A method for testing the performance of a leakage protection device

Abstract

The present invention discloses a method for testing the service performance of a leakage protection device. The method for testing the service performance of the leakage protection device includes the following steps: obtaining the environmental factor level; obtaining the environmental factor influence coefficient; checking and connecting the device; setting the leakage current parameter; obtaining the sensitivity coefficient; and obtaining the service performance index. The present invention analyzes the environmental factors of the service performance test to obtain the environmental factor level, obtains the environmental factor influence coefficient according to the environmental factor level, then checks and connects the test device, then sets the leakage current parameter and obtains the sensitivity coefficient according to the leakage action time obtained during the test, and finally obtains the service performance index according to the environmental factor influence coefficient, the sensitivity coefficient and the leakage action time, achieving an improvement in the relevance between the service performance test result and the environment, and solving the problem of low relevance between the service performance test result and the environment in the prior art.

Description

[0001] This application is a divisional application of the application filed on July 17, 2024, with application number 202410956772.6 and invention name “A method for testing the performance of a leakage protection device”. Technical Field

[0002] The invention relates to the field of measuring electric variables, and in particular to a method for testing the performance of a leakage protection device. Background Art

[0003] With the rapid development of electrical equipment, safety issues such as electrical failure, leakage and short circuit have gradually appeared in the public's field of vision. In order to improve the safety performance of electrical equipment and protect users from electrical accidents, leakage protection devices have come into being. In the leakage protection device, the detection unit is the core part of the leakage protection device, which is responsible for monitoring the current in the circuit, especially the leakage current. With the increasing attention paid to electrical safety and personal safety, countries have begun to formulate relevant laws and regulations and standards, requiring electrical equipment to have sufficient safety features. Among them, testing and evaluating the performance of leakage protection devices has become an important task. Excellent performance testing can not only ensure the performance of leakage protection devices in actual use, but also effectively protect the safety of users' lives and property. Therefore, it is of great significance to study a performance testing method for leakage protection devices.

[0004] Existing performance tests are generally considered from the perspectives of detecting leakage current, testing action time and testing voltage. Among them, leakage current is detected through fault detection technologies such as differential current detection, zero-sequence current detection and fundamental frequency current change; leakage conditions are simulated through current injection devices, and the time it takes for the leakage protection device to cut off the circuit is tested to achieve the test action time; the insulation performance of the leakage protection device under rated voltage and whether it can work normally are tested through voltage withstand test technology; and the rated current and rated voltage test technology are used to verify whether the rated current and rated voltage of the leakage protection device meet the requirements.

[0005] For example, the invention patent with announcement number: CN106324349B announces an electrical resistance performance testing method and system, including: determining a printed circuit board to be tested, and deploying a corresponding conductive stack signal line for each conductive stack in the printed circuit board to be tested, then setting at least one via for the printed circuit board to be tested, and then deploying a corresponding via signal line for each via on the printed circuit board to be tested, and finally testing the resistance value between each conductive stack and the via through the conductive stack signal line and the via signal line.

[0006] For example, a leakage protector and a leakage protection function detection method disclosed in the invention patent announcement with the announcement number CN104422830B include: periodically determining whether the current timing time reaches a predetermined time length; automatically simulating and generating a leakage current in the power grid when it is determined that the current timing time reaches the predetermined time length; measuring the leakage current in the power grid and determining whether the leakage current in the power grid is greater than a predetermined leakage current threshold; and outputting a leakage protection function failure signal or outputting a breaker trip control signal when a leakage current is simulated and generated in the power grid and it is determined that the leakage current in the power grid is not greater than the predetermined leakage current threshold.

[0007] However, in the process of implementing the technical solution of the invention in the embodiments of the present application, it is found that the above technology has at least the following technical problems:

[0008] In the prior art, only the use performance test is considered in a specific test environment, without considering that too high temperature will cause component aging and performance degradation of the leakage protection device, thus affecting the sensitivity and reliability of the leakage protection device; in a humid environment, the insulation of the leakage protection device is unstable, resulting in misoperation or even failure to trigger the leakage action, and there is a problem of low correlation between the use performance test result and the environment. Summary of the Invention

[0009] The embodiments of the present application provide a method for testing the use performance of a leakage protection device, which solves the problem of low correlation between the use performance test result and the environment, and realizes the improvement of the correlation between the use performance test result and the environment.

