High-voltage switchgear dynamic and thermal stability test platform

Abstract

The utility model discloses a high voltage switchgear dynamic thermal stability test platform, comprising a short circuit transformer TM, a primary side main loop, a secondary side main loop, and a test station ST, the primary side of the short circuit transformer TM is provided with three primary side windings which are connected in parallel, the input voltage is 24.6 kV, the secondary side is provided with six secondary side windings, the input voltage is 24.6 kV, and the test station ST is provided with three secondary side windings which are connected in parallel. Two ends of each secondary side winding are respectively connected with one secondary side winding isolating switch, one secondary side winding isolating switch is arranged between two adjacent secondary side windings, the secondary side winding isolating switches are connected with a PLC (Programmable Logic Controller), and the PLC is connected with a control computer; and the PLC controller enables the six secondary side windings to form different series or parallel circuits by controlling the on and off of the secondary side winding isolation switches, and outputs six different secondary side output voltages of 1.5 kV, 3 kV, 4.5 kV, 6 kV, 7.5 kV and 9 kV. And the test main loop and the transformer secondary side wiring can be sequentially overlapped by one key according to test parameters, so that the test cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical performance test devices, in particular to a dynamic thermal stability test platform for high-voltage switchgear. Background Art

[0002] Short-circuit accidents are inevitable during power system operation. To assess the dynamic and thermal stability of electrical equipment such as high-voltage switchgear, circuit breakers, and busbars under short-circuit conditions, dynamic thermal stability tests, including short-time withstand current tests and peak withstand current tests, are required. The short-time withstand current test tests the effective current that the switchgear can withstand in the closed position within a specified time under specified operating and performance conditions to ensure safe operation within the specified time. The peak withstand current test, on the other hand, verifies the current peak of the first large half-wave of the rated short-time withstand current that the switchgear can withstand in the closed position under the same conditions.

[0003] At present, the switchgear dynamic thermal test platform is capable of completing dynamic thermal stability tests of single-phase products of high-voltage switchgear of 363kV and below. The maximum test current reaches 80kA / 4s at 4.5kV and 40kA / 4s at 9kV, and the maximum long-term operating current is 2700A.

[0004] Patent CN117491861A discloses a "Dynamic Thermal Stability Test Device for Cable Terminals of High-Voltage Switches". This application is used to form a short-circuit circuit for the three-phase conductors of the cable terminal of a high-voltage switch, and includes a conductor assembly and a three-phase short-circuit board. The conductor assembly includes three connecting conductors, and the first connecting ends of the three connecting conductors are used to correspond one-to-one and electrically connect to the three interfaces of the three-phase conductors. When the connecting conductors are connected to the three-phase conductors, the first connecting end is located inside the shell, and the second connecting end away from the first connecting end is located outside the shell. The three-phase short-circuit board is provided with three short-circuit points, which correspond one-to-one with the second connecting end and are electrically connected to form a short-circuit circuit. The electrical connection between the connecting conductors and the three-phase conductors can effectively simulate the on-site cable plug-in conditions at the three-phase conductors of the cable terminal under actual working conditions, thereby improving the integrity of the test conditions for the dynamic thermal stability test. In addition, the connection point of the short-circuit circuit is located outside the shell, so that on-site test debugging does not require opening the shell, reducing the difficulty of debugging.

[0005] This test device is suitable for use when the test sample access voltage is a fixed value. Different test platforms are required for dynamic thermal tests with multiple voltage requirements.

[0006] Patent CN210349550U discloses "A New Low-voltage and Dynamic Thermal Stability Test Transformer". The test transformer includes an outer shell and internal components. The internal components include three bodies, namely body a, body b and body c. The body a, body b and body c are arranged in a herringbone shape inside the test transformer, and the iron cores of the three bodies are relatively independent. The bottom plate of the outer shell adopts a flat design, making the transformer as a whole easier to install and more stable. The transformer design of this utility model makes full use of space and adopts a herringbone shape arrangement. It is small in size. The transformer contains three bodies inside. The iron core of each body is relatively independent. Each body adopts a single-phase single-column with side yoke structure. The three bodies share an oil tank. This structure can meet the needs of simultaneous power supply of the three bodies during three-phase testing, and can also meet the needs of two bodies running under power during single-phase testing. It has a wider range of applicable tests.

