WO2018066743A1

WO2018066743A1 - Power cable end test device

Info

Publication number: WO2018066743A1
Application number: PCT/KR2016/012107
Authority: WO
Inventors: 유희석; 김해종; 심기덕; 오상수; 조전욱
Original assignee: 한국전기연구원
Priority date: 2016-10-07
Filing date: 2016-10-26
Publication date: 2018-04-12
Also published as: KR20180038854A; KR102657040B1

Abstract

The present invention relates to a power cable end test device and, more particularly, to a cable terminal end test device coupled to a cable terminal comprising a core conductor so as to evaluate characteristics of the cable terminal, the cable terminal test device comprising, as the technical gist thereof: a connection conductor portion having an end connected to the cable terminal to receive an applied voltage; an insert portion made of a conductor so as to receive the voltage from the cable terminal, the other end of the connection conductor portion being inserted and coupled into the insert portion; and a dead end portion made of an insulating material so as to surround the insert portion such that an exposed area of the insert portion, which receives the voltage, remains insulated at a fluid interface. Accordingly, no cable is needed to connect the test device and the terminal, or a cable with the minimum length can be used to this end, thereby reducing waste of the cable. In addition, the test device and the terminal can be coupled directly such that the withstand voltage and electric insulation performance can be tested in a simple manner. Furthermore, a withstand voltage facility with a smaller capacity, compared with conventional test devices, can be used for testing, thereby minimizing the cost of each test, the cost of the test facility, and the area of the testing facility.

Description

End Tester for Power Cable

The present invention relates to an end test apparatus for a power cable, and more particularly, does not require a cable connecting a test apparatus such as a dead end for a development test and a terminal under test, or uses a cable having a minimum length. The present invention relates to an end test apparatus for power cables that can reduce waste of cables.

In general, terminal devices for power cables, such as superconducting cables, paper insulated cables, plastic insulated cables, etc., are used for general overhead transmission lines made of conductors or power devices such as GIS and transformers. Refers to a device that connects the power cable. For example, a terminal device for a superconducting cable among such power cable terminal devices is for connection between a current lead disposed at room temperature and a superconducting cable disposed in a cryogenic refrigerant tank. As shown in FIG. 1, the basic structure of the terminal device 10 for the superconducting cable is coupled to the room temperature part 11 filled with the insulating oil or the insulating gas, the room temperature part 11, and includes a current lead 12. Cryogenic portion 13 in the state, the connecting portion 15 for connecting the current lead 12 and the superconducting cable 14 to each other inside the coupling portion of the room temperature portion 11 and the cryogenic portion 13, and the connecting portion 15 The solid insulating bushing 16 formed on the outside of the) is formed.

Such a cable terminal device is used as a product by measuring electrical characteristics such as withstand voltage, partial discharge, and electrical insulation performance before applying the cable terminal device to a product even in the case of a ground insulation cable or a plastic insulated cable as well as a superconducting cable. It is applied after confirming that the following criteria are met. Therefore, the cable terminal device can only be tested if the device for testing the electrical characteristics of the cable terminal device is coupled to the end of the cable extending outward from the cable terminal device. Here, a general superconducting cable end test apparatus 30 includes an insulating member 32 coupled to an end of the cable 31 extending outwardly, and a connection portion 33 connecting the cable 31 to the insulating member 32. And a chamber 34 including the connection part 33 and the insulating member 32 formed therein and including the refrigerant so that the connection part 33 and the insulating member 32 are impregnated with the refrigerant.

However, such cable end test apparatus is connected to the cable terminal and the end test apparatus respectively by inserting and connecting the cable, and after the characteristic test, the cable cannot be reused and disposed of. Therefore, there is a disadvantage that the manufacturing cost increases because the cable is wasted each time the cable terminal device is tested. In addition to this, there is a disadvantage in that the cable terminal device and the test device are connected to each other by inserting the cable into a separate structure, which requires a lot of space for the test including the cable length.

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

In addition, the end test apparatus and the terminal is directly coupled to provide an end test apparatus for a power cable that can easily test the withstand voltage and electrical insulation performance.

