Mechanical switch post-arc medium recovery characteristic test circuit and test method

Abstract

The invention discloses a mechanical switch post-arc medium recovery characteristic test circuit and test method. The circuit comprises a current source module, a commutation module, a voltage source module, a first trigger switch, a second trigger switch and a mechanical switch. A current signal is provided for the mechanical switch through the current source module, when the arcing current of the mechanical switch reaches a specified value, a reverse voltage is provided for the mechanical switch through the current conversion module, and after the arcing current on the mechanical switch is controlled to reach current zero crossing, the mechanical switch reaches a breakdown voltage by adjusting the magnitude of the output voltage of the voltage source module. Therefore, the purpose of post-arcing recovery feature detection of the mechanical switch is achieved. According to the embodiment of the invention, the voltage range provided for the mechanical switch can be enlarged, the charging value of the charger to the voltage source module is reduced, the operation flexibility and the adaptability are high, and the test voltage grade is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of flexible smart grid equipment, and particularly relates to a mechanical switch post-arc medium recovery characteristic test circuit and a test method. BACKGROUND

[0002] In a high-voltage direct-current transmission system, a direct-current circuit breaker is a key device for fast fault clearing and reliable isolation. One of the core components of the direct-current circuit breaker is a mechanical switch.

[0003] The mechanical switch needs to withstand high-strength stress in the breaking process of the direct-current circuit breaker, including fast current zero-crossing, large current arcing, fast transient recovery voltage, and the like, and therefore the post-arc medium recovery capability of the mechanical switch directly affects the reliable breaking of the direct-current circuit breaker. Therefore, research on the medium recovery characteristic of the mechanical switch after arc extinction is crucial to improve the reliability of the direct-current circuit breaker. SUMMARY

[0004] The mechanical switch post-arc medium recovery characteristic test circuit and the test method provided by the application embodiment can detect the recovery of the device characteristic of the mechanical switch after arcing, can amplify the pre-charge voltage through the voltage source module, can reduce the pre-charge voltage of the charging machine, can improve the test voltage level, and can meet the test requirements of the post-arc medium recovery of the high-voltage mechanical switch.

[0005] In a first aspect, the application embodiment provides a mechanical switch post-arc medium recovery characteristic test circuit, which comprises: a current source module, a commutation module, a voltage source module, a first trigger switch, a second trigger switch, and a mechanical switch; an output end of the current source module is electrically connected to one end of the first trigger switch and one end of the second trigger switch, an input end of the current source module, an input end of the commutation module, one end of the mechanical switch, and an input end of the voltage source module are connected to a ground end, the current source module is configured to provide a current signal to the mechanical switch to make the mechanical switch perform current arcing; the other end of the second trigger switch is electrically connected to an output end of the commutation module, the commutation module is configured to provide a first reverse voltage to the mechanical switch in the case that the current of the mechanical switch reaches a set arcing current, so as to make the mechanical switch perform current zero-crossing processing; the other end of the first trigger switch is electrically connected to the other end of the mechanical switch and an output end of the voltage source module, and the voltage source module is configured to provide a breakdown voltage to the mechanical switch after current zero-crossing.

[0006] In a possible implementation, the voltage source module comprises a switch unit, a first voltage unit, a second voltage unit and a first voltage source; a first end of the switch unit is electrically connected to the other end of the first trigger switch as an input end of the voltage source module; a second end of the switch unit is electrically connected to one end of the first voltage unit; a third end of the switch unit is electrically connected to a positive output end of the first voltage source; a fourth end of the switch unit is electrically connected to one end of the second voltage unit; the switch unit is configured to control the first voltage unit or the second voltage unit to be electrically connected to the mechanical switch; the other end of the first voltage unit, the other end of the second voltage unit and a negative input end of the first voltage source are connected to the ground end; the first voltage unit is configured to provide a second reverse voltage to the mechanical switch; the second voltage unit is configured to charge the first voltage unit; and the first voltage source is configured to charge the first voltage unit and the second voltage unit.

[0007] In a possible implementation, the switch unit comprises a third trigger switch, a fourth trigger switch, a first single-throw switch, a second single-throw switch and a first inductor; one end of the first inductor is electrically connected to the other end of the first trigger switch and one end of the fourth trigger switch; the other end of the first inductor is electrically connected to one end of the fourth trigger switch; the other end of the third trigger switch is electrically connected to one end of the first voltage unit and one end of the first single-throw switch; the other end of the fourth trigger switch is electrically connected to one end of the second voltage unit and one end of the second single-throw switch; the other end of the first single-throw switch is electrically connected to an output end of the first voltage source and the other end of the second single-throw switch.

[0008] In a possible implementation, the first voltage unit comprises a first capacitor, a second inductor, a first resistor, a third single-throw switch and a fifth trigger switch; one end of the first capacitor is electrically connected to the second end of the switch unit, one end of the second inductor and one end of the third single-throw switch; the other end of the first capacitor is electrically connected to one end of the first resistor and one end of the fifth trigger switch and the ground end; the other end of the fifth trigger switch is electrically connected to the other end of the second inductor; the other end of the third single-throw switch is electrically connected to the other end of the first resistor.

[0009] In a possible implementation, the second voltage unit comprises a second capacitor, a second resistor and a fourth single-throw switch; one end of the second capacitor is electrically connected to the fourth end of the switch unit and one end of the fourth single-throw switch; the other end of the second capacitor is electrically connected to one end of the second resistor and the ground end; the other end of the second resistor is electrically connected to the other end of the fourth single-throw switch.

[0010] In a possible implementation, the voltage source module further comprises a third resistor and a fourth resistor; one end of the third resistor is electrically connected with one end of the fourth resistor and the other end of the first trigger switch, and the other end of the third resistor is electrically connected with the first end of the switch unit; the other end of the fourth resistor is electrically connected with the ground end.

[0011] In a possible implementation, the current source module comprises a second voltage source, a fifth single-throw switch, a third inductor, a third capacitor, a sixth single-throw switch and a fifth resistor; the positive output end of the second voltage source is electrically connected with one end of the fifth single-throw switch, and the negative input end of the second voltage source is electrically connected with one end of the third capacitor, one end of the fifth resistor and the ground end; the other end of the fifth single-throw switch is electrically connected with one end of the third inductor, the other end of the third capacitor and one end of the sixth single-throw switch; the other end of the third inductor is electrically connected with one end of the first trigger switch and one end of the second trigger switch; the other end of the sixth single-throw switch is electrically connected with the other end of the fifth resistor.

