Thermal protector maximum bearing current test system and test method

Abstract

The invention relates to the technical field of electronics, in particular to a maximum bearing current test system and method for a thermal protector, and the system obtains the maximum bearing current of each test of the thermal protector through multiple tests of the thermal protector in a constant temperature environment, and simulates each temperature environment to obtain the temperature adaptability of the thermal protector. The protection performance evaluation coefficient of the thermal protector is obtained through the triggering duration and the recovery duration of each test of the thermal protector, and the working stability of the thermal protector is obtained through analysis according to the state parameters of the thermal protector under the maximum bearing current. Voltage values and current values of the thermal protector under electromagnetic radiation of all intensities and voltage values and current values of the thermal protector under electromagnetic radiation of all frequencies under the maximum bearing current are obtained, then the anti-interference capability of the thermal protector is obtained through analysis, and comprehensive performance evaluation indexes of the thermal protector under the maximum bearing current are obtained through comprehensive analysis. And the reliability of the thermal protector under the maximum bearing current is ensured.

Description

Technical Field

[0001] The invention relates to the field of electronic technology, and in particular to a maximum carrying current testing system and a testing method for a thermal protector. Background Art

[0002] In modern electronic and electrical equipment, thermal protectors are important components to ensure the safe operation of the equipment. As various types of equipment become increasingly complex and diverse, the performance requirements for thermal protectors are also getting higher and higher.

[0003] Current is one of the key factors that affect the working state of the thermal protector. Accurately understanding the maximum carrying current of the thermal protector is crucial to ensuring the safe operation of the equipment within the normal operating current range. If the maximum carrying current is not clearly understood, it may lead to misjudgment in actual use, failure to protect the equipment in a timely and effective manner, and even cause equipment failure, damage or safety accidents. In-depth research and accurate testing of the maximum carrying current of the thermal protector is an important basis for promoting the continuous development of the electronic and electrical industry and ensuring the safe and stable operation of equipment.

[0004] The existing Chinese patent with application number 202410846989.1 discloses a thermal protector maximum load current test system and test method and a thermal protector. The scheme switches the circuit by controlling the contactor, monitors the current and time in real time, determines whether the action time and reset time are qualified, and performs cyclic testing. The fuse current and load current are determined according to the number of cycles and failure conditions. The test can also be stopped at any time. It can accurately control and monitor parameters such as current and time to ensure the accuracy of the test results.

[0005] However, the above patent has the following problems: the solution tests the maximum load-bearing current of the thermal protector, but does not involve analysis of the performance of the thermal protector under the maximum load-bearing current, such as temperature adaptability, working stability, etc., resulting in an incomplete evaluation of the performance of the thermal protector and a lack of accurate prediction of the performance of the thermal protector in actual application scenarios. Summary of the invention

[0006] In order to overcome the shortcomings of the background technology, the embodiments of the present invention provide a thermal protector maximum load current testing system and testing method, which can effectively solve the problems involved in the above-mentioned background technology.

[0007] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a thermal protector maximum load-bearing current testing system, including: a maximum load-bearing current testing module, which is used to monitor the actual current value of the thermal protector at each monitoring time point under a constant temperature environment, determine whether the thermal protector is triggered, and obtain the maximum load-bearing current of the thermal protector in each test through multiple tests.

[0008] The action current consistency analysis module is used to analyze the action current consistency of the thermal protector according to the maximum load current of each test of the thermal protector.

[0009] The temperature adaptability analysis module is used to simulate various temperature environments, test the maximum carrying current of the thermal protector at various temperatures, and then analyze the temperature adaptability of the thermal protector.

[0010] The protection performance evaluation module is used to monitor the triggering time and recovery time of each test of the thermal protector during the maximum load current test of the thermal protector, and analyze and obtain the protection performance evaluation coefficient of the thermal protector.

[0011] The state analysis module is used to obtain the state parameters of the thermal protector under the maximum load current, and then analyze the working stability of the thermal protector. The state parameters include temperature qualification and vibration frequency.

[0012] The anti-interference capability analysis module is used to obtain the voltage value and current value of the thermal protector under electromagnetic radiation of various intensities under the maximum carrying current, as well as the voltage value and current value of electromagnetic radiation of various frequencies, and then analyze and obtain the anti-interference capability of the thermal protector.

[0013] The comprehensive analysis module is used to obtain the comprehensive performance evaluation index of the thermal protector under the maximum carrying current according to the thermal protector's action current consistency α, temperature adaptability β, protection performance evaluation coefficient γ, working stability ε, and anti-interference ability ψ analysis, and provide feedback.

[0014] Management database for storing preset maximum allowable temperatures of thermal protectors.

