A high-power capacitor charging and discharging test system and test method

Abstract

The present invention relates to the technical field of capacitor charging and discharging, and in particular to a high-power capacitor charging and discharging test system and a test method. The high-power capacitor charging and discharging test system comprises a charging and discharging platform and a monitoring platform, wherein the charging and discharging platform is electrically connected to the monitoring platform, wherein the charging and discharging platform comprises a charging unit and a discharging unit, wherein the monitoring platform comprises an on-site measurement and control platform, an audio and video monitoring unit and a remote monitoring terminal, wherein the monitoring platform is used to realize charging and discharging control, dynamic monitoring, data management and remote monitoring of a pulse capacitor (C1) under test. The present invention has the advantages of high charging voltage and power, high intelligence, high safety performance and high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor charging and discharging, and in particular to a high-power capacitor charging and discharging test system and test method. Background Art

[0002] The charge and discharge test is an indispensable and important link in the development and testing of high-voltage and large-capacity pulse capacitors. With the increase in demand, the performance of high-voltage and large-capacity pulse capacitors is getting higher and higher, with a rated working voltage of more than 10,000 volts, a capacitance of several thousand microfarads, and a charge and discharge life of several thousand times. In the charge and discharge test of high-voltage and large-capacity pulse capacitors, the charging power is required to reach tens to hundreds of kilowatts, and the peak discharge power reaches the megawatt level. Metallized film capacitors are currently an important development direction for high-voltage and large-capacity pulse capacitors and are the most widely used. The high energy storage density metallized film capacitors required for electromagnetic emission have a monomer capacity greater than 1000μF, a rated working voltage of 10kV, a peak discharge current greater than 6kA, and a charge and discharge life greater than 5000 times. Therefore, high requirements are placed on the performance of the charge and discharge test system. Its charging voltage should not be less than 12kV, the charging power should reach more than 60kW, it should be able to withstand the megawatt-level peak discharge power, and it should have high reliability.

[0003] The existing pulse capacitor charge and discharge test device generally has low charging voltage and power, and the control and monitoring of the charge and discharge process are relatively simple, with a low degree of automation, and cannot meet the charge and discharge test requirements of high-voltage and large-capacity pulse capacitors. At the same time, the existing test device has high safety risks during the test process and has no remote monitoring function. Therefore, a high-power capacitor charge and discharge test system and test method are urgently needed. Summary of the invention

[0004] To solve the above problems, the present invention provides a high-power capacitor charging and discharging test system and test method, which has the advantages of high charging voltage and power, high intelligence, high safety performance and high reliability.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A high-power capacitor charge and discharge test system includes a charge and discharge platform and a monitoring platform, wherein the charge and discharge platform is electrically connected to the monitoring platform, the charge and discharge platform includes a charging unit and a discharging unit, the monitoring platform includes an on-site measurement and control platform, an audio and video monitoring unit and a remote monitoring terminal, and the monitoring platform is used to realize charge and discharge control, dynamic monitoring, data management and remote monitoring of a pulse capacitor under test.

[0007] Preferably, the charging unit includes a charging circuit and a high-voltage test circuit; the charging circuit is composed of an adjustable high-voltage constant-current power supply, a charging switch and a pulse capacitor under test in series, and is used to convert the AC power into a high-voltage constant-current charging power supply with an adjustable output voltage, and to perform high-voltage constant-current charging on the pulse capacitor under test; the high-voltage test circuit is composed of a high-voltage voltage divider, a high-voltage test switch and a pulse capacitor under test in series, and is used to test the charging voltage and discharge voltage of the pulse capacitor under test.

[0008] Preferably, the discharge unit includes a current limiting discharge circuit, a short-circuit discharge circuit, a capacitance test circuit and a temperature test device; the current limiting discharge circuit is composed of a current limiting discharge switch, a current limiting discharge resistor and a pulse capacitor to be tested to form a series circuit, and a current limiting discharge current transmitter is directly installed on the loop cable, which is used to perform current limiting discharge on the pulse capacitor to be tested and test the discharge current; the short-circuit discharge circuit is composed of an air gap discharge short-circuit switch, a sampling resistor and a pulse capacitor to be tested to form a series circuit, and a short-circuit discharge current transmitter is directly installed on the loop cable, and an oscilloscope is connected in parallel to the sampling resistor, which is used to perform short-circuit discharge on the pulse capacitor to be tested and test the discharge current and discharge voltage waveform; the capacitance test circuit is composed of an LCR test protection resistor, an LCR test switch, an LCR tester and a pulse capacitor to be tested in series, which is used to test the capacitance of the pulse capacitor to be tested; the thermometer is composed of a temperature sensor and a thermometer host, which is used to test the temperature of the pulse capacitor to be tested.

[0009] Preferably, the field measurement and control platform realizes the charge and discharge control of the measured pulse capacitor by sending a control signal to the charge and discharge platform; the control signal includes a first control signal, a second control signal, a third control signal, a fourth control signal, a fifth control signal and a sixth control signal; the first control signal is a digital signal, which is used to control the working state and output voltage of the adjustable high-voltage constant current power supply; the second control signal, the third control signal, the fourth control signal, the fifth control signal and the sixth control signal are all 220 volt AC signals, which respectively control the closing and opening of the charging switch, the high-voltage test switch, the LCR test switch, the current limiting discharge switch and the air gap discharge short-circuit switch; the field measurement and control platform obtains the voltage, temperature and current information of the measured pulse capacitor during the charging and discharging process through a high-voltage voltage divider, a thermometer, a current limiting discharge current transmitter and a short-circuit discharge current transmitter; and obtains the capacitance, voltage or current change curve information of the measured pulse capacitor during the charging and discharging process through the LCR tester and the oscilloscope.

[0010] Preferably, the current-limiting discharge current transmitter and the short-circuit discharge current transmitter adopt Rogowski coil current transmitter; the current-limiting discharge resistor is formed by connecting several high-power load resistors in parallel, the discharge power of each load resistor is not less than 10kW, and the total discharge power is 100kW; the charging switch, high-voltage test switch, LCR test switch, and current-limiting discharge switch adopt AC vacuum contactors; the air-gap discharge short-circuit switch adopts a pneumatic-driven mechanical switch; the sampling resistor R3 adopts a manganese copper milliohm resistor; the oscilloscope adopts a digital oscilloscope; the adjustable high-voltage constant-current power supply adopts a light adjustable AC / DC high-voltage test transformer with high-voltage, constant-current, and high-power output capabilities; the high-voltage voltage divider adopts an AC / DC high-voltage voltage divider with a 10,000-volt high-voltage test capability; the thermometer includes a temperature sensor and a thermometer host, the temperature sensor adopts a chip platinum thermal resistor temperature sensor, and the thermometer host adopts a multi-channel thermometer; the LCR tester adopts a precision LCR tester with large-capacity capacitor testing capabilities.

