Electric energy meter withstand voltage test method and system combined with leakage current detection

Abstract

The invention discloses an electric energy meter withstand voltage test method and system combined with leakage current detection, and relates to the technical field of electric energy meter test.The method comprises the steps that an electric energy meter identification code is read, and a corresponding withstand voltage test scheme is matched; a voltage terminal, a current terminal and an auxiliary terminal which are connected with the electric energy meter to be tested are crimped to the test probe at one time, leakage current data are monitored in real time, and leakage current monitoring data are obtained; when the leakage current monitoring data reach a leakage current threshold value, triggering breakdown protection; and generating a monitoring leakage current-time curve, and constructing a withstand voltage test report. According to the invention, the technical problems of low automation degree, insufficient monitoring precision, and incapability of real-time protection and accurate evaluation of insulation life of the voltage withstanding test of the electric energy meter in the prior art are solved, and the technical effects of realizing automatic and accurate monitoring and protection of the voltage withstanding test of the electric energy meter and improving the test efficiency and accuracy are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy meter testing, in particular to an electric energy meter withstand voltage test method and system combined with leakage current detection. BACKGROUND

[0002] In the production and maintenance process of electric energy meters, withstand voltage test is an important link to ensure the insulation performance and safety. The existing electric energy meter withstand voltage test method usually has the problem of low automation degree, and it is difficult to automatically match the appropriate test scheme according to the type of electric energy meter, and the monitoring precision of leakage current is insufficient in the test process, which cannot reflect the insulation state of the electric energy meter in real time and accurately. At the same time, when the leakage current is abnormal, there is a lack of effective breakdown protection mechanism, which may cause damage to the electric energy meter and even cause safety accidents, and it is difficult to scientifically evaluate the insulation life of the electric energy meter based on the monitoring data after the test is completed, and it is difficult to provide reliable basis for equipment maintenance and replacement.

[0003] The existing technology has the technical problems of low automation degree of electric energy meter withstand voltage test, insufficient monitoring precision, inability to protect in real time, and inaccurate evaluation of insulation life. SUMMARY

[0004] The present application provides an electric energy meter withstand voltage test method and system combined with leakage current detection, which is used to solve the technical problems of low automation degree of electric energy meter withstand voltage test, insufficient monitoring precision, inability to protect in real time, and inaccurate evaluation of insulation life in the prior art.

[0005] In view of the above problems, the present application provides an electric energy meter withstand voltage test method and system combined with leakage current detection.

[0006] In a first aspect of the present application, an electric energy meter withstand voltage test method combined with leakage current detection is provided, which comprises: reading an electric energy meter identification code and matching a corresponding withstand voltage test scheme; connecting the voltage terminal, current terminal and auxiliary terminal of the electric energy meter to be tested to the test probe by one-time crimping, performing multi-site withstand voltage test based on the withstand voltage test scheme, monitoring leakage current data in real time, and obtaining leakage current monitoring data; when the leakage current monitoring data reaches a leakage current threshold, triggering breakdown protection and sending a warning information; generating a monitoring leakage current-time curve according to the leakage current monitoring data, and constructing a withstand voltage test report according to the monitoring leakage current-time curve, breakdown point voltage and electric energy meter identification code.

[0007] In a second aspect of the present application, an electric energy meter withstand voltage test system combined with leakage current detection is provided, which comprises: A withstand voltage test scheme matching module is used to read the electric energy meter identification code and match the corresponding withstand voltage test scheme; a leakage current monitoring data acquisition module is used to connect the voltage terminal, current terminal and auxiliary terminal of the electric energy meter to be tested to the test probe at one time, perform multi-position withstand voltage test based on the withstand voltage test scheme, monitor the leakage current data in real time, and obtain leakage current monitoring data; an early warning information sending module is used to trigger breakdown protection and send early warning information when the leakage current monitoring data reaches the leakage current threshold; a withstand voltage test report construction module is used to generate a monitoring leakage current-time curve based on the leakage current monitoring data, and construct a withstand voltage test report based on the monitoring leakage current-time curve, the breakdown point voltage, and the electric energy meter identification code.