[0010] The embodiments of the present application provide a method for testing the use performance of a leakage protection device, including the following steps: S1, analyzing the environmental factors for testing the use performance of the leakage protection device according to the actual use scenario of the leakage protection device to obtain an environmental factor level, where the environmental factor level includes a temperature level and a humidity level; S2, obtaining an environmental factor influence coefficient according to the environmental factor level, where the environmental factor influence coefficient represents the influence degree of the environmental factor on the use performance of the leakage protection device; S3, inspecting the leakage protection device and connecting an ammeter and an oscilloscope to the leakage protection device according to a preset connection method; S4, setting a leakage current parameter according to the electrical safety standard followed by the leakage protection device and the environmental factor influence coefficient; S5, injecting a simulated leakage current into the leakage protection device and recording the corresponding leakage action time, and obtaining a sensitivity coefficient of the leakage protection device therefrom, where the sensitivity coefficient represents the sensitive degree of the leakage protection device; S6, obtaining a use performance index of the leakage protection device according to the environmental factor influence coefficient, the sensitivity coefficient and the leakage action time, and giving a warning about the use performance of the leakage protection device according to the use performance index of the leakage protection device, where the use performance index is used to describe the safety degree of the leakage protection device in actual use.

[0011] Further, the specific method for obtaining the environmental factor influence coefficient is as follows: Number the performance tests, and analyze the environmental factors during the performance tests to obtain the corresponding temperature grade and humidity grade; Obtain the initial temperature value and initial humidity value of the leakage protection device during the performance test through a temperature and humidity sensor, perform normalization processing to obtain the corresponding temperature value and humidity value, and obtain the environmental factor influence coefficient in combination with the obtained temperature grade and humidity grade.

[0012] Further, the specific process for obtaining the sensitivity coefficient of the leakage protection device is as follows: Inject a simulated leakage current into the leakage protection device and adjust the initial simulated leakage current through a current source to convert the initial simulated leakage current into a test simulated current; Obtain the leakage action time according to the time information of the simulated leakage current recorded by the oscilloscope, and obtain the corresponding sensitivity coefficient in combination with the leakage current amplitude in the leakage protection device.

[0013] Further, the sensitivity coefficient of the leakage protection device is calculated using the following formula:

[0014]

[0015] where, LM d is the sensitivity coefficient of the leakage protection device in the d-th performance test, d is the numbering of the performance test, d = 1, 2, 3,..., D, D is the total number of performance tests, f d.e is the ending amplitude of the leakage protection device in the d-th performance test, f d.o is the starting amplitude of the leakage protection device in the d-th performance test, T d.e is the ending time node of the leakage protection device in the d-th performance test, T d.o is the starting time node of the leakage protection device in the d-th performance test, a d is the temperature grade of the leakage protection device in the d-th performance test, b d is the humidity grade of the leakage protection device in the d-th performance test, and e represents the natural constant.

[0016] Further, the performance index of the leakage protection device is calculated using the following formula:

[0017] XN=(e - 2) S *log2(1 + H * L);

[0018] Wherein, XN is the performance index of the leakage protection device, S is the average value of the first leakage action time when testing the performance of the leakage protection device, H is the average change amount of the environmental factor influence coefficient when testing the performance of the leakage protection device, L is the average value of the sensitivity coefficient when testing the performance of the leakage protection device, and e represents the natural constant.

[0019] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0020] 1. By analyzing the environmental factors in the performance test to obtain the environmental factor level, then obtaining the environmental factor influence coefficient according to the environmental factor level, then checking and connecting the test device, setting the leakage current parameter and conducting the test, obtaining the sensitivity coefficient according to the leakage action time obtained during the test, and finally obtaining the performance index according to the environmental factor influence coefficient, sensitivity coefficient and leakage action time, thereby realizing the association between the performance test result and the environment, and further realizing the improvement of the relevance between the performance test result and the environment, effectively solving the problem of low relevance between the performance test result and the environment in the prior art.