[0011] Preferably, the field monitoring platform adopts PXI / PXI-e bus automatic measurement and control equipment, and the PXI / PXI-e bus automatic measurement and control equipment includes a PXI / PXI-e bus hybrid chassis, a PXI-e bus controller, a PXI bus switch control module, a PXI bus data acquisition module, a PXI-e bus large-capacity storage module and a PXI bus GPIB communication module.

[0012] Preferably, the audio and video monitoring unit is composed of a high-definition panoramic camera and an omnidirectional microphone, and the remote monitoring terminal includes a computer host, a computer display screen, a speaker, a microphone, a network interface and remote monitoring software installed on the computer host.

[0013] A high-power capacitor charge and discharge test method, using the high-power capacitor charge and discharge test system as described above, a charge and discharge test process of the measured pulse capacitor, specifically comprising the following steps:

[0014] S1.1. The pulse capacitor to be tested is pressurized from the set starting charging voltage, charged to the rated voltage at the set boost speed, and maintained for the set charge holding time. While pressurizing, a real-time charging voltage test is performed. At this time, the control signal closes the charging switch and the high-voltage test switch, and disconnects the current limiting discharge switch, the air gap discharge short-circuit switch, and the LCR test switch;

[0015] S1.2. Perform current-limited discharge on the pulse capacitor under test, and perform real-time current-limited discharge current and voltage tests while discharging until the capacitor voltage drops to the set current-limited discharge cut-off voltage or reaches the current-limited discharge cut-off time. At this time, the control signal closes the current-limited discharge switch and the high-voltage test switch, and disconnects the charging switch, the air-gap discharge short-circuit switch, and the LCR test switch;

[0016] S1.3. Short-circuit the pulse capacitor under test for discharge, and perform real-time short-circuit discharge current and voltage tests while discharging until the capacitor voltage is 0, completing a charge and discharge test of the pulse capacitor under test. At this time, the control signal closes the air gap discharge short-circuit switch and the high-voltage test switch, and disconnects the charging switch, the current limiting discharge switch, and the LCR test switch.

[0017] Preferably, the charge and discharge life test process of the pulse capacitor under test comprises the following specific steps:

[0018] S2.1. Perform connection check and safety check on the high-power capacitor charge and discharge test system, and connect the measured pulse capacitor to the charge and discharge platform;

[0019] S2.2. Set the test parameters on the on-site measurement and control platform; when setting the current limiting discharge cut-off time parameter, the current limiting discharge cut-off time parameter t D Calculate according to the following formula: D =C·V0 2 / P D , where C is the capacitance of the pulse capacitor under test, V0 is the rated voltage of the pulse capacitor under test, P D To limit the discharge power, the capacitor voltage has dropped to 37% of its rated voltage;

[0020] S2.3 The on-site monitoring platform records the initial test cycle number n = 0;

[0021] S2.4. The tested pulse capacitor is subjected to a capacitance test. At this time, the control signal closes the LCR test switch, and the charging switch, high-voltage test switch, current-limiting discharge switch, and air-gap discharge short-circuit switch are disconnected;

[0022] S2.5. Determine whether the capacitance drop value of the pulse capacitor under test meets the set parameter conditions. If it does, continue to execute step S1.1, otherwise jump to step S2.8;

[0023] S1.1. The pulse capacitor to be tested is pressurized from the set starting charging voltage, charged to the rated voltage at the set boost speed, and maintained for the set charge holding time. While pressurizing, a real-time charging voltage test is performed. At this time, the control signal closes the charging switch and the high-voltage test switch, and disconnects the LCR test switch, the current limiting discharge switch, and the air gap discharge short-circuit switch;

[0024] S1.2. Perform current-limited discharge on the pulse capacitor under test, and perform real-time current-limited discharge current and voltage tests while discharging until the capacitor voltage drops to the set current-limited discharge cut-off voltage or reaches the current-limited discharge cut-off time. At this time, the control signal closes the high-voltage test switch and the current-limited discharge switch, and disconnects the charging switch, the LCR test switch, and the air-gap discharge short-circuit switch;

[0025] S1.3. Short-circuit the pulse capacitor under test and discharge it. Perform real-time short-circuit discharge current and voltage tests while discharging until the capacitor voltage is 0. This completes a charge and discharge test of the pulse capacitor under test. At this time, the control signal closes the high-voltage test switch and the air-gap discharge short-circuit switch, and the charging switch, the LCR test switch, and the current-limiting discharge switch are disconnected.

[0026] S2.6. The cumulative number of test cycles, that is, n = n + 1;

[0027] S2.7. Determine whether the test needs to be continued. If it is necessary to continue the test, jump to step S2.4. If it is not necessary to continue the test, execute S2.9. At this time, the charge and discharge life is the number of test cycles n;

[0028] S2.8 adjusts the number of test cycles n. When the capacitance drop value of the pulse capacitor under test does not meet the set parameter conditions, the number of test cycles n is reduced by 1, that is, n=n-1;

[0029] S2.9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the pulse capacitor under test is the number of test cycles n;

[0030] From step 2.1 to step 2.9, perform audio and video monitoring at the same time. The specific steps include:

[0031] S3.1. Conduct audio and video surveillance;

[0032] S3.2. Determine whether the monitoring condition is abnormal. If the result is abnormal, jump to step S2.9, otherwise continue to step S3.3;

[0033] S3.3. Determine whether to continue monitoring. If the result is that monitoring needs to be continued, jump to step S3.1, otherwise continue to step S2.9;

[0034] S2.9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the pulse capacitor under test is the number of test cycles n;

[0035] Start from step 2.3 and continue to step 2.9, and perform temperature test at the same time. The specific steps include:

[0036] S4.1. Conduct temperature test;

[0037] S4.2. Determine whether the measured temperature value is less than the threshold value. When the measured temperature value is not less than the threshold value, jump to step S2.9, otherwise continue to step S4.3;

[0038] S4.3. Determine whether to continue temperature measurement. If the result is that temperature measurement needs to be continued, jump to step S4.1, otherwise continue to step S2.9;

[0039] S2.9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the pulse capacitor under test is the number of test cycles n.