[0008] One or more technical solutions provided in this application have at least the following technical effects or advantages: The withstand voltage test scheme matching module is used to read the identification code of the electric energy meter and match the corresponding withstand voltage test scheme. The leakage current monitoring data acquisition module is used to connect the voltage terminal, current terminal, and auxiliary terminal of the electric energy meter to be tested to the test probe at one time, perform multi-position withstand voltage test based on the withstand voltage test scheme, monitor the leakage current data in real time, and obtain leakage current monitoring data. The early warning information sending module is used to trigger breakdown protection and send early warning information when the leakage current monitoring data reaches the leakage current threshold. The withstand voltage test report construction module is used to generate a monitoring leakage current-time curve based on the leakage current monitoring data, and construct a withstand voltage test report based on the monitoring leakage current-time curve, the breakdown point voltage, and the electric energy meter identification code. The technical effect of realizing automated and precise monitoring and protection of the withstand voltage test of the electric energy meter and improving the test efficiency and accuracy is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 A schematic flow chart of a method for voltage withstand testing of an electric energy meter combined with leakage current detection provided in an embodiment of the present application; Figure 2 Schematic diagram of the structure of the electric energy meter voltage withstand test system combined with leakage current detection provided in an embodiment of the present application.

[0011] Description of the accompanying drawings: voltage withstand test scheme matching module 10, leakage current monitoring data acquisition module 20, early warning information sending module 30, voltage withstand test report building module 40. DETAILED DESCRIPTION

[0012] The application provides a power meter withstand voltage test method and system combined with leakage current detection, which is used to solve the technical problems of low automation degree, insufficient monitoring accuracy, inability to protect in real time and accurately evaluate insulation life in the prior art.

[0013] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0014] Embodiment one, as shown in the application provides a power meter withstand voltage test method combined with leakage current detection, which comprises: Figure 1 Step S100: reading the power meter identification code and matching the corresponding withstand voltage test scheme. Step S100: reading the power meter identification code and matching the corresponding withstand voltage test scheme.

[0015] Specifically, after reading the power meter identification code, the type of the power meter is identified according to the identification code, which covers single-phase intelligent power meters, three-phase power meters and the like. According to the identified type of the power meter, the corresponding test site (such as line-to-line test or ground test), test voltage value and leakage current threshold value (including single-meter leakage current threshold value and total leakage current threshold value) are automatically matched, thereby obtaining a withstand voltage test scheme suitable for the power meter, and providing accurate execution basis for subsequent multi-site withstand voltage test and leakage current monitoring.

[0016] Step S200: connecting the voltage terminal, current terminal and auxiliary terminal of the power meter to be tested to the test probe by one-time crimping, performing multi-site withstand voltage test based on the withstand voltage test scheme, monitoring leakage current data in real time, and obtaining leakage current monitoring data.

[0017] Specifically, the voltage terminal, current terminal and auxiliary terminal of the power meter to be tested are connected to the test probe by one-time crimping to form a stable electrical connection. Based on the matched withstand voltage test scheme, if the test site is line-to-line test, an alternating high voltage is applied between the voltage line and the current line; if it is ground test, all lines are connected in parallel and an alternating high voltage is applied to the ground. During the test, the leakage current values of each site are collected at a preset sampling frequency, the single-site monitoring leakage current data is first constructed, and then all site data is superimposed to obtain the overall monitoring leakage current data. At the same time, a double-range switching mode (including high-precision mode and wide-range mode) is configured, when the monitoring leakage current data reaches the switching activation threshold value, the switching threshold value range is adjusted through the hysteresis comparison interval, the circuit signal path is kept during the switching period to ensure that the leakage current monitoring is not interrupted, and finally the complete leakage current monitoring data is obtained.

[0018] Step S300: when the leakage current monitoring data reaches the leakage current threshold, triggering the breakdown protection, sending the early warning information.