[0015] Preferably, the present invention provides a method for testing the maximum carrying current of a thermal protector, and the specific steps of the testing method are as follows: S1. Maximum carrying current test: monitor the actual current value of the thermal protector at each monitoring time point under a constant temperature environment to determine whether the thermal protector is triggered, and obtain the maximum carrying current of the thermal protector in each test through multiple tests.

[0016] S2. Analysis of operating current consistency: The operating current consistency of the thermal protector is obtained based on the maximum load current of each test of the thermal protector.

[0017] S3. Temperature adaptability analysis: Simulate various temperature environments, test the maximum load current of the thermal protector at each temperature, and then analyze and obtain the temperature adaptability of the thermal protector.

[0018] S4. Protection performance evaluation: During the maximum load current test of the thermal protector, the triggering time and recovery time of each test of the thermal protector are monitored, and the protection performance evaluation coefficient of the thermal protector is obtained by analysis.

[0019] S5. State analysis: Obtain the state parameters of the thermal protector under the maximum load current, and then analyze the working stability of the thermal protector. The state parameters include temperature qualification and vibration frequency.

[0020] S6. Anti-interference capability analysis: Obtain the voltage and current values ​​of the thermal protector under electromagnetic radiation of various intensities under the maximum carrying current, as well as the voltage and current values ​​under electromagnetic radiation of various frequencies, and then analyze and obtain the anti-interference capability of the thermal protector.

[0021] S7. Comprehensive analysis: Based on the thermal protector's action current consistency, temperature adaptability, protection performance evaluation coefficient, working stability, and anti-interference ability, the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is obtained and feedback is provided.

[0022] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: First, the system obtains the maximum carrying current of the thermal protector in each test by multiple tests of the thermal protector in a constant temperature environment, and then analyzes and obtains the consistency of the thermal protector's operating current, thereby improving the overall safety and stability of the equipment.

[0023] 2. This system tests the maximum load current of the thermal protector at various temperatures, and then analyzes the temperature adaptability of the thermal protector to ensure that the equipment can be effectively protected under different temperature conditions and avoid malfunction or non-action of the thermal protector due to temperature changes.

[0024] 3. This system monitors the triggering time and recovery time of each test of the thermal protector during the maximum load current test of the thermal protector, and analyzes the protection performance evaluation coefficient of the thermal protector. It can comprehensively and quantitatively evaluate the effectiveness of the thermal protector in protecting circuits and equipment.

[0025] 4. This system obtains the state parameters of the thermal protector under the maximum load current, and then analyzes the working stability of the thermal protector. It can deeply understand the performance changes of the thermal protector under long-term or high-load working conditions, ensure that the thermal protector continues to protect the circuit reliably, and will not malfunction or lose its protection function due to fluctuations in its own performance.

[0026] 5. This system obtains the voltage and current values ​​of the thermal protector under electromagnetic radiation of various intensities under the maximum carrying current, as well as the voltage and current values ​​under electromagnetic radiation of various frequencies, and then analyzes the anti-interference ability of the thermal protector to ensure that the thermal protector can still accurately perform current protection actions in an environment with electromagnetic interference, avoiding false operations or non-operation due to electromagnetic interference, thereby improving the applicability of the thermal protector in complex electromagnetic environments.

[0027] 6. This system obtains the comprehensive performance evaluation index of the thermal protector under the maximum load current through comprehensive analysis and provides feedback, which is conducive to continuously improving the comprehensive performance of the thermal protector. At the same time, the feedback mechanism can also promote the continuous optimization of related work. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 The module connection diagram of a thermal protector maximum load current test system.

[0030] Figure 2 for Figure 1 Schematic diagram of the process of the maximum carrying current test module.

[0031] Figure 3 The present invention is a flow chart of a method for testing the maximum carrying current of a thermal protector. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 As shown, a thermal protector maximum carrying current testing system includes a maximum carrying current testing module, an action current consistency analysis module, a temperature adaptability analysis module, a protection performance evaluation module, a state analysis module, an anti-interference capability analysis module, a comprehensive analysis module, and a management database.

[0034] The comprehensive analysis module is connected to the voltage change analysis module, the state analysis module, the maximum carrying current analysis module, the action timeliness analysis module, the anti-interference ability analysis module, the environmental adaptability analysis module, and the management database, and the management database is connected to the voltage change analysis module, the state analysis module, the maximum carrying current analysis module, the action timeliness analysis module, the anti-interference ability analysis module, and the environmental adaptability analysis module.

[0035] The maximum load current test module is used to monitor the actual current value of the thermal protector at each monitoring time point in a constant temperature environment, determine whether the thermal protector is triggered, and obtain the maximum load current of the thermal protector in each test through multiple tests.