[0007] The transformer disclosed in this utility model is suitable for low-voltage test conditions, but cannot meet the test requirements for high-voltage conditions. Utility Model Content

[0008] The purpose of the utility model is to provide a dynamic thermal stability test platform for high-voltage switchgear. The short-circuit transformer can provide different high-voltage power supplies for the test product, and the test main circuit and the transformer secondary side wiring can be connected in sequence with one click according to the dynamic thermal stability test parameters of the high-voltage switchgear.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0010] A dynamic thermal stability test platform for high-voltage switchgear includes a short-circuit transformer TM. The primary input end of the short-circuit transformer TM is connected to the primary main circuit, the secondary output end of the short-circuit transformer TM is connected to the secondary main circuit, and the secondary main circuit is connected to a test station ST. The primary side of the short-circuit transformer TM is provided with three primary windings connected in parallel, the input voltage is 24.6kV, and the secondary side is provided with six secondary windings. The two ends of each secondary winding are respectively connected to a secondary winding isolating switch, and the two adjacent A secondary winding isolating switch is installed between the secondary windings. All secondary winding isolating switches are integrated into the valve island box VT2. The secondary winding isolating switches in the valve island box VT2 are connected to the PLC controller, and the PLC controller is connected to the control computer. The PLC controller controls the opening and closing of the secondary winding isolating switches to make the six secondary windings form different series or parallel circuits and output six different secondary output voltages of 1.5kV, 3kV, 4.5kV, 6kV, 7.5kV and 9kV.

[0011] Preferably, the primary side main circuit includes two input lines connected to the high voltage power supply, and each input line is provided with a circuit breaker QF, a reactor L, a primary side disconnector QS and a current transformer TA connected in series in sequence. The two ends of the reactor L are connected in parallel with the shunt disconnector QS, and a phase selection switch MS is also connected in series between the circuit breaker QF and the reactor L on one of the lines.

[0012] Preferably, the secondary side main circuit includes two output lines connected to the sample test station ST, each output line is provided with a secondary side first isolating switch QS, a Rogowski coil Rct and a secondary side second isolating switch QS which are connected in series in sequence, and the secondary side second isolating switch QS is grounded.

[0013] Preferably, the secondary winding includes winding xa1, winding xa2, winding xa3, winding xa4, winding xa5 and winding xa6, the a1 end of winding xa1 is connected to one end of the secondary side isolation switch QS20, the x1 end of winding xa1 is connected to one end of the secondary side winding isolation switch QS19 and the secondary side winding isolation switch QS25, and the other end of the secondary side winding isolation switch QS25 is connected to the a2 end of winding xa2; the a2 end of winding xa2 is also connected to one end of the secondary side winding isolation switch QS18, and the x2 end of winding xa2 is connected to the secondary side winding isolation switch QS17 and the secondary side winding isolation switch QS25. The secondary winding isolating switch QS24 is connected to one end of the secondary winding, and the other end of the secondary winding isolating switch QS24 is connected to the a3 end of the winding xa3; the a3 end of the winding xa3 is connected to one end of the secondary winding isolating switch QS16, the x3 end of the winding xa3 is connected to the secondary winding isolating switch QS15 and one end of the secondary winding isolating switch QS23, and the other end of the secondary winding isolating switch QS23 is connected to the a4 end of the winding xa4; the a4 end of the winding xa4 is connected to one end of the secondary winding isolating switch QS14, and the x4 end of the winding xa4 is connected to the secondary winding isolating switch QS13 and the secondary winding isolating switch QS23. One end of the secondary winding isolation switch QS22 is connected to the a5 end of the winding xa5; the a5 end of the winding xa5 is connected to one end of the secondary winding isolation switch QS12, the x5 end of the winding xa5 is connected to one end of the secondary winding isolation switch QS11 and the secondary winding isolation switch QS21, and the other end of the secondary winding isolation switch QS21 is connected to the a6 end of the winding xa6; the a6 end of the winding xa6 is connected to one end of the secondary winding isolation switch QS10, and the x6 end of the winding xa6 is connected to one end of the secondary winding isolation switch QS9. the other ends of the secondary winding isolating switch QS9, the secondary winding isolating switch QS11, the secondary winding isolating switch QS13, the secondary winding isolating switch QS15, the secondary winding isolating switch QS17, and the secondary winding isolating switch QS19 are all connected to an output line of the secondary main circuit, and the secondary winding isolating switch QS10, the secondary winding isolating switch QS12, the secondary winding isolating switch QS14, the secondary winding isolating switch QS16, the secondary winding isolating switch QS18, and the secondary winding isolating switch QS20 are all connected to another output line of the secondary main circuit.

