Multi-pulse lightning impulse test method and test device

Abstract

The invention discloses a multi-pulse lightning impulse test method and device, and the method comprises the steps: generating a continuous multi-pulse current according to an obtained target test parameter, carrying out the multi-pulse lightning impulse test of a to-be-tested sample through the continuous multi-pulse current, and obtaining the temperature distribution data and electrical performance parameter data of the to-be-tested sample, and generating an impact test result of the to-be-tested sample according to the temperature distribution data and the electrical performance parameter data. According to the multi-pulse lightning impulse test method disclosed by the invention, the natural lightning waveform is simulated through continuous multi-pulse current, so that the practicability and reliability of an impulse test result are improved; and through the change data of the temperature data and the change data of the electrical performance data, the heat effect influence and the multi-pulse current influence of the to-be-tested sample under the multi-pulse lightning impulse test are comprehensively considered, so that the accuracy and the comprehensiveness of the impulse test result are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning impulse testing, and in particular to a multi-pulse lightning impulse testing method and a testing device. Background Art

[0002] With the rapid development of economic construction, the application of electronic information equipment has penetrated into all areas of national economy, national defense construction and people's lives, and various electronic and microelectronic equipment has been widely used in all walks of life. Since these systems and equipment have low high voltage resistance, when the high voltage of direct lightning or induced lightning and the lightning electromagnetic pulse invade, the electromagnetic effect and thermal effect generated will cause interference or permanent damage to the system and equipment. In order to avoid and reduce the losses caused by lightning disasters, various lightning protection and surge protection equipment have appeared on the market. These lightning protection equipment need to be tested for performance after production to check whether they meet the use standards.

[0003] However, the traditional lightning impulse test only uses a single pulse to test the lightning protection equipment. However, this simulation method cannot accurately reflect the characteristics of multi-pulse lightning in nature. In addition, the traditional lightning impulse test also ignores the impact of thermal effects on the performance of lightning protection equipment and lacks an evaluation of the thermal stability of the arrester. Therefore, it is difficult for the traditional lightning impulse test to accurately and comprehensively evaluate the lightning protection equipment, affecting the safety and reliability of the power system. Summary of the invention

[0004] The present invention provides a multi-pulse lightning impulse test method and a test device, aiming to solve the above technical problems and to improve the accuracy and comprehensiveness of the performance test of lightning protection equipment.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a multi-pulse lightning impulse test method, comprising the following steps:

[0006] Obtaining samples to be tested and target test parameters;

[0007] Generate a continuous multi-pulse current according to the target test parameter, and perform a multi-pulse lightning impulse test on the sample to be tested by using the continuous multi-pulse current;

[0008] During the multi-pulse lightning impulse test, the temperature distribution data and the electrical performance parameter data of the sample to be tested are obtained, and the impulse test result of the sample to be tested is generated according to the temperature distribution data and the electrical performance parameter data.

[0009] The multi-pulse lightning impulse test method provided by the present invention first generates a continuous multi-pulse current that simulates a natural lightning waveform according to the acquired target test parameters, and then performs a multi-pulse lightning impulse test on the sample to be tested through the generated continuous multi-pulse current, that is, applying the continuous multi-pulse current to the sample to be tested to simulate the natural lightning impact on the sample to be tested. The simulation of the natural lightning waveform by the continuous multi-pulse current can effectively improve the practicality and reliability of the impact test results. During the impact test, the temperature distribution data and electrical performance parameter data of the sample to be tested will also be collected in real time, and then the impact tolerance and aging characteristics of the sample to be tested will be evaluated through the acquired temperature distribution data and electrical performance parameter data change data, that is, the thermal effect and multi-pulse current of the sample to be tested under the multi-pulse lightning impulse test are comprehensively considered through the change data of the temperature data and the change data of the electrical performance data, and the impact test results of the sample to be tested generated in this way can improve the accuracy and comprehensiveness of the impact test results.

[0010] As a preferred example, the target test parameters include a target test voltage, a target pulse number, a target pulse interval and a target pulse amplitude.

[0011] The generated multi-pulse current is adjusted and controlled through the above-mentioned various target test parameters to maximize the similarity between the multi-pulse current and the complex waveform of natural lightning, provide a more accurate lightning impulse test environment for subsequent multi-pulse lightning impulse tests, and then improve the accuracy and practicality of the impulse test results.

[0012] As a preferred example, the step of performing a multi-pulse lightning impulse test on the sample to be tested by using the continuous multi-pulse current includes:

[0013] Applying the continuous multi-pulse current to the sample to be tested according to the target pulse interval in the target test parameter;

[0014] When the continuous multi-pulse current is applied, the pulse current of the continuous multi-pulse current is obtained to obtain a discharge pulse sequence.

[0015] The generated multi-pulse current is applied to the sample to be tested according to the target pulse interval set by the target test parameters to simulate the impact characteristics of natural lightning on the sample to be tested. While performing the impact test, the corresponding pulse current will be obtained from the current signal of the continuous multi-pulse current to generate the corresponding discharge pulse sequence as reference data for the subsequent evaluation of the impact test results of the sample to be tested. The corresponding pulse current is directly obtained from the device that emits the multi-pulse current. Compared with collecting the pulse current from the sample to be tested or collecting the pulse current from the transmission process of the multi-pulse current, the pulse current obtained is more accurate, and the accuracy of the measured pulse current is also improved.

[0016] As a preferred example, generating the impact test result of the sample to be tested according to the temperature distribution data and the electrical performance parameter data includes:

[0017] Associating the discharge pulse sequence with the temperature distribution data and the electrical performance parameter data respectively to obtain a plurality of discharge sequence temperature data and a plurality of discharge sequence performance data;

[0018] Correlation processing is performed on a plurality of the discharge sequence temperature data and the discharge sequence performance data to obtain a plurality of discharge event change data;

[0019] An impact test is performed on the sample to be tested according to a plurality of the discharge event change data to obtain the impact test result.