In addition, it is possible to test with a withstand voltage equipment having a smaller capacity than the conventional end test apparatus to provide an end test apparatus for a power cable that can minimize test time, test cost, test equipment cost, and test equipment area.

The above object is connected to the terminal for the cable including a center conductor in the cable end test apparatus for evaluating the characteristics of the terminal, the connection end is connected to the cable terminal receives the applied voltage Body part; An insert part of the other end of the connecting conductor part inserted into and coupled to the inside of the connecting conductor part, the insert part comprising a conductor receiving a voltage from the cable terminal; It is achieved by an end test apparatus for a cable, characterized in that it comprises a dead end portion made of an insulating material surrounding the insert portion so that the exposed portion of the insert portion through which the voltage is transmitted is maintained at the fluid interface. .

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

The apparatus may further include a reinforcing insulating part formed outside to surround the dead end part and the connection conductor part, wherein the reinforcing insulating part includes at least one of epoxy, polypropylene laminated paper (PPLP), and kraft paper. It is preferable to form at least one.

And a fluid storage unit for storing the cable terminal and a fluid for cooling or insulating the dead end unit, wherein the cable terminal is exposed to the fluid stored in the fluid storage unit, and the fluid is the terminal for the cable. It is preferably one of a refrigerant for cooling the insulating material, insulating oil or insulating gas for insulating the terminal for the cable.

The connection conductor part is detachably coupled to at least one of the center conductor and the insert part, both ends of the connection conductor part including a thread, and one end of the connection conductor part includes a screw thread and the central conductor and the bolt. The nut is coupled, and the other end of the connection conductor portion is preferably bolt-nut coupled to the insert portion including a thread.

A sleeve further includes a sleeve between the center conductor and the insert portion, wherein the inner surface and the outer surface of the sleeve portion include threads, and the inner surface of the sleeve portion includes a thread and the connecting conductor portion and the bolt- Nut-coupled, the outer surface of the sleeve portion being bolt-nut coupled to the insert portion comprising a thread or the outer surface of the sleeve portion comprising a thread, bolt-nut coupled to the insert portion comprising a thread, It is preferable that the connection conductor portion is press-bonded.

The connection conductor portion and the insert portion may be made of any one of copper (Cu), copper alloy, aluminum (Al), and aluminum alloy, and the dead end portion may be made of an epoxy material.

The cable terminal includes a central conductor having one end connected to an external cable and the other end connected to a superconducting cable; A terminal for a superconducting cable including a solid insulation bushing formed on the outside of the center conductor, and is connected to the inner side of the solid insulation bushing to form a high voltage insulated path, and a refrigerant for cooling the center conductor is supplied. It is preferable to further include a refrigerant circulation path for forming a central conductor side heat balance 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 having a minimum length or a cable connecting between the end tester and the terminal.

In addition, the end tester and the terminal can be directly coupled to test the withstand voltage and electrical insulation performance easily, as well as the test can be performed with a small capacity withstand voltage facility compared to the conventional test device. Therefore, the test equipment area can be minimized.

1 is a cross-sectional view of an end test apparatus for a cable according to the prior art,

2 and 3 are cross-sectional views of the end test apparatus for a superconducting cable according to the first embodiment,

4 and 5 are cross-sectional views of an end test apparatus for a ground insulation cable according to a second embodiment,

6 and 7 are cross-sectional views of the end test apparatus for the plastic insulated cable according to the third embodiment.

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

As shown in FIGS. 2 to 7, the

end test apparatus

100, 300, or 500 for the power cable of the present invention includes a terminal 200 for a superconducting cable and a terminal 400 for a paper insulated cable. ) And the plastic insulated cable terminal 600, respectively, and the state applied to each terminal will be described in detail with reference to the drawings.