[0036] See also Figure 2 As shown, the specific analysis method of the maximum load current test module is: the first step is to set the test environment temperature according to the setting, control the environment temperature in a constant temperature state, adjust the initial current value of the thermal protector to the set current value through the adjustable resistor, and increase the current value of the thermal protector in turn according to the set current difference, and at the same time select a number of monitoring time points with equal time intervals, and use the current sensor to monitor to obtain the actual current value of the thermal protector at each monitoring time point; the response data of the thermal protector under different current and constant temperature environments can be comprehensively and meticulously obtained, which is helpful to gain a deeper understanding of its performance.

[0037] In the second step, if the actual current value of the thermal protector at a certain monitoring time point is 0, then the thermal protector is judged to be triggered at the monitoring time point, and the actual current value of the thermal protector at the previous monitoring time point corresponding to the monitoring time point is obtained, and it is recorded as the maximum test load current of the thermal protector; the method of clearly judging the triggering action of the thermal protector can accurately lock the approximate value of its maximum load current, which is very critical to the performance evaluation of the thermal protector.

[0038] The third step is to test the thermal protector multiple times according to the method of analyzing the maximum load-bearing current of the thermal protector test, obtain the maximum load-bearing current of the thermal protector in each test, and obtain the maximum load-bearing current of the thermal protector by taking the average value; this can improve the accuracy and stability of the evaluation of the maximum load-bearing current of the thermal protector, which is conducive to ensuring its reliability in practical applications.

[0039] The action current consistency analysis module is used to analyze the action current consistency of the thermal protector according to the maximum load current of each test of the thermal protector.

[0040] The specific analysis method of the action current consistency analysis module is: read the maximum carrying current of each test of the thermal protector, recorded as Where i represents the number of the i-th test, i = 1, 2, ..., n, and substitute it into the formula The action current consistency α of the thermal protector is obtained, where n represents the number of tests; this ensures that the circuit can be reliably cut off under expected overload current conditions, avoiding untimely protection or malfunction due to fluctuations in the action current.

[0041] The temperature adaptability analysis module is used to simulate various temperature environments, test the maximum carrying current of the thermal protector at various temperatures, and then analyze the temperature adaptability of the thermal protector.

[0042] The specific analysis method of the temperature adaptability analysis module is: simulate the test environment according to the set temperature gradient, record it as each temperature environment, place the thermal protector in each temperature environment to work, analyze and obtain the maximum carrying current of the thermal protector in each test at each temperature according to the method of analyzing the maximum carrying current of the thermal protector, and obtain the maximum carrying current of the thermal protector at each temperature by taking the average value, record it as m represents the number of the mth temperature environment, m=1,2,...,q, substitute it into the formula The temperature adaptability β of the thermal protector is obtained, q represents the number of temperature environments; it helps to understand the adaptability of the thermal protector in various actual working temperature ranges and ensure that it can play a normal protective role in different thermal environments.

[0043] The protection performance evaluation module is used to monitor the triggering time and recovery time of each test of the thermal protector during the maximum load current test of the thermal protector, and analyze and obtain the protection performance evaluation coefficient of the thermal protector.

[0044] The specific analysis method of the protection performance evaluation module is as follows: the first step is to monitor the time from the application of the maximum load current to the triggering action of the thermal protector during each test of the thermal protector, which is recorded as the triggering time of each test of the thermal protector, recorded as T i , substituting it into the formula Get the triggering timeliness of the thermal protector ρ 触发 , T 0 It represents the preset reference triggering time, and n represents the number of tests. It can quantify the timeliness of the thermal protector's response to overload conditions, ensuring that the equipment can be protected in time when overloaded, thereby improving the safety and reliability of the equipment.

[0045] In the second step, after the thermal protector is triggered in each test, several time points are selected according to the set time interval, which are recorded as each monitoring time point. The current at each monitoring time point is detected by an ammeter to obtain the current value of the thermal protector at each monitoring time point, which is compared with the preset low current threshold. When the current value of the thermal protector at a certain monitoring time point drops to the low current threshold, the time it takes for the thermal protector to automatically recover to the initial state is monitored to obtain the recovery time of each test of the thermal protector. The recovery timeliness of the thermal protector is analyzed according to the method of analyzing the triggering timeliness of the thermal protector, which is recorded as ρ. 恢复 ; It reflects the ability of the equipment to recover quickly after a short-term fault and helps to evaluate the response speed and continuous protection capability of the thermal protector.

[0046] The third step is to set the triggering timeliness of the thermal protector to ρ 触发 , recovery timelinessρ 恢复 Substituting into the formula γ=ρ 触发*φ 1 +ρ 恢复 *φ 2 Get the protection performance evaluation coefficient γ, φ of the thermal protector 1 ,φ 2 They respectively represent the weight factors of the preset trigger timeliness and recovery timeliness; they can more accurately reflect the comprehensive effect of the key performance indicators of the thermal protector and ensure the safety and reliability of the thermal protector in practical applications.