[0021] 2. Connect the current source to the leakage protection device according to the preset connection method, then start the current source to inject simulated leakage current into the leakage protection device and adjust the current source to set the magnitude of the corresponding simulated leakage current, and finally use an ammeter and an oscilloscope to measure the simulated leakage current in the leakage protection device and record the corresponding simulated leakage current amplitude and time information, thereby realizing the injection of different simulated leakage currents into the leakage protection device, and further realizing the diversity of the performance test environment of the leakage protection device.

[0022] 3. Obtain the leakage action waveform interval from the current waveform of the simulated leakage current obtained by the oscilloscope, then obtain the start amplitude and end amplitude according to the leakage action waveform interval, and finally obtain the time node of the leakage action waveform interval through the time scale on the oscilloscope, and obtain the leakage action time according to the difference of the time nodes of the leakage action waveform interval, thereby realizing the accurate acquisition of the leakage action time, and further realizing the improvement of the accuracy of the performance test result of the leakage protection device. Description of the Drawings

[0023] Figure 1 It is a flowchart of a method for testing the performance of a leakage protection device provided by an embodiment of the present application;

[0024] Figure 2 It is a flowchart of injecting simulated leakage current provided by an embodiment of the present application;

[0025] Figure 3 It is a flowchart of obtaining the leakage action time provided by an embodiment of the present application;

[0026] Figure 4 It is a graph showing the change of the service performance index provided by the embodiments of the present application. Specific embodiments

[0027] By providing a method for testing the service performance of a leakage protection device, the embodiments of the present application solve the problem that the correlation between the service performance test result and the environment in the prior art is low. The environmental factors affecting the service performance of the leakage protection device are analyzed through the actual use scenario of the leakage protection device to obtain the environmental factor level, and the environmental factor influence coefficient is obtained according to the environmental factor level. Then, the leakage protection device is inspected and the ammeter and oscilloscope are connected to the leakage protection device according to the preset connection method. Next, the leakage current parameter is set according to the electrical safety standard followed by the leakage protection device and the environmental factor influence coefficient, and a simulated leakage current is injected into the leakage protection device and the corresponding leakage action time is recorded. Based on this, the sensitivity coefficient of the leakage protection device is obtained. Finally, the service performance index of the leakage protection device is obtained according to the environmental factor influence coefficient, the sensitivity coefficient and the leakage action time, and the service performance of the leakage protection device is warned according to the service performance index of the leakage protection device, realizing the improvement of the correlation between the service performance test result and the environment.

[0028] The technical solution in the embodiments of the present application for solving the problem of low correlation between the service performance test result and the environment is generally as follows:

[0029] The environmental factor level is obtained by analyzing the environmental factors of the service performance test, and then the environmental factor influence coefficient is obtained according to the environmental factor level. Then, the test device is inspected and connected, the leakage current parameter is set, and the sensitivity coefficient is obtained based on the leakage action time obtained during the test. Finally, the service performance index is obtained according to the environmental factor influence coefficient, the sensitivity coefficient and the leakage action time, achieving the effect of improving the correlation between the service performance test result and the environment.

[0030] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0031] As Figure 1As shown in the figure, it is a flowchart of a method for testing the performance of a leakage protection device provided by an embodiment of the present application. The method includes the following steps: S1. Obtain the environmental factor level: Analyze the environmental factors for testing the performance of the leakage protection device according to the actual usage scenario of the leakage protection device to obtain the environmental factor level. The environmental factor level includes a temperature level and a humidity level. The temperature level represents the corresponding range of temperature when testing the performance of the leakage protection device, and the humidity level represents the corresponding range of humidity when testing the performance of the leakage protection device; S2. Obtain the environmental factor influence coefficient: Obtain the environmental factor influence coefficient according to the environmental factor level. The environmental factor influence coefficient represents the degree of influence of environmental factors on the performance of the leakage protection device. The environmental factors include temperature and humidity; S3. Inspect and connect the device: Inspect the leakage protection device and connect the ammeter and oscilloscope to the leakage protection device according to the preset connection method; S4. Set the leakage current parameter: Set the leakage current parameter according to the electrical safety standard followed by the leakage protection device and the environmental factor influence coefficient. The leakage current parameter represents the maximum leakage current passing through the leakage protection device before the leakage protection device operates. The operation of the leakage protection device is that the leakage protection device disconnects the circuit; S5. Obtain the sensitivity coefficient: Inject a simulated leakage current into the leakage protection device and record the corresponding leakage operation time, and thus obtain the sensitivity coefficient of the leakage protection device. The simulated leakage current includes an initial simulated leakage current and a test simulated leakage current. The leakage operation time represents the time from when the leakage current reaches the leakage current parameter to when the leakage protection device disconnects the circuit. The sensitivity coefficient represents the sensitivity of the leakage protection device; S6. Obtain the performance index: Obtain the performance index of the leakage protection device according to the environmental factor influence coefficient, the sensitivity coefficient, and the leakage operation time, and give an early warning of the performance of the leakage protection device according to the performance index of the leakage protection device. The performance index is used to describe the safety level of the leakage protection device in actual use.