[0020] After completing the acquisition of the temperature distribution data and electrical performance parameter data of the sample to be tested, the temperature distribution data and electrical performance parameter data can be classified into corresponding different discharge events according to the stored discharge pulse sequence, that is, each discharge event of the discharge pulse sequence corresponds to unique temperature distribution data and electrical performance parameter data. The test method provided by the present invention determines the corresponding several discharge sequence temperature data through the correlation relationship between the discharge pulse sequence and each temperature distribution data, and determines the corresponding several discharge sequence performance data through the correlation relationship between the discharge pulse sequence and each electrical performance parameter data. After determining several discharge sequence temperature data and several discharge sequence performance data, the data in the above two types of data can be associated according to the discharge pulse sequence data in the above two types of data, so as to obtain the discharge event change data corresponding to the discharge pulse sequence, the temperature distribution data and the electrical performance parameter data.

[0021] By determining the change data of the discharge event, we can intuitively determine the change curve of the temperature distribution data and electrical performance parameter data of the sample to be tested as the multi-pulse lightning impulse continues, and use this as a reference to test and evaluate the test results of the sample to be tested, and output the corresponding impact test results. By integrating the temperature distribution data, electrical performance parameter data, and the impact test results formed by the discharge pulse sequence, the accuracy, comprehensiveness, and practicality of the test results can be effectively improved.

[0022] As a preferred example, the generating of a continuous multi-pulse current according to the target test parameter, and performing a multi-pulse lightning impulse test on the sample to be tested by the continuous multi-pulse current, further includes:

[0023] Acquire the test environment data of the sample to be tested, and compare the test environment data with preset standard environment data to obtain an environment comparison result;

[0024] When the environmental comparison result is that the test environmental data meets the standard environmental data, a continuous multi-pulse current is generated according to the target test parameters, and a multi-pulse lightning impulse test is performed on the sample to be tested by the continuous multi-pulse current.

[0025] In order to further improve the accuracy of the impact test results, the test method provided by the present invention will also obtain the test environment data of the sample to be tested before the impact test is performed on the sample to be tested, and detect and judge the obtained test environment data, and compare it with the standard environment data to determine whether it meets the test requirements, thereby ensuring that the test environment of the sample to be tested meets the predetermined test requirements. Only after it is determined that the test environment data meets the test requirements, the multi-pulse lightning impact test of the sample to be tested is started to ensure the accuracy of the test results.

[0026] At the same time, since the various performances of the samples to be tested may undergo different changes in extreme environments, the test environment data of the samples to be tested are detected before the samples are tested, which can also achieve accurate monitoring and evaluation of the performance changes of the samples to be tested in extreme environments, thereby improving the accuracy of the test results in evaluating the environmental adaptability of the samples to be tested.

[0027] As a preferred example, the acquiring of the test environment data of the sample to be tested, and comparing the test environment data with preset standard environment data to obtain an environment comparison result, further includes:

[0028] When the environmental comparison result is that the test environmental data does not conform to the standard environmental data, an environmental alarm signal is triggered, and the generation of continuous multi-pulse current according to the target test parameters is suspended.

[0029] If the monitoring determines that the current test environment data does not meet the preset standard environment data, that is, it does not meet the requirements for multi-pulse lightning impulse testing of the sample to be tested, a test alarm signal for the test environment will be triggered, and the impulse test of the sample to be tested will be suspended. Users can store the test environment data according to actual needs and start the impulse test of the sample to be tested by themselves, so as to obtain the impulse test results of the sample to be tested in extreme environments, and then realize the performance change data of the lightning impulse test of the sample to be tested in extreme environments.

[0030] Similarly, the user can also pause the impact test on the sample to be tested and adjust the test environment until the adjusted test environment data meets the test requirements and then start the impact test on the sample to be tested, so as to improve the accuracy of the impact test results.

[0031] As a preferred example, the step of generating the impact test result of the sample to be tested according to the temperature distribution data and the electrical performance parameter data further includes:

[0032] Associating the impact test result with the target test parameter to obtain impact test data, and storing the impact test data in a preset impact test database;

[0033] Perform data trend analysis on the impact test data in the impact test database at preset time intervals to obtain and output a trend analysis report.

[0034] After completing the impact test on the sample to be tested and obtaining the corresponding impact test results, the test method provided by the present invention will also associate the target test parameters of this test with the impact test results as the impact test data of this impact test, and store the integrated impact test data in a preset impact test database for subsequent user calls. In addition, historical data comparison and test data trend analysis will be performed on the test data in the impact test database at preset time intervals to obtain the changes in the electrical performance parameters of the sample to be tested within the preset interval time period, and by generating a trend analysis report, help users conduct in-depth analysis of the changes in the impact test performance parameters of the sample to be tested.

[0035] As a preferred example, the step of obtaining the sample to be tested and the target test parameters includes:

[0036] Obtaining preset sample parameter data of the original sample, and comparing the sample parameter data with preset sample standard data to obtain a sample comparison result;

[0037] When the sample comparison result is that the sample parameter data meets the sample standard data, the original sample is used as the sample to be tested, and the target test parameters are obtained.

[0038] Before impact testing the sample to be tested, in order to ensure the integrity of the sample to be tested, the impact testing method provided by the present invention will also detect the sample parameter data of the original sample, that is, compare the sample parameter data of the original sample with the preset sample standard data, and determine whether the original sample meets the basic sample requirements for the impact test based on the sample comparison result. Only after it is determined that the original sample meets the requirements of the impact test can the original sample be used as the sample to be tested for subsequent impact testing. By improving the quality of the sample to be tested, the accuracy and reliability of the test data can be improved.

[0039] Correspondingly, an embodiment of the present invention further provides a multi-pulse lightning impulse test device, which includes a central controller, a trigger control system, a discharge circuit and an infrared thermal imaging device; wherein:

[0040] The central controller is used to execute a multi-pulse lightning impulse test method as described in any one of the above items;

[0041] The trigger control system is used to receive the target test parameters sent by the central controller, generate a pulse current trigger signal according to the target test parameters, and send the pulse current trigger signal to the discharge circuit;

[0042] The discharge circuit is used to receive the pulse current trigger signal sent by the trigger control system, and generate corresponding continuous multi-pulse current according to the pulse current trigger signal;

[0043] The infrared thermal imaging device is used to collect temperature distribution data of the sample to be tested during a multi-pulse lightning impulse test, and send the temperature distribution data to the central processing unit.