[0047] It should be noted that, in a specific embodiment, φ 1 Can be set to 0.6, φ 2 It can be set to 0.4. The core function of the thermal protector is to prevent the protected equipment from being damaged due to overheating. For example, for large motors in industry, the internal temperature of the motor continues to rise when the motor is running. Once the critical temperature is exceeded, the thermal protector must be triggered immediately to prevent the temperature from rising further. If the trigger is not timely, the key components of the motor, such as the winding, may suffer irreversible damage in a very short time. This damage may cause the entire motor to be scrapped, the maintenance cost is extremely high and will affect the production process. The timeliness of recovery has relatively more room for adjustment during the maintenance of the equipment. If it is found that the thermal protector is not restored in time, the reset mechanism of the thermal protector, related heat dissipation conditions and other factors can be checked during the regular maintenance of the equipment to improve it. Therefore, the weight corresponding to the trigger timeliness is higher.

[0048] The state analysis module is used to obtain the state parameters of the thermal protector under the maximum load current, and then analyze the working stability of the thermal protector. The state parameters include temperature qualification and vibration frequency.

[0049] The specific analysis method of the state parameters of the thermal protector under the maximum load current is as follows: the first step is to select a set detection point on the thermal protector, and detect the temperature of the detection point at each time point during the working process of the thermal protector under the maximum load current through a temperature sensor to obtain the temperature of the thermal protector at each time point under the maximum load current; read the preset maximum allowable temperature of the thermal protector from the management database, and obtain the temperature qualification degree δ of the thermal protector under the maximum load current by comparing the temperature of the thermal protector at each time point under the maximum load current with the preset maximum allowable temperature of the thermal protector; this can ensure that the temperature of the thermal protector is within a safe allowable range, prevent equipment failure, damage or even safety risks caused by excessive temperature, and improve the safety and stability of equipment operation.

[0050] It should be noted that the specific analysis method for the temperature qualification degree of the thermal protector under the maximum load current is: read the temperature of the thermal protector at each time point under the maximum load current, and record it as f represents the number of the fth time point, f = 1, 2, ..., k, and the preset maximum allowable temperature of the thermal protector is recorded as Substituting this into the formula The temperature qualification degree δ of the thermal protector under the maximum carrying current is obtained, and k represents the number of time points.

[0051] In the second step, two adjacent time points are taken as a time period, so as to divide the working process of the thermal protector into several time periods. The vibration times of the detection point in each time period during the working process of the thermal protector under the maximum load current are counted by the vibration sensor, and the vibration times of the thermal protector in each time period under the maximum load current are obtained. The vibration frequency of the thermal protector under the maximum load current is calculated and recorded as γ; this helps to discover possible mechanical structure problems or looseness and other abnormalities in advance, so as to ensure the reliable operation of the thermal protector and related equipment.

[0052] It should be noted that the specific analysis method of the vibration frequency of the thermal protector under the maximum load current is: read the vibration frequency of the thermal protector in each time period under the maximum load current, recorded as N j , j represents the number of the jth time period, j=1,2,...,g, through the formula The vibration frequency γ of the thermal protector under the maximum carrying current is obtained, t represents the length of the time period, and g represents the number of time periods.

[0053] The specific analysis method of the state analysis module is: read the temperature qualification level δ and vibration frequency γ of the thermal protector under the maximum load current respectively, and substitute them into the formula The working stability of the thermal protector ε is obtained, where γ 0 Indicates the preset reference vibration frequency, They respectively represent the preset temperature qualification level and the weight factor of the vibration frequency; they are helpful to timely discover potential faults and take corresponding measures to ensure the normal operation of the system where the thermal protector is located.

[0054] It should be noted that, in a specific embodiment, It can be set to 0.6. It can be set to 0.4. The thermal protector's control over the temperature qualification level is directly related to whether the protected equipment can operate in a suitable temperature environment, thus affecting the overall stability and service life of the equipment. The vibration frequency is not the core concern of its design and work. As long as it is within a certain vibration tolerance range, the thermal protector can normally perform its temperature-based protection function. Therefore, the weight corresponding to the temperature qualification level is higher.

[0055] The anti-interference capability analysis module is used to obtain the voltage value and current value of the thermal protector under electromagnetic radiation of various intensities under the maximum carrying current, as well as the voltage value and current value of electromagnetic radiation of various frequencies, and then analyze and obtain the anti-interference capability of the thermal protector.

