System and method for detecting on-off performance of direct-current switch

Abstract

The invention discloses a system for detecting the on-off performance of a direct-current switch, which comprises a pulse power supply device, a switch device and a voltage and current detection device, and is characterized in that the pulse power supply device and the voltage and current detection device are electrically connected with the switch device; the pulse power supply device is provided with a pulse voltage module and a pulse current module and is a single pulse; the pulse voltage module is executed immediately after the pulse current module ends, and the voltage and current detection device records the voltage and current of the direct current switch to be detected in real time so as to obtain voltage and current change diagrams used for analyzing the breaking performance; the invention also provides a detection method. According to the invention, pulse discharge is adopted and voltage and current changes are detected in real time to obtain voltage and current change diagrams, a pulse current module and a pulse voltage module of a pulse power supply device are used for discharging in sequence, and a voltage and current detection device is used for detecting the whole test process in real time to obtain the voltage and current change diagrams; therefore, the on-off performance of the direct-current switch is accurately analyzed.

Description

Technical Field

[0001] The present invention relates to the technical field of switchgear testing, and particularly relates to a system and a detection method for detecting the opening and closing performance of a DC switch. Background Art

[0002] A DC switch is a commonly used protection device in an electrical circuit. The opening and closing performance of the DC switch is one of the important factors determining its safety. Therefore, it is necessary to detect the DC switch after production.

[0003] Currently, the commonly used system for detecting the opening and closing performance of a DC switch usually adopts a method of controlling the timing of capacitor charging and discharging, that is, according to the parameters of the DC switch to be tested, charging the capacitor in advance, and then detecting by controlling the line opening time difference between the capacitor and the DC switch to be tested, and judging the opening and closing performance by recording the voltage and current. Although this method can complete the detection of the opening and closing performance of the DC switch, due to the use of capacitor charging and discharging and switch timing control, the electric energy for charging the capacitor is usually much larger than the electric energy required for testing, resulting in a large amount of residual electric energy in the capacitor after the work is completed. Therefore, it is necessary to discharge the capacitor in time to protect the safety of the circuit after the test, thus wasting a lot of electric energy, and the capacitor cannot be replenished during the discharging process, and its discharging parameters are fluctuating, so it is difficult to accurately judge the opening and closing performance of the DC switch.

[0004] Therefore, for the existing system for detecting the opening and closing performance of a DC switch by adopting the method of controlling the timing of capacitor charging and discharging, due to the need for redundant configuration of the capacitor and the fluctuation of the capacitor during the discharging process, the test energy consumption is high and the accuracy of judging the opening and closing performance is insufficient. Summary of the Invention

[0005] The purpose of the present invention is to provide a system and a detection method for detecting the opening and closing performance of a DC switch, so as to solve the technical problems in the prior art that due to the need for redundant configuration of the capacitor and the fluctuation of the capacitor during the discharging process when adopting the method of controlling the timing of capacitor charging and discharging, the test energy consumption is high and the accuracy of judging the opening and closing performance is insufficient.

[0006] To solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A system for detecting the opening and closing performance of a DC switch includes a pulse power supply device, a switch device, and a voltage and current detection device. The pulse power supply device and the voltage and current detection device are both electrically connected to the switch device, and the switch device is used to install and connect the DC switch to be tested;

[0008] The pulse power supply device has a pulse voltage module and a pulse current module. The pulse voltage module and the pulse current module both set the pulse value and pulse time according to the parameter values of the DC switch to be tested, and both the pulse voltage module and the pulse current module are set to single pulses;

[0009] Among them, the pulse voltage module is executed immediately after the pulse current module ends. The voltage and current detection device records the voltage and current of the DC switch to be measured in real time, so as to obtain the voltage and current change diagrams for analyzing the opening and breaking performance.

[0010] As a preferred solution of the present invention, the parameter values of the DC switch to be measured include the maximum short-circuit current value, the maximum operating voltage value, and the opening response time constant;

[0011] Among them, the pulse value of the pulse current module is the maximum short-circuit current value, and the pulse time of the pulse current module is the opening response time constant;

[0012] The pulse value of the pulse voltage module is the maximum operating voltage value, and the pulse time of the pulse voltage module is a custom fixed value.

