Capacity regulating switch test system and method

Abstract

The invention discloses a capacity-regulating switch test system and method, and the system comprises a capacity-regulating transformer, a capacity-regulating switch is electrically connected in a plugging manner through a capacity-regulating switch placement box, the capacity-regulating transformer is electrically connected with the capacity-regulating switch placement box, and the capacity-regulating switch placement box is in electrical butt joint with a test board through a cable and a control line. The test board is in communication connection with the terminal, and the capacity regulating transformer, the distribution transformer and the pump are respectively and independently arranged. The system has the beneficial effects that the capacity regulating transformer oil tank and the capacity regulating switch oil tank are separately designed, so that the capacity regulating switch can be independently disassembled and assembled, and the capacity regulating switch can be conveniently detected in batches and can be conveniently observed and measured through the transparent top cover and the lifting support which are arranged on the capacity regulating switch placing box; the wiring adjustment of the capacity-adjusting switch can be carried out in the capacity-adjusting switch placing box, so that the operation with oil in the oil tank is avoided; according to the method, test items are sorted in sequence, classified and overall planned, and repeated equipment disassembly and assembly and wiring in the test process are avoided.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a test system and method for adjusting capacity switches. Background Technology

[0002] Conventional transformers have only one capacity, while adjustable-capacity transformers can automatically adjust their capacity according to the load size, thus avoiding the "overloaded" phenomenon caused by too small a load. Adjusting to a smaller capacity can effectively reduce the transformer's no-load loss. Therefore, adjustable-capacity transformers are widely used in public power distribution networks and industrial and mining enterprises. The adjustable-capacity switch is the main component of the adjustable-capacity transformer. Various tests on the adjustable-capacity switch must be carried out after connecting it to the adjustable-capacity transformer. After the adjustable-capacity switch and the adjustable-capacity transformer are connected, they are installed together in a transformer oil tank. The top of the oil tank is covered with high-voltage and low-voltage porcelain insulators. During the test, it is impossible to observe the switch's action and the arcing situation, which is inconvenient for measurement. Moreover, after testing one switch, the switch and the adjustable-capacity transformer must be lifted out of the oil tank, the switch removed, and another switch installed and reconnected to the adjustable-capacity transformer before testing can be carried out. Therefore, the current testing process for adjustable-capacity switches is cumbersome. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that the regulating switches need to be debugged one by one before use. In the prior art, after each installation, the successfully debugged switch needs to be removed from the oil tank and another switch needs to be installed and reconnected to the regulating transformer before the test can be carried out. The testing process is cumbersome.

[0004] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a capacity adjustment switch test system, which includes a capacity adjustment transformer, a capacity adjustment switch is electrically connected to a capacity adjustment switch placement box, the capacity adjustment transformer is electrically connected to the capacity adjustment switch placement box, the capacity adjustment switch placement box is electrically connected to the test bench through cables and control lines, the test bench is communicatively connected to a terminal, and the capacity adjustment transformer, distribution transformer and pump are set up independently.

[0005] In a preferred embodiment of the capacity-adjusting switch testing system of the present invention: the capacity-adjusting transformer includes an oil tank, which contains insulating oil and a transformer body, and a first high-voltage porcelain bushing and a first low-voltage porcelain bushing are provided on the oil tank. The first three phases of the high-voltage winding of the transformer body are led out through the first high-voltage porcelain bushing, and the first and second phases of the series-parallel connection of the three phases of the low-voltage winding of the transformer body and the sealing point are led out through the first low-voltage porcelain bushing. The porcelain insulators on the first high-voltage porcelain bushing and the first low-voltage porcelain bushing are all installed on the top cover of the oil tank.

[0006] In a preferred embodiment of the capacity adjustment switch testing system of the present invention: the first and last ends of the three phases of the high voltage winding of the transformer body are led out through a total of 6 first high voltage porcelain bushings, and the first and last ends of the three phases of the low voltage winding of the transformer body and the sealing point are led out through a total of 13 first low voltage porcelain bushings.