[0040] The beneficial effects of using the present invention are as follows: the present invention has high charging voltage and power, can automatically control the charging and discharging process of the pulse capacitor, and can implement dynamic monitoring of the test process, accurately control and obtain various parameters such as voltage, current, temperature, and capacitance during the charging and discharging process of the pulse capacitor; the present invention adopts a fast discharge method combining current limiting discharge with short-circuit discharge, and the discharge circuit does not produce large oscillations, thereby avoiding the adverse effects of reverse peak voltage on the life of the capacitor; the present invention has strong capabilities for automatic acquisition, storage, analysis and processing of test data and automatic generation of test reports, supports two operating modes, automatic testing and single-step testing, and supports remote monitoring of the test process through Ethernet; the present invention has a high degree of intelligence, high reliability, and good safety, and can meet the charging and discharging test requirements of high-voltage and large-capacity pulse capacitors. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A principle block diagram of a charging and discharging platform of a high-power capacitor charging and discharging test system provided by the present invention;

[0042] Figure 2 A principle block diagram of a monitoring platform for a high-power capacitor charging and discharging test system provided by the present invention;

[0043] Figure 3 A principle block diagram of a field measurement and control platform of a high-power capacitor charging and discharging test system provided by the present invention;

[0044] Figure 4 The present invention provides a test flow chart of a high-power capacitor charging and discharging test method. DETAILED DESCRIPTION

[0045] The present invention is described in detail below with reference to the accompanying drawings.

[0046] like Figure 1-Figure 2As shown, a high-power capacitor charge and discharge test system includes a charge and discharge platform and a monitoring platform, the charge and discharge platform is electrically connected to the monitoring platform, the charge and discharge platform includes a charging unit and a discharging unit, the monitoring platform includes an on-site measurement and control platform, an audio and video monitoring unit and a remote monitoring terminal, and the monitoring platform is used to realize charge and discharge control, dynamic monitoring, data management and remote monitoring of the pulse capacitor C1 under test. Through the audio and video monitoring unit and the remote monitoring terminal, the test process and test data can be monitored in real time, or the historical test process and test data can be queried. After an abnormal state is found, the on-site measurement and control platform can be notified to terminate the test.

[0047] The charging unit includes a charging circuit and a high-voltage test circuit; the charging circuit is composed of an adjustable high-voltage constant-current power supply D1, a charging switch K1 and a pulse capacitor C1 to be tested in series, which is used to convert the city power into a high-voltage constant-current charging power supply with adjustable output voltage, and to charge the pulse capacitor C1 under test with high voltage and constant current; the high-voltage test circuit is composed of a high-voltage voltage divider T1, a high-voltage test switch K2 and a pulse capacitor C1 to be tested in series, which is used to test the charging voltage and discharge voltage of the pulse capacitor C1 under test. As a high-voltage test equipment, the adjustable high-voltage constant-current power supply D1 has the ability to convert the city single-phase power into a constant current output of 10,000 volts adjustable voltage, several amperes current, and tens of kilowatts power. Under the control of the on-site measurement and control platform, the adjustable high-voltage constant-current power supply D1 will input 220V AC power after transformer boosting and high-voltage silicon stack rectification, and output 0-20kV 3A constant current DC power. The charging switch K1 uses an AC vacuum contactor with a carrying capacity of 10,000 volts voltage and several amperes current. Under the control of the on-site measurement and control platform, the charging switch K1 controls the on-off of the charging circuit. The charging switch K1 is in a closed state only when the pulse capacitor C1 under test needs to be charged. The high-voltage voltage divider T1 has a high-voltage test capability of 10,000 volts, which is used to test the charging voltage or discharge voltage of the pulse capacitor C1 under test. The test results can be transmitted to the on-site monitoring platform. The high-voltage test switch K2 has a voltage carrying capacity of 10,000 volts. An AC vacuum contactor similar to the charging switch K1 is selected, and its rated current can be lower than that of the charging switch K1. Under the control of the on-site measurement and control platform, the high-voltage test switch K2 controls the on-off of the high-voltage test circuit. When it is necessary to test the capacitance of the pulse capacitor C1 under test, the high-voltage test switch K2 is in a disconnected state to avoid the influence of the high-voltage voltage divider T1 on the capacitance test.

