High-voltage cable test system and its construction method

Abstract

The present invention discloses a high-voltage cable test system and a method for building the same. The high-voltage cable test system includes: a high-voltage cable test auxiliary device, which includes an insulating gas tank and an intermediate GIS terminal. The insulating gas tank has a chamber for filling insulating gas, a first interface at one end of the chamber, and a second interface at the other end of the chamber. The first interface is for the on-site GIS terminal connected to the high-voltage cable to pass through. The intermediate GIS terminal passes through the second interface, and the intermediate GIS terminal is electrically connected to the on-site GIS terminal through a conductor arranged in the chamber; an intermediate cable, one end of which is connected to the intermediate GIS terminal; an outdoor terminal, which is connected to the other end of the intermediate cable; and a test device, which is connected to the outdoor terminal through a high-voltage wire. When the safety clearance of the space where the GIS switch is located is insufficient and the space is limited and inconvenient to place the test device, the high-voltage cable can still be tested.

Description

Technical Field

[0001] The present invention relates to the technical field of cable testing, and particularly to a high-voltage cable testing system and a method for building the same. Background Art

[0002] In recent years, the construction of high-voltage, extra-high-voltage and even ultra-high-voltage power transmission cable lines in China has developed rapidly. The high-voltage cable GIS terminal is an essential part of the power transmission system. Among them, the function of some high-voltage cable GIS terminals is to connect the cable system with the GIS switch. In a newly built project, before connecting the cable system to the GIS switch through the cable GIS terminal, it is often necessary to separately conduct on-site handover tests on the cable system and the GIS switch. Among them, the cable system is tested by applying high voltage on the cable GIS terminal side, and the cable GIS terminal cannot apply voltage alone. At this time, a test device is needed. Generally, the GIS switch is indoors. When there is not enough indoor safety clearance or the indoor space is limited and it is inconvenient to place the test device, the high-voltage cable system cannot be tested. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a high-voltage cable testing system, which can still test the high-voltage cable when the safety clearance of the space where the GIS switch is located is insufficient or the space is limited and it is inconvenient to place the test device.

[0004] The present invention also provides a method for building the above high-voltage cable testing system.

[0005] The high-voltage cable testing system according to the first aspect embodiment of the present invention includes: a high-voltage cable testing auxiliary device, which includes an insulating gas tank and an intermediate GIS terminal. The insulating gas tank has a chamber for filling insulating gas, a first interface at one end of the chamber, and a second interface at the other end of the chamber. The first interface is used for the on-site GIS terminal connected to the high-voltage cable to pass through. The intermediate GIS terminal passes through the second interface, and the intermediate GIS terminal is electrically connected to the on-site GIS terminal through a conductor arranged in the chamber; an intermediate cable, one end of the intermediate cable is connected to the intermediate GIS terminal; an outdoor terminal, the outdoor terminal is connected to the other end of the intermediate cable; a test device, the test device is connected to the outdoor terminal through a high-voltage wire.

[0006] The high-voltage cable testing system according to the embodiment of the present invention has at least the following beneficial effects:

[0007] In the high-voltage cable test system of the present invention, the high-voltage cable test auxiliary device can be placed in the relatively narrow space where the GIS switch is located. The on-site GIS terminal connected to the on-site high-voltage cable is inserted into the insulating gas tank through the first interface of the insulating gas tank. The other end of the insulating gas tank is pre-installed with an intermediate GIS terminal through the second interface. The inside of the gas tank is filled with SF6 gas as the insulating gas. One end of the intermediate GIS terminal leads out an intermediate cable of a certain length. The intermediate cable passes through the space where the GIS switch is located and is led to a spacious space convenient for conducting tests (convenient for applying high voltage). Thus, when on-site handover tests are performed on high-voltage cables and there are situations where the space at the GIS switch is limited, the test device cannot be placed, and the safety clearance at the GIS switch is insufficient, etc., with the help of the high-voltage cable test auxiliary device of the present invention, the high-voltage cable can be led out for easy testing.