[0013] As a preferred solution of the present invention, the voltage and current change diagrams include the voltage mutation time, the current mutation time, and the number of current mutations. The voltage mutation time indicates the end of the work of the pulse current module and the start of the work of the pulse voltage module, and the current mutation time indicates the on-off state of the DC switch to be measured;

[0014] Among them, the opening and breaking performance of the DC switch to be measured is judged according to the current mutation time and the number of current mutations.

[0015] As a preferred solution of the present invention, the voltage and current detection device is electrically connected to the pulse power supply device to form a control circuit;

[0016] Among them, during the pulse discharge process of the pulse power supply device, when the voltage and current detection device detects that the current of the DC switch to be measured suddenly becomes zero, it immediately controls the pulse power supply device through the control circuit, so that the pulse power supply device cuts off the output in time and immediately switches from the pulse current module to the pulse voltage module output.

[0017] As a preferred solution of the present invention, the voltage and current detection device includes a voltage acquisition module, a current acquisition module, and a central control module. The voltage acquisition module and the current acquisition module are both electrically connected to the central control module to process the acquired voltage and current data;

[0018] Among them, the voltage acquisition module is connected in parallel with the switch device to be connected in parallel with the DC switch to be measured, and the current acquisition module is connected in series with the switch device to be connected in series with the DC switch to be measured.

[0019] As a preferred solution of the present invention, a protection switch is provided on the series circuit of the switch device and the current acquisition module;

[0020] Among them, the protection switch is electrically connected to the central control module, and the central control module controls the protection switch to automatically close when the pulse current module outputs, and to automatically close when the pulse voltage module outputs.

[0021] As a preferred solution of the present invention, the control circuit is formed by electrically connecting the central control module and the pulse power supply device;

[0022] Among them, after the current acquisition module detects that the current suddenly becomes zero and then resumes conduction, the central control module controls the protection switch to disconnect, and at the same time, controls the pulse power supply device to cut off the output of the pulse current module;

[0023] When the pulse voltage module is working and the current acquisition module detects that the current is not zero, the central control module controls the protection switch to disconnect, and at the same time, controls the pulse power supply device to cut off the output of the pulse voltage module.

[0024] As a preferred solution of the present invention, the switching device includes a test socket and a protection circuit. The test socket is used to connect the DC switch to be tested, and the protection circuit is respectively connected in parallel with the pulse voltage module and the pulse current module;

[0025] Among them, the protection switch is a double-gate switch. The protection circuit is connected in series with one side of the protection switch, and the other side of the protection switch is connected in series with the test socket. After the protection switch disconnects the test socket, the protection switch connects the protection circuit to the pulse voltage module, or the protection circuit to the pulse current module.

[0026] As a preferred solution of the present invention, the protection circuit is composed of a capacitive element, a resistive element, and an inductive element connected in series and parallel.

[0027] To solve the above technical problems, the present invention further provides the following technical solutions:

[0028] A detection method for a system using the above method for detecting the opening and closing performance of a DC switch includes the following steps:

[0029] Step 100: Based on the parameter values of the DC switch to be tested, set the pulse voltage value, pulse current value, pulse current time, and pulse voltage time of the pulse power supply device, and set the pulse current and pulse voltage to the single-shot mode, and the pulse voltage is executed after the pulse current ends;

[0030] Step 200: Install the DC switch to be tested on the switching device and start the test;

[0031] Step 300: The voltage and current detection device records the voltage and current of the DC switch to be tested in real time, obtains the voltage and current variation diagrams, and analyzes and judges the opening and closing performance of the DC switch to be tested based on the voltage and current variation diagrams.

[0032] The present invention has the following beneficial effects compared with the prior art:

[0033] The present invention adopts the method of pulse discharge and real-time detection of voltage and current changes to obtain voltage and current variation diagrams. The pulse current module and pulse voltage module of the pulse power supply device discharge in sequence, and the voltage and current detection device detects the entire test process in real time to obtain the voltage and current variation diagrams, and accurately analyzes the opening and closing performance of the DC switch based on this. Description of the Drawings

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0035] Figure 1 It is a schematic structural composition diagram of the system for detecting the opening and closing performance of the DC switch provided by the embodiment of the present invention;

[0036] Figure 2 It is a schematic connection diagram of the protection switch of the system for detecting the opening and closing performance of the DC switch provided by the embodiment of the present invention;

[0037] Figure 3 It is a schematic diagram of voltage and current changes of the system for detecting the opening and closing performance of the DC switch provided by the embodiment of the present invention.