2 and 3 show the cable end test apparatus 100 coupled with the superconducting cable terminal 200 and the superconducting cable terminal 200 to test the superconducting cable terminal 200 according to the first embodiment. It is sectional drawing shown. Superconducting cable terminal 200 is one end is coupled to the external cable and the other end is a terminal coupled to the superconducting cable, the cable end test apparatus 100 of the present invention, the other end of the superconducting cable terminal 200 instead of the superconducting cable The end test apparatus 100 for cables is inserted. That is, without using the superconducting cable to test the superconducting cable terminal 200, the end-test apparatus for the cable 100 is directly coupled to the area where the superconducting cable is coupled, the superconducting cable is wasted through the test as in the prior art Can be reduced.

In this case, the superconducting cable terminal 200 generally includes a structure including a center conductor 210 connected to an external or external cable to which a voltage is applied from the outside, such a center conductor 210 and a center conductor 210. It includes a solid insulating bushing 220 formed on the outside. 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 the superconducting cable. The center conductor 210 is connected to the superconducting cable at the end which is not coupled to the external cable, but 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 central conductor 210 exists in a state installed in the room temperature part 230 filled with the insulating oil.

The solid insulation bushing 220 includes a center conductor 210 therein, and is formed to surround the center conductor 210 so that a part of the center conductor 210 is insulated. The solid insulation bushing 220 is formed for insulation, and exists to protect the center conductor 210 from external shock as well as insulation. The solid insulation bushing 220 is formed in a pillar shape surrounding the central conductor 210, and both ends thereof are formed to gradually decrease in diameter. The solid insulation bushing 220 may be made of epoxy, polypropylene laminated paper (PPLP), and a mixture thereof.

The superconducting cable end test apparatus 100 inserted into an area where the superconducting cable is connected to the superconducting cable terminal 200 and evaluating the characteristics of the superconducting cable terminal 200 includes a connection conductor part 110 and an insert part ( 120 and the 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 the superconducting cable to receive the voltage applied to the center conductor 210. To this end, it is made of a conductive conductor, and the most preferred material may be any one of copper (Cu), copper alloy, aluminum (Al) or aluminum alloy, and other metals may be used. The connection conductor unit 110 may be detachably coupled to at least one of the center conductor 210 and the insert unit 120. Exactly, one end of the connection conductor part 110 includes a screw thread. In this case, the center conductor 210 and the central conductor 210 coupled to one end of the connection conductor part 110 may be screwed, that is, bolt-nut coupling. It is preferable that a screw thread is formed also in the edge part of. The connection conductor 110 has a bolt shape with a thread formed on the surface thereof so that the center conductor 210 and the connection conductor part 110 can be bolt-nut coupled, and the central conductor 210 has a screw thread formed therein. It is made of a shape. Through this, the connection conductor unit 110 may be screwed to the center conductor 210.

The insert part 120 is coupled to the other end of the connection conductor part 110, one end of which is connected to the central conductor 210. Insert portion 120 is the other end of the connection conductor 110 is inserted into and coupled to the inside, it is preferable that the conductor is made of a conductor so that the voltage from the center conductor 210 can be transmitted through the connection conductor portion (110). . The insert part 120 is a component in which a voltage applied from the outside is finally delivered, and is positioned at the distal end so that the voltage is no longer transferred to another configuration. Insert portion 120 is made of 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 110 and the insert 120 is one of the biggest features of the present invention is directly connected (direct connection) without a separate connection cable.

The diameter of the center conductor 210 and the connection conductor 110 is variable according to the capacity of the current, if the current capacity is large, made of a large diameter, if the small capacity is made of a small diameter to facilitate the transfer of current. It is composed. Accordingly, the diameter of the connection conductor 110 is changed according to the current capacity, and since the insert 130 may not be formed differently according to the diameter of the connection conductor 110, the connection conductor 110 and the connection conductor 110 may be different from each other. A sleeve portion 170 may be further included between the insert portions 130. The sleeve portion 170 is connected to the inner surface of the connection conductor portion 110 is inserted into the thread is formed on the outer surface is a bolt-nut coupling with the insert portion 130. Since the sleeve portion 170 has a smaller diameter than the insert portion 120, threads are formed on the outer surface of the sleeve portion 170, and correspondingly, the sleeve portion 170 is recessed to the insert portion 120. Threads are formed inside the region to allow screwing together. The sleeve 170 may determine whether the sleeve 170 is installed between the connection conductor 110 and the insert 130 according to the diameter of the connection conductor 110. In some cases, the coupling unit 110 and the sleeve 170 may be coupled to the sleeve 170, the sleeve 170 may be a coupling screw threaded on the inner surface and the outer surface.