[0008] According to some embodiments of the present invention, the intermediate GIS terminal has a first clamping step; the other end of the insulating gas tank is connected with a first annular clamping plate, the first annular clamping plate is connected with a second annular clamping plate through a first fastener, the second annular clamping plate is located on the side of the first annular clamping plate away from the insulating gas tank, and the first clamping step is clamped between the first annular clamping plate and the second annular clamping plate.

[0009] According to some embodiments of the present invention, the first clamping step is in sealing cooperation with the first annular clamping plate; the first clamping step is in sealing cooperation with the second annular clamping plate.

[0010] According to some embodiments of the present invention, the first clamping step has a first step surface disposed opposite to the first annular clamping plate, and a first sealing ring is disposed between the first step surface and the first annular clamping plate; the first clamping step further has a second step surface disposed opposite to the first step surface, the second step surface is disposed opposite to the second annular clamping plate, and a second sealing ring is disposed between the second step surface and the second annular clamping plate.

[0011] According to some embodiments of the present invention, the on-site GIS terminal has a second clamping step; one end of the insulating gas tank is connected with a third annular clamping plate, the third annular clamping plate is connected with a fourth annular clamping plate through a second fastener, the fourth annular clamping plate is located on the side of the third annular clamping plate away from the insulating gas tank, and the second clamping step is clamped between the third annular clamping plate and the fourth annular clamping plate.

[0012] According to some embodiments of the present invention, the second clamping step is in sealing cooperation with the third annular clamping plate; the second clamping step is in sealing cooperation with the fourth annular clamping plate.

[0013] According to some embodiments of the present invention, the second clamping step has a third step surface disposed opposite to the third annular clamping plate, and a third sealing ring is disposed between the third step surface and the third annular clamping plate; the second clamping step further has a fourth step surface disposed opposite to the third step surface, the fourth step surface is disposed opposite to the fourth annular clamping plate, and a second sealing ring is disposed between the fourth step surface and the fourth annular clamping plate.

[0014] According to some embodiments of the present invention, rollers are provided at the bottom of the insulating gas tank.

[0015] According to some embodiments of the present invention, the insulating gas tank is a horizontal cylindrical structure.

[0016] A method for building a high-voltage cable test system according to an embodiment of the second aspect of the present invention includes:

[0017] Moving the high-voltage cable test auxiliary device into the space where the GIS switch is located;

[0018] Passing the on-site GIS terminal connected to the high-voltage cable through the first interface into the chamber;

[0019] Inserting the conductor into the chamber and connecting the intermediate GIS terminal and the on-site GIS terminal with the conductor;

[0020] Evacuating the chamber, then filling the chamber with insulating gas, and then sealing the insulating gas tank;

[0021] Connecting one end of the intermediate cable to the intermediate GIS terminal, leading the other end of the intermediate cable out of the space where the GIS switch is located, and connecting an outdoor terminal to the other end of the intermediate cable;

[0022] Connecting the high-voltage wire connected to the test device to the outdoor terminal.

[0023] The method for building a high-voltage cable test system according to an embodiment of the present invention has at least the following beneficial effects:

[0024] Using the method for building a high-voltage cable test system of the present invention, when a high-voltage cable is subjected to an on-site handover test and there are situations such as limited space at the GIS switch location where the test device cannot be placed and insufficient safety clearance at the GIS switch location, the high-voltage cable can be led out for easy testing.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, where:

[0027] Figure 1 It is a schematic structural diagram of a high-voltage cable test system according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic structural diagram of a high-voltage cable test auxiliary device according to an embodiment of the present invention;

[0029] Figure 3 is Figure 2 an enlarged view of part A in

[0030] Figure 4 is Figure 2 an enlarged view of part B in

[0031] Figure 5 is Figure 2 an enlarged view of part C in

[0032] Reference numerals in the drawings:

[0033] 100. High-voltage cable test auxiliary device; 110. Insulating gas tank; 110a. First sealing ring; 110b. Second sealing ring; 110c. Third sealing ring; 110d. Fourth sealing ring; 111. Chamber; 112. First annular clamping plate; 113. Second annular clamping plate; 114. First fastener; 115. Third annular clamping plate; 116. Fourth annular clamping plate; 117. Second fastener; 120. Intermediate GIS terminal; 121. First clamping step; 130. Conductor; 140. Roller; 150. Pressure gauge;

[0034] 200. High-voltage cable; 210. On-site GIS terminal; 211. Second clamping step;

[0035] 300. Test device;

[0036] 400. Intermediate cable;

[0037] 500. Outdoor terminal;

[0038] 600. High-voltage line. Detailed implementation manners

[0039] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] As Figure 1 shown, a high-voltage cable test system provided by the present invention includes a high-voltage cable test auxiliary device 100, an intermediate cable 400, an outdoor terminal 500 and a test device 300.

