阅读说明：本技术 一种基于电气自动化设备的测试系统 (Test system based on electric automation equipment ) 是由 张立平 朱志伟 李伟 何丽娟 苏蓉 于 2021-08-19 设计创作，主要内容包括：本发明涉及一种基于电气自动化设备的测试系统,涉及数据处理技术领域,包括,采集模块,用以采集电气自动化设备在测试周期的参数数据,其与分析模块连接；所述分析模块,用以对采集到的参数数据进行数据分析,其与判断模块连接；所述判断模块,用以根据数据分析结果对所述电气自动化设备的安全性能做出判定,其与输出模块连接；所述输出模块,用以对安全性能判定结果进行输出；所述分析模块的数据分析过程包括,首先对获取的耐压测试数据进行分析,所述分析模块根据接入试验电压后设备的电流增加量判断设备的绝缘性能,并以此设定第一危险系数。本发明所述系统通过进行精确数据分析有效提高了电气自动化设备的测试效率。(The invention relates to a test system based on electric automation equipment, which relates to the technical field of data processing, and comprises an acquisition module, an analysis module and a control module, wherein the acquisition module is used for acquiring parameter data of the electric automation equipment in a test period and is connected with the analysis module; the analysis module is used for carrying out data analysis on the acquired parameter data and is connected with the judgment module; the judgment module is used for judging the safety performance of the electric automation equipment according to the data analysis result and is connected with the output module; the output module is used for outputting the safety performance judgment result; the data analysis process of the analysis module comprises the steps of firstly analyzing the obtained withstand voltage test data, judging the insulation performance of the equipment by the analysis module according to the current increment of the equipment after test voltage is accessed, and setting a first danger coefficient according to the current increment. The system of the invention effectively improves the testing efficiency of the electric automation equipment by carrying out accurate data analysis.)

1. A test system based on electrical automation equipment, comprising:

the acquisition module is used for acquiring parameter data of the electrical automation equipment in a test period and is connected with the analysis module;

the analysis module is used for carrying out data analysis on the acquired parameter data and is connected with the judgment module;

the judgment module is used for judging the safety performance of the electric automation equipment according to the data analysis result and is connected with the output module;

the output module is used for outputting the safety performance judgment result;

the data analysis process of the analysis module comprises the steps of firstly analyzing the obtained withstand voltage test data, judging the insulation performance of the equipment by the analysis module according to the current increment delta A of the equipment after test voltage is accessed, and setting a first risk coefficient according to the current increment delta A; after the first danger coefficient is set, the analysis module analyzes the obtained insulation resistance test data, and the analysis module judges the insulation strength of the insulation resistance according to the resistance value R of the insulation resistance in the equipment after the insulation resistance is connected with the test voltage and sets a second danger coefficient according to the resistance value R; after the second danger coefficient is set, the analysis module analyzes the acquired test data of the ground resistance, and judges the safety of the ground resistance according to the resistance value B of the ground resistance in the equipment after the test voltage is switched on, and sets a third danger coefficient according to the safety; after the third danger coefficient is set, the analysis module analyzes the acquired contact current test data, and judges the safety of the contact current according to the current F flowing through the human body when the human body is in contact with the equipment, and sets a fourth danger coefficient according to the safety;

the judgment process of the judgment module comprises the steps of calculating an equipment risk index m according to each risk coefficient, and judging the safety of the equipment according to the calculated equipment risk index m; when equipment safety judgment is carried out, the judgment module adjusts the calculated equipment danger index m according to the historical test times H of the equipment, and after the adjustment is finished, the judgment module corrects the adjusted equipment danger index according to a periodic test result on the equipment.