[0038] The reference numerals in the drawings are respectively represented as follows:

[0039] 1 - Pulse power supply device; 2 - Switch device; 3 - Voltage and current detection device;

[0040] 11 - Pulse voltage module; 12 - Pulse current module; 21 - Test socket; 22 - Protection circuit; 31 - Voltage acquisition module; 32 - Current acquisition module; 33 - Central control module; 34 - Protection switch. Detailed Embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] As Figure 1 , Figure 2 shown, the present invention provides a system for detecting the opening performance of a DC switch, including a pulse power supply device 1, a switch device 2, and a voltage and current detection device 3. The pulse power supply device 1 and the voltage and current detection device 3 are both electrically connected to the switch device 2, and the switch device 2 is used for installing and connecting the DC switch to be tested.

[0043] The pulse power supply device 1 has a pulse voltage module 11 and a pulse current module 12. The pulse voltage module 11 and the pulse current module 12 both set the pulse value and pulse time according to the parameter values of the DC switch to be tested, and both the pulse voltage module 11 and the pulse current module 12 are set to single pulses.

[0044] Among them, the pulse voltage module 11 is executed immediately after the pulse current module 12 ends. The voltage and current detection device 3 records the voltage and current of the DC switch to be tested in real time to obtain a voltage and current change diagram for analyzing the opening performance.

[0045] The system for detecting the opening performance of the DC switch in this embodiment mainly connects the pulse power supply device 1 to the switch device 2, and the voltage and current detection device 3 is connected to the switch device 2 to detect the voltage and power of the DC switch to be tested in real time. The pulse current module 12 of the pulse power supply device 1 releases a current that matches the parameter values of the DC switch to be tested once, and after the pulse current module 12 finishes working, the pulse voltage module 11 automatically releases a voltage that matches the parameter values of the DC switch to be tested to detect the dielectric strength recovery ability of the DC switch after opening.

[0046] During this process, the voltage and current detection device 3 is used to obtain the voltage and current change diagram after the single operation of the pulse current module 12 and the pulse voltage module 11. The opening performance of the DC switch to be tested can be intuitively analyzed through the voltage and current change diagram.

[0047] Compared with the existing method of controlling the timing of capacitor charging and discharging, the system for detecting the opening and closing performance of a DC switch in this embodiment uses the method of pulsed discharge and real-time monitoring to obtain voltage and current change diagrams. By setting the pulsed power supply device 1 to connect to the switch device 2 and discharge stably to it according to the parameter values of the DC switch to be measured, the discharge fluctuation can be avoided. During this process, the voltage and current of the DC switch to be measured are detected in real time by the voltage and current detection device 3, and the voltage and current change diagrams are obtained, so as to quickly analyze the opening and closing performance of the DC switch to be measured according to the voltage and current change diagrams. Moreover, pulsed discharge can achieve one measurement and one discharge, effectively reducing energy consumption.

[0048] Among them, the parameter values of the DC switch to be measured include the maximum short-circuit current value, the maximum operating voltage value, and the opening response time constant;

[0049] The pulse value of the pulse current module 12 is the maximum short-circuit current value, and the pulse time of the pulse current module 12 is the opening response time constant;

[0050] The pulse value of the pulse voltage module 11 is the maximum operating voltage value, and the pulse time of the pulse voltage module 11 is a custom fixed value.

[0051] Using the maximum short-circuit current value as the pulse value of the pulse current module 12 can detect whether breakdown and reconnection occur after opening, and using the maximum operating voltage value as the pulse value of the pulse voltage module 11 can detect the dielectric strength recovery ability after opening, so as to evaluate the performance of the DC switch to be measured.

[0052] Such as Figure 3 As shown, the voltage and current change diagrams include the voltage mutation time, the current mutation time, and the number of current mutations. The voltage mutation time indicates the end of the work of the pulse current module 12 and the start of the work of the pulse voltage module 11, and the current mutation time indicates the on-off state of the DC switch to be measured;

[0053] Among them, the opening and closing performance of the DC switch to be measured is judged according to the current mutation time and the number of current mutations.