[0043] The high-voltage cable test auxiliary device 100 includes an insulating gas tank 110 and an intermediate GIS terminal 120.

[0044] As Figure 2 shown, the insulating gas tank 110 has a chamber 111 for filling insulating gas, a first interface located at one end of the chamber 111, and a second interface located at the other end of the chamber 111.

[0045] Specifically, the insulating gas tank 110 is a hollow structure having a chamber 111, the first interface and the second interface are respectively located at opposite ends of the chamber 111, and both the first interface and the second interface are in communication with the chamber 111.

[0046] More specifically, the insulating gas tank 110 is a horizontal long cylindrical structure. The first interface and the second interface are respectively located at the left and right ends of the insulating gas tank 110. The first interface is for the on-site GIS terminal 210 connected to the high-voltage cable 200 to pass through, and the second interface is for the intermediate GIS terminal 120 to pass through. Among them, the intermediate GIS terminal 120 and the on-site GIS terminal 210 are electrically connected through a conductor 130 arranged in the chamber 111. Among them, the conductor 130 can be made of materials with relatively high electrical conductivity such as gold and copper.

[0047] It can be understood that the chamber 111 is for filling insulating gas, and the insulating gas can be SF6. After the on-site GIS terminal 210 passes through the first interface, it can seal the first interface. After the intermediate GIS terminal 120 passes through the second interface, it can seal the second interface.

[0048] As Figure 1 shown, it should be noted that the on-site GIS terminal 210 is connected to the end of the high-voltage cable 200. The on-site GIS terminal 210 can improve the electric field distortion at the end of the high-voltage cable 200 and uniform the electric field. The intermediate GIS terminal 120 is connected to the end of the intermediate cable 400. One end of the intermediate cable 400 far from the intermediate GIS terminal 120 is used to connect to the test device 300. Among them, the intermediate GIS terminal 120 can improve the electric field distortion at the end of the intermediate cable 400 and uniform the electric field.

[0049] Furthermore, it should be noted that the test device 300 is a power frequency withstand voltage test equipment, which can generate voltage so that the entire high-voltage cable 200 to be tested undergoes a withstand voltage test.

[0050] Furthermore, the test device 300 is connected with a high-voltage wire 600. One end of the intermediate cable 400 far from the intermediate GIS terminal 120 is connected with an outdoor terminal 500. The outdoor terminal 500 is connected with the high-voltage wire 600. The outdoor terminal 500 can improve the electric field distortion at one end of the intermediate cable 400 far from the intermediate GIS terminal 120 and uniform the electric field. The test device 300 can generate voltage, and the voltage can be guided to the outdoor terminal 500 through the high-voltage wire 600 and conducted to the on-site GIS terminal 210 and the high-voltage cable 200 through the intermediate cable 400, the intermediate GIS terminal 120, and the conductor 130. Among them, the outdoor terminal 500 is an integral prefabricated outdoor terminal. It can be understood that while testing the high-voltage cable 200, since the on-site GIS terminal 210 is also inserted into the insulating gas tank 110, the on-site GIS terminal 210 is also tested at the same time.

[0051] It should be noted that by passing the on-site GIS terminal 210 through the first interface, passing the intermediate GIS terminal 120 through the second interface, and using an insulating gas to provide insulation protection for the on-site GIS terminal 210 and the intermediate GIS terminal 120, the risk of electrical breakdown can be reduced.