[0044] As a preferred example, the multi-pulse lightning impulse test device further includes a test equipment calibration system; wherein:

[0045] The test equipment calibration system is used to obtain the test equipment data of the multi-pulse lightning impulse test device at preset time intervals, and feed the test equipment data back to the central processor so that the central processor compares the test equipment data with the pre-stored standard equipment data, and if the comparison result is that the test equipment data conforms to the standard equipment data, an equipment calibration report is generated according to the test equipment data for storage.

[0046] In order to improve the accuracy of the test results and the efficiency of fault detection of the test equipment, the impact test device provided by the present invention also includes an equipment calibration system. The equipment calibration system will obtain the test equipment data of the test equipment before the impact test is performed on the sample to be tested, and compare it with the standard equipment data to determine whether it meets the test requirements of the test equipment. In addition, before the impact test is performed on the sample to be tested, the test equipment data is calibrated with the standard equipment data, which can also ensure the consistency and accuracy of the test result data when the test equipment performs the impact test on the sample to be tested.

[0047] When the comparison results show that the acquired test equipment data conforms to the standard equipment data, that is, it conforms to the equipment requirements for testing the sample to be tested, before the impact test is performed on the sample to be tested, an equipment calibration report on the test equipment will be generated and stored to facilitate subsequent user tracing of test equipment failure problems when needed. At the same time, the constantly updated equipment calibration report database also facilitates users to more intuitively obtain performance changes of test equipment, so that users can maintain and update test equipment in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 :A flow chart of an embodiment of the multi-pulse lightning impulse test method provided by the present invention;

[0049] Figure 2 : A structural diagram of an embodiment of a multi-pulse lightning impulse test device provided by the present invention;

[0050] Figure 3 : A basic circuit diagram of the impulse current generator provided by the present invention;

[0051] Figure 4 : The overall electrical schematic diagram of the multi-pulse impulse current generator provided by the present invention;

[0052] Figure 5 : A device structure diagram of an embodiment of a trigger control system provided by the present invention;

[0053] Figure 6 : A pulse ignition control principle diagram of the trigger control system provided by the present invention;

[0054] Figure 7 : The pulse lightning waveform diagram provided by the present invention. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] Embodiment 1

[0057] Please refer to Figure 1 , which is a flow chart of an embodiment of the multi-pulse lightning impulse test method provided by the present invention, including steps 101 to 103, each step is specifically as follows:

[0058] Step 101: Obtain a sample to be tested and target test parameters.

[0059] The impact test method provided in the embodiment of the present invention first needs to obtain the sample to be tested and the reference parameters for the impact test on the sample to be tested, that is, the target test parameters. The corresponding natural lightning waveform simulation can be generated by the obtained target test parameters, thereby realizing the lightning impact test on the sample to be tested.

[0060] It should be noted that the user can input the target test parameters and view the corresponding impact test results, and in order to further study the impact test results, the analysis report of the impact test results can also be exported for viewing. In this embodiment, the sample to be tested is preferably a zinc oxide varistor, but the embodiment of the present invention does not further limit the specific type of the sample to be tested.

[0061] Specifically, the target test parameters provided in this embodiment include a target test voltage, a target number of pulses, a target pulse interval, and a target pulse amplitude.

[0062] The generated multi-pulse current is adjusted and controlled through the above-mentioned various target test parameters to maximize the similarity between the multi-pulse current and the complex waveform of natural lightning, provide a more accurate lightning impulse test environment for subsequent multi-pulse lightning impulse tests, and then improve the accuracy and practicality of the impulse test results.

[0063] It should be noted that since the natural lightning waveform that needs to be simulated in this embodiment is a multi-pulse lightning impulse waveform, the target number of pulses set in this embodiment includes at least two, and the interval between each pulse, that is, the target pulse interval, is at least 20 milliseconds. By setting the number of pulses and the pulse interval, the waveform parameters of natural lightning and the impulse characteristics of natural lightning are simulated as much as possible, thereby improving the practicality and accuracy of the test results.

[0064] In this embodiment, in order to realize multi-pulse lightning impulse testing, a pulse lightning impulse testing device with a discharge time of 1μs~999μs, i.e. a short interval, and 1ms~999ms, i.e. a long interval, and an accuracy within ±1μs is designed to meet the testing requirements of different waveforms.

[0065] In addition, before obtaining the sample to be tested and the target test parameters, this embodiment includes:

[0066] Obtaining preset sample parameter data of the original sample, and comparing the sample parameter data with preset sample standard data to obtain a sample comparison result;

[0067] When the sample comparison result is that the sample parameter data meets the sample standard data, the original sample is used as the sample to be tested, and the target test parameters are obtained.

[0068] Before impact testing the sample to be tested, in order to ensure the integrity of the sample to be tested, the impact testing method provided in the embodiment of the present invention will also detect the sample parameter data of the original sample, that is, compare the sample parameter data of the original sample with the preset sample standard data, and determine whether the original sample meets the basic sample requirements for the impact test based on the sample comparison result. Only after it is determined that the original sample meets the requirements of the impact test can the original sample be used as the sample to be tested for subsequent impact testing. By improving the quality of the sample to be tested, the accuracy and reliability of the test data can be improved.

[0069] Step 102: Generate a continuous multi-pulse current according to the target test parameters, and perform a multi-pulse lightning impulse test on the sample to be tested by using the continuous multi-pulse current.

[0070] After the acquisition of the sample to be tested and the target test parameters is completed, the corresponding continuous multi-pulse current can be generated according to the target test parameters, including setting the number of pulses of the continuous multi-pulse current and the interval between each pulse according to the number of pulses and pulse interval in the target test parameters, and setting the pulse amplitude of the pulse current according to the pulse amplitude in the test parameters, so as to generate a continuous multi-pulse current that is more similar to the natural lightning waveform. After the continuous multi-pulse current is generated, a multi-pulse lightning impulse test can be performed on the sample to be tested according to the generated continuous multi-pulse current.