Insert portion 120 made of a conductor is most preferably made of any one of copper (Cu), copper alloy, aluminum (Al) and aluminum alloy material, but this is not limited. Among them, aluminum or aluminum alloy is most suitable because of its similar shrinkage and expansion with epoxy.

As such, the center conductor 210-the connecting conductor part 110-the insert part 120 can be firmly coupled without requiring a separate coupling component through screwing. In some cases, the coupling configuration is not screwed. Each element can be added by adding elements.

The dead end portion 130 surrounding the insert portion 120 includes an insert portion 120 so that an area where the insert portion 120 to which a voltage is finally transmitted is exposed is maintained at an insulated state at a fluid interface. ) Is made of insulating material surrounding. In order to check the withstand voltage and insulation characteristics of the superconducting cable terminal 200, the end of the cable end test apparatus 100 must be tested so that the end of the cable end test apparatus 100 is insulated. The insert portion 120 is preferably 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. Such a structure is preferably manufactured using a method such as molding in the state in which the insert portion 120 is inserted when the dead end portion 130 is first manufactured. In this case, the insert portion 120 is not formed even when a separate coupling structure is formed. ) And the dead end unit 130 is firmly coupled. Here, the dead end unit 130 is preferably made of an epoxy (epoxy) material that is an insulating material, and in some cases, an equivalent insulating material such as fiber reinforced plastics (FRP) may be used.

In some cases, the solid insulation bushing 220 is connected from the outside to the inside to form a high voltage insulation path, and a coolant supplied to cool the center conductor 210 is supplied and cooled through heat exchange to heat the center conductor 210. It may further include a refrigerant circulation path for forming a balance. 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.

The reinforcement insulating part 140 may be further included to increase the insulating performance of the insert part 120 as well as the dead end part 130. The reinforcement insulating part 140 includes the dead end part 130 and is formed outside the dead end part 130 and the connection conductor part 110 so as to surround the circumference of the connection conductor part 110 together. As such, the insulation performance may be increased through the reinforcement insulation unit 140. The reinforcement insulating unit 140 may be formed of at least one or more of epoxy, polypropylene laminated paper (PPLP), and kraft paper. The curved end-end unit 130 and the connection diagram may be formed. PPLP is most preferred to surround the body 110.

Superconducting cables must be impregnated with refrigerant because they must be cooled at low temperatures. Accordingly, since the superconducting cable terminal 200 is also used in the state of being impregnated with the refrigerant, the superconducting cable terminal 200 and the cable end test apparatus 100 are also impregnated with the refrigerant, so that the withstand voltage of the superconducting cable terminal 200 and Electrical insulation performance can be checked. To this end, the superconducting cable terminal 200 and the fluid storage unit 150 for storing the fluid to cool the dead end unit 130 is stored, the superconducting cable terminal 200 in the fluid stored in the fluid storage unit 150 Is exposed. In this case, the fluid may be a refrigerant for cooling the superconducting cable terminal 200 according to the characteristics of the superconducting cable terminal 200, and the refrigerant may be liquid nitrogen or liquid helium. In the related art, since a test apparatus for testing a cable terminal is provided separately from the cable terminal, a fluid storage part is formed in the cable terminal, and a fluid storage part is formed in the cable end test apparatus, thus using approximately twice as much refrigerant. There was a disadvantage. In addition, since the fluid storage unit is provided separately, it has a disadvantage in that it takes up a large volume of the cable test apparatus. However, in the case of the present invention, the superconducting cable terminal 200 and the cable end test apparatus 100 are all configured to exist in a cooled state in one fluid storage unit 150 to solve the conventional disadvantages. Can be.

