Test System for Gas Insulated Switchgear

Abstract

The present application provides a test system for a gas-insulated switchgear. The first gas-insulated switchgear and the second gas-insulated switchgear are both electrically connected to the busbar. When the first gas-insulated switchgear serves as the lead of the second gas-insulated switchgear, the first gas-insulated switchgear is electrically connected to the busbar as a conductor. The gas-insulated switchgear is a metal-sealed switching device, and all high-voltage components are enclosed in an airtight gas chamber welded by stainless steel. Each separated gas chamber is filled with SF6 gas. Except for the cable connection points, there are no exposed points between other components. Since preventive tests require wiring at both ends to be completed, two gas-insulated switchgears are used as a group. Among them, the gas-insulated switchgear serves as the conductor (lead) of the second gas-insulated switchgear, and the cable connection points of the two gas-insulated switchgears serve as the head and tail ends of the test wiring, so that the corresponding test can be completed without pumping air and removing components.

Description

Technical Field

[0001] This application relates to the technical field of gas cabinets, and more particularly, to a test system for a gas-insulated switchgear cabinet. Background Art

[0002] The 35kV SF6 gas-insulated switchgear cabinet is a metal-sealed switchgear. All high-voltage components are enclosed in an airtight chamber welded by stainless steel with good airtightness, and each separated air chamber is filled with SF6 gas. Because all high-voltage components are completely enclosed and have high safety, it is widely used in the power supply systems of all walks of life. According to the provisions of DL / T596, the preventive test items of gas-insulated switchgear cabinets mainly include AC withstand voltage test, circuit breaker characteristic test, conductive loop resistance and current transformer test, etc. Currently, to complete the preventive test of a gas cabinet, generally, the test is completed before the installation of the gas-insulated switchgear cabinet, or the SF6 gas in the air chamber of the gas-insulated switchgear cabinet is pumped out and recovered, and the corresponding part is removed for testing. Or simply not do the test due to difficulties in handing over. If the corresponding part of the gas-insulated switchgear cabinet needs to be removed for testing, it will increase the test cost and test time, or it is very easy to cause equipment accidents due to improper installation. If the test is not done, it will increase the operation risk of the gas-insulated switchgear cabinet (not meeting the requirements of the preventive test regulations). Summary of the Invention

[0003] The main purpose of this application is to provide a test system for a gas-insulated switchgear cabinet to at least solve the problem of low test efficiency of gas-insulated switchgear cabinets in the prior art.

[0004] To achieve the above object, according to one aspect of this application, a test system for a gas-insulated switchgear cabinet is provided, including: a plurality of gas-insulated switchgear cabinets, where the plurality of gas-insulated switchgear cabinets at least include a first gas-insulated switchgear cabinet and a second gas-insulated switchgear cabinet, and the first gas-insulated switchgear cabinet and the second gas-insulated switchgear cabinet are adjacent; a test instrument electrically connected to any two adjacent gas-insulated switchgear cabinets for testing the gas-insulated switchgear cabinets, and the test is used to detect the functions of the gas-insulated switchgear cabinets; where the first gas-insulated switchgear cabinet and the second gas-insulated switchgear cabinet are both electrically connected to a busbar, and when the first gas-insulated switchgear cabinet serves as a lead for the second gas-insulated switchgear cabinet, the first gas-insulated switchgear cabinet is electrically connected to the busbar as a conductor.

[0005] Optionally, each of the gas-insulated switchgears further includes: a three-position switch including a first end and a second end. The first end of the three-position switch is electrically connected to the busbar. The three-position switch has a closed state, an isolated state, and a grounded state. When the three-position switch is in the closed state, the circuit where the gas-insulated switchgear is located is closed. When the three-position switch is in the isolated state, the circuit where the gas-insulated switchgear is located is disconnected. When the three-position switch is in the grounded state, the gas-insulated switchgear is grounded.