[0012] In a possible implementation, the current source module comprises a second voltage source, a fifth single-throw switch, a third inductor, a third capacitor, a sixth single-throw switch and a fifth resistor; the positive output end of the second voltage source is electrically connected with one end of the fifth single-throw switch, and the negative input end of the second voltage source is electrically connected with one end of the third capacitor, one end of the fifth resistor and the ground end; the other end of the fifth single-throw switch is electrically connected with one end of the third inductor, the other end of the third capacitor and one end of the sixth single-throw switch; the other end of the third inductor is electrically connected with one end of the first trigger switch and one end of the second trigger switch; the other end of the sixth single-throw switch is electrically connected with the other end of the fifth resistor.

[0013] In a possible implementation, the current source module further comprises a lightning arrester; one end of the lightning arrester is electrically connected with the other end of the fourth inductor, and the other end of the lightning arrester is electrically connected with the ground end.

[0014] In a second aspect, the embodiments of the present application provide a mechanical switch post-arc medium recovery characteristic test method, which is applied to the mechanical switch post-arc medium recovery characteristic test circuit of any one of the first aspect, and comprises the following steps: controlling a first trigger switch to be turned on and a second trigger switch to be turned off, and determining an arc current provided by a current source module to the mechanical switch; controlling the first trigger switch and the second trigger switch to be turned on, and performing zero-crossing processing on the arc current by using a reverse voltage provided by a commutation module to the mechanical switch; and in the case that the arc current is zero, providing a voltage signal to the mechanical switch by using a voltage source module, so that the mechanical switch reaches a breakdown voltage and voltage recovery detection is performed on the breakdown voltage.

[0015] In a third aspect, the embodiments of the present application provide a mechanical switch post-arc medium recovery characteristic test device, which comprises a processor and a memory storing computer program instructions; and the processor implements the mechanical switch post-arc medium recovery characteristic test method of the second aspect when executing the computer program instructions.

[0016] The mechanical switch post-arc medium recovery characteristic test circuit, test method and device provided by the embodiments of the present application can set three test stages, first, the current source module is connected with the mechanical switch to provide a current signal to the mechanical switch, and at the same time, the size of the current output by the current source module is adjusted to control the size of the arc current of the mechanical switch; when the arc current of the mechanical switch reaches a specified value, the mechanical switch is connected with the commutation module, the commutation module provides a reverse voltage to the mechanical switch, and then the arc current on the mechanical switch is controlled to weaken; after the current is zero, the connection between the mechanical switch and the current source module and the commutation module is ended; at this time, the voltage source module is used to provide voltage to the mechanical switch again, the size of the voltage output by the voltage source module is adjusted, so that the mechanical switch reaches a breakdown voltage, thereby achieving the purpose of detecting the post-arc recovery characteristic of the mechanical switch. Different from the conventional test process, by adjusting the internal structure of the voltage source module, the present application can increase the voltage range provided to the mechanical switch, thereby reducing the charging value of the charger to the voltage source module, and has high operation flexibility and strong adaptability, and improves the test voltage level. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. For those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 FIG. 1 is a structural schematic diagram of a mechanical switch post-arc medium recovery characteristic test circuit provided by the embodiments of the present application;

[0019] Figure 2is a structural schematic diagram of another mechanical switch arc-after medium recovery characteristic test circuit provided by an embodiment of the present application;

[0020] Figure 3 is a structural schematic diagram of still another mechanical switch arc-after medium recovery characteristic test circuit provided by an embodiment of the present application;

[0021] Figure 4 is a structural schematic diagram of still another mechanical switch arc-after medium recovery characteristic test circuit provided by an embodiment of the present application;

[0022] Figure 5 is a structural schematic diagram of still another mechanical switch arc-after medium recovery characteristic test circuit provided by an embodiment of the present application;

[0023] Figure 6 is a waveform diagram of a mechanical switch arc-after medium recovery characteristic test circuit provided by an embodiment of the present application;

[0024] Figure 7 is a flowchart of a mechanical switch arc-after medium recovery characteristic test method provided by an embodiment of the present application;

[0025] Figure 8 is a structural schematic diagram of a mechanical switch arc-after medium recovery characteristic test device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the present application will be described in detail below, in order to make the purposes, technical solutions and advantages of the present application clearer and more apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. The present application can be implemented without some of these specific details by those skilled in the art. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0027] It is to be noted that the relative terms such as first and second and the like in this context are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0028] For the current mechanical switch characteristic detection means in the DC circuit breaker, a current source and a commutation signal are generally used to provide a forward operating current and a reverse current for the mechanical switch, and a reverse voltage is used to detect the current zero after the mechanical switch is turned on in the case of generating a discharge arc. The voltage at both ends of the mechanical switch is directly applied by a high-voltage device to make the mechanical switch break down, and the voltage at both ends of the mechanical switch is detected as an operation of detecting the post-arc medium characteristic recovery of the mechanical switch in the case of breakdown.

[0029] According to the above-mentioned characteristic detection means of the DC circuit breaker in the prior art, it can be known that there is an error in the post-arc medium characteristic detection of the mechanical switch when the voltage at both ends of the mechanical switch is loaded. The means for measuring the post-arc medium recovery characteristic of the mechanical switch by directly supplying power by using a power supply and directly providing a breakdown voltage for the mechanical switch by using an external voltage has different effects on the characteristic detection of the mechanical switch due to the different sizes of the applied breakdown voltage, which brings errors to the experimental results and affects the use of the DC circuit breaker.

[0030] In order to solve the problems in the prior art, the embodiment of the present application provides a mechanical switch post-arc medium recovery characteristic test circuit, a test method and equipment. By increasing a voltage source module, a reverse voltage is obtained by commutation in the process of simulating the path of the mechanical switch and arcing, so that the mechanical switch current zero is obtained. The voltage source module is used to provide an adjustable high-voltage signal for the mechanical switch, the voltage of the mechanical switch is detected in the environment of ensuring the breakdown of the mechanical switch, the post-arc medium recovery characteristic detection of the mechanical switch is realized, the operation flexibility is high, the adaptability is strong, the pre-charge voltage of the charging machine can be reduced, and the test voltage level is improved.