[0071] It should be noted that the impact testing method provided by the present invention also provides a method for remote monitoring of the impact testing process. By setting a communication interface on the testing device, the test data and analysis results can be transmitted wirelessly or wired to the remote monitoring user end, thereby enabling the user to remotely monitor the impact test and maintain the test process.

[0072] In addition, this embodiment also provides a safety protection method for the impulse test process, which is used to automatically cut off the power supply when an abnormal situation is detected to protect the safety of the test equipment and operators, so as to improve the stability and safety of the lightning impulse test.

[0073] The impulse test method provided in this embodiment realizes the simulation of at least two consecutive lightning strikes through a simultaneous sequential triggering method and a multi-path discharge method, and the single waveform of each pulse is 8 / 20μs, while the pulse time interval is flexibly adjustable, thereby simulating the natural lightning waveform.

[0074] In addition, before generating a continuous multi-pulse current according to the target test parameter and performing a multi-pulse lightning impulse test on the sample to be tested by using the continuous multi-pulse current, this embodiment further includes:

[0075] Acquire the test environment data of the sample to be tested, and compare the test environment data with preset standard environment data to obtain an environment comparison result;

[0076] When the environmental comparison result is that the test environmental data meets the standard environmental data, a continuous multi-pulse current is generated according to the target test parameters, and a multi-pulse lightning impulse test is performed on the sample to be tested by the continuous multi-pulse current.

[0077] In order to further improve the accuracy of the impact test results, the test method provided by the present invention will also obtain the test environment data of the sample to be tested before the impact test is performed on the sample to be tested, and detect and judge the obtained test environment data, and compare it with the standard environment data to determine whether it meets the test requirements, thereby ensuring that the test environment of the sample to be tested meets the predetermined test requirements. Only after it is determined that the test environment data meets the test requirements, the multi-pulse lightning impact test of the sample to be tested is started to ensure the accuracy of the test results.

[0078] At the same time, since the various performances of the samples to be tested may undergo different changes in extreme environments, the test environment data of the samples to be tested are detected before the samples are tested, which can also achieve accurate monitoring and evaluation of the performance changes of the samples to be tested in extreme environments, thereby improving the accuracy of the test results in evaluating the environmental adaptability of the samples to be tested.

[0079] Specifically, the present embodiment obtains the test environment data of the sample to be tested, and compares the test environment data with preset standard environment data to obtain an environment comparison result, and further includes:

[0080] When the environmental comparison result is that the test environmental data does not conform to the standard environmental data, an environmental alarm signal is triggered, and the generation of continuous multi-pulse current according to the target test parameters is suspended.

[0081] If the monitoring determines that the current test environment data does not meet the preset standard environment data, that is, it does not meet the requirements for multi-pulse lightning impulse testing of the sample to be tested, a test alarm signal for the test environment will be triggered, and the impulse test of the sample to be tested will be suspended. Users can store the test environment data according to actual needs and start the impulse test of the sample to be tested by themselves, so as to obtain the impulse test results of the sample to be tested in extreme environments, and then realize the performance change data of the lightning impulse test of the sample to be tested in extreme environments.

[0082] Similarly, the user can also pause the impact test on the sample to be tested and adjust the test environment until the adjusted test environment data meets the test requirements and then start the impact test on the sample to be tested, so as to improve the accuracy of the impact test results.

[0083] Specifically, this embodiment performs a multi-pulse lightning impulse test on the sample to be tested by using the continuous multi-pulse current, including:

[0084] Applying the continuous multi-pulse current to the sample to be tested according to the target pulse interval in the target test parameter;

[0085] When the continuous multi-pulse current is applied, the pulse current of the continuous multi-pulse current is obtained to obtain a discharge pulse sequence.

[0086] The generated multi-pulse current is applied to the sample to be tested according to the target pulse interval set by the target test parameters to simulate the impact characteristics of natural lightning on the sample to be tested. While performing the impact test, the corresponding pulse current will be obtained from the current signal of the continuous multi-pulse current to generate the corresponding discharge pulse sequence as reference data for the subsequent evaluation of the impact test results of the sample to be tested. The corresponding pulse current is directly obtained from the device that emits the multi-pulse current. Compared with collecting the pulse current from the sample to be tested or collecting the pulse current from the transmission process of the multi-pulse current, the pulse current obtained is more accurate, and the accuracy of the measured pulse current is also improved.

[0087] It should be noted that when the impact testing method provided in this embodiment applies many pulse currents to the sample to be tested, it is preferred to use a pulse current extraction collar to extract the pulse current from the generated continuous multi-pulse current. On the one hand, it can be used as reference data for subsequent classification of the collected temperature distribution data and electrical performance parameter data. On the other hand, the pulse current is directly extracted from one end of the continuous multi-pulse current. Compared with extracting the pulse current from the sample to be tested, the extracted pulse current will be more accurate.

[0088] Furthermore, by recording each pulse current of the continuous multi-pulse discharge current, each discharge event can be accurately captured. By integrating each captured discharge event into a sequence, the discharge pulse sequence provided in this embodiment can be obtained, thereby ensuring that each discharge event can be reliably recorded under the action of multiple lightning strikes, wherein the interval time between each discharge event is not less than 20 milliseconds.

[0089] Step 103: During the multi-pulse lightning impulse test, the temperature distribution data and the electrical performance parameter data of the sample to be tested are obtained, and the impulse test result of the sample to be tested is generated according to the temperature distribution data and the electrical performance parameter data.

[0090] When the pulse lightning impulse test is performed on the sample to be tested through continuous multi-pulse current, the temperature distribution data on the surface of the sample to be tested and the electrical performance parameter data of the sample to be tested will be obtained in real time. The change data generated by the above two data as the impulse test continues to be performed can be integrated to obtain and output the corresponding impulse test results. Users can conduct in-depth analysis of the impulse test results to obtain the performance change data of the sample to be tested under the multi-pulse lightning impulse test, and then evaluate the impact tolerance and aging characteristics of the sample to be tested.