[0048] The discharge unit includes a current limiting discharge circuit, a short-circuit discharge circuit, a capacitance test circuit and a temperature test device; the current limiting discharge circuit is composed of a current limiting discharge switch K4, a current limiting discharge resistor R2 and a pulse capacitor C1 to be tested, forming a series circuit, and a current limiting discharge current transmitter T3 is directly mounted on the loop cable, which is used to perform current limiting discharge on the pulse capacitor C1 to be tested and test the discharge current; the short-circuit discharge circuit is composed of an air gap discharge short-circuit switch K5, a sampling resistor R3 and a pulse capacitor C1 to be tested, forming a series circuit, and a short-circuit discharge current transmitter T4 is directly mounted on the loop cable, and an oscilloscope G2 is connected in parallel to the sampling resistor R3, which is used to perform current limiting discharge on the pulse capacitor C1 to be tested and test the discharge current and discharge voltage waveform; the capacitance test circuit is composed of an LCR test protection resistor R1, an LCR test switch K3, an LCR tester G1 and a pulse capacitor C1 to be tested, which is used to test the capacitance of the pulse capacitor C1 to be tested; the thermometer T2 is composed of a temperature sensor and a thermometer host, which is used to test the temperature of the pulse capacitor C1 to be tested. The temperature sensor uses a chip platinum thermal resistor temperature sensor, which is pasted on the surface of the pulse capacitor C1 to be tested and connected to the main unit of the thermometer. When the temperature of the pulse capacitor C1 to be tested changes, the resistance of the platinum thermal resistor also changes accordingly. By detecting the change in the resistance of the platinum thermal resistor, the temperature of the pulse capacitor C1 to be tested is tested. The main unit of the thermometer detects the change in the resistance of the platinum thermal resistor temperature sensor connected to it, obtains the temperature of the pulse capacitor C1 to be tested after conversion, and transmits the test results to the on-site monitoring platform. The current limiting discharge switch K4 has a carrying capacity of 10,000 volts and tens of amperes. An AC vacuum contactor similar to the charging switch K1 is selected, and its rated current must be more than one order of magnitude higher than that of the charging switch K1. Under the control of the on-site control platform, the current limiting discharge switch K4 controls the on-off of the current limiting discharge circuit. The current limiting discharge switch K4 is in a closed state only when the pulse capacitor C1 to be tested needs current limiting discharge. The air gap discharge short-circuit switch K5 has a peak discharge and short-circuit capacity of tens of megawatts. It uses a pneumatically driven mechanical switch, and the pneumatic device drives the opening and closing of the two contacts of the mechanical switch. Both contacts are cylindrical copper materials with a diameter greater than 8 cm. Under the control of the on-site control platform, the pneumatic device of the mechanical switch controls the two contacts to gradually approach each other. When the distance between the contacts reaches the gas discharge condition, the air gap discharge begins. The two contacts continue to approach each other until they contact each other, closing the short-circuit discharge circuit. During the air gap discharge process, the peak discharge power reaches tens of megawatts. Only when the pulse capacitor C1 under test needs short-circuit discharge, the air gap discharge short-circuit switch K5 performs air gap discharge and closing action. The sampling resistor R3 is combined with the oscilloscope G2 to form a detection scheme for transient current and transient voltage in the short-circuit discharge circuit. The function of the sampling resistor R3 is to convert the current in the short-circuit discharge circuit into a lower voltage, which is convenient for real-time detection by the oscilloscope G2.In order to reduce the sampling voltage and power consumption of the sampling resistor R3, the smaller the resistance of the sampling resistor R3, the better. The sampling resistor R3 uses manganese copper milliohm resistors. This type of sampling resistor has the characteristics of strong conductivity and large overcurrent capacity. The accuracy is about 1%, which can meet the use requirements. The oscilloscope G2 has the ability to detect transient signals. Combined with the sampling resistor R3, it forms a detection scheme for transient current and transient voltage in the short-circuit discharge loop. The oscilloscope G2 has a GPIB bus interface, which is connected to the on-site measurement and control platform through the GPIB bus interface. Under the control of the on-site measurement and control platform, the oscilloscope G2 detects the sampling voltage of the sampling resistor R3 in real time through the bus trigger mode. After analysis and processing, the change curve of the short-circuit discharge voltage and current of the measured pulse capacitor C1 is obtained, and the detection results are transmitted to the on-site monitoring platform. The oscilloscope G2 uses a digital oscilloscope with functions such as signal acquisition, signal waveform reconstruction, signal memory and storage, which is particularly suitable for the detection of the transient discharge voltage waveform of the pulse capacitor. The LCR test protection resistor R1 has a large withstand voltage capability. When the circuit has high voltage due to misoperation, the LCR test protection resistor R1 plays a role of voltage division and current limiting in the circuit, thus protecting the LCR tester G1. The LCR test protection resistor R1 does not affect the measurement result of the capacitor capacitance. The resistance value of the LCR test protection resistor R1 is 1000Ω. The LCR test switch K3 uses an AC vacuum contactor similar to the charging switch K1, and has no requirements for the rated current. Under the control of the field control platform, the LCR test switch K3 controls the on-off of the capacitance test circuit. Only after the pulse capacitor C1 under test is fully discharged can the capacitance test be carried out; only when the capacitance test is carried out, the LCR test switch K3 can be in a closed state. The LCR tester G1 has the ability to test large-capacity capacitors of 1000 to 8000μF. Only after the pulse capacitor C1 under test is fully discharged can the capacitance test be carried out through the LCR tester G1. The LCR tester G1 has a GPIB bus interface, which is connected to the field control platform through the GPIB bus interface. Under the control of the field control platform, the LCR tester G1 performs capacitance test through Cs-Rs (series capacitor) working mode and bus triggering mode, and transmits the test results to the field control platform.

[0049] The on-site measurement and control platform realizes the charge and discharge control of the measured pulse capacitor C1 by sending a control signal to the charge and discharge platform; the control signal includes a first control signal S1, a second control signal S2, a third control signal S3, a fourth control signal S4, a fifth control signal S5 and a sixth control signal S6; the first control signal S1 is a digital signal used to control the working state and output voltage of the adjustable high-voltage constant current power supply D1; the second control signal S2, the third control signal S3, the fourth control signal S4, the fifth control signal S5 and the sixth control signal S6 are all 220 volts AC Signals are used to control the closing and opening of the charging switch K1, high-voltage test switch K2, LCR test switch K3, current-limiting discharge switch K4, and air-gap discharge short-circuit switch K5. The on-site measurement and control platform obtains the voltage, temperature, and current information of the pulse capacitor C1 under test during the charging and discharging process through the high-voltage voltage divider T1, the temperature meter T2, the current-limiting discharge current transmitter T3, and the short-circuit discharge current transmitter T4. The capacitance, voltage, or current change curve information of the pulse capacitor C1 under test during the charging and discharging process is obtained through the LCR tester G1 and the oscilloscope G2. The high-voltage voltage divider T1 is mainly used to test the charging voltage or discharge voltage of the pulse capacitor C1 under test. It uses an AC / DC high-voltage voltage divider, and its main performance is voltage level AC / DC50kV and voltage division ratio 1000:1.

[0050] The audio and video monitoring unit is composed of a high-definition panoramic camera and an omnidirectional microphone. Its function is to collect the video and audio information of the entire test process and transmit the information to the on-site measurement and control platform and remote monitoring terminal through the network. The audio and video monitoring unit is installed at the test site of the pulse capacitor, and its audio and video monitoring is required to fully cover the test area. A domestic high-definition panoramic camera with an omnidirectional microphone and a network interface is selected to realize the integration of audio and video monitoring, which is simple to install and use. The high-definition panoramic camera transmits the collected audio and video information to the on-site measurement and control platform and remote monitoring terminal through the network through its own network interface. The remote monitoring terminal consists of a computer host, a computer display, a speaker, a microphone, a network interface and remote monitoring software. Its function is to play, display, store and replay the audio and video information and test data of the test site, and establish an audio channel with the test site to realize the monitoring of the audio and video and test data of the test site. Through the remote monitoring terminal, the monitoring personnel can monitor the entire test process without having to go to the site in person or in a high-voltage dangerous environment, which greatly reduces the number of staff at the test site and improves the safety of the test. Audio and video monitoring: The remote monitoring terminal receives audio and video information from the high-definition panoramic camera through the network interface and decompresses it, plays it in real time through the computer display screen and speakers, and can also remotely query the audio and video historical information stored in the on-site measurement and control platform, thereby realizing real-time monitoring and historical query of the audio and video of the test site. Through the microphone, an audio communication channel is established between the remote monitoring terminal and the test site to realize the call function between the monitoring personnel and the on-site test personnel. Test data monitoring: The remote monitoring terminal receives the charging and discharging process control information, dynamic monitoring information and test reports from the on-site measurement and control platform through the network interface, and can also remotely query the charging and discharging process historical information and historical test reports stored in the on-site measurement and control platform, thereby realizing real-time monitoring and historical query of the test process. Remote monitoring software: It is installed on the computer host of the remote monitoring terminal, establishes a network communication channel with the on-site measurement and control platform, realizes the playback, display, query and storage of audio and video information and test data of the test site, and realizes the call contact with the test site, thereby realizing the monitoring of the test site. The remote monitoring software includes two modules: audio and video monitoring and data monitoring. Among them, the audio and video monitoring module includes sub-modules such as audio and video playback, audio and video query, audio and video storage, and on-site calls; the data monitoring module includes sub-modules such as data display, data query, and data storage.