4 and 5 is an end test apparatus for a cable coupled with the ground insulation cable terminal 400 and the ground insulation cable terminal 400 to test the ground insulation cable terminal 400 according to the second embodiment ( 300 is a cross-sectional view illustrating a general ground insulation cable terminal 400 in a state in which a center conductor 410 is immersed in the fluid storage unit 350. Geo-insulated cable means a cable that is insulated by wrapping the insulating paper on the outside, a representative geo-insulated cable is OF (oil-filled cable) cable. The center conductor 410 corresponding to the ground insulation cable has a flow passage penetrated at the center so that the insulation oil can be drawn out and drawn into the pressure tank when the insulation oil contracts and expands according to the temperature change, and a passage through which voltage flows, such as copper or aluminum. A center conductor body 411 made of stranded conductors and a center conductor insulator 412 electrically insulate the center conductor body 411 from the outside. The center conductor insulator 412 is configured to fill the insulating oil after removing both moisture and air through heating and vacuum drying. In some cases, the central conductor insulator 412 may further include a solid insulator 430 for alleviating a concentrated electric field. In general, the solid insulation portion 430 in the geo-insulated cable uses the bell mouth (bell mouth) most, but is not limited thereto.

The cable end test apparatus 300 for testing the ground insulation cable terminal 400 includes a connection conductor portion 310, an insert portion 320, and a dead end portion 330. The center conductor 410 corresponding to the ground insulation cable of the ground insulation cable terminal 400 is coupled to the connection conductor part 310 which receives a voltage applied to the center conductor 410. At this time, the center conductor 410 is present in a state surrounded by an insulating paper, the center conductor 411 is exposed from the insulating paper in the end region coupled with the connection conductor 310 is coupled to the connection conductor 310. In addition, in order to be coupled to the central conductor 411 and the connection conductor 310, the end of the center conductor 410 may further include a conductor coupling portion 360, such a conductor coupling portion 360 and the connection conductor portion The 310 is coupled to transfer the voltage applied to the center conductor 410 to the connection conductor 310. Here, the conductor coupling part 360 is preferably a compression bracket.

One end of the connection conductor part 310 is coupled to the conductor coupling part 360 and the other end is inserted into and coupled to the insert part 320, and the voltage from the center conductor 410 is connected to the connection conductor part 310. It is made of a conductor so that it can be delivered through. In this case, the coupling between the insert 320 and the connection conductor 310 may be coupled by forming a sleeve 370 between the insert 320 and the connection conductor 310 as in the first embodiment. Both the inner surface of the insert portion 320 and the outer surface of the sleeve portion 370 are bolt-nut coupled with threads. In addition, the outer surface of the connecting conductor portion 310 and the inner surface of the sleeve portion 370 can also be bolt-nut coupling with a thread, or the connecting conductor portion 310 to the sleeve portion 370. After insertion can be combined with each other by compression. In this case, the sleeve 370 is preferably made of copper or a copper alloy material because compression may be performed. When the sleeve 370 is made of aluminum or an aluminum alloy material, a problem may occur in that the aluminum or aluminum alloy received by the pressing process is broken.

Insert portion 320 is made of a diameter larger than the diameter of the connection conductor portion 310 to enable such a coupling, it is present in a shape surrounding the other end of the connection conductor portion (310). In some cases, coupling may be performed by adding coupling elements to secure coupling between the conductor coupling part 360, the connection conductor part 310, and the insert part 320.

The dead end part 330 surrounding the insert part 320 is insulated surrounding the insert part 320 so that an area where the insert part 320 to which a voltage is finally delivered is exposed is kept at an insulating state at the fluid interface. Made of material. Here, the dead end portion 330 is most preferably made of an epoxy material which is an insulating material, but is not limited thereto. The reinforcement insulating part 340 is provided to increase the insulating performance of the upper part of the insert part 320, the connection conductor part 310, the conductor coupling part 360, and the center conductor 410 as well as the dead end part 330. Include. The reinforcing insulation portion 340 includes a dead end portion 330, and is disposed outside the dead end portion 330 and the ground insulation cable terminal 400 so as to surround the periphery of the ground insulation cable terminal 400. Is formed. As such, the insulation performance may be increased through the reinforcement insulation unit 340.