[0007] In a preferred embodiment of the capacity-adjustable switch testing system of the present invention: the side of the capacity-adjustable switch placement box is provided with a second high-voltage porcelain insulator bushing, a second low-voltage porcelain insulator bushing, and a secondary output terminal. The second high-voltage porcelain insulator bushing, the second low-voltage porcelain insulator bushing, and the secondary output terminal are connected to the first high-voltage porcelain insulator bushing and the first low-voltage porcelain insulator bushing, respectively. The box body is also provided with a clamping device that is adjusted by a bolt group. The clamping device limits and fixes the capacity-adjustable switch. The box body is provided with insulating oil.

[0008] In a preferred embodiment of the adjustable capacity switch testing system of the present invention: a transparent top cover is provided on the top of the box body.

[0009] In a preferred embodiment of the capacity adjustment switch testing system of the present invention: a liftable bracket is provided at the bottom of the capacity adjustment switch placement box.

[0010] In a preferred embodiment of the adjustable-capacity switch testing system of the present invention: the test bench integrates a loop resistance tester, a DC resistance tester, an oscilloscope, an adjustable-capacity controller, a power frequency withstand voltage tester, a load test controller, a lightning impulse controller, a short-circuit current test controller, a temperature tester, and voltage and current transformer measuring accessories and auxiliary tools. The test bench is also externally connected to a step-up transformer, a lightning discharge device, a load box, a short-circuit test transformer, and a temperature probe.

[0011] In a preferred embodiment of the adjustable switch test system of the present invention: the oscilloscope, adjustable controller, load test controller, lightning impulse controller, short circuit current test controller, and temperature tester are connected via RS-485 bus and electrically connected to the terminal via a 485 to USB connector, and the secondary wires of the adjustable controller are connected to the secondary output terminals.

[0012] In a preferred embodiment of the adjustable capacity switch testing system of the present invention: the terminal reads the switching timing of the adjustable capacity switch contacts detected in the oscilloscope via a 485 to USB connector and an RS-485 bus, reads the number of times the adjustable capacity switch operates and its current capacity status information detected by the adjustable capacity controller, reads the voltage-time curve in the lightning impulse controller test, reads the short-circuit current-time curve collected by the short-circuit current test controller during the short-circuit test, and reads the temperature of the contacts and the insulating oil near them, the transition resistance temperature and the insulating oil near them tested by the temperature tester. The terminal processes, analyzes, displays, and automatically generates test data and test reports.

[0013] A method for testing a capacitance-adjustable switch, comprising:

[0014] S1: Before the regulating switch is installed in the regulating switch placement box, a visual inspection test is performed, and the switch contact pressure is tested with a force gauge in the test bench. The contact gap is tested with calipers and feeler gauges of the auxiliary tools, the contact resistance is tested with a loop resistance tester, the transition resistance is tested with a DC resistance tester, and the switch transmission torque is tested with a torque wrench. The switch oil chamber pressure and vacuum test are performed by connecting an external pump, which includes an air pump and a vacuum pump, and a pressure gauge is connected to test.

[0015] S2: Place the regulating switch in the regulating switch housing and fix it with a clamping device. Connect the high-voltage side and low-voltage side of the regulating switch to the internal terminals of the second high-voltage porcelain bushing and the second low-voltage porcelain bushing arranged on the side of the regulating switch housing according to the working principle. Connect the secondary control line of the switch to the secondary output terminal arranged on the side of the regulating switch housing according to the definition. After injecting insulating oil into the regulating switch housing, close the transparent top cover. Use the high-voltage and low-voltage bushings as interfaces to conduct an insulation test through the power frequency withstand voltage tester and the step-up transformer in the test bench. Issue a regulating action command through the regulating controller in the test bench. Use an oscilloscope to test the switching contact transition sequence. Send the action number and time interval command to the regulating controller through the terminal. The regulating controller performs mechanical life related action tests according to the command.

[0016] S3: Connect the low-voltage output terminal of the distribution transformer to the working power supply, and connect the high-voltage output terminal to the three first high-voltage porcelain bushings at the beginning of the high-voltage coil inside the regulating transformer. Connect the three first low-voltage porcelain bushings at the beginning and end of the three-phase series-parallel section of the low-voltage winding of the transformer body, which belong to the beginning of the first series-parallel section, and the one porcelain bushing connected to the sealing point, to the load box for contact temperature rise test, transition resistance temperature rise test, and load switching test. During the test, the load box is controlled by the load test controller to adjust the load. During the contact temperature rise test and transition resistance temperature rise test, the temperature probe can be placed in the corresponding position inside the switch by opening the transparent top cover.