[0014] Preferably, the secondary side winding isolating switch QS9, the secondary side winding isolating switch QS10, ..., the secondary side winding isolating switch QS25 are integrated into the valve island box VT2.

[0015] Preferably, the primary side isolating switch QS includes an isolating switch QS1 and an isolating switch QS2 installed on two different input lines, and the shunt isolating switch QS includes an isolating switch QS3 and an isolating switch QS4. The isolating switch QS1, the isolating switch QS2, the isolating switch QS3 and the isolating switch QS4 are integrated into the valve island box VT1, and the isolating switches in the valve island box VT1 are all connected to the PLC controller.

[0016] Preferably, the first isolating switch QS on the secondary side includes isolating switch QS7 and isolating switch QS8, and the second isolating switch QS on the secondary side includes isolating switch QS5 and isolating switch QS6. Isolating switch QS5, isolating switch QS6, isolating switch QS7 and isolating switch QS8 are integrated into the valve island box VT1, and the isolating switches in the valve island box VT1 are all connected to the PLC controller.

[0017] Preferably, the model of the PLC controller is S7-1500 produced by Siemens.

[0018] During use, the test specimen is connected to the test station. Based on the input voltage required for the dynamic thermal stability test, the PLC controller issues control commands to close and open the circuit breaker QF. Simultaneously, the disconnectors in the valve island boxes VT1 and VT2 are closed and opened, outputting appropriate secondary voltage values. The switching status of the disconnectors and circuit breakers is transmitted back to the PLC controller via a bus and displayed on the control computer. The Rogowski coil Rct and current transformer TA transmit the collected voltage and current signals to the control computer, which then measures the voltage and current on the primary and secondary sides of the short-circuit transformer.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The utility model changes the series and parallel relationship of the six windings on the secondary side of the short-circuit transformer through a PLC controller, and outputs six different secondary side output voltages of 1.5kV, 3kV, 4.5kV, 6kV, 7.5kV and 9kV, so that the short-circuit capacity of the single-phase voltage-regulating transformer system is increased, and the secondary side voltage combinations are multiple. The test main circuit and the transformer secondary side wiring can be connected in sequence with one button according to the test parameter requirements, which saves time and labor and greatly reduces the test cost.

[0021] In the utility model, multiple isolating switches are integrated into the valve island box, and the isolating switches, circuit breakers, phase selector switches and reactors are all remotely controlled to be opened and closed by a PLC controller, which has a high degree of automation and reduces safety hazards in the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a block diagram of the control system of the utility model;

[0023] Figure 2 It is the main circuit diagram of the utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 、 Figure 2 The high-voltage switchgear dynamic thermal stability test platform shown in the figure includes a short-circuit transformer TM. The primary side input end of the short-circuit transformer TM is connected to the primary side main circuit, the secondary side output end of the short-circuit transformer TM is connected to the secondary side main circuit, and the secondary side main circuit is connected to the test station ST. The primary side of the short-circuit transformer TM is provided with three primary windings connected in parallel with each other, the input voltage is 24.6kV, and the secondary side is provided with six secondary windings. The two ends of each secondary winding are respectively connected to a secondary winding isolating switch, and the two adjacent A secondary winding isolating switch is installed between the secondary windings. All secondary winding isolating switches are integrated into the valve island box VT2. The secondary winding isolating switches in the valve island box VT2 are connected to the PLC controller, and the PLC controller is connected to the control computer. The PLC controller controls the opening and closing of the secondary winding isolating switches to make the six secondary windings form different series or parallel circuits and output six different secondary output voltages of 1.5kV, 3kV, 4.5kV, 6kV, 7.5kV and 9kV.

[0026] The primary side main circuit includes two input lines connected to the high-voltage power supply. Each input line is equipped with a circuit breaker QF, a reactor L, a primary side disconnector QS and a current transformer TA connected in series in sequence. The two ends of the reactor L are connected in parallel with the shunt disconnector QS. On one of the lines, a phase selection switch MS is also connected in series between the circuit breaker QF and the reactor L.

[0027] The secondary side main circuit includes two output lines connected to the test station ST of the test product. Each output line is provided with a secondary side first isolating switch QS, a Rogowski coil Rct and a secondary side second isolating switch QS which are connected in series in sequence. The secondary side second isolating switch QS is grounded.