In the case of the center conductor 410, the center conductor 410 is immersed in an insulating fluid to insulate, and for this purpose, the fluid storage unit 350 is formed along the shapes of the terminal 400 for ground insulation cable and the end test apparatus 300 for cable. It includes. The fluid storage unit 350 may be formed such that the entire ground insulation cable terminal 400 may be immersed in the insulation fluid so that all of the ground terminals contact the fluid. Here, the insulating fluid is stored in any one of the insulating oil or insulating gas, the type of insulating oil or insulating gas may be used for all commonly used insulating oil or insulating gas.

6 and 7 are end cable testing apparatus for the cable coupled with the terminal for plastic insulation cable 600 and the terminal for plastic insulation cable 600 to test the terminal 600 for plastic insulated cable according to the third embodiment ( 500 is a cross-sectional view. The terminal 600 for plastic insulated cable may use an XLPE cable as a representative example. The terminal 600 for plastic insulated cable includes a center conductor 610 which is a plastic insulated cable, and an insulating oil storage part 620. Among them, the center conductor 610 is a center conductor body 611 of which a conductor having high conductivity is made of stranded wire, and insulates the center conductor body 611 from the outside, and a center conductor insulation part 612 made of plastic insulation material. It includes. In some cases, the center conductor insulator 612 may further include a solid insulator 630 for mitigating a concentrated electric field. In the terminal 600 for the plastic insulated cable, a stress cone is usually used the most. use.

In order to receive a voltage applied to the center conductor 610 of the terminal 600 for plastic insulated cable, the cable end test apparatus 500 includes a connection conductor part 510, an insert part 520, and a dead end part 530. In the third embodiment, unlike the first and second embodiments, the connection conductor part 510 serves as a sleeve so that the center conductor 610 and the insert part 520 can be electrically connected. do. The connection conductor part 510 has a smooth surface at one end connected to the center conductor 610, and a thread is formed at the other end coupled to the insert part 520. In addition, a screw thread is formed inside the insert portion 520 so that the connection conductor portion 510 and the insert portion 520 perform bolt-nut coupling. In the case of the connection conductor part 510 and the center conductor 610 which are not bolted-nut coupling, the center conductor 610 is inserted into the connection conductor part 510, and then the connection conductor part 510 is crimped | bonded together. To be done. At this time, when the connection conductor 510 is compressed, the outside may not be smooth and irregularities may occur. For this purpose, the connection conductor 510 is configured to surround the outside through a separate connection insulation part 540.

In addition, in the third embodiment, there is a difference that the reinforcing insulation parts 140 and 340 included in the first and second embodiments are not formed in addition, and the insert part 520 and the dead end part 530 Silicon grease may be injected into the interspace to facilitate insulation in the interspace.

In the case of the end test apparatus 500 for the plastic insulated cable, the fluid storage part 550 surrounding the terminal for the plastic insulated cable 600 and the dead end part 530 is formed. In the case of the end test apparatus 500 for the plastic insulated cable, the insulating gas is stored in the fluid storage unit 550, and the insulating gas is most preferably dry air containing no moisture. Since the plastic insulation cable terminal 600 is vulnerable to moisture, dry air is injected to prevent damage to the plastic insulation cable terminal 600. In some cases, the area of the end test apparatus 500 for the cable including the dead end unit 530 may be present in the exposed state without being included in the fluid storage unit 550. That is, although the insulating oil storage part 620 is formed in the region of the central conductor 610 to store the insulating fluid that insulates the central conductor 610, the end testing device 500 for the end of the central conductor 610 and the cable are insulated fluid. Avoid contact with Therefore, the sealing member 640 is included between the insulating oil storage part 620 and the center conductor 610 penetrating through the insulating oil storage part 620 so that the insulating fluid does not count.