[0017] S4: When conducting the final short-circuit current test, disconnect the external wiring of the regulating switch placement box used in the above tests. When conducting the high-voltage side short-circuit current test, connect the output terminal of the short-circuit test transformer to any two phases of the second high-voltage porcelain bushing on the regulating switch placement box, and short-circuit the other two phases of the porcelain bushing. Send the test current and start command to the short-circuit current controller through the terminal. The short-circuit current controller controls the short-circuit test transformer to conduct the test. When conducting the low-voltage side short-circuit current test, connect the output terminal of the short-circuit test transformer to the first phase A and the second phase C of the second low-voltage porcelain bushing on the regulating switch placement box. Send the test current and start command to the short-circuit current controller through the terminal. The short-circuit current controller controls the short-circuit test transformer to conduct the test.

[0018] The beneficial effects of this invention are as follows: The system separates the transformer oil tank and the transformer switch oil tank, which facilitates the individual disassembly and assembly of the transformer switch and is more conducive to the batch testing of transformer switches. The transparent top cover and lifting bracket of the transformer switch placement box make it easier to observe and measure the transformer switch. During the test, the wiring adjustment of the transformer switch can be carried out in the porcelain bushing of the transformer switch placement box, avoiding operation with oil in the oil tank. The transformer switch testing system uses a terminal to save test data and automatically generate test reports, making the testing work more convenient. The method sorts and organizes the test items according to their order, avoiding repeated disassembly and assembly of equipment and wiring during the test. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0020] Figure 1 A system structure diagram of a capacity adjustment switch test system is shown;

[0021] Figure 2 A cross-sectional view of a variable-capacity transformer is shown;

[0022] Figure 3 A top view of a variable-capacity transformer is shown;

[0023] Figure 4 A communication wiring diagram of a capacity adjustment switch test system is shown.

[0024] Figure 5 The diagram shows the installation box for the capacity regulating switch, the capacity regulating transformer, and the wiring diagram for the capacity regulating switch.

[0025] Figure 6 The circuit diagram for the load test is shown;

[0026] Figure 7 The short-circuit current test circuit is shown;

[0027] Figure 8 A sequence diagram of the test method steps is shown. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0029] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0030] Example 1

[0031] Reference Figure 1 This embodiment provides a capacity adjustment switch testing system, including a capacity adjustment transformer 1, a capacity adjustment switch 3 connected to a capacity adjustment switch placement box 2 via a plug-in electrical connection, a capacity adjustment transformer 1 and a capacity adjustment switch placement box 2 electrically connected to a test bench 4 via cables and control lines, a test bench 4 being communicatively connected to a terminal 5, a capacity adjustment transformer 1, a distribution transformer 6 and a pump 7 being independently set up, a pump 7 including an air pump and a vacuum pump, an auxiliary mobile device placed on the ground of the test site, and a distribution transformer 6 placed independently outside the test bench in the test area.

[0032] In use, the adjustable transformer 1 must be adjusted through the adjustable switch 3 to achieve the desired capacity. Many tests of the adjustable switch 3 also require the transformer to be used. Conventional adjustable transformer 1 and adjustable switch 3 are installed in the same oil tank, and their appearance is the same as ordinary transformers. Many tests are inconvenient to perform. In this system, the adjustable transformer 1 and adjustable switch 3 are set up separately. The adjustable transformer 1 still retains the complete electromagnetic structure, but only serves as a high-voltage / low-voltage interface source. The adjustable switch 3 is connected to the adjustable switch placement box 2 by plug-in electrical connection. The adjustable switch 3 is placed separately in the adjustable switch placement box 2 and can be quickly connected to the transformer body, load box and short-circuit test transformer through two sets of pluggable porcelain bushings.