[0028] The secondary winding includes winding xa1, winding xa2, winding xa3, winding xa4, winding xa5 and winding xa6. The a1 end of winding xa1 is connected to one end of the secondary side isolation switch QS20, the x1 end of winding xa1 is connected to one end of the secondary side winding isolation switch QS19 and the secondary side winding isolation switch QS25, and the other end of the secondary side winding isolation switch QS25 is connected to the a2 end of winding xa2; the a2 end of winding xa2 is also connected to one end of the secondary side winding isolation switch QS18, and the x2 end of winding xa2 is connected to the secondary side winding isolation switch QS17 and the secondary side winding isolation switch QS25. One end of the switch QS24 is connected, and the other end of the secondary winding isolation switch QS24 is connected to the a3 end of the winding xa3; the a3 end of the winding xa3 is connected to one end of the secondary winding isolation switch QS16, the x3 end of the winding xa3 is connected to the secondary winding isolation switch QS15 and one end of the secondary winding isolation switch QS23, and the other end of the secondary winding isolation switch QS23 is connected to the a4 end of the winding xa4; the a4 end of the winding xa4 is connected to one end of the secondary winding isolation switch QS14, and the x4 end of the winding xa4 is connected to the secondary winding isolation switch QS13 and the secondary winding One end of the isolation switch QS22 is connected, and the other end of the secondary winding isolation switch QS22 is connected to the a5 end of the winding xa5; the a5 end of the winding xa5 is connected to one end of the secondary winding isolation switch QS12, the x5 end of the winding xa5 is connected to the secondary winding isolation switch QS11 and one end of the secondary winding isolation switch QS21, and the other end of the secondary winding isolation switch QS21 is connected to the a6 end of the winding xa6; the a6 end of the winding xa6 is connected to one end of the secondary winding isolation switch QS10, and the x6 end of the winding xa6 is connected to one end of the secondary winding isolation switch QS9 The other ends of the secondary winding isolating switch QS9, the secondary winding isolating switch QS11, the secondary winding isolating switch QS13, the secondary winding isolating switch QS15, the secondary winding isolating switch QS17, and the secondary winding isolating switch QS19 are all connected to an output line of the secondary main circuit, and the secondary winding isolating switch QS10, the secondary winding isolating switch QS12, the secondary winding isolating switch QS14, the secondary winding isolating switch QS16, the secondary winding isolating switch QS18, and the secondary winding isolating switch QS20 are all connected to another output line of the secondary main circuit.

[0029] The secondary side winding isolating switch QS9, the secondary side winding isolating switch QS10, ..., the secondary side winding isolating switch QS25 are integrated into the valve island box VT2.

[0030] The primary side isolating switch QS includes isolating switch QS1 and isolating switch QS2 installed on two different input lines. The shunt isolating switch QS includes isolating switch QS3 and isolating switch QS4. Isolating switch QS1, isolating switch QS2, isolating switch QS3 and isolating switch QS4 are integrated into the valve island box VT1. The isolating switches in the valve island box VT1 are all connected to the PLC controller.

[0031] The first isolating switch QS on the secondary side includes isolating switch QS7 and isolating switch QS8, and the second isolating switch QS on the secondary side includes isolating switch QS5 and isolating switch QS6. Isolating switch QS5, isolating switch QS6, isolating switch QS7 and isolating switch QS8 are integrated into the valve island box VT1, and the isolating switches in the valve island box VT1 are all connected to the PLC controller.

[0032] The model of the PLC controller is S7-1500 produced by Siemens.

[0033] During use, the test specimen is connected to the test station. Based on the input voltage required for the dynamic thermal stability test, the PLC controller issues control commands to close and open the circuit breaker QF. Simultaneously, the disconnectors in the valve island boxes VT1 and VT2 are closed and opened, outputting appropriate secondary voltage values. The switching status of the disconnectors and circuit breakers is transmitted back to the PLC controller via a bus and displayed on the control computer. The Rogowski coil Rct and current transformer TA transmit the collected voltage and current signals to the control computer, which then measures the voltage and current on the primary and secondary sides of the short-circuit transformer.