[0091] It should be noted that the impact testing method provided by the present invention can evaluate the action state and overvoltage condition of the sample to be tested based on the electrical performance parameter data obtained from the sample to be tested, that is, the action signal data caused by the multi-pulse lightning impact test, so as to determine the performance and reliability of the sample to be tested.

[0092] Specifically, this embodiment generates the impact test result of the sample to be tested according to the temperature distribution data and the electrical performance parameter data, including:

[0093] Associating the discharge pulse sequence with the temperature distribution data and the electrical performance parameter data respectively to obtain a plurality of discharge sequence temperature data and a plurality of discharge sequence performance data;

[0094] Correlation processing is performed on a plurality of the discharge sequence temperature data and the discharge sequence performance data to obtain a plurality of discharge event change data;

[0095] An impact test is performed on the sample to be tested according to a plurality of the discharge event change data to obtain the impact test result.

[0096] After completing the acquisition of the temperature distribution data and electrical performance parameter data of the sample to be tested, the temperature distribution data and electrical performance parameter data can be classified into corresponding different discharge events according to the stored discharge pulse sequence, that is, each discharge event of the discharge pulse sequence corresponds to unique temperature distribution data and electrical performance parameter data. The test method provided by the present invention determines the corresponding several discharge sequence temperature data through the correlation relationship between the discharge pulse sequence and each temperature distribution data, and determines the corresponding several discharge sequence performance data through the correlation relationship between the discharge pulse sequence and each electrical performance parameter data. After determining several discharge sequence temperature data and several discharge sequence performance data, the data in the above two types of data can be associated according to the discharge pulse sequence data in the above two types of data, so as to obtain the discharge event change data corresponding to the discharge pulse sequence, the temperature distribution data and the electrical performance parameter data.

[0097] By determining the change data of the discharge event, we can intuitively determine the change curve of the temperature distribution data and electrical performance parameter data of the sample to be tested as the multi-pulse lightning impulse continues, and use this as a reference to test and evaluate the test results of the sample to be tested, and output the corresponding impact test results. By integrating the temperature distribution data, electrical performance parameter data, and the impact test results formed by the discharge pulse sequence, the accuracy, comprehensiveness, and practicality of the test results can be effectively improved.

[0098] Furthermore, after generating the impact test result of the sample to be tested according to the temperature distribution data and the electrical performance parameter data, this embodiment further includes:

[0099] Associating the impact test result with the target test parameter to obtain impact test data, and storing the impact test data in a preset impact test database;

[0100] Perform data trend analysis on the impact test data in the impact test database at preset time intervals to obtain and output a trend analysis report.

[0101] After completing the impact test on the sample to be tested and obtaining the corresponding impact test results, the test method provided by the present invention will also associate the target test parameters of this test with the impact test results as the impact test data of this impact test, and store the integrated impact test data in a preset impact test database for subsequent user calls. In addition, historical data comparison and test data trend analysis will be performed on the test data in the impact test database at preset time intervals to obtain the changes in the electrical performance parameters of the sample to be tested within the preset interval time period, and by generating a trend analysis report, help users conduct in-depth analysis of the changes in the impact test performance parameters of the sample to be tested.

[0102] In summary, the multi-pulse lightning impulse test method provided by the embodiment of the present invention first generates a continuous multi-pulse current that simulates the natural lightning waveform according to the acquired target test parameters, and then performs a multi-pulse lightning impulse test on the sample to be tested through the generated continuous multi-pulse current, that is, the continuous multi-pulse current is applied to the sample to be tested to simulate the natural lightning impact on the sample to be tested. The simulation of the natural lightning waveform by the continuous multi-pulse current can effectively improve the practicality and reliability of the impact test results. During the impact test, the temperature distribution data and electrical performance parameter data of the sample to be tested will also be collected in real time, and then the impact tolerance and aging characteristics of the sample to be tested will be evaluated through the acquired temperature distribution data and electrical performance parameter data. That is, the thermal effect and multi-pulse current of the sample to be tested under the multi-pulse lightning impulse test are comprehensively considered through the change data of the temperature data and the change data of the electrical performance data. The impact test results of the sample to be tested generated in this way can improve the accuracy and comprehensiveness of the impact test results.

[0103] Accordingly, see Figure 2 , Figure 2 This is a structural diagram of an embodiment of the multi-pulse lightning impulse test device provided by the present invention. Figure 2 As shown, the multi-pulse lightning impulse test device includes a central controller, a trigger control system, a discharge circuit and an infrared thermal imaging device; wherein:

[0104] The central controller is used to execute a multi-pulse lightning impulse test method as described in any one of the above items;

[0105] The trigger control system is used to receive the target test parameters sent by the central controller, generate a pulse current trigger signal according to the target test parameters, and send the pulse current trigger signal to the discharge circuit;

[0106] The discharge circuit is used to receive the pulse current trigger signal sent by the trigger control system, and generate corresponding continuous multi-pulse current according to the pulse current trigger signal;

[0107] The infrared thermal imaging device is used to collect temperature distribution data of the sample to be tested during a multi-pulse lightning impulse test, and send the temperature distribution data to the central processing unit.

[0108] In this embodiment, the discharge circuit provided by the test device is composed of a plurality of capacitors connected in series and in parallel, and also includes one or more inductors and one or more resistors. The inductor is connected in series with the capacitor to control the waveform of the discharge current to simulate the characteristics of different lightning impulses; and the resistor is also connected in parallel with the capacitor to limit the peak value of the discharge current to protect the test equipment from damage.

[0109] The trigger control system provided by the test device includes multiple high-voltage trigger gaps and a control circuit. Each high-voltage trigger gap is connected to a capacitor of a corresponding discharge circuit to generate an electric spark at a predetermined time to trigger the capacitor to discharge; the control circuit includes a microprocessor and a timer to control the discharge timing of the high-voltage trigger gap to simulate different lightning impulse waveforms.