[0033] Example 2

[0034] Reference Figures 2-7 As an optional embodiment, the adjustable-capacity transformer 1 includes an oil tank 12, which contains insulating oil and a transformer body 11. The oil tank 12 is equipped with a first high-voltage porcelain bushing 14 and a first low-voltage porcelain bushing 15. The first and last ends of the three-phase high-voltage winding of the transformer body 11 are led out through the first high-voltage porcelain bushing 14. The first and last ends of the three-phase series-parallel connection section of the low-voltage winding of the transformer body 11 and the sealing point are led out through the first low-voltage porcelain bushing 15. The porcelain bushings on the first high-voltage porcelain bushing 14 and the first low-voltage porcelain bushing 15 are all mounted on the top cover of the oil tank 12.

[0035] Furthermore, the transformer body 11 is composed of an iron core and high-voltage and low-voltage windings, etc. The three-phase starting ends A1, A2, B1, B2, C1, and C2 of the high-voltage winding of the transformer body 11 are led out through 6 first high-voltage porcelain bushings 14. The three-phase series-parallel connection ends a1 to c4 of the low-voltage winding of the transformer body 11 and the star point 0 are led out through 13 first low-voltage porcelain bushings 15.

[0036] Preferably, the side of the box body 21 of the variable capacity switch placement box 2 is provided with a second high-voltage porcelain insulator bushing 22, a second low-voltage porcelain insulator bushing 23, and a secondary output terminal 24. That is, the side of the box body 21 is provided with 6 high-voltage porcelain insulator bushings A1, A2, B1, B2, C1, C2 and 12 low-voltage porcelain insulator bushings a1 to c4 and a secondary output terminal 24. The second high-voltage porcelain insulator bushing 22, the second low-voltage porcelain insulator bushing 23 and the secondary output terminal 24 are connected to the first high-voltage porcelain insulator bushing 14 and the first low-voltage porcelain insulator bushing 15 one by one. The box body 21 is also provided with a clamping device 25 that is adjusted by a bolt group. The clamping device 25 limits and fixes the variable capacity switch 3. The clamping device 25 is composed of a switch fixing frame and bolts. Each switch fixing frame is provided with a threaded hole. The tightness of the clamping device 25 can be adjusted by rotating the bolts, so as to be compatible with different models of variable capacity switches 3. The box body 21 is provided with insulating oil.

[0037] In use, the system physically separates the capacity regulating transformer 1 and the capacity regulating switch 3, and the oil tank 12 and the tank body 21 are designed separately, which facilitates the individual disassembly and assembly of the capacity regulating switch 3 and makes it easier to conduct batch testing of the capacity regulating switch 3.

[0038] Example 3

[0039] Reference Figure 4 As an optional embodiment, a transparent top cover 26 is provided on the top of the box body 21. In this embodiment, the transparent top cover 26 is made of plexiglass. The transparent top cover 26 provided with the box 2 makes it easier to observe and measure the capacity adjustment switch 3 by placing the capacity adjustment switch 3 through the capacity adjustment switch.

[0040] The rest of the structure is the same as in Example 2.

[0041] Example 4

[0042] As an optional embodiment, the lower part of the box body 21 of the regulating switch placement box 2 is provided with a liftable bracket. The lower part of the box body 21 can be equipped with a liftable bracket to facilitate height adjustment to adapt to wiring or observation requirements.

[0043] The rest of the structure is the same as in Example 2.

[0044] Example 5

[0045] As an optional embodiment, the test bench 4 integrates a loop resistance tester, a DC resistance tester, an oscilloscope, a capacity adjustment controller, a power frequency withstand voltage tester, a load test controller, a lightning impulse controller, a short circuit current test controller, a temperature tester, and voltage and current transformer measuring accessories and auxiliary tools. The wiring clips of the aforementioned testers and controllers extend outward from the test bench 4. The test bench 4 is also connected to a step-up transformer, a lightning discharge device, a load box, a short circuit test transformer, a temperature probe, and auxiliary tools including a force gauge, calipers, feeler gauges, a torque wrench, and a pressure gauge.

[0046] Preferably, the oscilloscope, capacity control, load test controller, lightning impulse controller, short circuit current test controller, and temperature tester are connected via an RS-485 bus and electrically connected to terminal 5 via a 485 to USB connector. The secondary wires of the capacity control are connected to the secondary output terminal 24.