[0006] Optionally, each of the gas-insulated switchgears further includes: a circuit breaker including a first end and a second end. The first end of the circuit breaker is electrically connected to the second end of the three-position switch. The circuit breaker has a closed position state and an open state. Among them, when the circuit breaker of the first gas-insulated switchgear is in the closed position state and the three-position switch of the first gas-insulated switchgear is in the closed state, the first gas-insulated switchgear is electrically connected to the busbar as a conductor. When the circuit breaker of the second gas-insulated switchgear is in the closed position state and the three-position switch of the second gas-insulated switchgear is in the closed state, the second gas-insulated switchgear is electrically connected to the busbar as a conductor.

[0007] Optionally, each of the gas-insulated switchgears further includes: a plug including a first end and a second end. The first end of the plug is electrically connected to the second end of the circuit breaker; a lead wire, and the second end of the plug is electrically connected to the test instrument through the lead wire.

[0008] Optionally, each of the gas-insulated switchgears further includes: a current transformer including a first end and a second end. The first end of the current transformer is electrically connected to the second end of the circuit breaker, and the second end of the current transformer is electrically connected to the first end of the plug.

[0009] Optionally, each of the gas-insulated switchgears further includes: a capacitor module including a first end and a second end. The first end of the capacitor module is electrically connected to the first end of the plug.

[0010] Optionally, each of the gas-insulated switchgears further includes: an indicator light circuit, and the indicator light circuit is connected to the position node of the circuit breaker for indicating the state of the circuit breaker.

[0011] Optionally, the test instrument includes at least one of the following: a vacuum circuit breaker tester, a current transformer tester, a loop resistance measuring instrument, and a withstand voltage tester.

[0012] Optionally, multiple of the gas-insulated switchgears are all 35kV SF6 gas-insulated switchgears.

[0013] Optionally, each of the multiple gas-insulated switchgears includes multiple gas compartments, and each gas compartment is used to store SF6 gas.

[0014] Applying the technical solution of the present application, a gas-insulated switchgear is a metal-sealed switching device. All high-voltage components are enclosed in a gas compartment welded by stainless steel with good airtightness. Each separated gas compartment is filled with SF6 gas. Except for the cable connection points, there are no exposed points between other components. And preventive tests need to be completed by connecting wires at both ends. Therefore, two gas-insulated switchgears are used as a group. Among them, the gas-insulated switchgear serves as the conductor (lead wire) of the second gas-insulated switchgear. The cable connection points of the two gas-insulated switchgears are used as the head and tail ends of the test wiring, and the corresponding test can be completed by avoiding gas extraction and removing components. Description of the Drawings

[0015] The accompanying drawings forming a part of this application are used to provide a further understanding of the application. The schematic embodiments and descriptions thereof of the application are used to explain the application and do not constitute an improper limitation to the application. In the drawings:

[0016] Figure 1 A schematic structural diagram of a test system for a gas-insulated switchgear according to an embodiment of the present application is shown;

[0017] Figure 2 A schematic structural diagram of a gas-insulated switchgear is shown.

[0018] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0019] 10. First gas-insulated switchgear; 11. Second gas-insulated switchgear; 12. Test instrument; 13. Busbar; 14. Three-position switch; 15. Circuit breaker; 16. Plug; 17. Lead wire; 18. Current transformer; 19. Capacitance module; 20. Indicator lamp circuit; 21. Third gas-insulated switchgear; 22. Fourth gas-insulated switchgear; 23. Voltage transformer module; 24. Capacitance; 25. Voltage indicator lamp; 26. First fuse; 27. Second fuse; 28. Varistor. Detailed Embodiments

[0020] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element can be directly on the other element, or there can also be an intermediate element. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element can be "directly connected" to the other element, or "connected" to the other element through a third element.

[0023] Currently, to complete the preventive test for a gas cabinet, generally, the test is completed before the installation of the gas-insulated switchgear or after the SF6 gas in the gas chamber of the gas-insulated switchgear is evacuated and recovered, and the corresponding part is removed for the test. Or, due to difficulties in handover, the test is simply not done. Therefore, such electrical equipment will be in a non-compliant operating state.