2. The electrical automation equipment-based test system of claim 1, wherein, when analyzing the obtained voltage withstand test data, the analysis module compares an increase Δ A of a current of the equipment within a time t1 after the test voltage is applied with a preset current increase Δ A0, and sets Δ A-Ab-Aa, Ab is a current of the equipment after the test voltage is applied for a time t1, Aa is a current passed by the equipment when the standard voltage is applied, and determines the insulation performance of the equipment according to the comparison result, wherein,

when the delta A is less than or equal to the delta A0, the analysis module judges that insulation breakdown does not occur in the equipment, the insulation performance of the equipment meets the requirement, and at the moment, the first risk coefficient is set to be m 1-0;

when Δ a > [ Δ a0, the analysis module determines that insulation breakdown has occurred in the device and that there is a defect in the insulation performance of the device, and sets the first risk factor to m1 ═ Δ a- [ Δ ] a 0/[ Δ ] a 0.

3. The electrical automation device-based test system of claim 2, wherein the analysis module compares a resistance value R of the insulation resistor in the device after a time of switching on a test voltage t2 with a preset standard resistance value R0 and determines the insulation strength of the insulation resistor according to the comparison result, when analyzing the obtained insulation resistance test data,

when R is not more than R0, the analysis module judges that the insulation strength of the insulation resistance does not meet the requirement, when the equipment does not generate insulation breakdown, the analysis module sets the second risk coefficient to be m2 ═ R0-R)/R, and when the equipment generates insulation breakdown, the analysis module sets the second risk coefficient to be m2 ═ m1+ (R0-R)/R ] × 0.5;

when R > R0, the analysis module determines that the insulation strength of the insulation resistance satisfies the requirement, and sets the second risk factor to m2 equal to 0.

4. The electrical automation device-based test system of claim 3, wherein the analysis module compares a resistance value B of the device after the ground resistance is turned on for a test voltage t3 with a preset resistance value B0 and determines safety of the ground resistance according to the comparison result, when analyzing the obtained ground resistance test data, wherein,

when B is less than or equal to B0, the analysis module judges that the safety of the grounding resistance meets the requirement, and at the moment, the third risk coefficient is set to be m 3-0;

when B is larger than B0, the analysis module judges that the safety of the grounding resistance is not satisfactory, and sets the third risk coefficient to be m3 ═ B-B0)/B0.

5. The electrical automation device-based test system of claim 4, wherein the analysis module compares a current F flowing through a human body when the human body is in contact with the device with a preset safety current F0 and determines safety of the contact current according to a comparison result, when analyzing the obtained contact current test data,

when F is less than or equal to F0, the analysis module judges that the safety of the contact current meets the requirement, and at the moment, the fourth risk coefficient is set to be m 4-0;

when F > F0, the analysis module determines that the safety of the contact current is not satisfactory, and sets the fourth risk coefficient to m4 ═ F-F0)/F0.

6. The electrical automation device-based test system of claim 5, wherein the analysis module calculates a device risk index m according to each risk coefficient after setting each risk coefficient, sets m to 0.4 xm 1+0.3 xm 2+0.2 xm 3+0.1 xm 4, compares the calculated device risk index m with a preset device risk index m0, and determines the safety of the device according to the comparison result, wherein,

when m is 0, the judgment module judges that the equipment is safe;

when m is more than 0 and less than or equal to m0, the judgment module judges that the equipment has low risk and needs to be maintained;

when m is larger than m0, the judgment module judges that the equipment has high danger and cannot be used continuously.

7. The electrical automation device-based test system of claim 6, wherein the judgment module obtains historical testing times H of the device when performing device safety judgment, compares the obtained historical testing times H with a preset testing time H0, and selects a corresponding adjustment coefficient according to the comparison result to adjust the calculated device risk index m, wherein,

when the judgment module selects the ith adjustment coefficient ai to adjust the equipment risk index m, setting i to be 1 and 2, setting the adjusted equipment risk index to be m ', setting m' to be m multiplied by ai, wherein,

when H is more than 0 and less than or equal to H0, the judgment module selects a first adjustment coefficient a1 to adjust m, a1 is a preset value, and a1 is more than 1 and less than 1.1;

when H > H0, the judging module selects a second adjusting coefficient a2 to adjust m, and sets a2 to a1 × [1+ (H-H0)/H0 ].