[0047] Preferably, terminal 5 reads the contact switching timing of the regulating switch 3 detected in the oscilloscope via a 485 to USB connector and an RS-485 bus, reads the number of times the regulating switch 3 operates and its current capacity status detected by the regulating controller, reads the voltage-time curve in the lightning impulse controller test, reads the short-circuit current-time curve collected by the short-circuit current test controller during the short-circuit test, and reads the temperature of the contacts and the insulating oil near them, the transition resistance temperature and the insulating oil near them tested by the temperature tester. Terminal 5 processes, analyzes, displays, and automatically generates test data and test reports.

[0048] Example 6

[0049] This embodiment is based on the previous embodiment, and differs from the previous embodiment in that:

[0050] Testing methods for the testing system:

[0051] The first step is to conduct a visual inspection test on the capacity regulating switch 3 before installing it in the capacity regulating switch placement box 2. The pressure of the switch contacts is tested using a force gauge in the toolbox of the comprehensive test bench. The contact gap is tested using calipers, feeler gauges and other tools. The contact resistance is tested using a loop resistance tester. The transition resistance is tested using a DC resistance tester. The torque of the switch transmission is tested using a torque wrench. The switch oil chamber pressure and vacuum test are conducted by connecting an external air pump and vacuum pump, and a pressure gauge in the toolbox is connected to the test.

[0052] The second step involves placing the regulating switch 3 inside the regulating switch housing 2 and securing it with the fastening bracket and bolts in the clamping device 25. The high-voltage and low-voltage sides of the regulating switch 3 are connected to the internal terminals of the six high-voltage porcelain bushings A1, A2, B1, B2, C1, C2 and the twelve low-voltage porcelain bushings a1 to c4 arranged on the side of the housing. The secondary control lines of the switch are connected to the secondary output terminals 24 arranged on the side of the housing according to the definition. After filling the regulating switch housing 2 with oil, the transparent top cover 26 is closed. Using the high and low voltage bushings A1, A2, B1, B2, C1, C2 and a1 to c4 as interfaces, an insulation test is performed using the power frequency withstand voltage tester and step-up transformer in the integrated test bench. A regulating action command is issued through the regulating controller in the integrated test bench. The switching contact transition sequence is tested using an oscilloscope. The number of actions and time interval instructions are sent to the regulating controller through terminal 5. The regulating controller performs mechanical life and other related action tests according to the commands.

[0053] The third step is to connect the low-voltage output terminals a, b, c, and 0 of distribution transformer 6 to a 380V three-phase four-wire power supply. Connect the high-voltage output terminals A, B, and C to the three high-voltage porcelain bushings (A1, B1, and C1) inside the regulating transformer 1, which are connected to the high-voltage coil. Connect the four low-voltage porcelain bushings (a1, b1, c1, and 0) inside the regulating transformer 1, which are connected to the three-phase series-parallel section I of the low-voltage winding, to the load box 12. In this way, through distribution transformer 6, whose rated current is not less than the rated current of the measured switch, the AC380V mains voltage can be stepped up to 10kV. Applying a 10kV voltage to the regulating transformer 1 and regulating switch 3 can simulate the voltage when the regulating switch 3 is working normally. The low-voltage side of the regulating transformer 1 is connected to the load box 12. By sending a load power adjustment command to the load test controller through the terminal 5, the operating current of the regulating switch 3 can also reach the current required for the load test. With the above settings, contact temperature rise test, transition resistance temperature rise test, load switching test, contact temperature rise test, and transition resistance temperature rise test can be performed. During the test, the temperature probe can be placed in the corresponding position inside the switch by opening the transparent top cover 26.