[0032] In this embodiment, the actual usage scenario of the leakage protection device includes the usage occasion and the special natural environment of use. Specifically, the usage occasion includes residential buildings, commercial buildings, industrial facilities, outdoors, temporary power use, and medical facilities; the special natural environment of use includes humid and high-temperature environments. In the actual performance test of the leakage protection device, heating equipment and humidifying equipment are used to simulate the actual usage scenario, thereby achieving an accurate description of the test environment for the performance test, and further improving the relevance between the performance test result and the environment.

[0033] Further, the specific method for obtaining the environmental factor influence coefficient is as follows: Number the performance tests, and analyze the environmental factors during the performance tests to obtain the corresponding temperature level and humidity level; Use temperature and humidity sensors to obtain the initial temperature value and initial humidity value of the leakage protection device during the performance test and perform normalization processing to obtain the corresponding temperature value and humidity value, and combine the obtained temperature level and humidity level to obtain the environmental factor influence coefficient. The temperature and humidity sensors include a temperature sensor and a humidity sensor. The environmental factor influence coefficient can not only be expressed by summing the initial temperature value and initial humidity value after normalization processing during the performance test, but also can be calculated more precisely. It is calculated according to the temperature level, humidity level, temperature value, and humidity value. The environmental factor influence coefficient is calculated using the following formula:

[0034]

[0035] Among them, HJ d is the environmental factor influence coefficient of the leakage protection device in the d-th performance test, d is the numbering of the performance test, d = 1, 2, 3,..., D, D is the total number of performance tests, a d is the temperature level of the leakage protection device in the d-th performance test, b d is the humidity level of the leakage protection device in the d-th performance test, w d is the temperature value of the leakage protection device in the d-th performance test, s d is the humidity value of the leakage protection device in the d-th performance test, and e represents the natural constant.

[0036] In this embodiment, the statistical table of environmental factor influence coefficient changes is shown in Table 1:

[0037] Table 1 Statistical table of environmental factor influence coefficient changes

[0038]

[0039] Specifically, the unit of the temperature value is °C, and the unit of the humidity value is %. It can be seen from the statistical table of environmental factor influence coefficient changes that during the performance test of the leakage protection device, when the temperature level is the same, the greater the humidity level, the greater the environmental factor influence coefficient; when the humidity level is the same, the greater the temperature level, the greater the environmental factor influence coefficient. The greater the temperature level and humidity level indicate that the leakage protection device is in a special environment, and the greater the environmental factor influence coefficient. Based on the environmental factor influence coefficient in the leakage protection device test, the test environment of the leakage protection device test can be clearly judged, thereby further realizing a closer association between the performance test result and the environment, and further improving the relevance between the performance test result and the environment.

[0040] Further, the inspection of the leakage protection device includes an appearance inspection and a connection inspection; the appearance inspection of the leakage protection device is carried out by observing the appearance of the leakage protection device, and the appearance inspection includes checking the integrity of the housing of the leakage protection device and the consistency of the housing markings. The integrity of the housing represents the degree of integrity of the housing of the leakage protection device, and the consistency of the housing markings represents the degree of consistency between the housing markings of the leakage protection device and the device specifications and manufacturer information of the leakage protection device; the preset connection method is obtained according to the detailed installation and connection instructions provided by the manufacturer of the leakage protection device and the connection is inspected. The connection inspection includes the compliance of the connection line and the safety of the connection line; the compliance of the connection line represents the degree of compliance between the connection method of the input line and the output line of the leakage protection device and the preset connection method; the safety of the connection line represents the degree of damage of the connectors and sockets in the connection line.