[0051] like Figure 3As shown in the figure, the field measurement and control platform adopts PXI / PXI-e bus automatic measurement and control equipment, which includes PXI / PXI-e bus hybrid chassis, PXI-e bus controller, PXI bus switch control module, PXI bus data acquisition module, PXI-e bus large-capacity storage module and PXI bus GPIB communication module. The field measurement and control platform is an automatic measurement and control system platform built based on PXI / PXI-e bus modular instruments and virtual instruments. It mainly realizes system settings, process control, dynamic monitoring, data management (including automatic generation of test reports), remote monitoring and other functions. The PXI / PXI-e bus hybrid chassis is equipped with 1 system slot, multiple PXI-e slots and multiple PXI / PXI-e hybrid slots, etc., which is responsible for providing PXI / PXI-e bus connections between the PXI / PXI-e bus controller and each module. The measurement and control software is installed on the PXI-e bus controller of the field measurement and control platform, and the various functions of the field measurement and control platform are realized through the software. The measurement and control software includes test system settings, process control, dynamic monitoring, data management, and remote monitoring modules. The remote monitoring module mainly includes sub-modules such as audio and video monitoring and data monitoring, which are used to establish a network communication channel with the remote monitoring terminal to monitor the audio and video and test data of the test site. The PXI-e bus controller is a modular computer control module that integrates CPU, IO interface, display interface, network interface and other functions, and is installed in the chassis system slot in the form of a PXI-e bus card. The PXI-e bus controller realizes the overall control of the automatic measurement and control equipment through the PXI / PXI-e bus on the chassis; through the IO interface, it realizes the connection with the adjustable high-voltage constant-current power supply D1 and the thermometer T2, controls the working state and output voltage of the adjustable high-voltage constant-current power supply D1, and reads the temperature measurement data of the thermometer; through the network interface, it realizes the network communication with the audio and video monitoring unit and the remote monitoring terminal, controls the storage of audio and video information and the monitoring of the charging and discharging process by the remote monitoring terminal and the remote access to the historical test data; through the IO interface and the display interface, it is also connected with peripheral devices, and the peripheral devices include keyboard, mouse, display, printer, microphone, speaker, etc.; through the peripheral devices, the human-machine interface of the on-site monitoring platform is realized. The PXI bus switch control module is installed in the PXI / PXI-e hybrid slot of the chassis in the form of a PXI bus board, is connected to an external 220V AC power supply, is controlled by the PXI-e bus controller, and generates a total of 5 control signals, namely, the second control signal S2, the third control signal S3, the fourth control signal S4, the fifth control signal S5 and the sixth control signal S6. The control signal voltage is 220V AC.The PXI bus data acquisition module is installed in the PXI / PXI-e mixed slot of the chassis in the form of a PXI bus card, and is controlled by the PXI-e bus controller to collect the voltage output signals of the high-voltage divider T1, the current-limiting discharge current transmitter T3, and the short-circuit discharge current transmitter T4 to realize the function of patrol data acquisition. The PXI-e bus mass storage module is installed in the PXI-e slot of the chassis in the form of a PXI bus card, and is controlled by the PXI-e bus controller to realize the storage function of test information and audio and video information. The PXI bus GPIB communication module is installed in the PXI / PXI-e mixed slot of the chassis in the form of a PXI bus card, and is controlled by the PXI-e bus controller to establish a communication channel between the PXI-e bus controller and the LCR tester G1 and the oscilloscope G2.

[0052] The information monitored by the on-site measurement and control platform includes the voltage, temperature and current information obtained by the high-voltage divider T1, the thermometer T2, the current-limiting discharge current transmitter T3 and the short-circuit discharge current transmitter T4, and the capacitance, voltage or current change curve information obtained by the LCR tester G1 and the oscilloscope G2.

[0053] The current-limiting discharge resistor R2 is a high-power load of hundreds of kilowatts; the current-limiting discharge current transmitter T3 and the short-circuit discharge current transmitter T4 both use Rogowski coil current transmitters. The current-limiting discharge resistor R2 is composed of several high-power load resistors in parallel, and the discharge power of each load resistor is not less than 10kW, and the total discharge power is 100kW. The number of load resistors can also be adjusted according to the size of the current-limiting discharge power, so as to combine different current-limiting discharge resistance values ​​to meet different current-limiting discharge power requirements. The load resistor uses a ceramic insulated power resistor, which has the characteristics of high power, good high temperature resistance, and low price. The current-limiting discharge current transmitter T3 is used to test the current of the current-limiting discharge loop. It uses a Rogowski coil current transmitter. This type of current transmitter is a hollow ring structure, which is directly mounted on the measured loop cable. It has the characteristics of simple installation, good accuracy and linearity, and high reliability. The current-limiting discharge current transmitter T3 has a voltage output interface, which is connected to the on-site monitoring platform through the voltage output interface. The on-site monitoring platform detects the voltage output of the current-limiting discharge current transmitter T3, and calculates the current of the current-limiting discharge circuit through the transformation ratio. The short-circuit discharge current transmitter T4 is used to test the current of the short-circuit discharge circuit. It uses a Rogowski coil current transmitter similar to the current-limiting discharge current transmitter T3, and is directly mounted on the short-circuit discharge circuit cable. The on-site monitoring platform detects the voltage output of the short-circuit discharge current transmitter T4, and calculates the current of the short-circuit discharge circuit through the transformation ratio. The adjustable high-voltage constant current power supply D1 uses a light adjustable AC / DC high-voltage test transformer with high-voltage, constant current, and high-power output capabilities; the high-voltage voltage divider T1 uses an AC / DC high-voltage voltage divider with a 10,000-volt high-voltage test capability; the thermometer T2 includes a temperature sensor and a thermometer host, the temperature sensor uses a chip platinum thermal resistor temperature sensor, and the thermometer host uses a multi-channel thermometer; the LCR tester G1 uses a precision LCR tester with large-capacity capacitor testing capabilities.