[0056] The specific analysis method of the anti-interference capability analysis module is as follows: electromagnetic waves of different intensities and frequencies are set according to the settings, recorded as electromagnetic radiation of each intensity and electromagnetic radiation of each frequency, the thermal protector under the maximum load current of the thermal protector is radiated by the electromagnetic radiation source, and the voltage value and current value of the thermal protector under the electromagnetic wave radiation of each intensity and each frequency are detected, and the voltage value and current value of the thermal protector under the electromagnetic radiation of each intensity and each frequency under the maximum load current are obtained, and the voltage value of the thermal protector under the electromagnetic radiation of each intensity under the maximum load current and the voltage value and current value under the electromagnetic radiation of each frequency are recorded as V p , p represents the number of the pth intensity, p = 1, 2, ..., l, and the average voltage value of the thermal protector under the maximum carrying current is obtained by mean calculation, which is recorded as Substituting this into the formula Get the voltage fluctuation degree ξ of the thermal protector under various intensities of electromagnetic radiation at the maximum load current Vp , l represents the number of intensities. According to the same method, the current fluctuation degree of the thermal protector under electromagnetic radiation of various intensities, the voltage fluctuation degree under electromagnetic radiation of various frequencies, and the current fluctuation degree are obtained under the maximum load current, which are respectively denoted as ξ Ip , Vs , Is , s represents the number of the sth frequency, s=1,2,...,z, through the formula Get the anti-interference ability ψ, η of the thermal protector 1 , η 2 , η 3 , η 4 They respectively represent the weight factors of the voltage fluctuation degree and current fluctuation degree under preset electromagnetic radiation of different intensities, the voltage fluctuation degree and current fluctuation degree under electromagnetic radiation of different frequencies, and e represents a natural constant. It helps to determine the thermal protector's resistance to electromagnetic interference under different electromagnetic environments and accurately evaluate the reliability of the thermal protector in different electromagnetic scenarios.

[0057] It should be noted that, in a specific embodiment, n 1 Can be set to 0.3, η 2 Can be set to 0.3, η 3 Can be set to 0.2, η 4It can be set to 0.2. The large voltage fluctuation caused by high-intensity electromagnetic radiation may directly affect the normal working logic and performance of the thermal protector, and is a critical test of its anti-interference ability. Large fluctuations in current will also seriously interfere with the operation of the thermal protector, and the current is closely related to the heating of the thermal protector, which has a greater impact on stability. The voltage fluctuation degree and current fluctuation degree under electromagnetic radiation of different frequencies have smaller weights. Different frequencies will also have certain effects, but relative to the intensity factor, the impact may not be so direct and drastic. Therefore, the voltage fluctuation degree and current fluctuation degree under electromagnetic radiation of different intensities have greater corresponding weights.

[0058] The comprehensive analysis module is used to obtain the comprehensive performance evaluation index of the thermal protector under the maximum carrying current according to the thermal protector's action current consistency α, temperature adaptability β, protection performance evaluation coefficient γ, working stability ε, and anti-interference ability ψ analysis, and provide feedback.

[0059] The specific analysis method of the comprehensive analysis module is: respectively read the action current consistency α, temperature adaptability β, protection performance evaluation coefficient γ, working stability ε, and anti-interference ability ψ of the thermal protector, and substitute them into the formula Get the comprehensive performance evaluation index of the thermal protector under the maximum load current where w 1 、w 2 、w 3 、w 4 、w 5 They respectively represent the preset action current consistency, temperature adaptability, protection performance evaluation coefficient, working stability, and weight factors of anti-interference ability. e represents a natural constant. The comprehensive performance evaluation index of the thermal protector under the maximum carrying current is compared with the preset comprehensive performance evaluation index threshold. If the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is greater than or equal to the preset comprehensive performance evaluation index threshold, it means that the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is qualified. Otherwise, it means that the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is unqualified, and feedback is given to the system. It can ensure that the thermal protector can effectively protect circuits and equipment under the maximum carrying current, reduce the risk of overheating and failure, and thus improve the safety of the overall system.