[0054] The fourth step is to conduct a short-circuit current test. Since the short-circuit test is destructive, it is performed last. Remove the external wiring used in the previous steps for testing the regulating switch box 2. For the high-voltage side short-circuit current test, connect the output of the short-circuit test transformer to any two of the six high-voltage porcelain bushings. In this embodiment, connect A1 and A2 of phase A, and short-circuit the other two phases' porcelain bushings respectively, i.e., short-circuit B1 and B2 and C1 and C2 respectively. Send the test current and start command to the short-circuit current controller via terminal 5. The short-circuit current controller controls the short-circuit test transformer to conduct the test on the low-voltage side. During the short-circuit current test, the output terminal of the short-circuit test transformer is connected to the first one of phase A (A1) and the second one of phase C (C2). The test current and start command are sent to the short-circuit current controller through terminal 5. The short-circuit current controller controls the above-mentioned short-circuit test transformer to carry out the test. It should be noted that during the short-circuit current test, the high- and low-voltage side contacts of the regulating switch 3 are in the large-capacity state, and there is no need to switch to the small-capacity state for the test. This is because the large short-circuit test current in the large-capacity state can represent the dynamic and thermal stability of the internal circuit and contacts of the switch under the short-circuit current.

[0055] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A capacity-adjustable switch testing system, characterized in that: include, The capacity-adjusting transformer (1) and the capacity-adjusting switch (3) are electrically connected by a plug-in type through the capacity-adjusting switch placement box (2). The capacity-adjusting transformer (1) is electrically connected to the capacity-adjusting switch placement box (2). The capacity-adjusting switch placement box (2) is electrically connected to the test bench (4) through a cable and a control line. The test bench (4) is communicatively connected to the terminal (5). The capacity-adjusting transformer (1), the distribution transformer (6), and the pump (7) are set up independently.

2. The capacity adjustment switch testing system according to claim 1, characterized in that: The adjustable transformer (1) includes an oil tank (12), which contains insulating oil and a transformer body (11). The oil tank (12) is equipped with a first high-voltage porcelain bushing (14) and a first low-voltage porcelain bushing (15). The first and last ends of the three-phase high-voltage winding of the transformer body (11) are led out through the first high-voltage porcelain bushing (14). The first and last ends of the three-phase series-parallel connection section and the sealing point of the low-voltage winding of the transformer body (11) are led out through the first low-voltage porcelain bushing (15). The porcelain bushings on the first high-voltage porcelain bushing (14) and the first low-voltage porcelain bushing (15) are all installed on the top cover of the oil tank (12).

3. The capacity adjustment switch testing system according to claim 2, characterized in that: The high-voltage winding of the transformer body (11) is led out through 6 first high-voltage porcelain bushings (14) at the beginning and end of the three-phase high-voltage winding, and the low-voltage winding of the transformer body (11) is led out through 13 first low-voltage porcelain bushings (15) at the beginning and end of the three-phase series-parallel connection section and the star-sealing point.

4. The capacity adjustment switch testing system according to claim 3, characterized in that: The side of the box body (21) of the regulating switch placement box (2) is provided with a second high-voltage porcelain insulator sleeve (22), a second low-voltage porcelain insulator sleeve (23), and a secondary output terminal (24). The second high-voltage porcelain insulator sleeve (22), the second low-voltage porcelain insulator sleeve (23), and the secondary output terminal (24) are connected to the first high-voltage porcelain insulator sleeve (14) and the first low-voltage porcelain insulator sleeve (15) one by one. The box body (21) is also provided with a clamping device (25) that is adjusted by a bolt group. The clamping device (25) limits and fixes the regulating switch (3). The box body (21) is provided with insulating oil.

5. The capacity adjustment switch testing system according to claim 4, characterized in that: A transparent top cover (26) is provided on the top of the box body (21).

6. The capacity adjustment switch testing system according to claim 4, characterized in that: The lower part of the regulating switch placement box (2) is provided with a liftable bracket.

7. The capacity adjustment switch testing system according to claim 1, characterized in that: The test bench (4) integrates a loop resistance tester, a DC resistance tester, an oscilloscope, a capacity adjustment controller, a power frequency withstand voltage tester, a load test controller, a lightning impulse controller, a short circuit current test controller, a temperature tester, and voltage and current transformer measuring accessories and auxiliary tools. The test bench (4) is also externally connected to a step-up transformer, a lightning discharge device, a load box, a short circuit test transformer, and a temperature probe.