[0024] Therefore, in some solutions, the preventive test is not done because of the difficulties in handing over the gas-insulated switchgear. In other solutions, the part of the gas-insulated switchgear that needs to be evacuated for the test is removed for the test. After removal, the SF6 gas of the gas-insulated switchgear also needs to be evacuated and recovered, and then the removed part is tested. This will increase the test cost and test time, and it is very easy to cause equipment accidents due to improper installation, and it will also increase the operation risk.

[0025] As introduced in the background art, the test efficiency of the gas-insulated switchgear in the prior art is relatively low. To solve the above problems, the present application proposes a gas-insulated switchgear and a test system for the gas-insulated switchgear.

[0026] The present application provides a test system for a gas-insulated switchgear, as Figure 1 shown. The test system for the gas-insulated switchgear includes:

[0027] A plurality of gas-insulated switchgears, where at least the plurality of gas-insulated switchgears include a first gas-insulated switchgear 10 and a second gas-insulated switchgear 11, and the first gas-insulated switchgear 10 and the second gas-insulated switchgear 11 are adjacent;

[0028] A test instrument 12, electrically connected to any two adjacent gas-insulated switchgears, for testing the gas-insulated switchgears, and the test is used to detect the functions of the gas-insulated switchgears;

[0029] Specifically, the tests are mainly preventive tests on gas-insulated switchgear, mainly including AC withstand voltage test, circuit breaker characteristic test, conductive loop resistance test, current transformer test, etc.

[0030] Among them, the first gas-insulated switchgear 10 and the second gas-insulated switchgear 11 are both electrically connected to the busbar 13. When the first gas-insulated switchgear 10 serves as the lead for the second gas-insulated switchgear 11, the first gas-insulated switchgear 10 is electrically connected to the busbar 13 as a conductor.

[0031] To further ensure that the gas-insulated switchgear of this solution can be tested more efficiently, while reducing the test difficulty and further improving the test efficiency of the gas-insulated switchgear, when there are two gas-insulated switchgears, the first gas-insulated switchgear can serve as the lead for the second gas-insulated switchgear, and the first gas-insulated switchgear and the second gas-insulated switchgear are adjacent. In this way, two adjacent gas-insulated switchgears can be used, and based on the principle that two adjacent gas-insulated switchgears serve as leads for each other, the preventive test of the gas-insulated switchgear can be completed more efficiently.

[0032] For the above-mentioned test system of gas-insulated switchgear, the gas-insulated switchgear is a metal-sealed switchgear, and all high-voltage components are enclosed in an airtight chamber welded by stainless steel with good airtightness. Each partitioned air chamber is filled with SF6 gas. Except for the cable connection points, there are no exposed points between other components. And the preventive test requires wiring at both ends to be completed. Therefore, two gas-insulated switchgears are used as a group. Among them, the gas-insulated switchgear serves as the conductor (lead) of the second gas-insulated switchgear, and the cable connection points of the two gas-insulated switchgears serve as the head and tail ends of the test wiring, and the corresponding test can be completed by avoiding gas extraction and removing components.

[0033] In an embodiment of the present application, as Figure 1 and Figure 2As shown, each of the above gas-insulated switchgears further includes a three-position switch 14. The three-position switch 14 includes a first end and a second end. The first end of the three-position switch 14 is electrically connected to the above busbar. The three-position switch 14 has a closed state, an isolated state, and a grounded state. When the three-position switch 14 is in the closed state, the circuit where the gas-insulated switchgear is located is closed. When the three-position switch 14 is in the isolated state, the circuit where the gas-insulated switchgear is located is disconnected. When the three-position switch 14 is in the grounded state, the gas-insulated switchgear is grounded. In this embodiment, since the three-position switch has different operating states, without the need for gas extraction and recovery in the gas-insulated switchgear, the existing circuits in the gas-insulated switchgear and the different operating states of the three-position switch can be used to complete the relevant tests of the gas-insulated switchgear according to different switching operations.