[0054] like Figure 4As shown, a high-power capacitor charge and discharge test method, using the above-mentioned high-power capacitor charge and discharge test system, a charge and discharge test process of the pulse capacitor C1 under test, the specific steps include: S1.1. The pulse capacitor C1 under test is pressurized from the set starting charging voltage, charged to the rated voltage at a set boost speed, and maintained to the set charge holding time, and a real-time charging voltage test is performed while pressurizing. At this time, the control signal closes the charging switch K1 and the high-voltage test switch K2, and the current limiting discharge switch K4, the air gap discharge short-circuit switch K5, and the LCR test switch K3 are disconnected; S1.2. The pulse capacitor C1 under test is current-limited discharged, and real-time current limiting discharge is performed while discharging. The current and voltage test is performed until the capacitor voltage drops to the set current limiting discharge cut-off voltage or reaches the current limiting discharge cut-off time. At this time, the control signal closes the current limiting discharge switch K4 and the high-voltage test switch K2, and the charging switch K1, the air gap discharge short-circuit switch K5, and the LCR test switch K3 are disconnected; S1.3. Short-circuit discharge is performed on the pulse capacitor C1 under test, and real-time short-circuit discharge current and voltage tests are performed while discharging until the capacitor voltage is 0, completing a charge and discharge test of the pulse capacitor C1 under test. At this time, the control signal closes the air gap discharge short-circuit switch K5 and the high-voltage test switch K2, and the charging switch K1, the current limiting discharge switch K4, and the LCR test switch K3 are disconnected.

[0055] The charge and discharge life test process of the pulse capacitor C1 under test includes the following specific steps: S2.1. Performing connection check and safety check on the high-power capacitor charge and discharge test system, and connecting the pulse capacitor C1 under test to the charge and discharge platform; S2.2. Setting test parameters on the on-site measurement and control platform; when setting the current limiting discharge cut-off time parameter, the current limiting discharge cut-off time parameter t D Calculate according to the following formula: D =C·V0 2 / P D , where C is the capacitance of the pulse capacitor under test, V0 is the rated voltage of the pulse capacitor under test, P DThe current-limited discharge power is the voltage of the capacitor, which has dropped to 37% of its rated voltage; S2.3 The field monitoring platform records the number of initial test cycles n = 0; S2.4. The tested pulse capacitor C1 is subjected to a capacitance test, at which time the control signal closes the LCR test switch K3, and disconnects the charging switch K1, the high-voltage test switch K2, the current-limited discharge switch K4, and the air-gap discharge short-circuit switch K5; S2.5. Determine whether the capacitance drop value of the tested pulse capacitor C1 meets the set parameter conditions. If it does, continue to execute step S1.1, otherwise jump to step S2.8; S1. 1. Start to pressurize the pulse capacitor C1 under test from the set starting charging voltage, charge it to the rated voltage at the set boost speed, and maintain it for the set charge holding time. Perform real-time charging voltage test while pressurizing. At this time, the control signal closes the charging switch K1 and the high-voltage test switch K2, and disconnects the LCR test switch K3, the current limiting discharge switch K4, and the air gap discharge short-circuit switch K5; S1.2. Perform current limiting discharge on the pulse capacitor C1 under test, and perform real-time current limiting discharge current and voltage test while discharging until the capacitor voltage drops to the set current limiting discharge cut-off voltage or Until the current limiting discharge cut-off time is reached, at this time, the control signal closes the high-voltage test switch K2 and the current limiting discharge switch K4, and disconnects the charging switch K1, the LCR test switch K3, and the air gap discharge short-circuit switch K5; S1.3. Short-circuit discharge is performed on the pulse capacitor C1 under test, and real-time short-circuit discharge current and voltage tests are performed while discharging until the capacitor voltage is 0, completing a charge and discharge test of the pulse capacitor C1 under test. At this time, the control signal closes the high-voltage test switch K2 and the air gap discharge short-circuit switch K5, and the charging switch K1, the LCR test switch K3, and the current limiting discharge switch K4 is disconnected; S2.6. The cumulative number of test cycles, that is, n=n+1; S2.7. Determine whether the test needs to be continued. If it is necessary to continue the test, jump to step S2.4. If it is not necessary to continue the test, execute S2.9. At this time, the charge and discharge life is the number of test cycles n; S2.8 adjusts the number of test cycles n. When the capacitance drop value of the pulse capacitor C1 under test does not meet the set parameter conditions, the number of test cycles n is subtracted by 1, that is, n=n-1; S2.9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the pulse capacitor C1 under test is the number of test cycles n;

[0056] Starting from executing step 2.1 to step 2.9, audio and video monitoring is performed at the same time. The specific steps include: S3.1. Perform audio and video monitoring; S3.2. Determine whether the monitoring status is abnormal. When the judgment result is abnormal, jump to step S2.9, otherwise continue to execute step S3.3; S3.3. Determine whether it is necessary to continue monitoring. When the judgment result is that it is necessary to continue monitoring, jump to step S3.1, otherwise continue to execute step S2.9; S2.9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the tested pulse capacitor C1 is the number of test cycles n;

[0057] Starting from executing step 2.3 to step 2.9, perform temperature test at the same time. The specific steps include: S4.1. Perform temperature test; S4.2. Determine whether the measured temperature value is less than the threshold value. When the measured temperature value is not less than the threshold value, jump to step S2.9, otherwise continue to execute step S4.3; S4.3. Determine whether it is necessary to continue temperature measurement. When the judgment result is that the temperature measurement needs to be continued, jump to step S4.1, otherwise continue to execute step S2.9; S2.9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the pulse capacitor C1 under test is the number of test cycles n.

[0058] The present invention has two test modes: automatic test and single-step test. If the automatic test is selected, the on-site measurement and control platform automatically controls the present invention to perform the test in a cycle according to the test method and process, and the test is terminated only when the test end condition is met. If the single-step test is selected, the on-site measurement and control platform controls the present invention to perform capacitance testing, charging, current limiting discharge and short-circuit discharge in steps according to the test method and process. After each step, the test personnel must be asked whether to continue the next step of the test, and after each test cycle, the test personnel must be asked whether to enter the next test cycle. During the automatic test, if the number of test cycles is set, the on-site measurement and control platform automatically controls the present invention to perform the test in a cycle according to the test method and process, and the test is terminated only when the number of test cycles is completed or other test end conditions are met. When the set number of test cycles is the end of life or the number of test cycles is not set, the present invention will continue to perform the test in a cycle according to the selected test mode until the pulse capacitor under test meets the set test parameter end condition and the test is terminated.