[0110] Specifically, the multi-pulse lightning impulse test device provided in this embodiment also includes a test equipment calibration system; wherein:

[0111] The test equipment calibration system is used to obtain test equipment data of the multi-pulse lightning impulse test device at preset time intervals, and compare the test equipment data with pre-stored standard equipment data, and if the comparison result is that the test equipment data conforms to the standard equipment data, generate an equipment calibration report based on the test equipment data for storage.

[0112] In order to improve the accuracy of the test results and the efficiency of fault detection of the test equipment, the impact test device provided by the present invention also includes an equipment calibration system. The equipment calibration system will obtain the test equipment data of the test equipment before the impact test is performed on the sample to be tested, and compare it with the standard equipment data to determine whether it meets the test requirements of the test equipment. In addition, before the impact test is performed on the sample to be tested, the test equipment data is calibrated with the standard equipment data, which can also ensure the consistency and accuracy of the test result data when the test equipment performs the impact test on the sample to be tested.

[0113] When the comparison results show that the acquired test equipment data conforms to the standard equipment data, that is, it conforms to the equipment requirements for testing the sample to be tested, before the impact test is performed on the sample to be tested, an equipment calibration report on the test equipment will be generated and stored to facilitate subsequent user tracing of test equipment failure problems when needed. At the same time, the constantly updated equipment calibration report database also facilitates users to more intuitively obtain performance changes of test equipment, so that users can maintain and update test equipment in a timely manner.

[0114] If the comparison result shows that the test equipment data does not conform to the standard equipment data, it means that the current state of the test equipment does not meet the requirements for impact testing. In this case, an alarm signal for the test equipment will be triggered, prompting the user to repair the test equipment. At the same time, a corresponding equipment calibration report will be generated and output based on the test equipment data to facilitate users to troubleshoot the test equipment. Through real-time monitoring of the test equipment data, the accuracy of the test results of the samples to be tested can be avoided due to the influence of faulty equipment, thereby improving the accuracy and reliability of the test result data.

[0115] Embodiment 2

[0116] In order to explain in detail the specific implementation scheme of the multi-pulse lightning impulse test method provided in the first embodiment, the present invention also provides another embodiment. This embodiment provides another multi-pulse lightning impulse test platform, which is to connect multiple capacitors in series and in parallel through the impulse current generator of its main body, and then charge the multiple capacitors through the rectified voltage or constant current mode, and then control the gap discharge to generate the impulse current simulating natural lightning to perform the impulse test on the sample to be tested, specifically as follows Figure 3 As shown, Figure 3 The basic circuit diagram of the impulse current generator provided by the present invention. The platform provided by this embodiment realizes accurate testing of the impulse resistance capability of the sample under multi-pulse lightning impulse through advanced electronic control technology and precise circuit design, solving the limitations of traditional experimental equipment in simulating complex lightning environments.

[0117] Compared with the multi-pulse lightning impulse test platform provided in the first embodiment, another multi-pulse lightning impulse test platform provided in this embodiment includes not only the various module devices included in the platform provided in the first embodiment, but also a charging device and a signal processing unit.

[0118] The charging device is used to charge the capacitor in the discharge circuit to a predetermined voltage, and includes a transformer and a rectifier circuit, which are used to convert alternating current into direct current and charge the capacitor.

[0119] The signal processing unit is used to record and analyze the changes in the electrical performance parameters of the sample under test, including parameters such as the voltage, leakage current and nonlinear coefficient of the sample under test.

[0120] For the multi-pulse lightning impulse test platform provided in this embodiment, this embodiment also provides a corresponding test method, and the specific steps are as follows:

[0121] The first step is to charge the capacitor of the discharge circuit to a predetermined voltage by a charging device; wherein the predetermined voltage is determined by the rated voltage of the sample to be tested;

[0122] The second step is to control the capacitor to discharge according to the predetermined target test parameters by triggering the control system to generate continuous multi-pulse current to perform impact test on the sample to be tested;

[0123] The third step is to use an infrared thermal imaging device to monitor the surface temperature distribution data of the sample under test during the multi-pulse impact process;

[0124] The fourth step is to record and analyze the electrical performance parameter change data of the tested sample through the signal processing unit;

[0125] The fifth step is to evaluate the impact resistance and aging characteristics of the tested sample based on the recorded electrical performance parameter change data and surface temperature distribution data as well as the number of impacts the tested sample can withstand under multiple pulse impacts until the sample fails.

[0126] The electronic circuit design of the test platform provided in this embodiment can quickly capture and record the discharge pulse sequence, maintain high responsiveness even in high-frequency discharge conditions, and effectively capture each discharge event. By setting multiple voltage limiting devices on the platform and using a single-chip interrupt method, the platform can demonstrate stronger robustness and anti-interference capabilities when facing complex power system operating environments such as multiple lightning strikes.

[0127] Furthermore, due to the high reliability and robustness of the platform, it can also reduce the maintenance requirements at the test site, reduce the maintenance cost of the test platform, and improve the operating efficiency of the power system.

[0128] In this embodiment, specifically Figure 3 In the impulse current generator shown, C is the total capacitance of multiple capacitors connected in parallel; L is the total inductance of all devices; R is the total resistance of all devices; G is the spherical gap of ignition discharge; D is the silicon stack; O is the test end sample; T is the charging transformer; r is the protection resistor; CRO is the measuring oscilloscope; S is a shunt used to measure the sample current; C1 and C2 are voltage dividers used to measure the sample voltage.

[0129] In order to achieve a more detailed description of the above-mentioned impulse current generator, see Figure 4, Figure 4 The overall electrical schematic diagram of the multi-pulse impulse current generator provided by the present invention. Figure 4 As shown, since the multi-pulse lightning impulse test platform provided in this embodiment is preferably developed according to a maximum number of 20 pulses, therefore, see Figure 4 , where C is the capacitance of each circuit; G is the impact ignition gap of each circuit; Rs is the modulation resistance of each circuit; Ls is the modulation inductance of each circuit; EUT is the equipment under test; Ur is the voltage; Ip is the current.