[0031] First, the structure of the mechanical switch post-arc medium recovery characteristic test circuit provided by the embodiment of the present application will be introduced.

[0032] Figure 1is a structural schematic diagram of a mechanical switch arc-after medium recovery characteristic test circuit provided by an embodiment of the present application. As shown in Figure 1 The structure of the mechanical switch arc-after medium recovery characteristic test circuit includes:

[0033] a current source module 10, a commutation module 20, a voltage source module 30, a first trigger switch TVS1, a second trigger switch TVS2, and a mechanical switch W.

[0034] The output end of the current source module 10 is electrically connected to one end of the first trigger switch TVS1 and one end of the second trigger switch TVS2, the input end of the current source module 10, the input end of the commutation module 20, one end of the mechanical switch W, and the input end of the voltage source module 30 are connected to a ground end, and the current source module 10 is configured to provide a current signal to the mechanical switch W to make the mechanical switch W perform current arc.

[0035] The other end of the second trigger switch TVS1 is electrically connected to the output end of the commutation module 20, and the commutation module 20 is configured to provide a first reverse voltage to the mechanical switch W when the current of the mechanical switch W reaches a set arc current, so as to make the mechanical switch W perform current zero-crossing processing.

[0036] The other end of the first trigger switch TVS1 is electrically connected to the other end of the mechanical switch W and the output end of the voltage source module 30, and the voltage source module 30 is configured to provide a breakdown voltage to the mechanical switch W after current zero-crossing.

[0037] The first trigger switch and the second trigger switch mentioned here are both set switches, which have the function of automatically turning off when the current is zero.

[0038] According to Figure 1The provided diagram first closes the first trigger switch TVS1, so that the current source module and the mechanical switch form a loop, the current source module provides a current signal for the mechanical switch, the mechanical switch generates a discharge arc under the action of the current signal, and different currents are provided for the mechanical switch through the current source module according to different specifications of the mechanical switch. When the current provided by the current source module reaches a preset value, the second trigger switch TVS2 is closed to access the commutation module, and the commutation module, the first trigger switch and the second trigger switch and the mechanical switch form a loop, the commutation module is set in advance to provide a first reverse voltage to the mechanical switch, and the conduction current and the arc current (i.e. the discharge arc) of the mechanical switch are weakened under the action of the first reverse voltage, until the arc current between the two ends of the mechanical switch is zero, and the first trigger switch and the second trigger switch are automatically disconnected according to the characteristics of the first trigger switch and the second trigger switch, and the current source module and the commutation module continue to provide current and reverse voltage for the mechanical switch. At this time, the control voltage source module is connected to the mechanical switch, the voltage source module continuously provides a voltage signal for the mechanical switch, the output voltage of the voltage source module is continuously increased by adjusting, and after the mechanical switch is broken down under the action of the output voltage, the voltage between the two ends of the mechanical switch is detected to realize the detection of the dielectric characteristic recovery after the arc of the mechanical switch. Compared with the prior art, the detection data obtained by the detection method of the present application is more accurate, the range of adjustable voltage can be controlled, and a detection circuit with higher flexibility is obtained. Due to the operation of arc extinction and voltage application after arc of the mechanical switch, the pre-charging voltage of the charging machine can be reduced, and the test voltage level can be improved.

[0039] The embodiment of the present application provides a mechanical switch arc after dielectric recovery characteristic test circuit, by increasing the voltage source module, when the mechanical switch arc reaches the current zero, the breakdown state is reached by the way of voltage increase, and then the dielectric characteristic recovery process after the mechanical switch arc can be accurately detected, and a detection circuit with higher flexibility is obtained. Due to the operation of arc extinction and voltage application after arc of the mechanical switch, the pre-charging voltage of the charging machine can be reduced, and the test voltage level can be improved.

[0040] In order to further explain the internal structure of the mechanical switch arc after dielectric recovery characteristic test circuit, Figure 2 is another structure diagram of the mechanical switch arc after dielectric recovery characteristic test circuit provided by the embodiment of the present application. Figure 2 is introduced on the basis of the above embodiment. According to Figure 2 The structure of the mechanical switch arc after dielectric recovery characteristic test circuit includes:

[0041] The current source module 10, the commutation module 20, the voltage source module 30, the first trigger switch TVS1, the second trigger switch TVS2 and the mechanical switch W.

[0042] According to Figure 2 The voltage source module 30 includes a switch unit 310, a first voltage unit 320, a second voltage unit 330 and a first voltage source U1 according to the provided diagram.

[0043] The first end of the switch unit 310 is electrically connected with the other end of the first trigger switch TVS1 as the input end of the voltage source module 30, the second end of the switch unit 310 is electrically connected with one end of the first voltage unit 320, the third end of the switch unit 310 is electrically connected with the positive output end of the first voltage source U1, the fourth end of the switch unit 310 is electrically connected with one end of the second voltage unit 330, and the switch unit 310 is used to control the electrical connection between the first voltage unit 320 or the second voltage unit 330 and the mechanical switch W.

[0044] The other end of the first voltage unit 320, the other end of the second voltage unit 330 and the negative input end of the first voltage source U1 are connected to the ground end, the first voltage unit 320 is used to provide the second reverse voltage to the mechanical switch W, the second voltage unit 330 is used to charge the first voltage unit 320, and the first voltage source U1 is used to charge the first voltage unit 320 and the second voltage unit 330.

[0045] According to Figure 2 According to the provided diagram, before detecting the mechanical switch characteristics, the first voltage source U1 is used to charge the first voltage unit 320 and the second voltage unit 330 respectively, so as to ensure that the voltage source module 30 provides voltage for the mechanical switch W.