[0060] It should be noted that, in a specific embodiment, w 1 Can be set to 0.2, w 2 Can be set to 0.2, w 3 Can be set to 0.4, w 4 Can be set to 0.1, w 5It can be set to 0.1. The consistency of the action current is directly related to whether the thermal protector can accurately act when the predetermined action current is reached. If the consistency of the action current is poor, the action time of the thermal protector will be unstable under different individuals or different working conditions. The working environment temperature of the thermal protector varies widely, and stable protection performance needs to be maintained under different temperature environments. Protection performance is the core function of the thermal protector. It comprehensively reflects whether the thermal protector can effectively protect circuits and equipment under various abnormal current conditions such as overload and short circuit. Working stability ensures the reliability of the performance of the thermal protector during long-term operation. Although working stability is very important, it is partially related to indicators such as action current consistency and protection performance to a certain extent. Anti-interference ability mainly refers to whether the thermal protector can work normally in the presence of external interference sources such as electromagnetic interference. In most conventional electrical environments, although there is a certain amount of electromagnetic interference, there are generally certain anti-interference measures when designing the thermal protector. And compared with other indicators, such as action current consistency and protection performance, the anti-interference ability has a relatively small impact on the basic functions of the thermal protector. Therefore, the weight corresponding to the protection performance evaluation coefficient is higher, and the weight corresponding to the action current consistency and temperature adaptability is second, and the weight corresponding to the working stability and anti-interference ability is lower.

[0061] Management database for storing preset maximum allowable temperatures of thermal protectors.

[0062] See also Figure 3 As shown, in addition, the present invention provides a maximum carrying current testing method for a thermal protector, and the specific steps of the testing method are as follows: S1. Maximum carrying current test: Monitor the actual current value of the thermal protector at each monitoring time point under a constant temperature environment to determine whether the thermal protector is triggered, and obtain the maximum carrying current of the thermal protector in each test through multiple tests.

[0063] S2. Analysis of operating current consistency: The operating current consistency of the thermal protector is obtained based on the maximum load current of each test of the thermal protector.

[0064] S3. Temperature adaptability analysis: Simulate various temperature environments, test the maximum load current of the thermal protector at each temperature, and then analyze and obtain the temperature adaptability of the thermal protector.

[0065] S4. Protection performance evaluation: During the maximum load current test of the thermal protector, the triggering time and recovery time of each test of the thermal protector are monitored, and the protection performance evaluation coefficient of the thermal protector is obtained by analysis.

[0066] S5. State analysis: Obtain the state parameters of the thermal protector under the maximum load current, and then analyze the working stability of the thermal protector. The state parameters include temperature qualification and vibration frequency.

[0067] S6. Anti-interference capability analysis: Obtain the voltage and current values ​​of the thermal protector under electromagnetic radiation of various intensities under the maximum carrying current, as well as the voltage and current values ​​under electromagnetic radiation of various frequencies, and then analyze and obtain the anti-interference capability of the thermal protector.

[0068] S7. Comprehensive analysis: Based on the thermal protector's action current consistency, temperature adaptability, protection performance evaluation coefficient, working stability, and anti-interference ability, the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is obtained and feedback is provided.

[0069] This system obtains the maximum carrying current of the thermal protector in each test through multiple tests on the thermal protector under a constant temperature environment, and simulates various temperature environments to obtain the temperature adaptability of the thermal protector. The protection performance evaluation coefficient of the thermal protector is obtained through the triggering time and recovery time of each test of the thermal protector. The working stability of the thermal protector is analyzed through the state parameters of the thermal protector under the maximum carrying current. The anti-interference ability of the thermal protector is analyzed by obtaining the voltage and current values ​​of the thermal protector under electromagnetic radiation of various intensities and electromagnetic radiation of various frequencies under the maximum carrying current. The comprehensive performance evaluation index of the thermal protector under the maximum carrying current is obtained through comprehensive analysis, thereby ensuring the reliability of the thermal protector under the maximum carrying current.

[0070] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention and they are still covered by the protection scope of the present invention.

Claims

1. A thermal protector maximum carrying current test system, characterized in that: The system specifically includes the following modules: The maximum load current test module is used to monitor the actual current value of the thermal protector at each monitoring time point under a constant temperature environment, determine whether the thermal protector is triggered, and obtain the maximum load current of the thermal protector in each test through multiple tests; The operating current consistency analysis module is used to analyze the operating current consistency of the thermal protector according to the maximum load current of each test of the thermal protector; The temperature adaptability analysis module is used to simulate various temperature environments, test the maximum load current of the thermal protector at various temperatures, and then analyze the temperature adaptability of the thermal protector; The protection performance evaluation module is used to monitor the triggering time and recovery time of each test of the thermal protector during the maximum load current test of the thermal protector, and analyze and obtain the protection performance evaluation coefficient of the thermal protector; The state analysis module is used to obtain the state parameters of the thermal protector under the maximum load current, and then analyze the working stability of the thermal protector. The state parameters include the temperature qualification level and the vibration frequency; The anti-interference capability analysis module is used to obtain the voltage value and current value of the thermal protector under electromagnetic radiation of various intensities and electromagnetic radiation of various frequencies under the maximum carrying current, and then analyze and obtain the anti-interference capability of the thermal protector; The comprehensive analysis module is used to analyze and obtain the comprehensive performance evaluation index of the thermal protector under the maximum carrying current according to the thermal protector's action current consistency α, temperature adaptability β, protection performance evaluation coefficient γ, working stability ε, and anti-interference ability ψ, and provide feedback; Management database for storing preset maximum allowable temperatures of thermal protectors.