[0041] In this embodiment, the housing markings of the leakage protection device include model, specifications, compliance standards, rated breaking capacity, production date, safety certification mark, installation and use instructions. The specific compliance standards include International Electrotechnical Commission standards, American safety standards, and standards issued by the Standardization Administration of China; the safety certification marks include EU conformity marks, American safety certifications, and China Compulsory Certification, thus realizing more accurate testing of the leakage protection device, and further realizing the improvement of the correlation between the use performance test results and the environment.

[0042] Further, as Figure 2 shown, the following is the flowchart of injecting simulated leakage current provided by the embodiment of the present application. The specific steps of injecting simulated leakage current into the leakage protection device are as follows: Step 1, connect the leakage protection device: connect the current source to the leakage protection device according to the preset connection method; Step 2, inject simulated leakage current: start the current source to inject simulated leakage current into the leakage protection device and adjust the current source through the adjustment button of the current source to set the magnitude of the corresponding simulated leakage current; Step 3, record the current time information: use an ammeter and an oscilloscope to measure the simulated leakage current in the leakage protection device and record the corresponding simulated leakage current amplitude and time.

[0043] In this embodiment, in actual use, connecting the current source to the leakage protection device according to the preset connection method includes the connection between the leakage protection device and other test equipment and the connection of test fixtures and adapters. Specifically, the connection between the leakage protection device and other test equipment includes the connection of the test interface of the leakage protection device to the power supply line, the test current line, and the ground wire, thus realizing the improvement of the accuracy of the use performance test, and further realizing the improvement of the correlation between the use performance test results and the environment.

[0044] Further, the specific process of obtaining the sensitivity coefficient of the leakage protection device is as follows: Inject an analog leakage current into the leakage protection device and adjust the initial analog leakage current through a current source to convert the initial analog leakage current into a test analog current. The initial analog leakage current is a current not greater than the leakage current parameter of the leakage protection device, and the test analog current is a current greater than the leakage current parameter of the leakage protection device; Obtain the leakage action time according to the time information of the analog leakage current recorded by the oscilloscope, and obtain the corresponding sensitivity coefficient in combination with the leakage current amplitude in the leakage protection device.

[0045] In this embodiment, in actual use, the analog leakage current and the leakage current parameter are usually in milliamperes. For example, common leakage current parameters are from 10 mA to 30 mA; The leakage action time is usually in milliseconds. For example, for a device with a low leakage current parameter of 10 mA, the leakage action time is usually between dozens of milliseconds and hundreds of milliseconds. This type of leakage protection device is usually used in occasions with extremely high requirements for personal safety such as medical equipment, achieving an improvement in the correlation between the use performance test results and the environment.

[0046] Further, as Figure 3 shown, it is a flowchart for obtaining the leakage action time provided by the embodiment of the present application. The specific method for obtaining the leakage action time is as follows: Obtain the leakage action waveform interval: Obtain the leakage action waveform interval according to the current waveform of the analog leakage current obtained by the oscilloscope, and obtain the start amplitude and the end amplitude according to the leakage action waveform interval. The leakage action waveform interval is the current waveform interval of the analog current that causes the leakage action. The start amplitude is the amplitude of the analog current corresponding to the start point of the interval of the leakage action waveform interval, and the end amplitude is the amplitude of the analog current corresponding to the end point of the interval of the leakage action waveform interval; Obtain the leakage action time: Obtain the time nodes of the leakage action waveform interval through the time scale on the oscilloscope, and obtain the leakage action time according to the difference between the time nodes of the leakage action waveform interval. The time nodes include the start time node and the end time node. The start time node is the start time node corresponding to the leakage action waveform interval, and the end time node is the end time node corresponding to the leakage action waveform interval.