8. The electrical automation device-based test system of claim 7 wherein the determination module, after adjusting the device risk index m, modifies the adjusted device risk index m' according to a periodic test result on the device, wherein,

if the equipment safety is judged in the last test period, the judgment module does not carry out correction;

and if the equipment is judged to have low risk in the previous test period, the judgment module selects a correction coefficient b to correct m ', the corrected equipment risk index is m ', m is set to be m ' multiplied by b, and 1 < b < 1.2.

Technical Field

The invention relates to the technical field of data processing, in particular to a test system based on electric automation equipment.

Background

An electric automation device is a general term for devices such as a generator, a transformer, a power line, and a circuit breaker in a power system. The important role played by electric power in our life and production is not ignored, brings great convenience to our life, and becomes an important energy source in our production and life. The most critical factor in a power plant that allows for the proper operation and delivery of electricity is the electrical automation equipment.

The electric automation equipment is easy to have electric accidents in the using process, and can be divided into short-circuit accidents, disconnection accidents, grounding accidents, electric leakage accidents and the like according to the circuit conditions when the accidents happen, and the statistical data of the electric accidents show that the electric automation equipment has poor installation quality due to the defect of the structure and can not meet the safety requirements, so that the occupied proportion of the accidents is large.

Therefore, in order to ensure personal and equipment safety, periodic tests need to be performed on the electrical automation equipment, and in the prior art, when different types of tests are performed on the electrical automation equipment, the different types of test data of the electrical automation equipment cannot be comprehensively and accurately analyzed, so that the test efficiency of the electrical automation equipment is affected.

Disclosure of Invention

Therefore, the invention provides a test system based on electrical automation equipment, which is used for solving the problem of low test efficiency of the electrical automation equipment caused by the fact that different test results of the electrical automation equipment cannot be accurately analyzed in the prior art.

To achieve the above object, the present invention provides a test system based on an electrical automation device, comprising,

the acquisition module is used for acquiring parameter data of the electrical automation equipment in a test period and is connected with the analysis module;

the analysis module is used for carrying out data analysis on the acquired parameter data and is connected with the judgment module;

the judgment module is used for judging the safety performance of the electric automation equipment according to the data analysis result and is connected with the output module;

the output module is used for outputting the safety performance judgment result;

the data analysis process of the analysis module comprises the steps of firstly analyzing the obtained withstand voltage test data, judging the insulation performance of the equipment by the analysis module according to the current increment delta A of the equipment after test voltage is accessed, and setting a first risk coefficient according to the current increment delta A; after the first danger coefficient is set, the analysis module analyzes the obtained insulation resistance test data, and the analysis module judges the insulation strength of the insulation resistance according to the resistance value R of the insulation resistance in the equipment after the insulation resistance is connected with the test voltage and sets a second danger coefficient according to the resistance value R; after the second danger coefficient is set, the analysis module analyzes the acquired test data of the ground resistance, and judges the safety of the ground resistance according to the resistance value B of the ground resistance in the equipment after the test voltage is switched on, and sets a third danger coefficient according to the safety; after the third danger coefficient is set, the analysis module analyzes the acquired contact current test data, and judges the safety of the contact current according to the current F flowing through the human body when the human body is in contact with the equipment, and sets a fourth danger coefficient according to the safety;

the judgment process of the judgment module comprises the steps of calculating an equipment risk index m according to each risk coefficient, and judging the safety of the equipment according to the calculated equipment risk index m; when equipment safety judgment is carried out, the judgment module adjusts the calculated equipment danger index m according to the historical test times H of the equipment, and after the adjustment is finished, the judgment module corrects the adjusted equipment danger index according to a periodic test result on the equipment.

Further, when analyzing the obtained voltage withstanding test data, the analysis module compares an increase Δ a of the current of the equipment within the time t1 after the test voltage is switched in with a preset current increase Δ a0, and sets Δ a-Ab-Aa, Ab is the current of the equipment after the time t1 after the test voltage is switched in, Aa is the current passed by the equipment when the standard voltage is switched in, and determines the insulation performance of the equipment according to the comparison result, wherein,

when the delta A is less than or equal to the delta A0, the analysis module judges that insulation breakdown does not occur in the equipment, the insulation performance of the equipment meets the requirement, and at the moment, the first risk coefficient is set to be m 1-0;

when Δ a > [ Δ a0, the analysis module determines that insulation breakdown has occurred in the device and that there is a defect in the insulation performance of the device, and sets the first risk factor to m1 ═ Δ a- [ Δ ] a 0/[ Δ ] a 0.