[0059] In the present invention, the field measurement and control platform sends out a first control signal S1 to control the working state and output voltage of the adjustable high-voltage constant current power supply D1; sends out a second control signal S2, a third control signal S3, a fourth control signal S4, a fifth control signal S5 and a sixth control signal S6 to respectively control the closing and opening of the charging switch K1, the high-voltage test switch K2, the LCR test switch K3, the current-limiting discharge switch K4 and the air-gap discharge short-circuit switch K5, thereby controlling the relevant test circuits to realize the relevant test functions. The high-voltage voltage divider T1, the thermometer T2, the current-limiting discharge current transmitter T3 and the short-circuit discharge current transmitter T4 are always in working state during the test process, and continuously transmit the tested voltage, current and temperature information to the field measurement and control platform. The LCR tester G1 and the oscilloscope G2 are always in working state during the test process, and after the switch of the circuit in which they are located is closed, they automatically test the capacitance, voltage or current change curve, etc., and transmit the test results to the field measurement and control platform. The audio and video monitoring unit is always in working state during the test, continuously collecting audio and video information of the test site, and transmitting the information to the on-site measurement and control platform and remote monitoring terminal. The remote monitoring terminal can monitor the test process and test data in real time or query the historical test process and test data as needed. The specific working status of each device and the action relationship of each switch are shown in Table 1.

[0060] Table 1. Equipment control and operation status table (ON working state, OFF non-working state; OP closed state, CL open state; / irrelevant)

[0061]

[0062]

[0063] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A high-power capacitor charge and discharge test system, characterized by: It comprises a charging and discharging platform and a monitoring platform, wherein the charging and discharging platform is electrically connected to the monitoring platform, wherein the charging and discharging platform comprises a charging unit and a discharging unit, wherein the monitoring platform comprises an on-site measurement and control platform, an audio and video monitoring unit and a remote monitoring terminal, and wherein the monitoring platform is used to realize charging and discharging control, dynamic monitoring, data management and remote monitoring of a pulse capacitor (C1) under test; The charging unit comprises a charging circuit and a high-voltage test circuit; the charging circuit is formed by connecting an adjustable high-voltage constant-current power supply (D1), a charging switch (K1) and a pulse capacitor (C1) in series, and is used to convert the mains power into a high-voltage constant-current charging power supply with an adjustable output voltage, and to perform high-voltage constant-current charging on the pulse capacitor (C1) under test; the high-voltage test circuit is formed by connecting a high-voltage voltage divider (T1), a high-voltage test switch (K2) and a pulse capacitor (C1) under test in series, and is used to test the charging voltage and the discharging voltage of the pulse capacitor (C1) under test; The discharge unit comprises a current limiting discharge circuit, a short-circuit discharge circuit, a capacitance test circuit and a temperature measuring instrument (T2); the current limiting discharge circuit comprises a current limiting discharge switch (K4), a current limiting discharge resistor (R2) and a pulse capacitor (C1) to be tested to form a series circuit, and a current limiting discharge current transmitter (T3) is directly mounted on the loop cable, which is used to perform current limiting discharge on the pulse capacitor (C1) to be tested and test the discharge current; the short-circuit discharge circuit comprises an air gap discharge short-circuit switch (K5), a sampling resistor (R3) and a pulse capacitor (C1) to be tested to form a series circuit, and a current limiting discharge current transmitter (T3) is directly mounted on the loop cable, which is used to perform current limiting discharge on the pulse capacitor (C1) to be tested and test the discharge current; A short-circuit discharge current transmitter (T4) is connected in parallel with an oscilloscope (G2) on a sampling resistor (R3), which is used to perform short-circuit discharge on a pulse capacitor (C1) to be tested and test the discharge current and discharge voltage waveforms; the capacitance test loop is formed by a LCR test protection resistor (R1), an LCR test switch (K3), an LCR tester (G1) and a pulse capacitor (C1) to be tested connected in series, which is used to test the capacitance of the pulse capacitor (C1) to be tested; the temperature meter (T2) is composed of a temperature sensor and a temperature meter host, which is used to test the temperature of the pulse capacitor (C1) to be tested; The on-site measurement and control platform realizes the charge and discharge control of the measured pulse capacitor (C1) by sending a control signal to the charge and discharge platform; the control signal includes a first control signal (S1), a second control signal (S2), a third control signal (S3), a fourth control signal (S4), a fifth control signal (S5) and a sixth control signal (S6); the first control signal (S1) is a digital signal, which is used to control the working state and output voltage of the adjustable high-voltage constant-current power supply (D1); the second control signal (S2), the third control signal (S3), the fourth control signal (S4), the fifth control signal (S5) and the sixth control signal (S6) are all 220 The on-site measurement and control platform obtains the voltage, temperature and current information of the pulse capacitor (C1) under test during the charging and discharging process through the high-voltage voltage divider (T1), the temperature measuring instrument (T2), the current-limiting discharge current transmitter (T3) and the short-circuit discharge current transmitter (T4); and obtains the capacitance, voltage or current change curve information of the pulse capacitor (C1) under test during the charging and discharging process through the LCR tester (G1) and the oscilloscope (G2); The temperature sensor adopts a chip platinum thermal resistance temperature sensor, the temperature measuring instrument host adopts a multi-channel temperature measuring instrument; the LCR tester (G1) adopts a precision LCR tester with large-capacitance capacitance testing capability.

2. The high-power capacitor charge and discharge test system according to claim 1 is characterized in that: The current-limiting discharge current transmitter (T3) and the short-circuit discharge current transmitter (T4) adopt Rogowski coil current transmitters; the current-limiting discharge resistor (R2) is formed by connecting a number of high-power load resistors in parallel, the discharge power of each load resistor is not less than 10kW, and the total discharge power is 100kW; the charging switch (K1), the high-voltage test switch (K2), the LCR test switch (K3), and the current-limiting discharge switch (K4) adopt AC vacuum contactors; the air-gap discharge short-circuit switch (K5) adopts a pneumatically driven mechanical switch; the adjustable high-voltage constant-current power supply (D1) adopts a light adjustable AC / DC high-voltage test transformer with high-voltage, constant-current, and high-power output capabilities; the high-voltage voltage divider (T1) adopts an AC / DC high-voltage voltage divider with a 10,000-volt high-voltage test capability.