[0034] The six ways to connect the secondary winding to output different voltages include:

[0035] (1) All six windings on the secondary side are connected in series, and the secondary side output voltage is 9 kV. The wiring method is as follows: the secondary side winding isolating switch QS9, the secondary side winding isolating switch QS21, the secondary side winding isolating switch QS22, the secondary side winding isolating switch QS23, the secondary side winding isolating switch QS24, the secondary side winding isolating switch QS25, and the secondary side winding isolating switch QS20 are closed, and the remaining secondary side winding isolating switches are open;

[0036] (2) All six windings on the secondary side are connected in parallel, and the secondary side output voltage is 1.5 kV. The wiring method is as follows: the secondary side winding isolating switch QS21, the secondary side winding isolating switch QS22, the secondary side winding isolating switch QS23, the secondary side winding isolating switch QS24, and the secondary side winding isolating switch QS25 are open, and the remaining secondary side winding isolating switches are closed;

[0037] (3) The secondary side 6 windings are connected in series after every 3 windings and then in parallel. The secondary side output voltage is 4.5kV. The wiring method is: the secondary side winding isolating switch QS9, the secondary side winding isolating switch QS21, the secondary side winding isolating switch QS22, the secondary side winding isolating switch QS14, the secondary side winding isolating switch QS15, the secondary side winding isolating switch QS25, the secondary side winding isolating switch QS24, and the secondary side winding isolating switch QS20 are closed, and the other secondary side winding isolating switches are opened;

[0038] (4) Every two windings of the 6 secondary windings are connected in series and then in parallel. The secondary output voltage is 3kV. The wiring method is as follows: the secondary winding isolating switch QS9, the secondary winding isolating switch QS21, the secondary winding isolating switch QS12, the secondary winding isolating switch QS13, the secondary winding isolating switch QS23, the secondary winding isolating switch QS16, the secondary winding isolating switch QS25, and the secondary winding isolating switch QS20 are closed, and the remaining secondary winding isolating switches are open;

[0039] (5) Four of the six windings on the secondary side are connected in series, and the secondary side output voltage is 6 kV. The wiring method is: the secondary side winding isolating switch QS9, the secondary side winding isolating switch QS21, the secondary side winding isolating switch QS22, the secondary side winding isolating switch QS23, and the secondary side winding isolating switch QS16 are closed, and the remaining secondary side winding isolating switches are open;

[0040] (6) Five of the six windings on the secondary side are connected in series, and the secondary side output voltage is 7.5 kV. The wiring method is: the secondary side winding isolating switch QS9, the secondary side winding isolating switch QS21, the secondary side winding isolating switch QS22, the secondary side winding isolating switch QS23, the secondary side winding isolating switch QS24, the secondary side winding isolating switch QS25, and the secondary side winding isolating switch QS19 are closed, and the remaining secondary side winding isolating switches are open.

[0041] The utility model changes the series and parallel relationship of the six windings on the secondary side of the short-circuit transformer through a PLC controller, and outputs six different secondary side output voltages of 1.5kV, 3kV, 4.5kV, 6kV, 7.5kV and 9kV. The short-circuit capacity of the single-phase voltage-regulating transformer system is increased, and there are many secondary side voltage combinations. The test main circuit and the transformer secondary side wiring can be connected in sequence with one button according to the test parameter requirements, which saves time and effort and greatly reduces the test cost.

[0042] The above are only preferred embodiments of the present invention. It should be noted that those skilled in the art can make other equivalent variations and improvements based on the technical enlightenment provided by the present invention, which should also be considered as the scope of protection of the present invention.

Claims

1. A dynamic thermal stability test platform for high-voltage switchgear, comprising a short-circuit transformer TM, wherein the primary input terminal of the short-circuit transformer TM is connected to the primary main circuit, the secondary output terminal of the short-circuit transformer TM is connected to the secondary main circuit, and the secondary main circuit is connected to a test station ST, characterized in that: The primary side of the short-circuit transformer TM is provided with three primary windings connected in parallel with an input voltage of 24.6kV, and the secondary side is provided with six secondary windings. The two ends of each secondary winding are respectively connected to a secondary winding isolating switch, and a secondary winding isolating switch is installed between two adjacent secondary windings. All secondary winding isolating switches are integrated into the valve island box VT2. The secondary winding isolating switches in the valve island box VT2 are connected to the PLC controller, and the PLC controller is connected to the control computer; the PLC controller controls the opening and closing of the secondary winding isolating switches to make the six secondary windings form different series or parallel circuits, outputting six different secondary output voltages of 1.5kV, 3kV, 4.5kV, 6kV, 7.5kV and 9kV.