The conventional cable end test apparatus has a problem that the cable used only in the terminal test for the cable is discarded after the test and the cable is wasted, whereas the

end test apparatus

100, 300, 500 for the power cable of the present invention is a test apparatus. And because the cable does not require a cable connecting between the terminal (200, 400, 600) or using a minimum cable structure can reduce the waste of the cable. In addition, since the structure is directly coupled to the cable terminal (200, 400, 600), it is possible to simply test the withstand voltage and electrical insulation performance, and the unit cost of the test unit and the power cable end test apparatus (100, 300, 500) There is an advantage that the manufacturing cost can be reduced.

The present invention relates to an end test apparatus for a power cable, and more particularly, does not require a cable connecting a test apparatus such as a dead end for a development test and a terminal under test, or uses a cable having a minimum length. It can be used in the field of end test apparatus for power cable which can reduce the waste of the cable.

Claims

In the end test apparatus for the power cable coupled to the terminal for the cable including a central conductor to evaluate the characteristics of the terminal for the cable,

A connection conductor part having one end connected to the cable terminal and receiving an applied voltage;

An insert part of the other end of the connecting conductor part inserted into and coupled to the inside of the connecting conductor part, the insert part comprising a conductor receiving a voltage from the cable terminal;

An end test apparatus for a power cable comprising a dead end portion formed of an insulating material surrounding the insert portion such that an area where the insert portion to which a voltage is transmitted is exposed is maintained at an insulating state at a fluid interface.
The method of claim 1,

End connection apparatus for the power cable, characterized in that the connection conductor portion and the insert portion is directly connected (direct connection) without a separate connection cable.
The method of claim 1,

And a reinforcing insulation portion formed outside so as to surround the dead end portion and the connection conductor portion.
The method of claim 3, wherein

The reinforcing insulation unit is an end test apparatus for power cables, characterized in that formed of at least one or more of epoxy, polypropylene laminated paper (PPLP) and kraft paper (kraft paper).
The method of claim 1,

And a fluid storage unit for storing the cable terminal and a fluid for cooling or insulating the dead end unit, wherein the cable terminal is exposed to the fluid stored in the fluid storage unit.
The method of claim 5,

The fluid is an end test apparatus for a power cable, characterized in that any one of a refrigerant to cool the cable terminal, insulating oil or insulating gas to insulate the cable terminal.
The method of claim 1,

And the connection conductor part is detachably coupled to at least one of the center conductor and the insert part.
The method of claim 1,

Both ends of the connection conductor portion includes a thread,

One end of the connection conductor part is bolt-nut coupled to the center conductor including a thread, and the other end of the connection conductor part is bolt-nut coupled to the insert part including the thread. Device.
The method of claim 1,

And a sleeve portion between the center conductor and the insert portion.
The method of claim 9,

The inner surface and the outer surface of the sleeve portion includes a thread,

The inner surface of the sleeve portion is bolt-nut coupled to the connecting conductor portion including a thread, the outer surface of the sleeve portion is bolt-nut coupled to the insert portion including the threaded end test apparatus .
The method of claim 9,

The outer surface of the sleeve portion includes a thread,

An end test apparatus for a power cable, characterized in that a bolt-nut is coupled to the insert portion including a screw thread, and is press-bonded to the connection conductor portion.
The method of claim 1,

The connection conductor portion and the insert portion is an end test apparatus for a power cable, characterized in that made of any one of copper (Cu), copper alloy, aluminum (Al) and aluminum alloy material.
The method of claim 1,

The dead end unit for the power cable end test apparatus, characterized in that made of epoxy (epoxy) material.
The method of claim 1,

The cable terminal,

A center conductor having one end connected to an external cable and the other end connected to a superconducting cable; An end test apparatus for a power cable, characterized in that the terminal for a superconducting cable including a solid insulated bushing formed outside the center conductor.
The method of claim 14,

And a refrigerant circulation path connected to the inner side of the solid insulated bushing to form a high voltage insulated path and supplied with a coolant for cooling the center conductor to cool through heat exchange. End test apparatus for a power cable, characterized in that.