[0034] In another embodiment of the present application, as Figure 1 and Figure 2 shown, each of the above gas-insulated switchgears further includes a circuit breaker 15. The circuit breaker 15 includes a first end and a second end. The first end of the circuit breaker 15 is electrically connected to the second end of the three-position switch 14. The circuit breaker 15 has a closed position state and an open state. Among them, when the circuit breaker 15 of the first gas-insulated switchgear 10 is in the closed position state and the three-position switch 14 of the first gas-insulated switchgear 10 is in the closed state, the first gas-insulated switchgear 10 is electrically connected to the busbar 13 as a conductor. When the circuit breaker 15 of the second gas-insulated switchgear 11 is in the closed position state and the three-position switch 14 of the second gas-insulated switchgear 11 is in the closed state, the second gas-insulated switchgear 11 is electrically connected to the busbar 13 as a conductor. In this embodiment, since the circuit breaker has different operating states, without the need for gas extraction and recovery in the gas-insulated switchgear, the existing circuits in the gas-insulated switchgear and the different operating states of the circuit breaker can be used to complete the relevant tests of the gas-insulated switchgear according to different switching operations.

[0035] During the actual test process, based on the first gas-insulated switchgear and the second gas-insulated switchgear being used as leads for each other, the busbar connected to the first gas-insulated switchgear and the second gas-insulated switchgear can be de-energized and handed over. Based on the first gas-insulated switchgear being used as the lead for the second gas-insulated switchgear, the circuit breaker of the first gas-insulated switchgear is in the closed position state, the three-position switch is in the closed state, and the remaining gas-insulated switchgears are not connected to the busbar.

[0036] Specifically, the process of testing the gas-insulated switchgear of this solution is as follows: Consider two adjacent first gas-insulated switchgears and second gas-insulated switchgears as a group. The first gas-insulated switchgear can be regarded as the lead wire of the second gas-insulated switchgear, or the second gas-insulated switchgear can be regarded as the lead wire of the first gas-insulated switchgear. Cut off the power supply of the busbar and hand it over, and remove the primary cables of the first gas-insulated switchgear and the second gas-insulated switchgear. Install special plugs and lead wires, connect the test equipment, and complete the corresponding tests by changing the states of the three-position switch and the circuit breaker.

[0037] In this solution, the test can be completed without pumping air. Consider two switchgears as a whole. The two switchgears under test are connected to the busbar, and the rest of the switchgears are disconnected. The cable connection points of the two switchgears are used as exposed points, and are led out through plugs and lead wires to connect the test equipment. When the first gas-insulated switchgear is used as the lead wire of the second gas-insulated switchgear, the circuit breaker of the first gas-insulated switchgear is in the closed state, and the three-position switch is in the working position (closed state). At this time, the relevant tests of the second gas-insulated switchgear can be completed by opening and closing the circuit breaker and the three-position switch of the second gas-insulated switchgear. Vice versa, the relevant tests of the first gas-insulated switchgear can be completed.

[0038] Specifically, in this solution, it is not necessary to pump air from the gas-insulated switchgear and it is not necessary to disassemble the gas-insulated switchgear to complete the preventive test, which can protect the structure of the gas-insulated switchgear and extend the service life of the gas-insulated switchgear. The gas-insulated switchgear in this solution includes a three-position switch and a circuit breaker, which has strong operability, can reduce the difficulty of preventive tests, shorten the test time, and improve the test efficiency of the gas-insulated switchgear.

[0039] In this solution, the gas-insulated switchgear can be tested without pumping out and recovering the SF6 gas. This can not only avoid the influence of pollution generated during the repeated pumping and installation of SF6 gas on the equipment, but also avoid the influence of SF6 gas leakage on the test personnel, ensuring the safety and reliability of the test.