2. The test platform according to claim 1, characterized in that: The primary side main circuit includes two input lines connected to the high-voltage power supply. Each input line is provided with a circuit breaker QF, a reactor L, a primary side disconnector QS and a current transformer TA connected in series in sequence. The two ends of the reactor L are connected in parallel with the shunt disconnector QS. On one of the lines, a phase selection switch MS is also connected in series between the circuit breaker QF and the reactor L.

3. The test platform according to claim 1, characterized in that: The secondary side main circuit includes two output lines connected to the sample test station ST, each output line is provided with a secondary side first isolating switch QS, a Rogowski coil Rct and a secondary side second isolating switch QS connected in series in sequence, and the secondary side second isolating switch QS is grounded.

4. The test platform according to claim 1, 2 or 3, characterized in that: The secondary winding includes winding xa1, winding xa2, winding xa3, winding xa4, winding xa5 and winding xa6, the a1 end of winding xa1 is connected to one end of the secondary side isolation switch QS20, the x1 end of winding xa1 is connected to one end of the secondary side winding isolation switch QS19 and the secondary side winding isolation switch QS25, and the other end of the secondary side winding isolation switch QS25 is connected to the a2 end of winding xa2; the a2 end of winding xa2 is also connected to one end of the secondary side winding isolation switch QS18, and the x2 end of winding xa2 is connected to the secondary side winding isolation switch QS17 and the secondary side winding isolation switch QS25. One end of the isolating switch QS24 is connected to the secondary winding isolating switch QS24, and the other end of the secondary winding isolating switch QS24 is connected to the a3 end of the winding xa3; the a3 end of the winding xa3 is connected to one end of the secondary winding isolating switch QS16, the x3 end of the winding xa3 is connected to the secondary winding isolating switch QS15 and one end of the secondary winding isolating switch QS23, and the other end of the secondary winding isolating switch QS23 is connected to the a4 end of the winding xa4; the a4 end of the winding xa4 is connected to one end of the secondary winding isolating switch QS14, and the x4 end of the winding xa4 is connected to the secondary winding isolating switch QS13 and one end of the secondary winding One end of the secondary winding isolation switch QS22 is connected to the a5 end of the winding xa5; the a5 end of the winding xa5 is connected to one end of the secondary winding isolation switch QS12, the x5 end of the winding xa5 is connected to one end of the secondary winding isolation switch QS11 and the secondary winding isolation switch QS21, and the other end of the secondary winding isolation switch QS21 is connected to the a6 end of the winding xa6; the a6 end of the winding xa6 is connected to one end of the secondary winding isolation switch QS10, and the x6 end of the winding xa6 is connected to one end of the secondary winding isolation switch QS9. Connection: The other ends of the secondary winding isolation switch QS9, the secondary winding isolation switch QS11, the secondary winding isolation switch QS13, the secondary winding isolation switch QS15, the secondary winding isolation switch QS17, and the secondary winding isolation switch QS19 are all connected to an output line of the secondary side main circuit, and the secondary winding isolation switch QS10, the secondary winding isolation switch QS12, the secondary winding isolation switch QS14, the secondary winding isolation switch QS16, the secondary winding isolation switch QS18, and the secondary winding isolation switch QS20 are all connected to another output line of the secondary side main circuit.

5. The test platform according to claim 4, characterized in that: The secondary side winding isolating switch QS9, the secondary side winding isolating switch QS10, ..., the secondary side winding isolating switch QS25 are integrated into the valve island box VT2.

6. The test platform according to claim 2, characterized in that: The primary side isolating switch QS includes isolating switch QS1 and isolating switch QS2 installed on two different input lines, and the shunt isolating switch QS includes isolating switch QS3 and isolating switch QS4. Isolating switch QS1, isolating switch QS2, isolating switch QS3 and isolating switch QS4 are integrated into the valve island box VT1, and the isolating switches in the valve island box VT1 are all connected to the PLC controller.

7. The test platform according to claim 3, characterized in that: The first isolating switch QS on the secondary side includes isolating switch QS7 and isolating switch QS8, and the second isolating switch QS on the secondary side includes isolating switch QS5 and isolating switch QS6. Isolating switch QS5, isolating switch QS6, isolating switch QS7 and isolating switch QS8 are integrated into the valve island box VT1, and the isolating switches in the valve island box VT1 are all connected to the PLC controller.

8. The test platform according to claim 1, characterized in that: The model of the PLC controller is S7-1500 produced by Siemens.

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