8. The capacity adjustment switch testing system according to claim 7, characterized in that: The oscilloscope, capacity controller, load test controller, lightning impulse controller, short circuit current test controller, and temperature tester are connected via an RS-485 bus and electrically connected to the terminal (5) via a 485 to USB connector. The secondary wires of the capacity controller are connected to the secondary output terminals (24).

9. The capacity adjustment switch testing system according to claim 8, characterized in that: The terminal (5) reads the contact switching timing of the regulating switch (3) detected in the oscilloscope through the 485 to USB connector and the RS-485 bus, reads the number of times the regulating switch (3) operates and the size and capacity status information detected by the regulating controller, reads the voltage-time curve in the lightning impulse controller test, reads the short-circuit current-time curve collected by the short-circuit current test controller during the short-circuit test, and reads the temperature of the contacts and the insulating oil near them, the transition resistance temperature and the insulating oil near them tested by the temperature tester. The terminal (5) processes, analyzes, displays, and automatically generates test data and test reports.

10. A method for testing a capacity-adjustable switch, characterized in that: Based on the capacity adjustment switch test system according to any one of claims 1 to 9, the method includes: S1: Before the regulating switch (3) is installed in the regulating switch placement box (2), an appearance inspection test is performed by visual inspection, and the switch contact pressure is tested by the force gauge in the test bench (4), the contact gap is tested by the calipers and feeler gauges of the auxiliary tools, the contact resistance is tested by the circuit resistance tester, the transition resistance is tested by the DC resistance tester, and the switch transmission torque is tested by the torque wrench. The switch oil chamber pressure and vacuum test are performed by connecting the external pump (7), which includes an air pump and a vacuum pump, and a pressure gauge is connected to test. S2: Place the regulating switch (3) in the regulating switch placement box (2) and fix it with the clamping device (25). Connect the high voltage side and low voltage side of the regulating switch (3) to the second high voltage porcelain bushing (22) and the second low voltage porcelain bushing (23) arranged on the side of the box body (21) of the regulating switch placement box (2) according to the working principle. Connect the secondary control line of the switch to the secondary output terminal (24) arranged on the side of the box body (21) of the regulating switch placement box (2) according to the definition. After injecting insulating oil into the regulating switch placement box (2), close the transparent top cover (26). Use the high and low voltage bushings as interfaces to conduct insulation tests through the power frequency withstand voltage tester and step-up transformer in the test bench (4). Send the regulating action command through the regulating controller in the test bench (4). Use an oscilloscope to test the switching contact conversion sequence. Send the action number and time interval command to the regulating controller through the terminal (5). The regulating controller performs mechanical life related action tests according to the command. S3: Connect the low-voltage output terminal of the distribution transformer (6) to the working power supply, and the high-voltage output terminal to the three first high-voltage porcelain bushings (14) connected to the first end of the high-voltage coil inside the regulating transformer (1). Connect the three first low-voltage porcelain bushings (15) of the first end of the three-phase series-parallel section of the low-voltage winding of the transformer body (11), the three belonging to the first end of the first series-parallel section, and the one porcelain bushing connected to the sealing star point, to the load box for contact temperature rise test, transition resistance temperature rise test, and load switching test. During the test, the load box is controlled by the load test controller to adjust the load. During the contact temperature rise test and transition resistance temperature rise test, the temperature probe can be placed in the corresponding position inside the switch by opening the transparent top cover (26). S4: When conducting the final short-circuit current test, disconnect the external wiring of the regulating switch placement box (2) used in the above test. When conducting the high-voltage side short-circuit current test, connect the output terminal of the short-circuit test transformer to any two phases of the second high-voltage porcelain bushing (22) on the regulating switch placement box (2), and short-circuit the other two phase porcelain bushings respectively. Send the test current and start command to the short-circuit current controller through the terminal (5). The short-circuit current controller controls the short-circuit test transformer to conduct the test. When conducting the low-voltage side short-circuit current test, connect the output terminal of the short-circuit test transformer to the first one of phase A and the second one of phase C of the second low-voltage porcelain bushing (23) on the regulating switch placement box (2). Send the test current and start command to the short-circuit current controller through the terminal (5). The short-circuit current controller controls the short-circuit test transformer to conduct the test.

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