[0054] Specifically, when the DC switch to be measured completes opening within the pulse time of the pulse current module 12 (such as Figure 3 the 0-t3 section of a, 3b, 3c), the current value will drop to 0. If breakdown occurs at this time, a reconnection phenomenon will occur, and the current value will be detected again (that is, Figure 3 the t2-t3 section of a);

[0055] And when the DC switch to be measured completes opening within the pulse time of the pulse current module 12 and within the pulse time of the pulse voltage module 11 (such as Figure 3a, during the t3 - t4 period of 3b and 3c) if the opening is maintained, the current value is 0, and the voltage value maintains the maximum working voltage. If the medium has not recovered or breaks down again at this time, a re - conduction phenomenon will occur, and the current value will be detected again (i.e., Figure 3 the t3 - t4 period of b);

[0056] Therefore, when the detected voltage - current change diagram of the DC switch to be measured is as Figure 3 c, it indicates that the opening performance of the DC switch to be measured is good.

[0057] Based on the above - mentioned implementation manner, during the discharge test of the pulse current module 12, the DC switch to be measured may complete the opening in advance within the pulse time. At this time, the pulse current module 12 continues to discharge, which is likely to affect the circuit and is also insufficient in terms of safety. Based on this, the following preferred embodiments are provided.

[0058] As Figure 1 shown, the voltage - current detection device 3 is electrically connected to the pulse power supply device 1 to form a control circuit;

[0059] Among them, during the pulse discharge process of the pulse power supply device 1, when the voltage - current detection device 3 detects that the current of the DC switch to be measured suddenly becomes zero, it immediately controls the pulse power supply device 1 through the control circuit, so that the pulse power supply device 1 cuts off the output in time and immediately switches from the pulse current module 12 to the pulse voltage module 11 for output.

[0060] Specifically, a control circuit is formed between the voltage - current detection device 3 and the pulse power supply device 1, that is, the voltage - current detection device 3 can control the pulse power supply device 1 according to the real - time detection results;

[0061] Based on this, during the discharge test of the pulse current module 12, when the DC switch to be measured completes the opening in advance within the pulse time, at this time the current value suddenly becomes 0, and the voltage - current detection device 3 timely controls the pulse power supply device 1 to turn off the discharge of the pulse current module 12 and switches to turn on the discharge of the pulse voltage module 11, thereby realizing automatic switching after the opening of the DC switch to be measured and protecting the circuit.

[0062] At the same time, the relationship between voltage, current and time in this detection process will be reflected in the voltage - current change diagram, so that a conclusion about the response speed of the DC switch to be measured due to the parameter values can be obtained, so as to improve the accuracy of the evaluation of the opening performance of the DC switch to be measured.

[0063] Of course, to obtain the voltage - current change diagram, it is necessary for the voltage - current detection device 3 to detect the voltage and current changes of the DC switch to be measured in real time. Based on this, the following preferred embodiments are provided.

[0064] As Figure 1As shown, the voltage and current detection device 3 includes a voltage acquisition module 31, a current acquisition module 32, and a central control module 33. The voltage acquisition module 31 and the current acquisition module 32 are both electrically connected to the central control module 33 to process the acquired voltage and current data;

[0065] Among them, the voltage acquisition module 31 is connected in parallel with the switch device 2 to be connected in parallel with the DC switch to be measured, and the current acquisition module 32 is connected in series with the switch device 2 to be connected in series with the DC switch to be measured.

[0066] Specifically, the voltage acquisition module 31 is used to acquire the voltage change of the DC switch to be measured, the current acquisition module 32 is used to acquire the current change of the DC switch to be measured, and the central control module 33 is used to receive the detected voltage and current and generate a voltage and current change diagram according to time processing, as well as control the start and stop of the pulse voltage module 11 and the pulse current module 12.

[0067] During the test, there is a risk that the DC switch to be measured may be broken down. If the broken-down DC switch to be measured is not powered off in time, safety accidents are likely to occur. Based on this, the following preferred embodiments are provided.

[0068] As Figure 2 shown, a protection switch 34 is provided on the series circuit of the switch device 2 and the current acquisition module 32;

[0069] Among them, the protection switch 34 is electrically connected to the central control module 33. The central control module 33 controls the protection switch 34 to automatically close when the pulse current module 12 outputs, and to automatically close when the pulse voltage module 11 outputs.

[0070] Specifically, the protection switch 34 can timely disconnect the DC switch to be measured. During the test, it can automatically close to form a loop, and when breakdown occurs, it can automatically disconnect according to the current value and the occurrence time. Specifically:

[0071] During the discharge test of the pulse current module 12, the DC switch to be measured may complete the opening in advance within the pulse time, the current value suddenly becomes 0, and within a very short time, the current value is detected again, which is breakdown and reconnection. At this time, the central control module 33 controls the protection switch 34 to disconnect in time for protection;

[0072] And when it switches to the discharge test of the pulse voltage module 11, the central control module 33 controls the protection switch 34 to close again, and after the current acquisition module 32 acquires the current value again, which is breakdown and reconnection again. At this time, the central control module 33 controls the protection switch 34 to disconnect in time for protection, improving the safety performance.