[0046] According to Figure 2In the diagram provided, the first trigger switch TVS1 is first closed, causing the current source module and the mechanical switch to form a loop. The current source module provides a current signal to the mechanical switch, which generates a discharge arc under the action of the current signal. When the current provided by the current source module reaches a preset value, the second trigger switch TVS2 is closed, connecting the commutation module. The commutation module, the first and second trigger switches, and the mechanical switch form a loop. The commutation module provides a first reverse voltage to the mechanical switch. Under the action of the first reverse voltage, the conduction current and arc current (i.e., the discharge arc) of the mechanical switch are weakened until the arc current across the mechanical switch reaches zero. When the current crosses zero, the first and second trigger switches automatically disconnect according to their characteristics, thereby stopping the current source module and the commutation module from continuing to provide current and reverse voltage to the mechanical switch. At this time, the switch unit in the control voltage source module is internally selectively turned on, connecting the first voltage unit to the mechanical switch through the switch unit. The first voltage unit is pre-charged internally to obtain a second reverse voltage. The mechanical switch is turned on under the action of the second reverse voltage, generating a reverse current. By adjusting the conduction state inside the switch unit, connecting the second voltage unit, and charging the first voltage unit through the second voltage unit, according to the set parameter value, the voltage value in the first voltage unit in this application can be increased to a multiple of the output voltage of the second voltage unit to ensure that the mechanical switch is broken down during the voltage boosting process, and then the voltage at both ends of the mechanical switch at the time of breakdown is detected by the equipment, thereby achieving the purpose of detecting the recovery of the dielectric characteristics of the mechanical switch after arcing. By controlling the charging size of the first voltage unit in the voltage source module, a flexible control effect can be achieved, and at the same time, the pre-charging voltage of the charger can be reduced and the test voltage level can be improved.

[0047] According to the mechanical switch post-arc dielectric recovery characteristic test circuit provided in the present application, when the current passes through zero after the mechanical switch arcs, a second reverse voltage is provided to the mechanical switch by connecting the first voltage unit, and the first voltage unit is charged by connecting the second voltage unit, thereby increasing the voltage across the mechanical switch. When the mechanical switch reaches breakdown, the voltage across the mechanical switch is detected, thereby realizing the detection process of the dielectric recovery characteristics of the mechanical switch after arcing in the DC circuit breaker.

[0048] Figure 3 This is a structural diagram of another mechanical switch post-arc dielectric recovery characteristic test circuit provided in an embodiment of the present application. Figure 3 is Figure 2 Based on the introduction. Figure 3 As shown in the figure, the switch unit 310 includes a third trigger switch TVS3, a fourth trigger switch TVS4, a first single-pole switch K1, a second single-pole switch K2 and a first inductor L1.

[0049] One end of the first inductor L1 is electrically connected with the other end of the first trigger switch TVS1 and one end of the fourth trigger switch TVS4, and the other end of the first inductor L1 is electrically connected with one end of the fourth trigger switch TVS4.

[0050] The other end of the third trigger switch TVS3 is electrically connected with one end of the first voltage unit 320 and one end of the first single-throw switch K1.

[0051] The other end of the fourth trigger switch TVS4 is electrically connected with one end of the second voltage unit 330 and one end of the second single-throw switch K2.

[0052] The other end of the first single-throw switch K1 is electrically connected with the output end of the first voltage source U1 and the other end of the second single-throw switch K2.

[0053] The third trigger switch and the fourth trigger switch have the same function as the first trigger switch, and both have the function of automatically turning off when the current is zero.

[0054] The first single-throw switch K1 and the second single-throw switch K2 are used to form a charging circuit by closing the first single-throw switch K1 before detecting the characteristics of the mechanical switch W, and charging the first voltage unit 320; by closing the second single-throw switch K2, a charging circuit is formed between the second voltage unit 330 and the first voltage source U1, and the second voltage unit 330 is charged.

[0055] According to the above Figure 3 According to the above According to the above

[0056] According to Figure 3 The first voltage unit 320 includes a first capacitor C1, a second inductor L2, a first resistor R1, a third single-throw switch K3 and a fifth trigger switch TVS5 according to the provided diagram.

[0057] One end of the first capacitor C1 is electrically connected with the second end of the switch unit 310, one end of the second inductor L2 and one end of the third single-throw switch K3, and the other end of the first capacitor C1 is electrically connected with one end of the first resistor R1 and one end of the fifth trigger switch TVS5 and the ground terminal.

[0058] The other end of the second inductor L2 is electrically connected with the other end of the fifth trigger switch TVS5.

[0059] The other end of the third single-throw switch K3 is electrically connected with the other end of the first resistor R1.

[0060] The third single-throw switch K3 and the first resistor R1 are respectively used for controlling the discharge of the first capacitor C1 and absorbing the discharge energy of the capacitor C1, and the fifth trigger switch TVS5 and the second inductor L2 realize the discharge through single conduction and the voltage reversal of the first capacitor C3.

[0061] According to the structure of the first voltage unit 320, when the mechanical switch W current crosses zero, the first capacitor C1 is charged through the first voltage source U1 after the third single-throw switch K3 is closed in advance, and then the fifth trigger switch TVS5 is closed to form a loop composed of the fifth trigger switch TVS5, the second inductor L2 and the first capacitor C1, an LC oscillation loop is formed, the voltage direction of the first capacitor C1 is changed, and the second reverse voltage corresponding to the first capacitor C1 is obtained.

[0062] When the mechanical switch W arc current crosses zero, the second reverse voltage is provided to the mechanical switch W through the first capacitor C1 by closing the third trigger switch TVS3.

[0063] According to Figure 3 The second voltage unit 330 includes a second capacitor C2, a second resistor R2 and a fourth single-throw switch K4 according to the provided diagram.

[0064] One end of the second capacitor C2 is electrically connected with the fourth end of the switch unit 310 and one end of the fourth single-throw switch K4, and the other end of the second capacitor C2 is electrically connected with one end of the second resistor R2 and the ground terminal.

[0065] The other end of the second resistor R2 is electrically connected with the other end of the fourth single-throw switch K4.

[0066] The fourth single-pole switch K4 and the second resistor R2 are used for controlling the discharge of the second capacitor C2 and absorbing the discharge energy of the second capacitor C2 respectively.