[0019] Specifically, the acquired leakage current monitoring data is compared with the preset threshold in real time, when the single-table-site monitoring leakage current data exceeds the single-table leakage current threshold, the corresponding single-table-site high voltage is automatically cut off and the early warning information is sent, and the other table-site test continues; if the overall table-site monitoring leakage current data exceeds the leakage current total threshold, the test of all table-sites is immediately stopped and the early warning information is sent, the breakdown protection is triggered through the above hierarchical protection mechanism, so as to ensure that the dangerous test process is interrupted in time when the insulation performance of the electric energy meter is abnormal, and the equipment is prevented from being damaged due to overvoltage breakdown.

[0020] Step S400: generating a monitoring leakage current-time curve according to the leakage current monitoring data, and constructing a withstand voltage test report according to the monitoring leakage current-time curve, the breakdown point voltage and the electric energy meter identification code.

[0021] Specifically, the monitoring leakage current-time curve reflecting the trend of leakage current change with time is generated according to the leakage current monitoring data, the leakage current steady-state value and the leakage current fluctuation variance are extracted therefrom, the insulation residual life percentage of the electric energy meter is calculated by algorithm and the life grade is marked; meanwhile, the breakdown point voltage value and the electric energy meter identification code are combined, the above data and the curve are integrated, and the withstand voltage test report containing the leakage current dynamic characteristics, the breakdown parameters, the equipment identification and the life prediction results is constructed, so as to provide systematic data support for the insulation performance evaluation and life prediction of the electric energy meter.

[0022] In one possible implementation manner, step S100 further includes: Step S110: identifying the electric energy meter type according to the electric energy meter identification code, the electric energy meter type including single-phase intelligent electric energy meter and three-phase electric energy meter.

[0023] Step S120: automatically matching the test site, the test voltage value and the leakage current threshold according to the electric energy meter type, to obtain the withstand voltage test scheme.

[0024] Specifically, after reading the electric energy meter identification code, the information contained in the identification code is analyzed, and the electric energy meter type is identified therefrom, the type including single-phase intelligent electric energy meter, three-phase electric energy meter and the like, which lays a foundation for automatically matching the withstand voltage test scheme such as the test site, the test voltage value and the leakage current threshold according to the electric energy meter type.

[0025] According to the identified type of electric energy meter, the corresponding test site, test voltage value and leakage current threshold are automatically matched according to the preset rule to generate a withstand voltage test scheme. If it is a single-phase intelligent electric energy meter, the withstand voltage test of “voltage line→current line” is automatically performed, 2kV voltage is applied and lasts for 60 seconds; if it is a three-phase high-end electric energy meter, the withstand voltage test of “all lines→ground” is performed, 4kV voltage is applied and the leakage current threshold is set to 20mA. Through the automatic matching of type and test parameters, the accuracy and adaptability of the test scheme are ensured.

[0026] In a possible implementation manner, step S200 further includes: Step S210: When the test site is inter-line test, an alternating high voltage is applied between the voltage line and the current line.

[0027] Step S220: When the test site is ground test, an alternating high voltage is applied to the ground after parallel connection of all lines.

[0028] Specifically, when the test site matched according to the type of electric energy meter is inter-line test (such as the “voltage line→current line” test scenario corresponding to the single-phase intelligent electric energy meter), an alternating high voltage (for example, 2kV voltage is applied when the single-phase intelligent electric energy meter is tested) meeting the requirements of the withstand voltage test scheme is applied between the voltage line and the current line of the electric energy meter through the test probe, so as to detect the insulation performance between the lines. The leakage current data is monitored in real time within the continuous test duration (such as 60s) to determine whether there is a risk of insulation breakdown between the lines.

[0029] When the test site is ground test (such as the “all lines→ground” test scenario corresponding to the three-phase high-end electric energy meter), all lines of the electric energy meter such as the voltage line, the current line and the auxiliary terminal are first connected in parallel. An alternating high voltage (for example, 4kV voltage is applied when the three-phase high-end electric energy meter is tested) meeting the requirements of the withstand voltage test scheme is applied between the whole parallel-connected lines and the ground through the test probe. The leakage current data (the leakage current threshold is preset to 20mA) is monitored in real time during the test to detect the insulation performance between the lines and the ground of the electric energy meter and determine whether there is a risk of ground breakdown.

[0030] In a possible implementation manner, step S200 further includes: Step S230: The leakage current value of each meter site is collected according to the preset sampling frequency.