[0052] When the high-voltage cable test auxiliary device 100 of the present invention is in use, the high-voltage cable test auxiliary device 100 can be placed in the relatively narrow space where the GIS switch is located. The on-site GIS terminal 210 connected to the on-site high-voltage cable 200 is inserted into the insulating gas tank 110 through the first interface of the insulating gas tank 110. The other end of the insulating gas tank 110 is pre-installed with the intermediate GIS terminal 120 through the second interface. The inside of the gas tank is filled with SF6 gas as the insulating gas. One end of the intermediate GIS terminal 120 leads out an intermediate cable 400 of a certain length, and the intermediate cable 400 passes through the space where the GIS switch is located and is led to a spacious space convenient for testing (convenient for applying high voltage). In this way, when a field acceptance test is performed on the high-voltage cable 200 and there are situations such as limited space at the GIS switch where the test device 300 cannot be placed and insufficient safety clearance at the GIS switch, with the help of the high-voltage cable test auxiliary device 100 of the present invention, the high-voltage cable 200 can be led out for easy testing.

[0053] As Figure 3 shown, in some embodiments, the intermediate GIS terminal 120 has a first clamping step 121; one end of the insulating gas tank 110 away from the first interface is connected with a first annular clamping plate 112, the first annular clamping plate 112 is connected with a second annular clamping plate 113 through a first fastener 114, the second annular clamping plate 113 is located on the side of the first annular clamping plate 112 away from the insulating gas tank 110, and the first clamping step 121 is clamped between the first annular clamping plate 112 and the second annular clamping plate 113.

[0054] It can be understood that a side portion of the intermediate GIS terminal 120 protrudes to form the first clamping step 121. After the intermediate GIS terminal 120 passes through the second interface and abuts against the first annular clamping plate 112, the second annular clamping plate 113 is connected to the first annular clamping plate 112 by using the first fastener 114, and the second annular clamping plate 113 abuts against the side of the first clamping step 121 away from the first annular clamping plate 112, so as to fix the intermediate GIS terminal 120.

[0055] Furthermore, the first clamping step 121 is in sealing cooperation with the first annular clamping plate 112; the first clamping step 121 is in sealing cooperation with the second annular clamping plate 113. In this way, after the intermediate GIS terminal 120 passes through the second interface, the second interface can be sealed to ensure the sealing effect of the chamber 111.

[0056] Specifically, the first clamping step 121 has a first step surface disposed opposite to the first annular clamping plate 112, and a first sealing ring 110a is disposed between the first step surface and the first annular clamping plate 112. The first clamping step 121 further has a second step surface disposed opposite to the first step surface, the second step surface is disposed opposite to the second annular clamping plate 113, and a second sealing ring 110b is disposed between the second step surface and the second annular clamping plate 113.

[0057] Further, the first fastener 114 is operable to drive the second annular clamping plate 113 closer to or farther from the first annular clamping plate 112.

[0058] It can be understood that the first fastener 114 can change the distance between the second annular clamping plate 113 and the first annular clamping plate 112, so as to adjust the pre-tightening force of the first clamping step 121 being clamped, and thus adjust the sealing effect.

[0059] Specifically, the first fastener 114 is a bolt, the first annular clamping plate 112 is provided with a threaded hole, the second annular clamping plate 113 is provided with a through hole, and the first fastener 114 is sequentially passed through the through hole and the threaded hole. By rotating the first fastener 114, the distance between the second annular clamping plate 113 and the first annular clamping plate 112 can be changed.

[0060] As Figure 4 shown, in some embodiments, the on-site GIS terminal 210 has a second clamping step 211; one end of the insulating gas tank 110 away from the second interface is connected with a third annular clamping plate 115, the third annular clamping plate 115 is connected with a fourth annular clamping plate 116 through a second fastener 117, the fourth annular clamping plate 116 is located on the side of the third annular clamping plate 115 away from the insulating gas tank 110, and the second clamping step 211 is clamped between the third annular clamping plate 115 and the fourth annular clamping plate 116.

[0061] It can be understood that the side of the on-site GIS terminal 210 bulges to form the second clamping step 211. After the on-site GIS terminal 210 passes through the first interface and abuts against the third annular clamping plate 115, the fourth annular clamping plate 116 is connected to the third annular clamping plate 115 by using the second fastener 117, and the fourth annular clamping plate 116 abuts against the side of the second clamping step 211 away from the third annular clamping plate 115, so as to fix the on-site GIS terminal 210.