[0047] In this embodiment, an oscilloscope generally includes a display screen, a control panel, an input interface, a vertical amplifier, and a horizontal amplifier. The display screen is the core component of the oscilloscope and is used to display the waveform of the input signal; the control panel is used to control various functions and parameter settings of the oscilloscope; the vertical amplifier is used to amplify the input signal and send the amplified signal to the display screen for display; the horizontal amplifier is used to control the display range and time resolution of the waveform on the time axis. In addition, the oscilloscope also has measurement, analysis, storage, and playback functions. Specifically, the measurement functions include measuring waveform amplitude, frequency, peak-to-peak value, and period; the storage function can save the captured waveform to the internal memory or external storage medium and perform playback, analysis, and export, thereby achieving more accurate measurement of the leakage action time and further improving the relevance between the use performance test results and the environment.

[0048] Furthermore, the sensitivity coefficient of the leakage protection device can not only be directly obtained from the average value of the leakage action time in the use performance test of the leakage protection device, but also can be calculated more precisely. It is calculated according to the time nodes, corresponding start amplitudes and end amplitudes in the leakage action waveform interval, and the environmental grade of the use performance test of the leakage protection device. The sensitivity coefficient of the leakage protection device is calculated using the following formula:

[0049]

[0050] where LM d is the sensitivity coefficient of the leakage protection device in the d-th use performance test, d is the numbering of the use performance test times, d = 1, 2, 3,..., D, D is the total number of use performance tests, f d.e is the end amplitude of the leakage protection device in the d-th use performance test, f d.o is the start amplitude of the leakage protection device in the d-th use performance test, T d.e is the end time node of the leakage protection device in the d-th use performance test, T d.o is the start time node of the leakage protection device in the d-th use performance test, a d is the temperature grade of the leakage protection device in the d-th use performance test, b d is the humidity grade of the leakage protection device in the d-th use performance test, and e represents the natural constant.

[0051] In this embodiment, the horizontal axis of the oscilloscope is displayed as the time resolution. The time resolution of the oscilloscope represents its ability to distinguish the time difference between two signals. A higher time resolution means that the oscilloscope can more accurately display the time characteristics of the signal. The amplitude refers to the voltage amplitude of the measured signal. In actual tests, when the amplitude of the leakage current suddenly changes, it means that there is a safety risk in the abnormal operation of the equipment using the leakage protection device. The leakage protection device should be able to quickly identify the change in the amplitude of the leakage current to protect the safety of electricity use, thus realizing the correlation between the sensitivity of the leakage protection device and environmental factors, and further improving the correlation between the use performance test results and the environment.

[0052] Furthermore, the specific steps for obtaining the use performance index of the leakage protection device are as follows: Obtain the change amount of the environmental factor influence coefficient according to the environmental factor influence coefficients in two adjacent use performance tests of the leakage protection device. The change amount of the environmental factor influence coefficient represents the degree of environmental change in testing the use performance of the leakage protection device. Perform averaging operations on the change amount of the environmental factor influence coefficient, the leakage action time, and the sensitivity coefficient respectively to obtain the corresponding average change amount of the environmental factor influence coefficient, the average leakage action time, and the average sensitivity coefficient, and combine the first average leakage action time obtained by normalizing the average leakage action time to obtain the use performance index of the leakage protection device. The first average leakage action time represents the result of normalizing the average leakage action time.

[0053] In this embodiment, normalizing the average leakage action time is to eliminate the unit of the average leakage action time. The unit of the average leakage action time is milliseconds. In the use performance test of the leakage protection device, the change amount of the environmental factor influence coefficient is a positive value. Specifically, the change amount of the environmental factor influence coefficient is the absolute value of the subtraction of the environmental factor influence coefficients in two adjacent use performance tests, thus realizing the correlation between the use performance of the leakage protection device and environmental factors, and further improving the correlation between the use performance test results and the environment.

[0054] Furthermore, the use performance index of the leakage protection device can not only be directly obtained through the ratio of the environmental factor influence coefficient to the sensitivity coefficient in the use performance test of the leakage protection device, but also can be calculated more precisely. Calculate the use performance index of the leakage protection device according to the average change amount of the environmental factor influence coefficient, the average leakage action time, and the average sensitivity coefficient. The use performance index of the leakage protection device is calculated using the following formula:

[0055] XN=(e - 2) S *log2(1 + H*L);

[0056] Among them, XN is the performance index of the leakage protection device, S is the average value of the first leakage action time when testing the performance of the leakage protection device, H is the average change amount of the environmental factor influence coefficient when testing the performance of the leakage protection device, L is the average value of the sensitivity coefficient when testing the performance of the leakage protection device, and e represents the natural constant.