[0067] According to the structure of the second voltage unit 330, before the mechanical switch detection, the second single-pole switch K2 is closed, and the second capacitor C2 is charged by the first voltage source U1. When the mechanical switch current is zero, the third trigger switch TVS3 is closed first, the second reverse voltage is provided to the mechanical switch by the first voltage unit, and the first capacitor C1, the second capacitor C2 and the first inductor L1 form a charging circuit by closing the fourth trigger switch TVS4, so as to charge the first capacitor C1, and the first capacitor C1 can reach the highest charging voltage which is twice the voltage corresponding to the second capacitor. Among them, the capacitance value of the second capacitor is much larger than that of the first capacitor. The charging of the first voltage unit is realized by the second voltage unit, and then the mechanical switch is assisted to increase the charging voltage and reduce the pre-charge voltage of the pre-charge machine.

[0068] According to Figure 3 The provided diagram, the voltage source module 30 further comprises a third resistor R3 and a fourth resistor R4.

[0069] One end of the third resistor R3 and one end of the fourth resistor R4 and the other end of the first trigger switch TVS1 are electrically connected, and the other end of the third resistor R3 is electrically connected with the first end of the switch unit 310.

[0070] The other end of the fourth resistor R4 is electrically connected with the ground end.

[0071] The third resistor R3 and the fourth resistor R4 are used as voltage dividing resistors, which can protect the circuit when the first capacitor C1 discharges. Since the third resistor R3 and the fourth resistor R4 form a loop with the first capacitor C1, the breakdown voltage of the mechanical switch W can be known by detecting the voltage across the fourth resistor R4 in parallel with the mechanical switch W when the mechanical switch W breaks down.

[0072] In a possible example scenario, according to Figure 3The provided diagram, the first voltage source U1 is responsible for charging the first capacitor C1, the second capacitor C2, respectively using K1, K2 control charging, while using K3 and R1 control the first capacitor C1 discharge and absorb the first capacitor C1 discharge energy, K4 and R2 are used to control the second capacitor C2 discharge and absorb the second capacitor C2 discharge energy. Through the fifth trigger switch TVS5 and the second inductor L2 can be discharged by single conduction, realize the voltage reverse of the first capacitor C1, get the second reverse voltage. When the mechanical switch current zero-crossing, through the third trigger switch TVS3 and the fourth trigger switch TVS4 control the first capacitor C1 and the second capacitor C2 input respectively. Input after the pre-charge of the first capacitor C1 after voltage reversal, through the voltage division of the third resistor R3 and the fourth resistor R4, the reverse voltage is applied to the mechanical switch W, and the second capacitor C2 is input after a certain time of reverse voltage is applied. The design requirement satisfies C4>>C3, after the second capacitor C2 is input, the first capacitor C1 is quickly charged to the positive voltage through the second inductor L2. At this time, the voltage applied to the mechanical switch W also changes with the voltage of the first capacitor C1. The first capacitor C1 eventually reaches 2 times the second capacitor C2. By adjusting the charging voltage of the first capacitor C1, the control of the reverse voltage applied to the mechanical switch W after arc extinction can be realized. By adjusting the charging voltage of the second capacitor C2, the control of the maximum breakdown voltage that the mechanical switch W can withstand after arc extinction can be realized. By adjusting the second inductor L2, the control of the transient voltage rise rate of the mechanical switch W after arc extinction can be realized. By adjusting the input time of the first capacitor C1 and the second capacitor C2, the control of the time when each voltage is applied to the mechanical switch W after arc can be realized.

[0073] Figure 4 is another mechanical switch arc after dielectric recovery characteristic test circuit structure provided by the embodiment of the application. Figure 4 is introduced on the basis of the first embodiment. According to Figure 4 The provided diagram, the current source module 10 includes a second voltage source U2, a fifth single knife switch K5, a third inductor L3, a third capacitor C3, a sixth single knife switch K6 and a fifth resistor R5.

[0074] The positive output end of the second voltage source U2 is electrically connected with one end of the fifth single knife switch K5, and the negative input end of the second voltage source U2 is electrically connected with one end of the third capacitor C3, one end of the fifth resistor R5 and a ground end.

[0075] The other end of the fifth single knife switch K5 is electrically connected with one end of the third inductor L3, the other end of the third capacitor C3 and one end of the sixth single knife switch K6.

[0076] The other end of the third inductor L3 is electrically connected with one end of the first trigger switch TVS1 and one end of the second trigger switch TVS2.

[0077] The other end of the sixth single-pole switch K6 is electrically connected with the other end of the fifth resistor R5.

[0078] According to Figure 4 The provided diagram, a large current can be generated by the current source module, and then the current flowing process in the working of the analog mechanical switch is realized.

[0079] The second voltage source U2 is responsible for charging the third capacitor C3, and the fifth single-pole switch K5 is used for controlling the charging. The sixth single-pole switch K6 and the fifth resistor R5 are respectively used for controlling the discharging of the third capacitor C3 and absorbing the discharging energy of the third capacitor C3. The pre-charged third capacitor C3, the third inductor L3, the external circuit and the measured mechanical switch W constitute a discharge circuit, and a current half-wave with a maximum current I1 will be generated, and I1 satisfies the formula 1:

[0080]

[0081] The first trigger switch TVS1 in the circuit controls the generation of the current. The control of the highest arcing current of the mechanical switch W can be realized by adjusting the charging voltage of the second voltage source U2.

[0082] According to Figure 4 The provided diagram, the commutation module 20 includes a third voltage source U3, a seventh single-pole switch K7, a fourth capacitor C4, a fourth inductor L4, a fifth inductor L5, an eighth single-pole switch K8, a sixth resistor R6 and a sixth trigger switch TVS6.

[0083] One end of the fourth inductor L4 is electrically connected with the other end of the second trigger switch TVS2, and the other end of the fourth inductor L4 is electrically connected with one end of the fifth inductor L5, one end of the seventh single-pole switch K7, one end of the eighth single-pole switch K8 and one end of the fourth capacitor C4.

[0084] The other end of the fifth inductor L5 is electrically connected with one end of the sixth trigger switch TVS6.

[0085] The other end of the sixth trigger switch TVS6 is electrically connected with one end of the sixth resistor R6, the other end of the fourth capacitor C4, the negative input end of the third voltage source U3 and the ground end.

[0086] The other end of the seventh single-pole switch K7 is electrically connected with the positive output end of the third voltage source U3.

[0087] The other end of the eighth single-pole switch K8 is electrically connected with the other end of the sixth resistor R6.

[0088] Optionally, according to Figure 4 The provided diagram, the commutation module 20 further includes a lightning arrester MOV1.