Further, when analyzing the obtained insulation resistance test data, the analysis module compares the resistance value R of the insulation resistance in the device after the time t2 for switching on the test voltage with a preset standard resistance value R0, and determines the insulation strength of the insulation resistance according to the comparison result, wherein,

when R is not more than R0, the analysis module judges that the insulation strength of the insulation resistance does not meet the requirement, when the equipment does not generate insulation breakdown, the analysis module sets the second risk coefficient to be m2 ═ R0-R)/R, and when the equipment generates insulation breakdown, the analysis module sets the second risk coefficient to be m2 ═ m1+ (R0-R)/R ] × 0.5;

when R > R0, the analysis module determines that the insulation strength of the insulation resistance satisfies the requirement, and sets the second risk factor to m2 equal to 0.

Further, when analyzing the obtained ground resistance test data, the analysis module compares the resistance value B of the ground resistance in the device after the time t3 when the ground resistance is connected with the test voltage with the preset resistance value B0, and judges the safety of the ground resistance according to the comparison result, wherein,

when B is less than or equal to B0, the analysis module judges that the safety of the grounding resistance meets the requirement, and at the moment, the third risk coefficient is set to be m 3-0;

when B is larger than B0, the analysis module judges that the safety of the grounding resistance is not satisfactory, and sets the third risk coefficient to be m3 ═ B-B0)/B0.

Further, when analyzing the obtained contact current test data, the analysis module compares the current F flowing through the human body when the human body contacts the device with a preset safe current F0, and determines the safety of the contact current according to the comparison result, wherein,

when F is less than or equal to F0, the analysis module judges that the safety of the contact current meets the requirement, and at the moment, the fourth risk coefficient is set to be m 4-0;

when F > F0, the analysis module determines that the safety of the contact current is not satisfactory, and sets the fourth risk coefficient to m4 ═ F-F0)/F0.

Further, after the analysis module sets each risk coefficient, the judgment module calculates an equipment risk index m according to each risk coefficient, sets m to be 0.4 × m1+0.3 × m2+0.2 × m3+0.1 × m4, compares the calculated equipment risk index m with a preset equipment risk index m0, and judges the safety of the equipment according to the comparison result, wherein,

when m is 0, the judgment module judges that the equipment is safe;

when m is more than 0 and less than or equal to m0, the judgment module judges that the equipment has low risk and needs to be maintained;

when m is larger than m0, the judgment module judges that the equipment has high danger and cannot be used continuously.

Further, when the judgment module judges the safety of the equipment, the judgment module obtains the historical test times H of the equipment, compares the obtained historical test times H with the preset test times H0, and selects a corresponding adjustment coefficient according to the comparison result to adjust the calculated equipment risk index m, wherein,

when the judgment module selects the ith adjustment coefficient a i to adjust the equipment risk index m, setting i to be 1 and 2, setting the adjusted equipment risk index to be m ', and setting m' to be m × a i, wherein,

when H is more than 0 and less than or equal to H0, the judgment module selects a first adjustment coefficient a1 to adjust m, a1 is a preset value, and a1 is more than 1 and less than 1.1;

when H > H0, the judging module selects a second adjusting coefficient a2 to adjust m, and sets a2 to a1 × [1+ (H-H0)/H0 ].

Further, after the judgment module finishes the adjustment of the equipment risk index m, the judgment module corrects the adjusted equipment risk index m' according to a periodic test result on the equipment, wherein,

if the equipment safety is judged in the last test period, the judgment module does not carry out correction;

and if the equipment is judged to have low risk in the previous test period, the judgment module selects a correction coefficient b to correct m ', the corrected equipment risk index is m ', m is set to be m ' multiplied by b, and 1 < b < 1.2.