[0031] Step S240: Based on the leakage current value of each meter site, the monitoring leakage current data of a single meter site is constructed.

[0032] Step S250: According to the monitoring leakage current data of a single meter site, all meter sites are superimposed to obtain the monitoring leakage current data of the whole meter site.

[0033] Specifically, during the voltage withstand test execution, the leakage current value of each meter position is periodically collected in real time according to a preset sampling frequency (which is determined according to the test standard and the type of the electric energy meter to ensure the real-time and accuracy of data collection), and the dynamic change data of the leakage current of each meter position during the voltage withstand test is obtained through high-frequency data sampling, thereby providing basic information for subsequent construction of the monitoring leakage current data of the single meter position and the overall meter position.

[0034] After obtaining the leakage current value of each meter position, the leakage current values of the same meter position at different sampling times are integrated in chronological order to form a leakage current data sequence of the meter position during the voltage withstand test, thereby constructing the monitoring leakage current data of the single meter position and recording the change of the leakage current of the meter position over time during the test, which provides accurate data support for single meter position leakage current threshold comparison and single meter position breakdown protection.

[0035] After the construction of the monitoring leakage current data of each single meter position is completed, the leakage current data of all meter positions is subjected to real-time superposition processing, the leakage current values of each meter position at the same time are added to form an overall leakage current data sequence reflecting the test state of multiple meter positions, thereby obtaining the monitoring leakage current data of the overall meter position. The data can be used to judge the overall insulation state of multiple meter positions during the test, and when the overall leakage current data exceeds the preset total leakage current threshold, the test of all meter positions is stopped and a warning protection mechanism is triggered to ensure the safety and test accuracy in the multiple meter position test scenario.

[0036] In one possible implementation, step S300 further includes: Step S310: When the monitoring leakage current data of the single meter position exceeds the single meter leakage current threshold, the high voltage of the corresponding single meter position is cut off and a warning information is sent, and the other meter positions continue to be tested.

[0037] Step S320: When the monitoring leakage current data of the overall meter position exceeds the total leakage current threshold, the test of all meter positions is stopped and a warning information is sent.

[0038] Specifically, during the voltage withstand test, the monitoring leakage current data of each single meter position is compared with the preset single meter leakage current threshold in real time, and if the leakage current data of a single meter position exceeds the corresponding single meter leakage current threshold, it indicates that the meter position may have an insulation breakdown risk. At this time, the high voltage output of the single meter position is automatically cut off, and a warning information is sent to prompt the abnormal meter position, while the test of other meter positions continues, thereby ensuring the continuity and efficiency of the test of other meter positions while ensuring the timely protection of the abnormal meter position.

[0039] During the voltage withstand test, the monitoring leakage current data of the overall epitope is continuously monitored. When the data exceeds the preset leakage current threshold, it indicates that the total leakage current of all epitopes has reached a dangerous critical value, and there may be a failure of the overall insulation performance or a serious abnormal situation. At this time, the operation of stopping all epitope tests will be immediately performed, and a pre-warning mechanism is triggered to send a pre-warning information. The breakdown protection is implemented by urgently cutting off all test high-voltage outputs to avoid the batch breakdown damage of the electric energy meter or the safety accident caused by the abnormal overall leakage current, thereby ensuring the safety of the test environment and equipment.

[0040] In one possible implementation manner, step S200 further includes: Step S260: configuring a dual-range switching mode, wherein the dual-range switching mode includes a high-precision mode and a wide-range mode, and a hysteresis comparison interval is set during switching of the high-precision mode and the wide-range mode, and the hysteresis comparison interval is used to adjust the switching threshold range according to the hysteresis amount when switching for the first time.

[0041] Step S270: when the monitoring leakage current data reaches a switching activation threshold, switching between the high-precision mode and the wide-range mode is performed.

[0042] Step S280: wherein the leakage current monitoring is not interrupted during switching by keeping the circuit signal path.

