body 411 from the outside. The central conductor insulating portion 412 is configured to remove moisture and air through heated vacuum drying and then fill the insulating oil. In some cases, the central conductor insulating portion 412 may further include a solid insulating portion 430 for alleviating the electric field to be concentrated. Generally, in the ground insulation cable, the solid insulation part 430 most commonly uses a bell mouth, but is not limited thereto.

A cable end test apparatus 300 for testing a ground terminal 400 for a ground insulation cable includes a connection conductor unit 310, an insert unit 320, and a dead end unit 330. The center conductor 410 corresponding to the ground insulation cable of the terminal 400 for ground insulation cable is coupled to the connection conductor unit 310 receiving the voltage applied to the center conductor 410. At this time, the center conductor 410 is surrounded by the insulating paper, and the central conductor body 411 is exposed from the insulator at the end region where the connection conductor unit 310 is coupled to the connection conductor unit 310. The center conductor 410 may further include a conductor coupling part 360 to be coupled to the center conductor body 411 and the connection conductor part 310. The conductor coupling part 360 and the connection conductor part (310) is coupled to transmit the voltage applied to the center conductor (410) to the connection conductor unit (310). Here, it is preferable that the conductor coupling portion 360 is a compression metal.

One end of the connection conductor unit 310 is coupled to the conductor coupling unit 360 and the other end of the connection conductor unit 310 is inserted and coupled to the insert unit 320. The voltage of the center conductor 410 is connected to the connection conductor unit 310 So that it can be transmitted through the conductor. At this time, the connection between the insert part 320 and the connection conductor part 310 can be combined by forming the sleeve part 370 between the insert part 320 and the connection conductor part 310 as in the first embodiment. The inner surface of the insert portion 320 and the outer surface of the sleeve portion 370 are bolted-nut-joined together with threads. The outer surface of the connection conductor portion 310 and the inner surface of the sleeve portion 370 can be bolted to each other in a state of threaded connection or the connection portion 310 can be connected to the sleeve portion 370 After the insertion, they can be joined together by pressing. Here, the sleeve portion 370 is preferably made of copper or a copper alloy material because the sleeve portion 370 can be compressed. When the sleeve portion 370 is made of aluminum or an aluminum alloy material, the aluminum or aluminum alloy, which has been subjected to the pressing process, may break.

The insert part 320 has a diameter larger than the diameter of the connection conductor part 310 and exists around the other end of the connection conductor part 310 to enable such coupling. In some cases, the coupling elements may be added to the coupling portion 360, the connecting conductor portion 310, and the insert portion 320, respectively, so as to perform the coupling.

The dead end portion 330 surrounding the insert portion 320 is electrically connected to the insulation portion 320 surrounding the insert portion 320 so that the region where the insert portion 320 to which the voltage is transmitted is exposed is maintained in an insulating state at the fluid interface. It is made of material. The dead end portion 330 is most preferably made of an epoxy material, but is not limited thereto. The reinforcing insulating portion 340 is formed so as to increase the insulating performance of the dead end portion 330 as well as the upper portion of the insert portion 320, the connecting conductor portion 310, the conductor coupling portion 360 and the center conductor 410 . The reinforced insulation portion 340 includes the dead end portion 330 and the outer surface of the dead end portion 330 and the ground insulation cable terminal 400 so as to surround the periphery of the ground terminal 400 for the ground insulation cable. . Thus, the insulation performance can be increased through the reinforced insulation portion 340.

The center conductor 410 is immersed in the insulation fluid to be insulated for the center conductor 410. The center conductor 410 is immersed in the insulated fluid to insulate the fluid storage part 350 along the shape of the terminal 400 for ground insulation cable and the cable end- . It is preferable that the fluid storage part 350 is formed so that the whole insulation cable terminal 400 can be immersed in the insulation fluid such that the fluid storage part 350 is in contact with the fluid all the way to the area of the central conductor 410 which is the middle insulation cable. Here, the insulating fluid stores either the insulating oil or the insulating gas, and the insulating oil or the insulating gas may be any insulating oil or insulating gas generally used.

Figures 6 and 7 illustrate a cable end test apparatus (600) coupled with a terminal 600 for a plastic insulated cable and a terminal 600 for a plastic insulated cable so that the terminal 600 for a plastic insulated cable according to the third embodiment can be tested 500). A XLPE cable can be used as a typical example of the terminal 600 for a plastic insulated cable. The terminal 600 for a plastic insulation cable includes a center conductor 610, which is a plastic insulation cable, and an insulation oil storage portion 620. The center conductor 610 includes a center conductor body 611 having a conductor having a high conductivity and a center conductor insulation part 612 made of a plastic insulation material to electrically insulate the center conductor body 611 from the outside, . The central conductor insulator 612 may further include a solid insulator 630 for alleviating the concentrated electric field. In the plastic insulator cable terminal 600, a stress cone is most commonly used use.

The cable end test apparatus 500 includes a connection conductor unit 510, an insert unit 520, and a dead end unit 530 to receive a voltage applied to the center conductor 610 of the plastic insulation cable terminal 600 In the third embodiment, the connecting conductor body 510 serves as a sleeve to electrically connect the center conductor 610 and the insert part 520, unlike the first embodiment and the second embodiment. do. One end of the connection conductor body 510, which is connected to the center conductor 610, has a smooth surface, and the other end of the connection conductor body 520 is threaded. Also, a thread is formed in the insert part 520 to perform the bolt-nut coupling between the connection conductor part 510 and the insert part 520. In the case of the connection conductor unit 510 and the center conductor 610 in which the bolt-nut connection is not made, the center conductor 610 is inserted into the connection conductor unit 510 and then the connection conductor unit 510 is compressed . At this time, when the connection conductor unit 510 is squeezed, the outside may not be smooth and unevenness may be generated. For this purpose, the connection conductor unit 510 may surround the outside through a separate connection insulation unit 540.