Compared with the prior art, the system has the advantages that the system analyzes data by acquiring voltage-resistance test data, insulation resistance test data, grounding resistance test data and contact current test data of the equipment to analyze the data in multiple aspects, so as to ensure the accuracy of a final judgment result, the analysis module sets a first danger coefficient through the voltage-resistance test data, sets a second danger coefficient through the insulation resistance test data, sets a third danger coefficient through the grounding resistance test data, sets a fourth danger coefficient through the contact current test data, sets each danger coefficient through accurate data analysis and calculation, can effectively ensure the accuracy of different danger coefficients, and the judgment module calculates the equipment danger index according to each danger coefficient and calculates through a weighted average mode, the accuracy of the calculated result is effectively ensured, so that the accuracy of equipment safety judgment is further ensured, the testing efficiency of the equipment is further improved, the judgment module adjusts the calculated equipment danger index m according to the historical test times H of the equipment after calculating the equipment danger index, the longer the equipment is used when the H is larger, the longer the equipment danger index is proved, so that the equipment danger index is increased, the accuracy of the calculated result is ensured, the influence of equipment abrasion on the calculated value is prevented, the calculation of the equipment danger index is corrected according to the last test result of the equipment after the judgment module finishes the adjustment, the accuracy of the calculated result is ensured, when the equipment is tested and judged to have low danger last time, the equipment is proved to be maintained, the potential risk exists, and the accuracy of the calculated result can be further improved through the correction, the accuracy of judging the safety of the equipment is improved, and therefore the testing efficiency of the equipment is further improved.

Particularly, the analysis module compares the current increment delta A of the equipment within t1 time after the test voltage is connected with the preset current increment delta A0 to judge the insulation performance of the equipment, so that the accuracy of judging the insulation performance of the equipment is effectively ensured, the accuracy of judging the safety of the equipment is further ensured, and the test efficiency is further improved.

Particularly, the analysis module judges the insulation strength of the insulation resistor by comparing the resistance value R of the insulation resistor in the equipment after the time of switching on the test voltage t2 with the preset standard resistance value R0, so that the accuracy of judging the insulation strength of the insulation resistor is effectively ensured, the accuracy of judging the safety of the equipment is further ensured, and the test efficiency is further improved.

Particularly, the analysis module compares the resistance value B of the equipment after the grounding resistor is connected with the test voltage t3 with the preset resistance value B0 to judge the safety of the grounding resistor, so that the accuracy of judging the safety of the grounding resistor is effectively ensured, the accuracy of judging the safety of the equipment is further ensured, and the test efficiency is further improved.

Particularly, the analysis module judges the safety of the contact current by comparing the current F flowing through the human body when the human body is in contact with the equipment with the preset safety current F0, so that the accuracy of judging the safety of the contact current is effectively ensured, the accuracy of judging the safety of the equipment is further ensured, and the test efficiency is further improved.

Particularly, the judgment module judges the safety of the equipment by comparing the calculated equipment risk index m with the preset equipment risk index m0, so that the accuracy of judging the safety of the equipment is further ensured, and the test efficiency is further improved.

Particularly, the judgment module compares the obtained historical test times H with the preset test times H0 to select a corresponding adjustment coefficient to adjust the calculated equipment risk index m, and further guarantees the accuracy of equipment safety judgment through adjustment, so that the test efficiency is further improved.

Particularly, the judgment module corrects the adjusted equipment risk index m' according to a periodic test result on the equipment, and the accuracy of equipment safety judgment is further ensured by correcting, so that the test efficiency is further improved.

Drawings

Fig. 1 is a structural framework diagram of a test system based on an electrical automation device according to the present embodiment.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, a schematic structural diagram of a test system based on an electrical automation device according to the present embodiment is shown, the system includes,

the acquisition module is used for acquiring parameter data of the electrical automation equipment in a test period and is connected with the analysis module;

the analysis module is used for carrying out data analysis on the acquired parameter data and is connected with the judgment module;

the judgment module is used for judging the safety performance of the electric automation equipment according to the data analysis result and is connected with the output module;

and the output module is used for outputting the safety performance judgment result.