[0057] In this embodiment, as Figure 4 shown, it is a graph of the change in the performance index provided by the embodiment of the present application. Taking the average value of the first leakage action time as 11 and the average value of the sensitivity coefficient as 6 as an example, it can be seen from the graph that the larger the average change amount of the environmental factor influence coefficient when testing the performance of the leakage protection device, the larger the performance index of the leakage protection device, indicating that the leakage protection device can adapt to larger environmental factor changes, thus further realizing the correlation between the performance test result of the leakage protection device and the environmental factors, and further improving the correlation between the performance test result and the environment.

[0058] Furthermore, the specific process of warning the performance of the leakage protection device is as follows: Test multiple leakage protection devices, and calculate the average value of the performance indexes of the leakage action time exceeding the standard cut-off time range of the leakage protection device to obtain a preset warning threshold. The standard cut-off time range of the leakage protection device is the cut-off time range marked in the user manual of the leakage protection device. The preset warning threshold represents the critical value when the leakage protection device is put into actual use in a specified environmental factor; Compare the performance index of the leakage protection device with the preset warning threshold. If the performance index of the leakage protection device is less than the preset warning threshold, a warning is issued, indicating that the leakage protection device does not meet the requirements for being put into actual use, otherwise it means that the leakage protection device is put into actual use.

[0059] In this embodiment, in actual use, the user manual of the leakage protection device usually provides the cut-off time of the leakage protection device at different leakage current levels, as well as the corresponding action time curves and tables. The cut-off time range marked in the user manual of the leakage protection device is usually between dozens of milliseconds and hundreds of milliseconds, thus realizing the warning of the performance of the leakage protection device under different environmental factors, and further improving the correlation between the performance test result and the environment.

[0060] In summary, in the embodiment of the present application, the environmental factor level is obtained by analyzing the environmental factors of the performance test, then the environmental factor influence coefficient is obtained according to the environmental factor level. Next, the test device is checked and connected, the leakage current parameter is set and the test is carried out. The sensitivity coefficient is obtained according to the leakage action time obtained during the test. Finally, the performance index is obtained according to the environmental factor influence coefficient, the sensitivity coefficient and the leakage action time, thereby realizing the association between the performance test result and the environment, and further realizing the improvement of the relevance between the performance test result and the environment, effectively solving the problem of low relevance between the performance test result and the environment in the prior art.

[0061] Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0062] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for realizing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0063] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means realizes the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0064] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide means for realizing the specified functions in Figure 1Steps of the functions specified in one or more processes and / or boxes Figure 1 Steps of the functions specified in one box or more boxes.