[0089] One end of the lightning arrester MOV1 is electrically connected with the other end of the fourth inductor L4, and the other end of the lightning arrester MOV1 is electrically connected with the ground terminal.

[0090] In the application, the circuit device is protected by adding the lightning arrester.

[0091] According to the structure of the commutation module, the current commutation after the mechanical switch is opened can be realized, and reliable arc extinction is guaranteed.

[0092] According to Figure 4 According to the provided diagram, the third voltage source U3 in the commutation module is responsible for charging the fourth capacitor C4, the seventh single-throw switch K7 is used for controlling the charging, the eighth single-throw switch K8 and the sixth resistor R6 are respectively used for controlling the discharging of the fourth capacitor C4 and absorbing the discharging energy of the fourth capacitor C4. The lightning arrester MOV1 is used for protecting the fourth capacitor C4 and absorbing the commutation current. The sixth trigger switch TVS6 and the fifth inductor L5 can realize the voltage reversal of the fourth capacitor C4 through single conduction discharge. The fourth capacitor C4, the fifth inductor L5 and the external circuit after pre-charging and reversal and the mechanical switch W constitute a commutation loop, and the reverse current with a maximum current I2 will flow through the mechanical switch, and I2 satisfies the formula 2:

[0093]

[0094] The vacuum trigger gap TVS6 in the loop controls the generation of the current.

[0095] In order to guarantee that the mechanical switch can reliably realize current zero arc extinction, the maximum reverse current I2 of the commutation platform and the maximum current I1 of the current source platform need to satisfy the formula 3:

[0096] I2>I1 3 formula

[0097] Under the above conditions, the control of the current drop rate before the current zero of the mechanical switch can be realized by adjusting the charging voltage of the third voltage source U3 or the fourth inductor L4.

[0098] In a possible example scenario, Figure 5 is a structure diagram of another mechanical switch arc-after dielectric recovery characteristic test circuit provided by the application. Figure 6 is a waveform diagram of a mechanical switch arc-after dielectric recovery characteristic test circuit provided by the application. Figure 6 is described on the basis of Figure 5 . Refer to Figure 5The provided diagram first supplies power to the mechanical switch through the second voltage source, so that the mechanical switch generates an arc current, when a certain value is obtained, the fourth capacitor is charged in advance through the third voltage source in the commutation module, the voltage of the fourth capacitor is changed reversely under the action of the sixth trigger switch, the first reverse voltage is obtained, the current zero processing of the mechanical switch is carried out by using the first reverse voltage, when the current of the mechanical switch is zero, the first trigger switch and the second trigger switch are turned off, the third trigger switch is turned on to connect the first capacitor, and the first capacitor provides a voltage signal for the mechanical switch. Since the first capacitor is reversed under the action of the fifth trigger switch, the second reverse voltage is obtained, and the mechanical switch is turned on under the action of the second reverse voltage. After the fourth trigger switch is closed, the first capacitor is charged by using the first inductor and the second capacitor. When the charging reaches the breakdown voltage of the mechanical switch, the mechanical switch breaks down. The breakdown voltage of the mechanical switch is detected by detecting the voltage of the voltage dividing resistor connected in parallel to the mechanical switch, and the arc after dielectric recovery characteristic of the mechanical switch is detected.

[0099] Reference Figure 6 The provided diagram can clearly see the state at different stages. At t1, the first trigger switch TVS1 is turned on, the current source module outputs half-wave current I1, and the current flows into the mechanical switch; at t2, the second trigger switch TVS2 is turned on, the commutation module outputs reverse current to drive the mechanical switch W to zero current, and the mechanical switch W breaking time can be selected at any time between t1 and t2; after the mechanical switch W current is zero, the third trigger switch TVS3 is turned on at t3, the first capacitor C1 is put into operation, and the mechanical switch W is subjected to reverse voltage; at t4, the fourth trigger switch TVS4 is turned on, the second capacitor C2 is put into operation, the first capacitor C1 is charged through the first inductor L1, the first capacitor C1 is charged to the forward voltage, the highest voltage can reach 2 times the voltage of the second capacitor C2, and the mechanical switch W is subjected to the rapidly rising forward voltage. Finally, when the mechanical switch W breaks down again at a certain time, the breakdown voltage amplitude can quantify the arc after dielectric recovery of the mechanical switch W.

[0100] According to Figure 4 The provided diagram uses the current source module to provide a current signal for the mechanical switch, and then the mechanical switch generates a discharge arc, and at the same time, the commutation module provides a reverse voltage for the mechanical switch to control the current zero processing of the mechanical switch. Further simulate the state of the mechanical switch working.

[0101] Figure 7 It is a flowchart of a mechanical switch arc after dielectric recovery characteristic test method provided by the embodiment of the application. According to Figure 7 The provided diagram, the steps of the mechanical switch arc after dielectric recovery characteristic test method specifically include the following S701-S703:

[0102] S701, control the first trigger switch to be turned on and the second trigger switch to be turned off, and determine that the current source module provides an arc current to the closed mechanical switch.

[0103] S702, control the first trigger switch and the second trigger switch to be turned on, and utilize the reverse voltage provided by the commutation module to the mechanical switch to perform zero-crossing processing on the arc current.

[0104] S703, in the case that the arc current is zero, utilize the voltage source module to provide a voltage signal to the mechanical switch, so that the mechanical switch reaches a breakdown voltage and voltage recovery detection is performed on the breakdown voltage.

[0105] By controlling the trigger switch, the operating state of the mechanical switch is simulated, the arc current is generated, and the current overcurrent processing is performed by the reverse voltage provided by the commutation module. When the current is zero, the mechanical switch is pressurized by the voltage source module, and when the breakdown voltage is reached, the voltage recovery detection on the breakdown voltage is realized by detecting the voltage between the mechanical switch. Unlike the method of directly stimulating the medium recovery characteristics after arc by using the breakdown voltage to detect the arc, the present application adjusts the voltage of the voltage source module to improve the detection flexibility and provide a reference for reducing the pre-charge voltage.