[0062] Further, the second clamping step 211 is in sealing cooperation with the third annular clamping plate 115; the second clamping step 211 is in sealing cooperation with the fourth annular clamping plate 116. Thus, when the on-site GIS terminal 210 passes through the first interface, the sealing of the first interface can be achieved, and the sealing effect of the chamber 111 can be ensured.

[0063] Specifically, the second snap step 211 has a third step surface disposed opposite to the third annular snap plate 115, and a third sealing ring 110c is disposed between the third step surface and the third annular snap plate 115. The second snap step 211 further has a fourth step surface disposed opposite to the third step surface, the fourth step surface is disposed opposite to the fourth annular snap plate 116, and a fourth sealing ring 110d is disposed between the fourth step surface and the fourth annular snap plate 116.

[0064] Furthermore, the second fastener 117 is operable to drive the fourth annular snap plate 116 closer to or farther from the third annular snap plate 115.

[0065] It can be understood that the second fastener 117 can change the distance between the fourth annular snap plate 116 and the third annular snap plate 115, thereby adjusting the pre-tightening force with which the second snap step 211 is clamped, and thus adjusting the sealing effect.

[0066] Specifically, the second fastener 117 is a bolt, the third annular snap plate 115 is provided with a threaded hole, the fourth annular snap plate 116 is provided with a through hole, the second fastener 117 is sequentially passed through the through hole and the threaded hole, and by rotating the second fastener 117, the distance between the fourth annular snap plate 116 and the third annular snap plate 115 can be changed.

[0067] As Figure 2 shown, in some embodiments, rollers 140 are provided at the bottom of the insulating gas tank 110. In this way, the movement of the insulating gas tank 110 can be facilitated, and it is convenient to move the insulating gas tank 110 into the space where the GIS switch is located.

[0068] As Figure 5 shown, further, a pressure gauge for detecting the internal air pressure of the chamber 111 is installed on the insulating gas tank 110. In addition, the insulating gas tank 110 is made of a metal component such as stainless steel or copper and can withstand a gas pressure of 2 Mpa, while the pressure of the insulating gas filled into the insulating gas tank 110 is not less than 0.25 Mpa.

[0069] In the high-voltage cable 200 test system of the present invention, the high-voltage cable test auxiliary device 100 can be placed in the relatively narrow space where the GIS switch is located. The on-site GIS terminal 210 connected to the on-site high-voltage cable 200 is inserted into the insulating gas tank 110 through the first interface of the insulating gas tank 110. The other end of the insulating gas tank 110 is pre-installed with an intermediate GIS terminal 120 through the second interface. The inside of the gas tank is filled with SF6 gas as the insulating gas. One end of the intermediate GIS terminal 120 leads out an intermediate cable 400 of a certain length. The intermediate cable 400 passes through the space where the GIS switch is located and is led to a spacious space convenient for testing (convenient for applying high voltage). The test device 300 can generate voltage, and the voltage can be guided to the outdoor terminal 500 through the high-voltage wire 600, and is conducted to the on-site GIS terminal 210 and the high-voltage cable 200 through the intermediate cable 400, the intermediate GIS terminal 120, and the conductor 130, so as to realize the high-voltage test of the high-voltage cable 200 and the on-site GIS terminal 210. Thus, when the high-voltage cable 200 undergoes an on-site handover test and there are situations such as limited space at the GIS switch location where the test device 300 cannot be placed and insufficient safety clearance at the GIS switch location, with the help of the high-voltage cable test auxiliary device 100 of the present invention, the high-voltage cable 200 can be led out for easy testing.