[0065] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A method for testing the performance of a leakage protection device, characterized in that, It includes the following steps: S1. Analyze the environmental factors for testing the performance of the leakage protection device according to the actual usage scenario of the leakage protection device to obtain the environmental factor levels, where the environmental factor levels include temperature levels and humidity levels; S2. Obtain the environmental factor influence coefficient according to the environmental factor levels, where the environmental factor influence coefficient represents the degree of influence of environmental factors on the performance of the leakage protection device; The specific method for obtaining the environmental factor influence coefficient is as follows: Number the performance tests, and analyze the environmental factors during the performance tests to obtain the corresponding temperature levels and humidity levels; Obtain the initial temperature value and initial humidity value of the leakage protection device during the performance test through a temperature and humidity sensor, perform normalization processing to obtain the corresponding temperature value and humidity value, and obtain the environmental factor influence coefficient in combination with the obtained temperature levels and humidity levels; S3. Inspect the leakage protection device and connect the ammeter and oscilloscope to the leakage protection device according to the preset connection method; S4. Set the leakage current parameter according to the electrical safety standard followed by the leakage protection device and the environmental factor influence coefficient; S5. Inject a simulated leakage current into the leakage protection device and record the corresponding leakage action time, and thereby obtain the sensitivity coefficient of the leakage protection device, where the sensitivity coefficient represents the sensitivity degree of the leakage protection device; The sensitivity coefficient of the leakage protection device is calculated using the following formula: Among them, LM d is the sensitivity coefficient of the leakage protection device in the d-th performance test of use, where d is the numbering of the performance test of use, d = 1, 2, 3,..., D, and D is the total number of performance tests of use, f d.e is the end amplitude of the leakage protection device in the d-th performance test of use, f d.o is the start amplitude of the leakage protection device in the d-th performance test of use, T d.e is the end time node of the leakage protection device in the d-th performance test of use, T d.o is the start time node of the leakage protection device in the d-th performance test of use, a d is the temperature grade of the leakage protection device in the d-th performance test of use, b d is the humidity grade of the leakage protection device in the d-th performance test of use, where e represents the natural constant; S6. Obtain the performance index of the leakage protection device according to the environmental factor influence coefficient, sensitivity coefficient, and leakage action time of the leakage protection device, and give an early warning of the performance of the leakage protection device according to the performance index of the leakage protection device. The performance index is used to describe the safety degree of the leakage protection device in actual use; The performance index of the leakage protection device is calculated using the following formula: XN=(e - 2) S *log2(1 + H*L); Where XN is the performance index of the leakage protection device, S is the average value of the first leakage action time when testing the performance of the leakage protection device, H is the average change value of the environmental factor influence coefficient when testing the performance of the leakage protection device, L is the average value of the sensitivity coefficient when testing the performance of the leakage protection device, and e represents the natural constant; The specific process for obtaining the sensitivity coefficient of the leakage protection device is as follows: Inject a simulated leakage current into the leakage protection device and adjust the initial simulated leakage current through a current source to transform the initial simulated leakage current into a test simulated current; Obtain the leakage action time according to the time information of the simulated leakage current recorded by the oscilloscope, and obtain the corresponding sensitivity coefficient in combination with the leakage current amplitude in the leakage protection device; The specific method for obtaining the leakage action time is as follows: Obtain the leakage action waveform interval according to the current waveform of the simulated leakage current obtained by the oscilloscope, and obtain the start amplitude and end amplitude according to the leakage action waveform interval; Obtain the time nodes of the leakage action waveform interval through the time scale on the oscilloscope, and obtain the leakage action time according to the difference between the time nodes of the leakage action waveform interval. The time nodes include the start time node and the end time node; The specific steps for obtaining the performance index of the leakage protection device are as follows: Obtain the change amount of the environmental factor influence coefficient according to the environmental factor influence coefficient in two adjacent performance tests of the leakage protection device; Respectively perform averaging operations on the change amount of the environmental factor influence coefficient, the leakage action time, and the sensitivity coefficient to obtain the corresponding average change amount of the environmental factor influence coefficient, the average leakage action time, and the average sensitivity coefficient, and combine the first average leakage action time obtained by normalizing the average leakage action time to obtain the performance index of the leakage protection device.

2. The method for testing the performance of a leakage protection device according to claim 1, characterized in that: The inspection of the leakage protection device includes appearance inspection and connection condition inspection; The appearance inspection includes checking the integrity of the outer shell of the leakage protection device and the consistency of the outer shell markings; The connection condition inspection includes the compliance of the connection line and the safety of the connection line.

3. The method for testing the performance of a leakage protection device according to claim 1, characterized in that The specific steps for injecting simulated leakage current into the leakage protection device are as follows: Step 1, connect the current source to the leakage protection device according to the preset connection method; Step 2, start the current source to inject simulated leakage current into the leakage protection device and set the magnitude of the corresponding simulated leakage current by adjusting the current source; Step 3, use an ammeter and an oscilloscope to measure the simulated leakage current in the leakage protection device and record the corresponding simulated leakage current amplitude and time information.

4. The method for testing the performance of a leakage protection device according to claim 1, characterized in that , The specific process of warning the performance of the leakage protection device is as follows: Obtain a preset warning threshold according to the actual use environment of the user and the standard cut-off time range of the leakage protection device. The standard cut-off time range of the leakage protection device is the cut-off time range marked in the user manual of the leakage protection device; Compare the performance index of the leakage protection device with the preset warning threshold. If the performance index of the leakage protection device is less than the preset warning threshold, a warning is issued. Otherwise, the leakage protection device is put into actual use.

Images