2. A thermal protector maximum carrying current testing system according to claim 1, characterized in that: The specific analysis method of the maximum carrying current test module is: The first step is to set the test environment temperature according to the setting, control the environment temperature in a constant temperature state, adjust the initial current value of the thermal protector to the set current value through the adjustable resistor, and increase the current value of the thermal protector in turn according to the set current difference, and select several monitoring time points with equal time intervals, and use the current sensor to monitor and obtain the actual current value of the thermal protector at each monitoring time point; In the second step, if the actual current value of the thermal protector at a certain monitoring time point is 0, it is determined that the thermal protector triggers the action at the monitoring time point, and the actual current value of the thermal protector at the monitoring time point corresponding to the previous monitoring time point is obtained, and it is recorded as the maximum test carrying current of the thermal protector; The third step is to test the thermal protector multiple times according to the method of analyzing the maximum load current of the thermal protector test, obtain the maximum load current of the thermal protector in each test, and obtain the maximum load current of the thermal protector by taking the average value.

3. A thermal protector maximum carrying current test system according to claim 2, characterized in that: The specific analysis method of the action current consistency analysis module is: Read the maximum carrying current of the thermal protector in each test, recorded as Where i represents the number of the i-th test, i = 1, 2, ..., n, and substitute it into the formula The operating current consistency α of the thermal protector is obtained, and n represents the number of tests.

4. A thermal protector maximum carrying current testing system according to claim 3, characterized in that: The specific analysis method of the temperature adaptability analysis module is: According to the set temperature gradient, the test environment is simulated respectively, which is recorded as each temperature environment. The thermal protector is placed in each temperature environment to work. According to the method of analyzing the maximum carrying current of the thermal protector, the maximum carrying current of each test of the thermal protector at each temperature is analyzed and obtained. The maximum carrying current of the thermal protector at each temperature is obtained by taking the average value, which is recorded as m represents the number of the mth temperature environment, m=1,2,...,q, substitute it into the formula The temperature adaptability of the thermal protector β is obtained, and q represents the number of temperature environments.

5. A thermal protector maximum carrying current testing system according to claim 1, characterized in that: The specific analysis method of the protection performance evaluation module is: The first step is to monitor the time from the application of the maximum load current to the triggering of the thermal protector during each test of the thermal protector, which is recorded as the triggering time of each test of the thermal protector, recorded as T i , substituting it into the formula Get the triggering timeliness of the thermal protector ρ 触发 , T0 represents the preset reference trigger duration, and n represents the number of tests; In the second step, after the thermal protector is triggered in each test, several time points are selected according to the set time interval, which are recorded as each monitoring time point. The current at each monitoring time point is detected by an ammeter to obtain the current value of the thermal protector at each monitoring time point, which is compared with the preset low current threshold. When the current value of the thermal protector at a certain monitoring time point drops to the low current threshold, the time it takes for the thermal protector to automatically recover to the initial state is monitored to obtain the recovery time of each test of the thermal protector. The recovery timeliness of the thermal protector is analyzed according to the method of analyzing the triggering timeliness of the thermal protector, which is recorded as ρ. 恢复 ; The third step is to set the triggering timeliness of the thermal protector to ρ 触发 , recovery timelinessρ 恢复 Substituting into the formula γ=ρ 触发 *φ1+ρ 恢复 *φ2 is used to obtain the protection performance evaluation coefficient γ of the thermal protector, φ1 and φ2 represent the weight factors of the preset trigger timeliness and recovery timeliness respectively.

6. A thermal protector maximum carrying current testing system according to claim 1, characterized in that: The specific analysis method of the state parameters of the thermal protector under the maximum load current is: The first step is to select a set detection point on the thermal protector, and use a temperature sensor to detect the temperature of the detection point at each time point during the operation of the thermal protector under the maximum load current to obtain the temperature of the thermal protector at each time point under the maximum load current. The preset maximum allowable temperature of the thermal protector is read from the management database, and the temperature of the thermal protector at each time point under the maximum load current is compared with the preset maximum allowable temperature of the thermal protector to obtain the temperature qualification degree δ of the thermal protector under the maximum load current; In the second step, two adjacent time points are taken as a time period, so as to divide the working process of the thermal protector into several time periods. The vibration sensor is used to count the number of vibrations of the detection point in each time period during the working process of the thermal protector under the maximum load current, and the number of vibrations of the thermal protector in each time period under the maximum load current is obtained. The vibration frequency of the thermal protector under the maximum load current is calculated and recorded as γ.