[0070] As Figure 1 shown, the present invention also provides a method for building a high-voltage cable test system, including:

[0071] S100, moving the high-voltage cable test auxiliary device 100 into the space where the GIS switch is located;

[0072] S200, passing the on-site GIS terminal 210 connected to the high-voltage cable 200 through the first interface into the chamber 111;

[0073] S300, extending the conductor 130 into the chamber 111 of the insulating gas tank 110 and connecting the intermediate GIS terminal 120 and the on-site GIS terminal 210 by using the conductor 130;

[0074] S400, evacuating the chamber 111, then filling the chamber 111 with insulating gas, and then sealing the insulating gas tank 110;

[0075] S500, connecting one end of the intermediate cable 400 to the intermediate GIS terminal 120, leading the other end of the intermediate cable 400 out of the space where the GIS switch is located, and connecting an outdoor terminal 500 to the other end of the intermediate cable 400;

[0076] S600, connecting the high-voltage wire 600 connected to the test device to the outdoor terminal 500.

[0077] Using the method for setting up the high-voltage cable test system of the present invention, when on-site handover tests are performed on the high-voltage cable 200 and there are situations such as limited space at the GIS switch where the test device 300 cannot be placed and insufficient safety clearance at the GIS switch, the high-voltage cable 200 can be led out to facilitate the test.

[0078] In the description of the present specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0079] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for building a high-voltage cable test system, characterized in that, Including: Move the high-voltage cable test auxiliary device into the space where the GIS switch is located. The high-voltage cable test auxiliary device includes an insulating gas tank and an intermediate GIS terminal. The insulating gas tank has a chamber for filling insulating gas, a first interface at one end of the chamber, and a second interface at the other end of the chamber. The intermediate GIS terminal passes through the second interface. Pass the on-site GIS terminal connected to the high-voltage cable through the first interface and into the chamber. Insert a conductor into the chamber and use the conductor to connect the intermediate GIS terminal and the on-site GIS terminal. Vacuum the chamber, then fill the chamber with insulating gas, and then seal the insulating gas tank. Connect one end of the intermediate cable to the intermediate GIS terminal, lead the other end of the intermediate cable out of the space where the GIS switch is located, and connect an outdoor terminal to the other end of the intermediate cable. Connect the high-voltage wire connected to the test device to the outdoor terminal.

2. The method for building a high-voltage cable test system according to claim 1, characterized in that, The intermediate GIS terminal has a first clamping step; a first annular clamping plate is connected to the other end of the insulating gas tank. The first annular clamping plate is connected to a second annular clamping plate through a first fastener. The second annular clamping plate is located on the side of the first annular clamping plate away from the insulating gas tank. The first clamping step is clamped between the first annular clamping plate and the second annular clamping plate.

3. The method for building a high-voltage cable test system according to claim 2, wherein The first clamping step is in sealing cooperation with the first annular clamping plate; the first clamping step is in sealing cooperation with the second annular clamping plate.

4. The method for building a high-voltage cable test system according to claim 3, characterized in that The first clamping step has a first step surface opposite to the first annular clamping plate, and a first sealing ring is arranged between the first step surface and the first annular clamping plate; the first clamping step also has a second step surface opposite to the first step surface. The second step surface is opposite to the second annular clamping plate, and a second sealing ring is arranged between the second step surface and the second annular clamping plate.

5. The method for building a high-voltage cable test system according to claim 1, wherein The on-site GIS terminal has a second clamping step; a third annular clamping plate is connected to one end of the insulating gas tank. The third annular clamping plate is connected to a fourth annular clamping plate through a second fastener. The fourth annular clamping plate is located on the side of the third annular clamping plate away from the insulating gas tank. The second clamping step is clamped between the third annular clamping plate and the fourth annular clamping plate.

6. The method for building a high-voltage cable test system according to claim 5, wherein The second clamping step is in sealing cooperation with the third annular clamping plate; the second clamping step is in sealing cooperation with the fourth annular clamping plate.

7. The method for building a high-voltage cable test system according to claim 6, wherein The second clamping step has a third step surface opposite to the third annular clamping plate, and a third sealing ring is arranged between the third step surface and the third annular clamping plate; the second clamping step also has a fourth step surface opposite to the third step surface. The fourth step surface is opposite to the fourth annular clamping plate, and a second sealing ring is arranged between the fourth step surface and the fourth annular clamping plate.

8. The method for building a high-voltage cable test system according to claim 1, characterized in that Rollers are arranged at the bottom of the insulating gas tank.

9. The method for building a high-voltage cable test system according to claim 1, characterized in that The insulating gas tank is a horizontal cylindrical structure.

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