[0106] In a possible example scenario, the mechanical switch arc after medium recovery characteristic test method first performs a pre-experiment to understand the arc extinction time. The pre-experiment steps are as follows:

[0107] 1, close the mechanical switch W;

[0108] 2, charge the third capacitor C3 and the fourth capacitor C4 to a given value by using a charging machine;

[0109] 3, turn on the sixth trigger switch TVS6, and the fourth capacitor C4 realizes voltage reversal;

[0110] 4, set the action timing of the first trigger switch TVS1, the second trigger switch TVS2 and the mechanical switch W, start the pre-experiment, and obtain the arc extinction time.

[0111] After the pre-experiment understands the arc extinction time, the formal experiment is carried out, and the experiment steps are as follows:

[0112] 11, close the mechanical switch W;

[0113] 12, charge the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 to a given value by using a charging machine;

[0114] 13, turn on the sixth trigger switch TVS6 and the fifth trigger switch TVS5, and the first capacitor C1 and the fourth capacitor C4 realize voltage reversal;

[0115] 14. Set the action timing of TVS3, TVS4, TVS5, TVS6 and mechanical switch W, and carry out the test.

[0116] The mechanical switch arc-after dielectric recovery characteristic test circuit provided by the application has strong adaptability and expandability, can accurately control mechanical switch arc current, current drop rate before current zero, arc-after back pressure and forward transient recovery voltage, and factors such as switching-in time, simulates different stress adjustment of the mechanical switch, and thus measures the dielectric recovery characteristic of the mechanical switch. In addition, the circuit can amplify the capacitor pre-charging voltage, reduce the pre-charging voltage of the charging machine, improve the test voltage level, meet the test requirement of the arc-after dielectric recovery of the high-voltage mechanical switch, and improve the voltage multiple.

[0117] Figure 8 The structure schematic diagram of the mechanical switch arc-after dielectric recovery characteristic test device provided by the embodiment of the application is shown.

[0118] The mechanical switch arc-after dielectric recovery characteristic test device can include a processor 801 and a memory 802 having computer program instructions stored therein.

[0119] Specifically, the processor 801 can include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or can be configured to implement one or more integrated circuits of the embodiment of the application.

[0120] The memory 802 can include a mass storage for data or instructions. By way of example and not limitation, the memory 802 can include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory 802 can include removable or non-removable (or fixed) media. Where appropriate, the memory 802 can be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, the memory 802 is non-volatile solid-state memory.

[0121] The memory can include read-only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical / tangible memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software that, when executed (e.g., by one or more processors), is operable to perform operations described with reference to the methods according to an aspect of the present disclosure.

[0122] The processor 801 implements the mechanical switch arc-after medium recovery characteristic test method in any of the above embodiments by reading and executing computer program instructions stored in the memory 802.

[0123] In one example, the mechanical switch arc-after medium recovery characteristic test device can further include a communication interface 803 and a bus 810. As shown, the processor 801, the memory 802, and the communication interface 803 are connected through the bus 810 and complete communication with each other. Figure 8

[0124] The communication interface 803 is mainly used to realize the communication between the modules, devices, units and / or equipment in the embodiments of the present application.

[0125] The bus 810 includes hardware, software or both to couple components of the online data traffic billing device to each other. By way of example, and not limitation, the bus can include an accelerated graphics port (AGP) or other graphics bus, an enhanced industry standard architecture (EISA) bus, a front-side bus (FSB), a hypertransport (HT) interconnect, an industry standard architecture (ISA) bus, an infiniband interconnect, a low pin count (LPC) bus, a memory bus, a microchannel architecture (MCA) bus, a peripheral component interconnect (PCI) bus, a PCI-express (PCI-X) bus, a serial advanced technology attachment (SATA) bus, a video electronics standards association local (VLB) bus, or another suitable bus or a combination of two or more of these. Where suitable, the bus 810 can include one or more buses. Although specific buses are described and illustrated in the embodiments of the present application, the present application contemplates any suitable bus or interconnect.

[0126] The mechanical switch arc-after medium recovery characteristic test device can perform the online data traffic billing method in the embodiments of the present application based on the currently intercepted spam messages and the user reported messages, thereby realizing the mechanical switch arc-after medium recovery characteristic test method described in combination Figure 7 with the above embodiments.

[0127] In addition, in combination with the mechanical switch arc-after medium recovery characteristic test method in the above embodiments, the embodiments of the present application can provide a computer storage medium to realize. The computer storage medium has computer program instructions stored thereon; the computer program instructions are executed by the processor to realize the mechanical switch arc-after medium recovery characteristic test method in any of the above embodiments.

[0128] The embodiments of the present application also provide a computer program product, which includes a computer program, and the computer program is executed by the processor to realize the mechanical switch arc-after medium recovery characteristic test method in any of the above embodiments. ​

[0129] It is to be understood that the present application is not limited to the particular examples described and illustrated herein, and that the application includes a variety of configurations and processes. For simplicity, detailed descriptions of well-known methods and apparatuses are omitted so as not to obscure the description of the present application. In the above embodiments, several specific steps are described and illustrated as examples. However, the methods of the present application are not limited to the specific steps described and illustrated, and one skilled in the art can make various changes, modifications and additions, or can change the order of steps, after understanding the spirit of the present application.

[0130] The functional blocks shown in the block diagrams of the above described structures can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, functional cards, etc. When implemented in software, the elements of the present application are program or code segments for performing the required tasks. The program or code segments can be stored in a machine readable medium or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. The "machine readable medium" can include any medium that can store or transfer information. Examples of the machine readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segments can be downloaded via a computer network such as the Internet, intranet, etc.

[0131] It is also to be understood that the example embodiments described in the present application are based on a series of steps or apparatuses to describe some methods or systems. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in an order different from the embodiments, or several steps can be performed simultaneously.

[0132] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. These computer program instructions can also be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other processing devices to operate in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0133] The above is only a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be described here. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A mechanical switch post-arc dielectric recovery characteristic test circuit, characterized in that: include: A current source module, a commutation module, a voltage source module, a first trigger switch, a second trigger switch, and a mechanical switch; The output end of the current source module is electrically connected to one end of the first trigger switch and one end of the second trigger switch. The input end of the current source module, the input end of the commutation module, one end of the mechanical switch, and the input end of the voltage source module are connected to the ground end. The current source module is used to provide a current signal to the mechanical switch to cause the mechanical switch to perform current arcing. The other end of the second trigger switch is electrically connected to the output end of the commutation module, and the commutation module is used to provide a first reverse voltage to the mechanical switch when the current of the mechanical switch reaches a set arcing current, so as to make the mechanical switch perform current zero-crossing processing; The other end of the first trigger switch is electrically connected to the other end of the mechanical switch and the output end of the voltage source module. The voltage source module is used to provide a breakdown voltage to the mechanical switch after the current passes through zero.