[0073] Of course, when the protection switch 34 is disconnected, the corresponding pulse voltage module 11 or pulse current module 12 also needs to stop working. Based on this, the following preferred embodiments are provided.

[0074] As Figure 2 shown, the control circuit is composed of a central control module 33 electrically connected to a pulse power supply device 1;

[0075] Among them, after the current acquisition module 32 detects that the current suddenly becomes zero and then resumes conduction, the central control module 33 controls the protection switch 34 to disconnect. At the same time, the control pulse power supply device 1 cuts off the output of the pulse current module 12;

[0076] When the pulse voltage module 11 is working and the current acquisition module 32 detects that the current is not zero, the central control module 33 controls the protection switch 34 to disconnect. At the same time, the control pulse power supply device 1 cuts off the output of the pulse voltage module 11.

[0077] Specifically, the control circuit enables the central control module 33 to control the start and stop of the pulse voltage module 11 and the pulse current module 12, so that while the protection switch 34 is disconnected, the pulse voltage module 11 or the pulse current module 12 can be cut off in time.

[0078] Of course, even if the pulse voltage module 11 and the pulse current module 12 are quickly cut off, part of the electrical energy released by the pulse voltage module 11 and the pulse current module 12 still remains in the circuit of the switching device. To improve safety, the following preferred embodiments are provided.

[0079] As Figure 2 shown, the switching device 2 includes a test socket 21 and a protection circuit 22. The test socket 21 is used to connect the DC switch to be tested, and the protection circuit 22 is respectively connected in parallel with the pulse voltage module 11 and the pulse current module 12;

[0080] Among them, the protection switch 34 is a double-gate switch. The protection circuit 22 is connected in series with one side of the protection switch 34, and the other side of the protection switch 34 is connected in series with the test socket 21. After the protection switch 34 disconnects the test socket 21, the protection switch 34 connects the protection circuit 22 to the pulse voltage module 11, or the protection circuit 22 to the pulse current module 12;

[0081] The protection circuit 22 is composed of a capacitive element, a resistive element, and an inductive element connected in series and parallel.

[0082] Specifically, when the protection switch 34 shuts off the test socket 21, it connects the pulse voltage module 11 and the pulse current module 12 in parallel with the protection circuit 22, thereby releasing the residual electrical energy in the circuit through the protection circuit 22, greatly improving the safety of the test.

[0083] Based on the above system for detecting the opening and closing performance of a DC switch, a detection method is provided, including the following steps:

[0084] Step 100: Based on the parameter values of the DC switch to be tested, set the pulse voltage value, pulse current value, pulse current time, and pulse voltage time of the pulse power supply device, and set the pulse current and pulse voltage to single-shot mode, and the pulse voltage is executed after the pulse current ends;

[0085] Step 200: Install the DC switch to be tested on the switch device and start the test;

[0086] Step 300: The voltage and current detection device records the voltage and current of the DC switch to be tested in real time, obtains the voltage and current change diagram, and analyzes and judges the opening and closing performance of the DC switch to be tested according to the voltage and current change diagram.

[0087] The detection method of the present invention first sets the pulse voltage value, pulse current value, pulse current time, and pulse voltage time of the test according to the parameter values of the DC switch to be tested, and sets it to a single pulse, and then installs the DC switch to be tested on the switch device, starts the test, the pulse current module and the pulse voltage module discharge in sequence, and the voltage and current detection device detects the voltage and current in real time during this process, so as to obtain the voltage and current change diagram. According to the voltage and current change diagram, the opening and closing performance of the DC switch to be tested can be intuitively obtained.

[0088] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. A system for detecting the opening and closing performance of a DC switch, characterized in that, It includes a pulse power supply device, a switching device, and a voltage and current detection device. The pulse power supply device and the voltage and current detection device are both electrically connected to the switching device, and the switching device is used to install and connect the DC switch to be tested. The pulse power supply device has a pulse voltage module and a pulse current module. The pulse voltage module and the pulse current module both set pulse values and pulse times according to the parameter values of the DC switch to be tested, and both the pulse voltage module and the pulse current module are set to single pulses. Among them, the pulse voltage module is executed immediately after the pulse current module ends. The voltage and current detection device records the voltage and current of the DC switch to be tested in real time to obtain a voltage and current change diagram for analyzing the opening performance.