Specifically, the electrical automation equipment in this embodiment includes, but is not limited to, a PLC, a relay, a signal switch, a frequency converter, a circuit breaker, a solenoid valve, a capacitor, an inductor, and the like, and the parameter data in this embodiment includes, but is not limited to, voltage withstanding test data, insulation resistance test data, ground resistance test data, contact current test data, and the like; in the withstand voltage test process of the embodiment, test voltage is applied to equipment and is continued for a preset time, and when current in the equipment rapidly increases in an out-of-control mode due to the application of the test voltage, namely the current cannot be limited by insulation, insulation breakdown is considered to have occurred; in the insulation resistance testing process of this embodiment, a test voltage is applied to an insulation resistance and the insulation resistance is continued for a preset time, and a resistance value of the insulation resistance after the preset time is detected to determine the insulation strength between electrical isolation components; in the process of testing the grounding resistance, a preset test voltage is connected to a circuit of the grounding resistance, the current in the circuit is ensured to be within a preset range and lasts for a preset time, and the resistance value of the grounding resistance is calculated according to the voltage drop; the contact current testing process is to measure the magnitude of the current flowing through the human body when the artificial contact path is used.

Specifically, the analysis module firstly analyzes the obtained voltage withstanding test data, compares an increase Δ a of current of the equipment within time t1 after the test voltage is connected with a preset current increase Δ a0, sets Δ a-Ab-Aa, Ab is the current of the equipment after time t1 after the test voltage is connected, Aa is the current passed by the equipment when the standard voltage is connected, and judges the insulation performance of the equipment according to the comparison result, wherein,

when the delta A is less than or equal to the delta A0, the analysis module judges that insulation breakdown does not occur in the equipment, the insulation performance of the equipment meets the requirement, and at the moment, the first risk coefficient is set to be m 1-0;

when Δ a > [ Δ a0, the analysis module determines that insulation breakdown has occurred in the device and that there is a defect in the insulation performance of the device, and sets the first risk factor to m1 ═ Δ a- [ Δ ] a 0/[ Δ ] a 0.

Specifically, after the first risk factor is set, the analysis module analyzes the obtained insulation resistance test data, compares a resistance value R of the insulation resistance in the device after the insulation resistance is switched on for a test voltage t2 with a preset standard resistance value R0, and determines the insulation strength of the insulation resistance according to the comparison result, wherein,

when R is not more than R0, the analysis module judges that the insulation strength of the insulation resistance does not meet the requirement, when the equipment does not generate insulation breakdown, the analysis module sets the second risk coefficient to be m2 ═ R0-R)/R, and when the equipment generates insulation breakdown, the analysis module sets the second risk coefficient to be m2 ═ m1+ (R0-R)/R ] × 0.5;

when R > R0, the analysis module determines that the insulation strength of the insulation resistance satisfies the requirement, and sets the second risk factor to m2 equal to 0.

Specifically, the analysis module of this embodiment determines the insulation performance of the device according to an increase Δ a of the current in time t1, and sets a first risk coefficient, when Δ a is greater than a preset value, the analysis module sets the first risk coefficient according to a difference value, the larger the difference value is, the larger the first risk coefficient is, and the accuracy of the safety determination of the device is ensured by performing accurate calculation, so as to improve the testing efficiency of the device, in this embodiment, when a second risk coefficient is set, the analysis module is set according to a resistance value R after the insulation resistance is turned on for a test voltage t2, when the resistance value R is less than or equal to the preset value, the insulation capability is weak, and if no insulation breakdown occurs, the second risk coefficient is set according to the resistance value R, if insulation breakdown occurs, calculation is performed according to the first risk coefficient, so as to improve the accuracy of the calculation result, therefore, the accuracy of equipment safety judgment is ensured, and the test efficiency of the equipment is improved.

Specifically, after the second risk factor is set, the analysis module analyzes the obtained ground resistance test data, compares the resistance value B of the ground resistance in the device after the test voltage t3 is switched on with a preset resistance value B0, and determines the safety of the ground resistance according to the comparison result, wherein,

when B is less than or equal to B0, the analysis module judges that the safety of the grounding resistance meets the requirement, and at the moment, the third risk coefficient is set to be m 3-0;

when B is larger than B0, the analysis module judges that the safety of the grounding resistance is not satisfactory, and sets the third risk coefficient to be m3 ═ B-B0)/B0.