[0043] Specifically, a dual-range switching mode including a high-precision mode and a wide-range mode is configured. The high-precision mode is activated when the leakage current value is less than 10 mA, a 24-bit sigma-delta analog-to-digital converter (such as AD7124) is used, a transimpedance amplifier and an active shield driving circuit are matched, the measurement error is ≤±(1% reading+0.01 mA), and the operational amplifier bias voltage is eliminated through an automatic zeroing circuit with a zeroing frequency of ≥10 Hz; the wide-range mode is activated when the leakage current value is ≥10 mA, a 16-bit successive approximation SAR ADC (such as ADS8860) is used, a programmable gain amplifier and a TVS overvoltage protection circuit are matched, the measurement error is ≤±(3% reading+0.1 mA), and a segmented non-linear calibration function is used when 10 mA≤I<30 mA and 30 mA≤I≤50 mA, respectively. At the same time, a hysteresis comparison interval of 8 mA to 12 mA is set during switching between the two modes, which is used to adjust the switching threshold range according to the hysteresis amount when switching for the first time. When the monitoring leakage current data reaches the switching activation threshold, switching between the high-precision mode and the wide-range mode is performed. If the leakage current is ≥12 mA for the first time, the high-precision mode is switched to the wide-range mode; only when the leakage current falls to ≤8 mA, the high-precision mode is switched back. During the switching process, the hysteresis comparison interval (8 mA to 12 mA) is used to avoid frequent switching caused by small fluctuations in the leakage current, thereby ensuring the stability and reliability of the switching logic.

[0044] During the switching process between the high-precision mode and the wide-range mode, the signal path of the holding circuit is kept continuously on through special design, ensuring that the leakage current monitoring process is uninterrupted. The entire switching action is completed within 20 ms, during which real-time sampling of leakage current data and transmission are performed, ensuring the continuity and integrity of the monitoring data and providing reliable data support for subsequent analysis.

[0045] In one possible implementation, step S400 further includes: Step S410: Extracting a leakage current steady-state value and a leakage current fluctuation variance from the monitored leakage current-time curve.

[0046] Step S420: Life prediction is performed on the electric energy meter according to the leakage current steady-state value and the leakage current fluctuation variance, and a percentage of remaining insulation life is obtained.

[0047] Step S430: Life grade labeling is performed according to the percentage of remaining insulation life, and the labeling is added to the withstand voltage test report.

[0048] Specifically, the generated monitored leakage current-time curve is analyzed to extract a leakage current steady-state value and a leakage current fluctuation variance. The leakage current steady-state value refers to a relatively stable value of the leakage current after the test process enters the stable stage, which reflects the leakage current level of the insulation system of the electric energy meter in the stable state. The leakage current fluctuation variance is used to measure the fluctuation degree of the leakage current around the mean value in the stable state, and reflects the stability and dispersion of the leakage current. By extracting these two parameters, key data support is provided for subsequent evaluation of the insulation performance and life prediction of the electric energy meter.

[0049] A mathematical model of the leakage current parameters and the insulation aging degree is established. The leakage current steady-state value is substituted into the Arrhenius equation to calculate the aging rate of the insulation material. The expansion probability of insulation defects is analyzed through the Weibull distribution model combined with the leakage current fluctuation variance. Then, the historical test data is trained using a neural network algorithm to build a mapping relationship between the leakage current parameters and the remaining life. Finally, the percentage of remaining insulation life is output, for example, when the leakage current steady-state value is 5 mA and the fluctuation variance is 0.2, the model calculates that the percentage of remaining insulation life is 85%.

[0050] According to the calculated percentage of remaining insulation life, the insulation life state of the electric energy meter is labeled according to the pre-set life grade division standard, for example, the percentage of remaining life ≥ 80% is labeled as “first level (good)”, 50% ~ 79% is labeled as “second level (general)”, and < 50% is labeled as “third level (warning)”. The life grade information is embedded in the specified position of the withstand voltage test report, so that the test report not only contains basic information such as leakage current monitoring data and breakdown point voltage, but also intuitively presents the remaining life state of the insulation system of the electric energy meter, providing clear reference for subsequent equipment maintenance and replacement decisions.