[0040] To further ensure that the gas-insulated switchgear of this solution can be directly connected to the test instrument and further ensure that the gas-insulated switchgear does not need to be disassembled for testing, as Figure 1 and Figure 2 shown, in another embodiment of the present application, each of the above-mentioned gas-insulated switchgears further includes a plug 16 and a lead wire 17. The plug 16 includes a first end and a second end. The first end of the above-mentioned plug 16 is electrically connected to the second end of the above-mentioned circuit breaker; the second end of the above-mentioned plug 16 is electrically connected to the above-mentioned test instrument 12 through the above-mentioned lead wire 17. In this embodiment, the cable connection points of the gas-insulated switchgear can be matched and fixed through the plug and the lead wire to facilitate wiring for testing during the test process.

[0041] In practical applications, a current transformer is one of the components in a gas-insulated switchgear, and it is also necessary to test the performance of the current transformer in the gas-insulated switchgear. In a specific embodiment of the present application, as Figure 1 and Figure 2 shown, each of the above gas-insulated switchgears further includes a current transformer 18. The current transformer 18 includes a first end and a second end. The first end of the current transformer 18 is electrically connected to the second end of the circuit breaker 15, and the second end of the current transformer 18 is electrically connected to the first end of the plug 16. In this solution, the gas-insulated switchgear includes a current transformer, and a test instrument can be used to test the current transformer in the gas-insulated switchgear, and the current transformer can be tested without removing the gas-insulated switchgear.

[0042] In the circuit of the gas-insulated switchgear, there are actually many devices. There will be interference between different devices during operation, and the current in the gas-insulated switchgear also needs to ensure stability. In another embodiment of the present application, as Figure 1 and Figure 2 shown, each of the above gas-insulated switchgears further includes a capacitor module 19. The capacitor module 19 includes a first end and a second end. The first end of the capacitor module 19 is electrically connected to the first end of the plug 16. In this solution, the capacitor module is actually a part of the gas-insulated switchgear. The current in the gas-insulated switchgear can be filtered through the capacitor module to ensure the stability of the current in the gas-insulated switchgear.

[0043] Specifically, the capacitor module may further include a capacitor. Of course, other devices may also be included.

[0044] In order to facilitate the staff to check the status of the circuit breaker, in a specific implementation manner of the present application, as Figure 1 and Figure 2 shown, each of the above gas-insulated switchgears further includes an indicator light circuit 20. The indicator light circuit 20 is connected to the position node of the circuit breaker 15 and is used to indicate the status of the circuit breaker 15. In this solution, the indicator light circuit has an indicator light with live display, which belongs to a part of the gas-insulated switchgear and can display the position status of the circuit breaker on the panel of the indicator light. By connecting the circuit breaker position node to the indicator light circuit, the status of the circuit breaker can be directly displayed to facilitate the staff to check the status of the circuit breaker.

[0045] Of course, the indicator light can also be electrically connected to the three-position switch and can display the position status of the three-position switch on the panel of the indicator light. By connecting the three-position switch to the indicator light, the status of the three-position switch can be directly displayed to facilitate the staff to check the status of the three-position switch.

[0046] Optionally, as Figure 1 shown, in addition to the first gas-insulated switchgear 10 and the second gas-insulated switchgear 11, the test system further includes a third gas-insulated switchgear 21, a fourth gas-insulated switchgear 22, a fifth gas-insulated switchgear ( Figure 1 and Figure 2 not shown in

[0047] ), etc. There are multiple gas-insulated switchgears, and of course, it is not limited to the above quantity, and there can be other quantities of gas-insulated switchgears.

[0048] The following introduces different test processes:

[0049] Circuit breaker characteristic test: Taking the first gas-insulated switchgear and the second gas-insulated switchgear as a group, the three-position switch of the first gas-insulated switchgear is in the working position, the circuit breaker is in the closed state, the first gas-insulated switchgear serves as the lead of the second gas-insulated switchgear, the test instrument is connected to the cable outlets of the first gas-insulated switchgear and the second gas-insulated switchgear, test plugs and test wires are installed at the cable outlets, and the circuit breaker of the second gas-insulated switchgear is switched on and off to complete the vacuum circuit breaker characteristic test. The test instrument is a high-voltage switch dynamic characteristic tester or a vacuum circuit breaker tester.