Specifically, after the third risk factor is set, the analysis module analyzes the acquired contact current test data, compares the current F flowing through the human body when the human body contacts the device with a preset safety current F0, and determines the safety of the contact current according to the comparison result, wherein,

when F is less than or equal to F0, the analysis module judges that the safety of the contact current meets the requirement, and at the moment, the fourth risk coefficient is set to be m 4-0;

when F > F0, the analysis module determines that the safety of the contact current is not satisfactory, and sets the fourth risk coefficient to m4 ═ F-F0)/F0.

Specifically, after the analysis module obtains each risk coefficient, the judgment module calculates an equipment risk index m according to each risk coefficient, sets m to be 0.4 × m1+0.3 × m2+0.2 × m3+0.1 × m4, compares the calculated equipment risk index m with a preset equipment risk index m0, and judges the safety of the equipment according to the comparison result, wherein,

when m is 0, the judgment module judges that the equipment is safe;

when m is more than 0 and less than or equal to m0, the judgment module judges that the equipment has low risk and needs to be maintained;

when m is larger than m0, the judgment module judges that the equipment has high danger and cannot be used continuously.

Specifically, when the equipment risk index m is calculated, the judgment module weights each risk coefficient according to the importance degree of different tests to ensure that the obtained equipment risk index is high in accuracy, compares the calculated equipment risk index m with a preset value, judges the safety of the equipment according to the comparison result, and can further ensure the accuracy of the judgment result through comparison, so that the test efficiency of the equipment is improved.

Specifically, when the judgment module judges the safety of the equipment, the judgment module obtains the historical test times H of the equipment, compares the obtained historical test times H with the preset test times H0, and selects a corresponding adjustment coefficient according to the comparison result to adjust the calculated equipment risk index m, wherein,

when the judgment module selects the ith adjustment coefficient a i to adjust the equipment risk index m, setting i to be 1 and 2, setting the adjusted equipment risk index to be m ', and setting m' to be m × a i, wherein,

when H is more than 0 and less than or equal to H0, the judgment module selects a first adjustment coefficient a1 to adjust m, a1 is a preset value, and a1 is more than 1 and less than 1.1;

when H > H0, the judging module selects a second adjusting coefficient a2 to adjust m, and sets a2 to a1 × [1+ (H-H0)/H0 ].

Specifically, after the judgment module finishes the adjustment of the equipment risk index m, the judgment module corrects the adjusted equipment risk index m' according to a periodic test result on the equipment, wherein,

if the equipment safety is judged in the last test period, the judgment module does not carry out correction;

and if the equipment is judged to have low risk in the previous test period, the judgment module selects a correction coefficient b to correct m ', the corrected equipment risk index is m ', m is set to be m ' multiplied by b, and 1 < b < 1.2.

Specifically, when the determining module determines the safety of the device, after the device risk index m is calculated, the determining module adjusts the device risk index m according to the historical test times H of the device, and the larger the historical test times H, the longer the device is used, the more the device is worn, so the device risk index m needs to be increased for prevention, and meanwhile, when the adjusting coefficient is set, when H is less than or equal to the preset value, the adjusting coefficient is adjusted by a fixed coefficient, and if H is greater than the preset value, the adjusting coefficient is further calculated according to a difference between H and the preset value, so as to ensure the accuracy of the adjusted device risk index m, so as to improve the accuracy of determining the safety of the device, so as to further improve the test efficiency, and after the adjustment is completed, the determining module corrects the adjusted device risk index according to the test result of the previous test period of the device, the accuracy of the equipment danger index is further improved, if the equipment is judged to have low danger in the last test period, the equipment is proved to be maintained, and therefore the accuracy of safety judgment of the equipment can be further guaranteed by increasing the equipment danger index, and the test efficiency of the equipment is further improved.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.