[0051] Embodiment two, based on the same inventive concept as the power meter withstand voltage test method combined with leakage current detection in the foregoing embodiments, as shown in the present application, a power meter withstand voltage test system combined with leakage current detection is provided, and the system and method embodiments in the present application are based on the same inventive concept. Among them, the system comprises: Figure 2 A withstand voltage test scheme matching module 10 is configured to read the power meter identification code and match the corresponding withstand voltage test scheme.

[0052] A leakage current monitoring data acquisition module 20 is configured to connect the voltage terminal, current terminal and auxiliary terminal of the power meter to be tested to the test probe by one-time crimping, perform multi-site withstand voltage test based on the withstand voltage test scheme, monitor leakage current data in real time, and obtain leakage current monitoring data.

[0053] A warning information sending module 30 is configured to trigger breakdown protection and send warning information when the leakage current monitoring data reaches the leakage current threshold.

[0054] A withstand voltage test report construction module 40 is configured to generate a monitoring leakage current-time curve according to the leakage current monitoring data, and construct a withstand voltage test report according to the monitoring leakage current-time curve, breakdown point voltage and power meter identification code.

[0055] Further, the system is also used to realize the following functions: According to the power meter identification code, the type of the power meter is identified, and the type of the power meter includes a single-phase intelligent power meter and a three-phase power meter; according to the type of the power meter, the test site, test voltage value and leakage current threshold are automatically matched to obtain the withstand voltage test scheme.

[0056] Further, the system is also used to realize the following functions: When the test site is a line-to-line test, an alternating high voltage is applied between the voltage line and the current line; when the test site is a ground test, an alternating high voltage is applied to the ground after all lines are connected in parallel.

[0057] Further, the system is also used to realize the following functions: According to a preset sampling frequency, the leakage current value of each table site is collected; based on the leakage current value of each table site, the monitoring leakage current data of a single table site is constructed; and according to the monitoring leakage current data of a single table site, all table sites are superimposed to obtain the monitoring leakage current data of the overall table site.

[0058] Further, the system is also used to realize the following functions: ​When the monitoring leakage current data of the single epitope exceeds the single epitope leakage current threshold, the corresponding single epitope high voltage is cut off and a warning information is sent, and other epitopes continue to be tested; when the monitoring leakage current data of the whole epitope exceeds the total leakage current threshold, the testing of all epitopes is stopped and a warning information is sent.

[0059] Further, the system is also used to realize the following functions: A dual-range switching mode is configured, wherein the dual-range switching mode includes a high-precision mode and a wide-range mode, a hysteresis comparison interval is set during switching of the high-precision mode and the wide-range mode, the hysteresis comparison interval is used to adjust the switching threshold range according to the hysteresis amount when switching for the first time; when the monitoring leakage current data reaches a switching activation threshold, mode switching is performed in the high-precision mode and the wide-range mode; wherein the circuit signal path is maintained during switching, and the leakage current monitoring is not interrupted.

[0060] Further, the system is also used to realize the following functions: The leakage current steady-state value and the leakage current fluctuation variance are extracted according to the monitoring leakage current-time curve; the service life of the electric energy meter is predicted according to the leakage current steady-state value and the leakage current fluctuation variance, and the insulation remaining life percentage is obtained; the service life grade is labeled according to the insulation remaining life percentage, and is added to the withstand voltage test report.

[0061] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. And the above describes a specific embodiment of the present application. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are possible or can be advantageous.

[0062] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0063] The present application is only an exemplary description of the present application, and is considered to cover any and all modifications, changes, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art can make various modifications and changes to the present application without departing from the scope of the present application. Thus, if these modifications and changes of the present application belong to the scope of the present application and its equivalents, the present application intends to include these modifications and changes.

Claims

1. The method for testing the withstand voltage of an electric energy meter in combination with leakage current detection is characterized in that: include: Read the identification code of the electric energy meter and match the corresponding withstand voltage test solution; Connect the voltage terminal, current terminal, and auxiliary terminal of the electric energy meter to be tested to the test probe at one time, perform a multi-position withstand voltage test based on the withstand voltage test scheme, monitor the leakage current data in real time, and obtain leakage current monitoring data; When the leakage current monitoring data reaches the leakage current threshold, the breakdown protection is triggered and an early warning message is sent; A monitoring leakage current-time curve is generated according to the leakage current monitoring data, and a withstand voltage test report is constructed according to the monitoring leakage current-time curve, the breakdown point voltage, and the electric energy meter identification code.