[0130] Specific as Figure 4 As shown, the multi-pulse impulse current generator provided in this embodiment is based on the sample to be tested, that is, Figure 4 The end of the test equipment shown is an axis, and there are 10 trigger channels at both ends of the axis, each trigger channel is a waveform generator, so the overall multi-pulse impulse current generator provided in this embodiment is controlled by 20 independent discharge circuits. Among them, the circuit of each waveform generator can independently set its own pulse parameters, so the overall impulse circuit generator can realize the trigger discharge of 20 pulse currents, and the time interval between consecutive lightning strikes can be set arbitrarily to simulate natural lightning waveforms, and different types of waveforms can be output by changing the modulation resistor.

[0131] In addition, in order to obtain a large impulse current amplitude and steepness, the inductance of the impulse current generator discharge circuit is minimized as much as possible. When laying out the impulse current generator on the mechanical structure, this embodiment adopts a typical impulse discharge circuit, that is, the capacitor group is used as the common center, and the remaining devices are arranged in a fan shape around the common center to achieve the best discharge effect of all discharge circuits. In addition, since each discharge device can independently control the discharge timing, each discharge device can also be tested independently, and multiple lightning impulse currents can also be controlled to be output in parallel, which can output a higher amplitude.

[0132] In order to solve the simultaneous sequence control and multi-channel discharge technology required by the impact test method, the strength of the electronic control signal is generally 5V, and the signal threshold is generally around 2V, and the electromagnetic interference intensity caused to the platform is generally tens of volts / meter when working in a strong electromagnetic environment generated by a strong lightning discharge process. Therefore, how to realize the transmission and control of electronic control signals in a small space and realize reliable signal control in an extremely strong electromagnetic environment is the key to realizing pulse triggering of the test platform provided by this embodiment.

[0133] See also Figure 5 , Figure 5This is a device structure diagram of an embodiment of the trigger control system provided by the present invention. It can be seen that in response to the above problems, the key device of the trigger control system provided by this embodiment is a high-voltage ignition device, which is composed of a pulse controllable timer, a pulse polarity control, a pulse silicon stack trigger, a pulse spark plug, a lithium battery and a pulse booster. Among them, since the multi-pulse lightning impulse test platform provided by this embodiment is preferably developed according to a maximum number of 20 pulses, the pulse controllable timer, pulse polarity control, pulse silicon stack trigger, pulse spark plug and pulse booster provided by the ignition device all contain 20.

[0134] For the above-mentioned high-voltage ignition device, see Figure 5 First, the pulse controllable timer can generate 20 trigger pulses to trigger the spark plug ignition, and the time interval and trigger sequence between the 20 trigger pulses can be set arbitrarily through the timer. Among them, the trigger control system adopts electromagnetic compatibility design, isolated power supply, electrical signal transmission adopts photoelectric and optical fiber, communication mode is RS232, and can select working mode, output channel, delay time and angle, etc.

[0135] like Figure 5 As shown, the pulse polarity control is used to control the ignition polarity of the 20-way spark plugs; the lithium battery is used to power the pulse booster, and the pulse booster oscillates the direct current into alternating current according to the discharge frequency through the oscillation circuit therein, and boosts the oscillated alternating current to a high voltage that can ionize the air. The pulse silicon stack trigger triggers the silicon stack separately, and transmits the high voltage that can ionize the air through the booster to the spark plug through the output triggered current, and the pulse spark plug is placed in the upper ball of the discharge ball gap.

[0136] The specific control principle of the above ignition process can be found in Figure 6 , Figure 6 The pulse ignition control principle diagram of the trigger control system provided by the present invention. Figure 6 As shown, the test platform first sends a synchronous trigger or asynchronous trigger time command to the pulse controllable timer through the 232 communication protocol, so that the pulse controllable timer sends 20 pulse signals after photoelectric conversion, which are connected to the trigger box through an optical fiber line with a transmitter and a receiver. For the 20 pulse signals sent by the pulse controllable timer, this embodiment preferably provides four trigger boxes, wherein each trigger box has a total of 6 channels, 5 of the 6 channels control 5 spark plugs, and the other channel is used to control the ignition polarity of the 20 spark plugs.

[0137] When the trigger box receives the pulse signal from the pulse controllable timer, the pulse booster generates a high voltage, which starts to discharge after the discharge electrode breaks through a certain thickness of air, thereby completing a multi-pulse discharge ignition. The high-voltage multi-channel discharge trigger provided in this embodiment uses an extremely steep pulse generator, which outputs a high-voltage trigger signal with a rise time of hundreds of nanoseconds, which is used to trigger the discharge electrode. The trigger pulse is output by the controller according to the timing requirements, amplified by the pulse amplifier, and then triggers the discharge gap.

[0138] In this embodiment, according to the provisions of the IEC standard on lightning current waveform parameters, the error of the wavefront time, half-peak time and peak value of the pulse current generated by the impulse test is not allowed to exceed 10%, but a small oscillation with an amplitude within 5% of the exponential impulse current peak value is allowed. Therefore, the test platform provided in this embodiment preferably uses a typical 8 / 20μs (i.e., the wavefront time is 8μs, and the half-peak time is 20μs) waveform as a single pulse to simulate multiple lightning pulses. For details, see Figure 7 , Figure 7 The pulse lightning waveform diagram provided by the present invention. Figure 7 As shown in the standard impulse lightning current index waveform diagram, Tf is the wave front time and Tt is the half-wave peak time.

[0139] When a multi-pulse lightning impulse test example is performed through the multi-pulse lightning impulse test platform provided by this embodiment, the user first adjusts the charging voltage of the impulse current generator so that it can output the current amplitude required for the test, and then uses the multi-pulse lightning current to perform an impulse test on the preferred sample to be tested, namely the ZnO varistor. Among them, every 5 pulse currents are recorded as a group, and an impulse is performed, and the time interval between each two adjacent groups of impulses is 30min. This embodiment preferably sets this time interval to be sufficient to allow the ZnO varistor to cool to room temperature before the next impulse. Until the change amplitude of the static parameter varistor voltage exceeds the original ±10%, or the leakage current exceeds 20μA or the appearance is directly damaged, the ZnO varistor is judged to be failed, the impact experiment is stopped, and the relevant data is recorded, and then the impact tolerance and aging characteristics of the tested ZnO varistor are evaluated according to the recorded test data.