2. The mechanical switch post-arc dielectric recovery characteristic test circuit according to claim 1, characterized in that: The voltage source module includes a switch unit, a first voltage unit, a second voltage unit and a first voltage source; The first end of the switch unit is electrically connected to the other end of the first trigger switch as the input end of the voltage source module, the second end of the switch unit is electrically connected to one end of the first voltage unit, the third end of the switch unit is electrically connected to the positive output end of the first voltage source, and the fourth end of the switch unit is electrically connected to one end of the second voltage unit. The switch unit is used to control the first voltage unit or the second voltage unit to be electrically connected to the mechanical switch; The other end of the first voltage unit, the other end of the second voltage unit and the negative input end of the first voltage source are connected to the ground end, the first voltage unit is used to provide a second reverse voltage to the mechanical switch, the second voltage unit is used to charge the first voltage unit, and the first voltage source is used to charge the first voltage unit and the second voltage unit.

3. The mechanical switch post-arc dielectric recovery characteristic test circuit according to claim 2, characterized in that: The switch unit includes a third trigger switch, a fourth trigger switch, a first single-pole switch, a second single-pole switch and a first inductor; One end of the first inductor is electrically connected to the other end of the first trigger switch and one end of the fourth trigger switch, and the other end of the first inductor is electrically connected to one end of the fourth trigger switch; The other end of the third trigger switch is electrically connected to one end of the first voltage unit and one end of the first single-pole switch; The other end of the fourth trigger switch is electrically connected to one end of the second voltage unit and one end of the second single-pole switch; The other end of the first single-pole switch is electrically connected to the output end of the first voltage source and the other end of the second single-pole switch.

4. The mechanical switch post-arc dielectric recovery characteristic test circuit according to claim 2, characterized in that: The first voltage unit includes a first capacitor, a second inductor, a first resistor, a third single-pole switch and a fifth trigger switch; One end of the first capacitor is electrically connected to the second end of the switch unit, one end of the second inductor, and one end of the third single-pole switch, and the other end of the first capacitor is electrically connected to one end of the first resistor, one end of the fifth trigger switch, and the ground end; The other end of the second inductor is electrically connected to the other end of the fifth trigger switch; The other end of the third single-pole switch is electrically connected to the other end of the first resistor.

5. The mechanical switch post-arc dielectric recovery characteristic test circuit according to claim 2, characterized in that: The second voltage unit includes a second capacitor, a second resistor and a fourth single-pole switch; One end of the second capacitor is electrically connected to the fourth end of the switch unit and one end of the fourth single-pole switch, and the other end of the second capacitor is electrically connected to one end of the second resistor and the ground end; The other end of the second resistor is electrically connected to the other end of the fourth single-pole switch.

6. The mechanical switch post-arc dielectric recovery characteristic test circuit according to claim 2, characterized in that: The voltage source module further includes a third resistor and a fourth resistor; One end of the third resistor is electrically connected to one end of the fourth resistor and the other end of the first trigger switch, and the other end of the third resistor is electrically connected to the first end of the switch unit; The other end of the fourth resistor is electrically connected to the ground end.

7. The mechanical switch post-arc dielectric recovery characteristic test circuit according to claim 1, characterized in that: The current source module includes a second voltage source, a fifth single-pole switch, a third inductor, a third capacitor, a sixth single-pole switch and a fifth resistor; The positive output terminal of the second voltage source is electrically connected to one end of the fifth single-pole switch, and the negative input terminal of the second voltage source is electrically connected to one end of the third capacitor, one end of the fifth resistor, and the ground terminal; The other end of the fifth single-pole switch is electrically connected to one end of the third inductor, the other end of the third capacitor, and one end of the sixth single-pole switch; The other end of the third inductor is electrically connected to one end of the first trigger switch and one end of the second trigger switch; The other end of the sixth single-pole switch is electrically connected to the other end of the fifth resistor.

8. The mechanical switch post-arc dielectric recovery characteristic test circuit according to claim 1, characterized in that: The commutation module includes a third voltage source, a seventh single-pole switch, a fourth capacitor, a fourth inductor, a fifth inductor, an eighth single-pole switch, a sixth resistor and a sixth trigger switch; One end of the fourth inductor is electrically connected to the other end of the second trigger switch, and the other end of the fourth inductor is electrically connected to one end of the fifth inductor, one end of the seventh single-pole switch, one end of the eighth single-pole switch, and one end of the fourth capacitor; The other end of the fifth inductor is electrically connected to one end of the sixth trigger switch; The other end of the sixth trigger switch is electrically connected to one end of the sixth resistor, the other end of the fourth capacitor, the negative input end of the third voltage source, and the ground end; The other end of the seventh single-pole switch is electrically connected to the positive output end of the third voltage source; The other end of the eighth single-pole switch is electrically connected to the other end of the sixth resistor.

9. The mechanical switch post-arc dielectric recovery characteristic test circuit according to claim 8, characterized in that: The commutation module further includes a lightning arrester; One end of the lightning arrester is electrically connected to the other end of the fourth inductor, and the other end of the lightning arrester is electrically connected to the ground end.

10. A method for testing the dielectric recovery characteristics of a mechanical switch after arcing, characterized in that: A circuit for testing the post-arc dielectric recovery characteristics of a mechanical switch according to any one of claims 1 to 9, comprising: Controlling the first trigger switch to be turned on and the second trigger switch to be turned off, and determining the arcing current provided by the current source module to the closed mechanical switch; controlling the first trigger switch and the second trigger switch to be turned on, and performing zero-crossing processing on the arcing current by using the reverse voltage provided by the commutation module to the mechanical switch; When the arcing current is zero, a voltage source module is used to provide a voltage signal to the mechanical switch, so that the mechanical switch reaches a breakdown voltage and a voltage recovery detection is performed on the breakdown voltage.

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