2. A system for detecting the opening performance of a DC switch according to claim 1, wherein The parameter values of the DC switch to be tested include the maximum short-circuit current value, the maximum operating voltage value, and the opening response time constant. Among them, the pulse value of the pulse current module is the maximum short-circuit current value, and the pulse time of the pulse current module is the opening response time constant. The pulse value of the pulse voltage module is the maximum operating voltage value, and the pulse time of the pulse voltage module is a custom-defined value.

3. A system for detecting the opening performance of a DC switch according to claim 2, wherein The voltage and current change diagram includes the voltage mutation time, the current mutation time, and the number of current mutations. The voltage mutation time indicates the end of the operation of the pulse current module and the start of the operation of the pulse voltage module, and the current mutation time indicates the on-off state of the DC switch to be tested. Among them, the opening performance of the DC switch to be tested is judged according to the current mutation time and the number of current mutations.

4. A system for detecting the opening performance of a DC switch according to any one of claims 1-3, wherein The voltage and current detection device is electrically connected to the pulse power supply device to form a control circuit. Among them, during the pulse discharge process of the pulse power supply device, when the voltage and current detection device detects that the current of the DC switch to be tested suddenly becomes zero, it immediately controls the pulse power supply device through the control circuit to make the pulse power supply device cut off the output in time and immediately switch from the pulse current module to the pulse voltage module output.

5. A system for detecting the opening performance of a DC switch according to claim 4, wherein The voltage and current detection device includes a voltage acquisition module, a current acquisition module, and a central control module. The voltage acquisition module and the current acquisition module are both electrically connected to the central control module to process the acquired voltage and current data. Among them, the voltage acquisition module is connected in parallel with the switching device to be in parallel with the DC switch to be tested, and the current acquisition module is connected in series with the switching device to be in series with the DC switch to be tested.

6. A system for detecting the opening performance of a DC switch according to claim 5, wherein A protection switch is provided on the series circuit of the switching device and the current acquisition module. Wherein, the protection switch is electrically connected to the central control module, and the central control module controls the protection switch to automatically close when the pulse current module outputs, and to automatically close when the pulse voltage module outputs.

7. The system for detecting the opening and closing performance of a DC switch according to claim 6, wherein the control circuit is formed by electrically connecting the central control module and the pulse power supply device; Wherein, after the current acquisition module detects that the current suddenly becomes zero and then resumes conduction, the central control module controls the protection switch to disconnect, and at the same time, controls the pulse power supply device to cut off the output of the pulse current module; When the pulse voltage module is working and the current acquisition module detects that the current is not zero, the central control module controls the protection switch to disconnect, and at the same time, controls the pulse power supply device to cut off the output of the pulse voltage module.

8. The system for detecting the opening and closing performance of a DC switch according to claim 7, wherein the switch device includes a test socket and a protection circuit, the test socket is used to connect the DC switch to be tested, and the protection circuit is connected in parallel with the pulse voltage module and the pulse current module respectively; Wherein, the protection switch is a double-gate switch, one side of the protection switch is connected in series with the protection circuit, and the other side of the protection switch is connected in series with the test socket. After the protection switch disconnects the test socket, the protection switch connects the protection circuit to the pulse voltage module, or the protection circuit to the pulse current module.

9. The system for detecting the opening and closing performance of a DC switch according to claim 8, wherein the protection circuit is composed of a capacitive element, a resistive element and an inductive element connected in series and parallel.

10. A detection method for a system for detecting the opening performance of a DC switch according to any one of claims 1-9, characterized in that, It includes the following steps: Step 100: Based on the parameter values of the DC switch to be tested, set the pulse voltage value, pulse current value, pulse current time, and pulse voltage time of the pulse power supply device, and set the pulse current and pulse voltage to the single-shot mode, and the pulse voltage is executed after the pulse current ends; Step 200: Install the DC switch to be tested on the switch device and start the test; Step 300: The voltage and current detection device records the voltage and current of the DC switch to be tested in real time, obtains the voltage and current change diagram, and analyzes and judges the opening and closing performance of the DC switch to be tested according to the voltage and current change diagram.

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