[0140] In order to better illustrate the working principle and step flow of a multi-pulse lightning impulse testing method and testing device of the present invention, it is possible but not limited to refer to the relevant records above.

[0141] In summary, the embodiments of the present invention provide a multi-pulse lightning impulse test method and test platform, the method comprising generating a continuous multi-pulse current according to the acquired target test parameters, and performing a multi-pulse lightning impulse test on the sample to be tested by the continuous multi-pulse current, and then obtaining the temperature distribution data and electrical performance parameter data of the sample to be tested, and generating the impact test result of the sample to be tested according to the temperature distribution data and the electrical performance parameter data. A multi-pulse lightning impulse test method disclosed in the present invention simulates the natural lightning waveform by continuous multi-pulse current, thereby improving the practicality and reliability of the impact test result; and through the change data of temperature data and the change data of electrical performance data, the thermal effect influence and multi-pulse current influence of the sample to be tested under the multi-pulse lightning impulse test are comprehensively considered, thereby improving the accuracy and comprehensiveness of the impact test result.

[0142] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-pulse lightning impulse test method, characterized in that: The following steps are involved: Obtaining samples to be tested and target test parameters; Generate a continuous multi-pulse current according to the target test parameter, and perform a multi-pulse lightning impulse test on the sample to be tested by using the continuous multi-pulse current; During the multi-pulse lightning impulse test, the temperature distribution data and the electrical performance parameter data of the sample to be tested are obtained, and the impulse test result of the sample to be tested is generated according to the temperature distribution data and the electrical performance parameter data.

2. A multi-pulse lightning impulse test method as claimed in claim 1, characterized in that: The target test parameters include a target test voltage, a target pulse number, a target pulse interval and a target pulse amplitude.

3. A multi-pulse lightning impulse test method as claimed in claim 2, characterized in that: The method of performing a multi-pulse lightning impulse test on the sample to be tested by using the continuous multi-pulse current comprises: Applying the continuous multi-pulse current to the sample to be tested according to the target pulse interval in the target test parameter; When the continuous multi-pulse current is applied, the pulse current of the continuous multi-pulse current is obtained to obtain a discharge pulse sequence.

4. A multi-pulse lightning impulse test method as claimed in claim 3, characterized in that: The step of generating the impact test result of the sample to be tested according to the temperature distribution data and the electrical performance parameter data comprises: Associating the discharge pulse sequence with the temperature distribution data and the electrical performance parameter data respectively to obtain a plurality of discharge sequence temperature data and a plurality of discharge sequence performance data; Correlation processing is performed on a plurality of the discharge sequence temperature data and the discharge sequence performance data to obtain a plurality of discharge event change data; An impact test is performed on the sample to be tested according to a plurality of the discharge event change data to obtain the impact test result.

5. A multi-pulse lightning impulse test method as claimed in claim 1, characterized in that: The method further comprises: generating a continuous multi-pulse current according to the target test parameter, and performing a multi-pulse lightning impulse test on the sample to be tested by using the continuous multi-pulse current. Acquire the test environment data of the sample to be tested, and compare the test environment data with preset standard environment data to obtain an environment comparison result; When the environmental comparison result is that the test environmental data meets the standard environmental data, a continuous multi-pulse current is generated according to the target test parameters, and a multi-pulse lightning impulse test is performed on the sample to be tested by the continuous multi-pulse current.

6. A multi-pulse lightning impulse test method as claimed in claim 5, characterized in that: The step of acquiring the test environment data of the sample to be tested, and comparing the test environment data with preset standard environment data to obtain an environment comparison result, further includes: When the environmental comparison result is that the test environmental data does not conform to the standard environmental data, an environmental alarm signal is triggered, and the generation of continuous multi-pulse current according to the target test parameters is suspended.

7. A multi-pulse lightning impulse test method as claimed in claim 1, characterized in that: The step of generating the impact test result of the sample to be tested according to the temperature distribution data and the electrical performance parameter data further includes: Associating the impact test result with the target test parameter to obtain impact test data, and storing the impact test data in a preset impact test database; Perform data trend analysis on the impact test data in the impact test database at preset time intervals to obtain and output a trend analysis report.

8. A multi-pulse lightning impulse test method as claimed in claim 1, characterized in that: The step of obtaining the sample to be tested and the target test parameters includes: Obtaining preset sample parameter data of the original sample, and comparing the sample parameter data with preset sample standard data to obtain a sample comparison result; When the sample comparison result is that the sample parameter data meets the sample standard data, the original sample is used as the sample to be tested, and the target test parameters are obtained.

9. A multi-pulse lightning impulse test device, characterized in that: The multi-pulse lightning impulse test device includes a central controller, a trigger control system, a discharge circuit and an infrared thermal imaging device; wherein: The central controller is used to execute a multi-pulse lightning impulse test method as described in any one of claims 1 to 8; The trigger control system is used to receive the target test parameters sent by the central controller, generate a pulse current trigger signal according to the target test parameters, and send the pulse current trigger signal to the discharge circuit; The discharge circuit is used to receive the pulse current trigger signal sent by the trigger control system, and generate corresponding continuous multi-pulse current according to the pulse current trigger signal; The infrared thermal imaging device is used to collect temperature distribution data of the sample to be tested during a multi-pulse lightning impulse test, and send the temperature distribution data to the central processing unit.

10. A multi-pulse lightning impulse test device as claimed in claim 9, characterized in that: The multi-pulse lightning impulse test device also includes a test equipment calibration system; wherein: The test equipment calibration system is used to obtain the test equipment data of the multi-pulse lightning impulse test device at preset time intervals, and feed the test equipment data back to the central processor so that the central processor compares the test equipment data with the pre-stored standard equipment data, and if the comparison result is that the test equipment data conforms to the standard equipment data, an equipment calibration report is generated according to the test equipment data for storage.

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