[0050] Current transformer test: Taking the first gas-insulated switchgear and the second gas-insulated switchgear as a group, the three-position switches of both cabinets are in the working position, the circuit breaker is in the closed state. When performing the current transformer test on the second gas-insulated switchgear, the secondary winding of the current transformer of the first gas-insulated switchgear is short-circuited. The primary wiring of the test instrument is connected to the cable outlets of the first gas-insulated switchgear and the second gas-insulated switchgear, test plugs and test wires are installed at the cable outlets, and the secondary wiring of the test instrument is connected to the secondary winding of the current transformer. The test instrument is a current transformer tester.

[0051] Conductive loop resistance test: Take the first gas-insulated switchgear and the second gas-insulated switchgear as a group. The three-position switches of both cabinets are in the working position, and the circuit breaker is in the closed state. The test instrument wiring is connected to the cable outlet of the first gas-insulated switchgear and the second gas-insulated switchgear. A test plug and test wire are installed at the cable outlet, and the main circuit conductive resistance of both switchgears is tested together. The test instrument is a circuit breaker conductive loop resistance tester, and the rated current of the test wire is not less than 100A (of course, the rated current is not limited to 100A, and it can also be any other feasible rated current. Different test instruments may have different corresponding rated currents, such as 200A, 300A).

[0052] The first type of withstand voltage test: Take the entire section of the bus as a group. All three-position switches on the bus are in the working position, and the circuit breaker is in the closed state. The test instrument is connected to the cable outlet, and a test plug and test wire are installed at the cable outlet, enabling the withstand voltage test of the circuit breaker and the three-position switch; when the three-position is in the isolated state and the circuit breaker is in the open state (disconnected state), the wiring remains unchanged to complete the withstand voltage test of the lower break of the circuit breaker; when the three-position is in the isolated state and the circuit breaker is in the closed state, the wiring remains unchanged to conduct the withstand voltage test of the lower break of the three-position switch.

[0053] The second type of withstand voltage test: Take the entire section of the bus as a group. Remove the bus voltage transformer. All three-position switches on the bus are in the working state, and the circuit breaker is in the closed state. The test instrument is connected to the outlet of the bus voltage transformer, and a test plug and test wire are installed at the outlet, enabling the withstand voltage test of the circuit breaker and the three-position switch; when the three-position is in the working state and the circuit breaker is in the open state (disconnected state), the wiring remains unchanged to complete the withstand voltage test of the upper break of the circuit breaker; when the three-position is in the isolated position and the circuit breaker is in the open state (disconnected state), the wiring remains unchanged to conduct the withstand voltage test of the upper break of the three-position switch. The test instrument is a series resonance withstand voltage tester, and the rated voltage of the wiring is not less than 120kV. Of course, the rated voltage is not limited to 120kV, and it can also be any other feasible rated voltage. Different test instruments may have different corresponding rated voltages, such as 220kV, 150kV).

[0054] In an optional embodiment of the present application, multiple of the above gas-insulated switchgears are all 35kV SF6 gas-insulated switchgears. The gas-insulated switchgear of the present application is a 35kV SF6 gas-insulated switchgear. Through this test system, preventive tests can be performed on 35kV SF6 gas-insulated switchgears.

[0055] In a specific application, multiple gas-insulated switchgears of the present application each include a plurality of gas compartments, and each of the above gas compartments is used to store SF6 gas. In this solution, since the test of the gas-insulated switchgear can be completed without pumping air in the test system, the SF6 gas in the gas-insulated switchgear during the test can still be retained in the gas-insulated switchgear.

[0056] Specifically, as Figure 1 shown, the test system further includes a voltage transformer module 23. When a withstand voltage test is performed, the voltage transformer module 23 can be disconnected. The voltage transformer module 23 includes a capacitor 24, a plurality of voltage indicator lights 25, a first fuse 26, a second fuse 27, and a varistor 28.