7. A thermal protector maximum carrying current testing system according to claim 6, characterized in that: The specific analysis method of the state analysis module is: Read the temperature qualification level δ and vibration frequency γ of the thermal protector under the maximum load current respectively, and substitute them into the formula The working stability ε of the thermal protector is obtained, where γ0 represents the preset reference vibration frequency, They respectively represent the preset temperature qualification level and the weighting factors of the vibration frequency.

8. A thermal protector maximum carrying current testing system according to claim 1, characterized in that: The specific analysis method of the anti-interference capability analysis module is: According to the setting, electromagnetic waves of different intensities and frequencies are set respectively, which are recorded as electromagnetic radiation of each intensity and electromagnetic radiation of each frequency. The thermal protector under the maximum load current of the thermal protector is radiated by the electromagnetic radiation source, and the voltage value and current value of the thermal protector under the electromagnetic wave radiation of each intensity and frequency are detected respectively, and the voltage value and current value of the thermal protector under the electromagnetic radiation of each intensity and each frequency under the maximum load current are obtained. The voltage value of the thermal protector under the electromagnetic radiation of each intensity under the maximum load current is recorded as V p , p represents the number of the pth intensity, p = 1, 2, ..., l, and the average voltage value of the thermal protector under the maximum carrying current is obtained by mean calculation, which is recorded as Substituting this into the formula Get the voltage fluctuation degree ξ of the thermal protector under various intensities of electromagnetic radiation at the maximum load current Vp , l represents the number of intensities. According to the same method, the current fluctuation degree of the thermal protector under electromagnetic radiation of various intensities, the voltage fluctuation degree under electromagnetic radiation of various frequencies, and the current fluctuation degree are obtained under the maximum load current, which are respectively denoted as ξ Ip , Vs , Is , s represents the number of the sth frequency, s=1,2,...,z, through the formula The anti-interference ability ψ of the thermal protector is obtained, η1, η2, η3, η4 respectively represent the weight factors of the voltage fluctuation degree, current fluctuation degree under preset electromagnetic radiation of different intensities, voltage fluctuation degree, current fluctuation degree under electromagnetic radiation of different frequencies, and e represents a natural constant.

9. A thermal protector maximum carrying current testing system according to claim 1, characterized in that: The specific analysis method of the comprehensive analysis module is: Read the thermal protector's action current consistency α, temperature adaptability β, protection performance evaluation coefficient γ, working stability ε, and anti-interference ability ψ analysis respectively, and substitute them into the formula Get the comprehensive performance evaluation index of the thermal protector under the maximum load current Among them, w1, w2, w3, w4, and w5 represent the preset weight factors of action current consistency, temperature adaptability, protection performance evaluation coefficient, working stability, and anti-interference ability respectively, and e represents a natural constant. The comprehensive performance evaluation index of the thermal protector under the maximum carrying current is compared with the preset comprehensive performance evaluation index threshold. If the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is greater than or equal to the preset comprehensive performance evaluation index threshold, it means that the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is qualified. Otherwise, it means that the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is unqualified, and feedback is given to the system.

10. A method for testing the maximum carrying current of a thermal protector, characterized in that: The specific steps of the control method are as follows: S1. Maximum carrying current test: Under constant temperature environment, the actual current value of the thermal protector at each monitoring time point is monitored to determine whether the thermal protector is triggered, and the maximum carrying current of each test of the thermal protector is obtained through multiple tests; S2. Analysis of operating current consistency: According to the maximum load current of each test of the thermal protector, the operating current consistency of the thermal protector is obtained; S3. Temperature adaptability analysis: Simulate various temperature environments, test the maximum carrying current of the thermal protector at each temperature, and then analyze the temperature adaptability of the thermal protector; S4. Protection performance evaluation: During the maximum load current test of the thermal protector, the triggering time and recovery time of each test of the thermal protector are monitored, and the protection performance evaluation coefficient of the thermal protector is analyzed; S5. State analysis: Get the state parameters of the thermal protector under the maximum load current, and then analyze the working stability of the thermal protector. The state parameters include the temperature qualification level and the vibration frequency. S6. Anti-interference capability analysis: Obtain the voltage and current values ​​of the thermal protector at each intensity of electromagnetic radiation under the maximum carrying current, as well as the voltage and current values ​​of electromagnetic radiation at each frequency, and then analyze the anti-interference capability of the thermal protector; S7. Comprehensive analysis: Based on the thermal protector's action current consistency, temperature adaptability, protection performance evaluation coefficient, working stability, and anti-interference ability, the comprehensive performance evaluation index of the thermal protector under the maximum carrying current is obtained and feedback is provided.

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