2. The method for withstand voltage testing of electric energy meters combined with leakage current detection according to claim 1, characterized in that: Read the energy meter identification code and match the corresponding voltage withstand test solution, including: Identify the type of the electric energy meter according to the electric energy meter identification code, where the electric energy meter type includes a single-phase smart electric energy meter and a three-phase electric energy meter; According to the type of the electric energy meter, the test location, test voltage value, and leakage current threshold are automatically matched to obtain a withstand voltage test plan.

3. The method for withstand voltage testing of electric energy meters combined with leakage current detection according to claim 2, characterized in that: Performing a multi-site withstand voltage test based on the withstand voltage test scheme includes: When the test location is inter-circuit testing, AC high voltage is applied between the voltage circuit and the current circuit; When the test location is to the ground, connect all the lines in parallel and apply AC high voltage to the ground.

4. The method for withstand voltage testing of electric energy meters combined with leakage current detection according to claim 2, characterized in that: Based on the withstand voltage test scheme, pressure is applied to multiple locations and leakage current data is monitored in real time, including: Collect the leakage current value of each epitope according to the preset sampling frequency; Based on the leakage current value of each epitope, the monitoring leakage current data of the single epitope is constructed; Based on the monitoring leakage current data of a single epitope, all epitopes were superimposed to obtain the monitoring leakage current data of the overall epitope.

5. The method for withstand voltage testing of electric energy meters combined with leakage current detection according to claim 4, characterized in that: Send early warning information, including: When the monitoring leakage current data of the single epitope exceeds the single-element leakage current threshold, the corresponding single epitope high voltage is cut off and an early warning message is sent, and other epitopes continue to be tested; When the monitored leakage current data of the entire epitope exceeds the total leakage current threshold, all epitope tests are stopped and an early warning message is sent.

6. The method for withstand voltage testing of electric energy meters combined with leakage current detection according to claim 1, characterized in that: Real-time monitoring of leakage current data, including: Configuring a dual-range switching mode, wherein the dual-range switching mode includes a high-precision mode and a wide-range mode. A hysteresis comparison interval is set during switching between the high-precision mode and the wide-range mode. The hysteresis comparison interval is used to adjust the switching threshold range according to the hysteresis amount during the first switching; When the monitored leakage current data reaches a switching activation threshold, performing mode switching between the high-precision mode and the wide-range mode; The circuit signal path is maintained during the switching period, and the leakage current monitoring is not interrupted.

7. The method for withstand voltage testing of electric energy meters combined with leakage current detection according to claim 1, characterized in that: The construction of the voltage test report also includes: Extract the steady-state value of leakage current and leakage current fluctuation variance based on the monitored leakage current-time curve; The life of the electric energy meter is predicted based on the steady-state value of the leakage current and the leakage current fluctuation variance to obtain the percentage of the remaining insulation life; The life grade is marked according to the percentage of the remaining insulation life and added to the withstand voltage test report.

8. The electric energy meter withstand voltage test system combined with leakage current detection is characterized by: The system is used to implement the electric energy meter withstand voltage test method combined with leakage current detection according to any one of claims 1 to 7, and the system includes: The withstand voltage test scheme matching module is used to read the identification code of the electric energy meter and match the corresponding withstand voltage test scheme; A leakage current monitoring data acquisition module is used to connect the voltage terminal, current terminal, and auxiliary terminal of the electric energy meter to be tested to the test probe at one time, perform a multi-position withstand voltage test based on the withstand voltage test scheme, monitor the leakage current data in real time, and obtain leakage current monitoring data; An early warning information sending module is used to trigger breakdown protection and send early warning information when the leakage current monitoring data reaches a leakage current threshold; The withstand voltage test report construction module is used to generate a monitoring leakage current-time curve according to the leakage current monitoring data, and to construct a withstand voltage test report according to the monitoring leakage current-time curve, the breakdown point voltage, and the electric energy meter identification code.

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