[0057] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0058] The test system of the gas-insulated switchgear of the present application. The gas-insulated switchgear is a metal-sealed switchgear, and all high-voltage components are enclosed in a gas compartment welded by stainless steel with good airtightness. Each separated gas compartment is filled with SF6 gas. Except for the cable connection, there are no exposed points between other components. Since preventive tests require wiring at both ends to be completed, two gas-insulated switchgears are used as a group, where one gas-insulated switchgear serves as the conductor (lead) of the second gas-insulated switchgear, and the cable connection points of the two gas-insulated switchgears serve as the head and tail ends of the test wiring. Corresponding tests can be completed by avoiding pumping air and removing components.

[0059] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A test system for a gas-insulated switchgear, characterized in that, Including: A plurality of gas-insulated switchgear cabinets, wherein the plurality of gas-insulated switchgear cabinets at least include a first gas-insulated switchgear cabinet and a second gas-insulated switchgear cabinet, and the first gas-insulated switchgear cabinet is adjacent to the second gas-insulated switchgear cabinet; A test instrument, electrically connected to any two adjacent gas-insulated switchgear cabinets, for testing the gas-insulated switchgear cabinets. The test is used to detect the functions of the gas-insulated switchgear cabinets. The cable connection points of the two gas-insulated switchgear cabinets serve as the head and tail ends of the test wiring, and the cable connection points of the two gas-insulated switchgear cabinets serve as exposed points, and are led out through plugs and leads to connect the test instrument; Wherein, both the first gas-insulated switchgear cabinet and the second gas-insulated switchgear cabinet are electrically connected to the busbar. When the first gas-insulated switchgear cabinet serves as the lead of the second gas-insulated switchgear cabinet, the first gas-insulated switchgear cabinet is electrically connected to the busbar as a conductor; Each of the gas-insulated switchgear cabinets further includes: A three-position switch, including a first end and a second end. The first end of the three-position switch is electrically connected to the busbar. The three-position switch has a closed state, an isolated state, and a grounded state. When the three-position switch is in the closed state, the circuit where the gas-insulated switchgear cabinet is located is closed. When the three-position switch is in the isolated state, the circuit where the gas-insulated switchgear cabinet is located is disconnected. When the three-position switch is in the grounded state, the gas-insulated switchgear cabinet is grounded; A circuit breaker, including a first end and a second end. The first end of the circuit breaker is electrically connected to the second end of the three-position switch. The circuit breaker has a closed position state and an open state. Among them, when the circuit breaker of the first gas-insulated switchgear cabinet is in the closed position state and the three-position switch of the first gas-insulated switchgear cabinet is in the closed state, the first gas-insulated switchgear cabinet is electrically connected to the busbar as a conductor. When the circuit breaker of the second gas-insulated switchgear cabinet is in the closed position state and the three-position switch of the second gas-insulated switchgear cabinet is in the closed state, the second gas-insulated switchgear cabinet is electrically connected to the busbar as a conductor; A plug, including a first end and a second end; A lead, the second end of the plug is electrically connected to the test instrument through the lead; A current transformer, including a first end and a second end. The first end of the current transformer is electrically connected to the second end of the circuit breaker, and the second end of the current transformer is electrically connected to the first end of the plug; A capacitor module, including a first end and a second end. The first end of the capacitor module is electrically connected to the first end of the plug.

2. The test system for a gas-insulated switchgear according to claim 1, characterized in that, Each of the gas-insulated switchgear cabinets further includes: An indicator light circuit, which is connected to the position node of the circuit breaker and is used to indicate the state of the circuit breaker.

3. The test system for a gas-insulated switchgear according to claim 1, characterized in that, The test instrument includes at least one of the following: a vacuum circuit breaker tester, a current transformer tester, a loop resistance measuring instrument, and a withstand voltage tester.

4. The test system for a gas-insulated switchgear according to claim 1, characterized in that, The plurality of gas-insulated switchgear cabinets are all 35kV SF6 gas-insulated switchgear cabinets.

5. The test system for a gas-insulated switchgear according to claim 4, characterized in that, Each of the multiple gas-insulated switchgears includes multiple gas compartments, and each of the gas compartments is used to store SF6 gas.

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