3. The high-power capacitor charge and discharge test system according to claim 2 is characterized in that: The field measurement and control platform adopts PXI / PXI-e bus automatic measurement and control equipment, and the PXI / PXI-e bus automatic measurement and control equipment includes a PXI / PXI-e bus hybrid chassis, a PXI-e bus controller, a PXI bus switch control module, a PXI bus data acquisition module, a PXI-e bus large-capacity storage module and a PXI bus GPIB communication module.

4. The high-power capacitor charge and discharge test system according to claim 3 is characterized in that: The audio and video monitoring unit is composed of a high-definition panoramic camera and an omnidirectional microphone, and the remote monitoring terminal includes a computer host, a computer display screen, a speaker, a microphone, a network interface and remote monitoring software installed on the computer host.

5. A high-power capacitor charge and discharge test method, using the high-power capacitor charge and discharge test system according to claim 3, characterized in that: The one-time charge and discharge test process of the pulse capacitor (C1) under test comprises the following specific steps: S1.

1. The pulse capacitor (C1) to be tested is pressurized from the set starting charging voltage, charged to the rated voltage at the set boost speed, and maintained for the set charge holding time. While pressurizing, a real-time charging voltage test is performed. At this time, the control signal closes the charging switch (K1) and the high-voltage test switch (K2), and disconnects the current limiting discharge switch (K4), the air gap discharge short-circuit switch (K5), and the LCR test switch (K3); S1.

2. Perform current-limited discharge on the pulse capacitor (C1) under test, and perform real-time current-limited discharge current and voltage tests while discharging until the capacitor voltage drops to the set current-limited discharge cut-off voltage or reaches the current-limited discharge cut-off time. At this time, the control signal closes the current-limited discharge switch (K4) and the high-voltage test switch (K2), and disconnects the charging switch (K1), the air-gap discharge short-circuit switch (K5), and the LCR test switch (K3); S1.

3. Perform short-circuit discharge on the pulse capacitor under test (C1), and perform real-time short-circuit discharge current and voltage tests while discharging until the capacitor voltage is 0, completing a charge and discharge test of the pulse capacitor under test (C1). At this time, the control signal closes the air gap discharge short-circuit switch (K5) and the high-voltage test switch (K2), and disconnects the charging switch (K1), the current limiting discharge switch (K4), and the LCR test switch (K3).

6. A high-power capacitor charge and discharge test method according to claim 5, characterized in that: The charge and discharge life test process of the pulse capacitor (C1) under test comprises the following specific steps: S2.

1. Perform connection check and safety check on the high-power capacitor charge and discharge test system, and connect the measured pulse capacitor (C1) to the charge and discharge platform; S2.

2. Set the test parameters on the on-site measurement and control platform; when setting the current limiting discharge cut-off time parameter, the current limiting discharge cut-off time parameter t D Calculate according to the following formula: D =C·V0 2 / P D , where C is the capacitance of the pulse capacitor under test, V0 is the rated voltage of the pulse capacitor under test, P D To limit the discharge power, the capacitor voltage has dropped to 37% of its rated voltage; S2.

3. The on-site measurement and control platform records the initial test cycle number n = 0; S2.

4. The tested pulse capacitor (C1) is subjected to a capacitance test. At this time, the control signal closes the LCR test switch (K3), and the charging switch (K1), the high-voltage test switch (K2), the current-limiting discharge switch (K4), and the air-gap discharge short-circuit switch (K5) are disconnected; S2.

5. Determine whether the capacitance drop value of the pulse capacitor (C1) under test meets the set parameter conditions. If it does, continue to execute step S1.1, otherwise jump to step S2.8; S1.

1. The pulse capacitor (C1) to be tested is pressurized from the set starting charging voltage, charged to the rated voltage at the set boost speed, and maintained for the set charge holding time. While pressurizing, a real-time charging voltage test is performed. At this time, the control signal closes the charging switch (K1) and the high-voltage test switch (K2), and disconnects the LCR test switch (K3), the current limiting discharge switch (K4), and the air gap discharge short-circuit switch (K5); S1.

2. Perform current-limited discharge on the pulse capacitor (C1) under test, and perform real-time current-limited discharge current and voltage tests while discharging until the capacitor voltage drops to the set current-limited discharge cut-off voltage or reaches the current-limited discharge cut-off time. At this time, the control signal closes the high-voltage test switch (K2) and the current-limited discharge switch (K4), and the charging switch (K1), the LCR test switch (K3), and the air-gap discharge short-circuit switch (K5) are disconnected; S1.

3. Short-circuit the pulse capacitor (C1) under test and discharge it. Perform real-time short-circuit discharge current and voltage tests while discharging until the capacitor voltage is 0. This completes a charge and discharge test of the pulse capacitor (C1) under test. At this time, the control signal closes the high-voltage test switch (K2) and the air-gap discharge short-circuit switch (K5), and the charging switch (K1), the LCR test switch (K3), and the current-limiting discharge switch (K4) are disconnected. S2.

6. The cumulative number of test cycles, that is, n = n + 1; S2.

7. Determine whether the test needs to be continued. If it is necessary to continue the test, jump to step S2.

4. If it is not necessary to continue the test, execute S2.

9. At this time, the charge and discharge life is the number of test cycles n; S2.8 adjusts the test cycle number n. When the capacitance drop value of the pulse capacitor (C1) under test does not meet the set parameter conditions, the test cycle number n is reduced by 1, that is, n=n-1; S2.

9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the pulse capacitor (C1) under test is the number of test cycles n. Execute step 2.1 until step 2.9, and perform audio and video monitoring at the same time. The specific steps include: S3.

1. Conduct audio and video surveillance; S3.

2. Determine whether the monitoring condition is abnormal. If the result is abnormal, jump to step S2.9, otherwise continue to step S3.3; S3.

3. Determine whether to continue monitoring. If the result is that monitoring needs to be continued, jump to step S3.1, otherwise continue to step S2.9; S2.

9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the pulse capacitor (C1) under test is the number of test cycles n. Execute step 2.3 until step 2.9, and perform the temperature test at the same time. The specific steps include: S4.

1. Conduct temperature test; S4.

2. Determine whether the measured temperature value is less than the threshold value. When the measured temperature value is not less than the threshold value, jump to step S2.9, otherwise continue to step S4.3; S4.

3. Determine whether to continue temperature measurement. If the result is that temperature measurement needs to be continued, jump to step S4.1, otherwise continue to step S2.9; S2.

9. Stop the charge and discharge test, and the monitoring platform generates a test report. The charge and discharge life of the pulse capacitor (C1) under test is the number of test cycles n.

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