The third embodiment differs from the first embodiment in that the reinforcing insulation portions 140 and 340 included in the first and second embodiments are not additionally formed and that the insert portion 520 and the dead end portion 530 Silicon grease can be injected into the space to facilitate insulation between the spaces.

In the case of the end portion test apparatus 500 for a plastic insulated cable, a fluid storage portion 550 surrounding the terminal 600 for the plastic insulated cable and the dead end portion 530 is formed. In the case of the end portion test apparatus 500 for a plastic insulated cable, insulating gas is stored in the fluid storage portion 550, and the insulating gas is most preferably dry air free from moisture. In the case of the terminal 600 for a plastic insulated cable, since it is susceptible to moisture, dry air is injected to prevent damage to the terminal 600 for a plastic insulated cable. The cable end test apparatus 500 region including the dead end portion 530 may not be included in the fluid storage portion 550 but may be exposed to the outside. The end portion of the center conductor 610 and the end portion testing device for the cable 500 are formed in a region of the center conductor 610 in which the insulating fluid storing portion 620 for storing the insulating fluid for insulating the center conductor 610 is formed, . Accordingly, the sealing member 640 is disposed between the insulating oil storage part 620 and the center conductor 610 passing through the insulating oil storage part 620 so as not to cause the problem of counting the insulating fluid.

The conventional cable end test apparatuses 100, 300, and 500 of the present invention have a problem that the cables used only in the cable end test are wasted after the test, And the cable terminals 200, 400 and 600 are not required, or a structure in which only a minimum number of cables are used is used, it is possible to reduce the waste of cables. Also, since it is directly coupled to the cable terminals 200, 400 and 600, it is possible to easily test the withstand voltage and the electric insulation performance, and the test unit price and the power cable end test apparatuses 100, 300 and 500 The manufacturing cost can be reduced.

10: terminal device for superconducting cable 11:
12: Current lead 13: Cryogenic part
14: Superconducting cable 15: Connection
16: Solid insulated bushing 30: Cable end test equipment
31: Insulation member
100, 300, 500: Cable end test equipment
110, 310, 510: connection conductor unit 120, 320, 520:
130, 330, 530: dead end 140, 340: reinforced insulation part
150, 350, 550: Fluid storage part 170, 370: Sleeve part
200: terminal for superconducting cable 210, 410, 610: central conductor
220: solid insulated bushing 230: room temperature part
360: conductor coupling unit 400: terminal for ground insulation cable
411, 611: central conductor body 412, 612: central conductor insulation part
430, 630: Solid insulation part 440: Conductor coupling part
540: connection insulation part 600: terminal for plastic insulation cable
620: insulating oil storage part 640: sealing member

Claims (14)

1. An end portion testing apparatus for a power cable, which is coupled to a cable terminal including a center conductor to evaluate characteristics of the cable terminal,
A connection conductor body which receives a voltage applied to one end of the cable terminal;
An insert part having a conductor connected to the other end of the connection conductor part by being inserted therein and receiving a voltage from the cable terminal;
And a dead end portion made of an insulating material surrounding the insert portion so that an area of the insert portion to which the voltage is transmitted is exposed in an insulated state at the fluid interface. The method according to claim 1,
Wherein the connection conductor portion and the insert portion are directly connected without a separate connection cable. The method according to claim 1,
And a reinforcing insulation portion formed on the outside to surround the dead end portion and the periphery of the connection conductor body portion. The method of claim 3,
Wherein the reinforcing insulating portion is formed of epoxy, polypropylene laminated paper (PPLP), or kraft paper. The method according to claim 1,
And a fluid storage portion for storing a fluid for cooling or insulating the cable terminal and the dead end portion, wherein the cable terminal is exposed to the fluid stored in the fluid storage portion. 6. The method of claim 5,
Wherein the fluid is any one of a refrigerant for cooling the cable terminal, insulating oil for insulating the cable terminal, or insulating gas. The method according to claim 1,
Both ends of the connection conductor body including a thread,
And the end portion is bolted-nut-joined to the center conductor or the insert portion including the thread. The method according to claim 1,
Further comprising a sleeve between the center conductor and the insert portion. 9. The method of claim 8,
Wherein the inner surface and the outer surface of the sleeve portion comprise threads,
Wherein the connection conductor body including the threaded portion is bolted-nut-coupled with the insert portion. 9. The method of claim 8,
Wherein the outer surface of the sleeve portion includes threads,
Wherein the insert portion is bolted-nut-coupled to the insert portion including the thread, and is press-coupled with the connection conductor portion. The method according to claim 1,
Wherein the connecting conductor body and the insert portion are made of one of copper (Cu), a copper alloy, aluminum (Al), and an aluminum alloy material. The method according to claim 1,
Wherein the dead end portion is made of an epoxy material. The method according to claim 1,
The cable terminal includes:
A center conductor having one end connected to the external cable and the other end connected to the superconducting cable; And a solid insulation bushing formed on the outside of the center conductor. 14. The method of claim 13,
And a coolant circulation path connected to the inside of the solid insulation bushing to form a high-voltage insulation path, and a coolant circulating path for cooling the center conductor is provided to cool the coolant through heat exchange to form a central heat- And the end portion testing device for the power cable.

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