Arc contact multi-factor coupling test device and method and service performance evaluation method

Abstract

The invention relates to an arc contact multi-factor coupling test device and method and a service performance evaluation method, and the arc contact multi-factor coupling test device comprises a multi-environment coupling test box body which simulates the use environment of an arc contact; the contact arc extinguishing test platform is arranged in the multi-environment coupling test box body and is used for fixing the arc contact so as to simulate the large-current arc breaking process of the contact; the electrical parameter control system is arranged on one side or multiple sides of the multi-environment coupling test box body and used for controlling electrical parameters in the test process; and the control and data acquisition module is respectively connected with the multi-environment coupling test box body, the contact arc extinguishing test platform and the electrical parameter control system and is used for setting test parameters and acquiring test data. According to the test equipment, an electric, thermal, mechanical and environmental multi-field coupling technology is adopted, a highly-simulated test platform is constructed, and the operation state of the contact under the actual working condition can be comprehensively and accurately evaluated.

Description

Technical Field

[0001] The present invention belongs to the field of electrical materials, and in particular relates to an arc contact multi-factor coupling testing device and method, and a service performance evaluation method. Background Art

[0002] With the large-scale integration of clean renewable energy into the grid, the problem of excessive short-circuit currents in areas with dense power and load concentrations has become a prominent factor hindering my country's grid capacity expansion and green development. The hidden danger of insufficient circuit breaker interrupting capacity has become increasingly prominent, becoming a critical technical issue urgently needed to be addressed in grid development. Arcing contacts are core components of high-voltage, high-capacity SF6 circuit breakers, largely determining their interrupting capacity and lifespan. They are a key factor in the development of 63kA / 80kA high-voltage, high-capacity SF6 circuit breakers.

[0003] During the opening and closing process, SF6 circuit breakers are subject to inrush current erosion several times higher than the rated current, mechanical wear between the moving and static arcing contacts, and erosion by SF6. This causes contact deformation and generates metal vapor, compromising the insulation performance of the arc extinguishing chamber. Therefore, arcing contact materials must possess high current-breaking capacity, withstand voltage, low contact resistance, good resistance to welding, wear resistance, low interruption current, and high mechanical strength. Evaluating arcing contact performance has become a key technical issue.

[0004] At present, some research institutions have the basic force, heat and electrical performance testing capabilities, but in actual use, there is no research equipment and evaluation method for the contact wear and electrical contact heating characteristics of arc contacts under surge erosion under extreme service conditions such as equivalent high and low temperatures. Only a few research institutes and universities have the ablation test capabilities of contact material samples, which cannot meet the evaluation requirements of arc contacts. Contact performance is often verified through type tests of circuit breakers. The type test verification process is complicated and costly. There is an urgent need for a mature service performance test equipment that meets the evaluation needs of arc contacts to achieve iterative upgrades of arc contact performance evaluation technology. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that there is no mature service performance test equipment in the prior art and it cannot meet the demand for arc contact evaluation. The present invention provides an arc contact multi-factor coupling test equipment, comprising:

[0006] Multi-environment coupling test box to simulate the operating environment of arc contacts;

[0007] A contact arc extinguishing test platform is provided in the multi-environment coupling test box, and is used to fix the arc contact to simulate the high current arc breaking process of the contact;

[0008] An electrical parameter control system, provided on one or more sides of the multi-environment coupling test box, for controlling electrical parameters during the test process;

[0009] The control and data acquisition module is connected to the multi-environment coupling test box, the contact arc extinguishing test platform, and the electrical parameter control system respectively, and is used to set test parameters and collect test data.

[0010] Furthermore, the contact arc extinguishing test platform includes a sample table for fixing arc contact samples, an air blowing simulation system and a reciprocating operating mechanism;

[0011] The air blowing simulation system and the reciprocating operating mechanism are electrically connected to the electrical parameter control system and the control and data acquisition module respectively;

[0012] The air outlet of the air blowing simulation system is aligned with the sample stage, which is used to simulate the air blowing effect during the circuit breaker opening and closing process; the reciprocating operating mechanism is connected to the sample stage to control the movement of the arc contact sample, which is used to simulate the mechanical impact of contact opening and closing.

[0013] Furthermore, a detachable clamp is provided on the sample stage, and the opening distance of the clamp can be adjusted.

[0014] Furthermore, the air blowing simulation system includes a transparent nozzle.

[0015] Furthermore, the contact arc extinguishing test platform also includes an observation system, which includes a high-frequency pulse laser lighting system and a high-speed camera arranged on one side of the arc contact. The high-frequency pulse laser lighting system is used to provide lighting and eliminate arc self-luminous interference, and the high-speed camera is used to record the spatiotemporal distribution of the interaction between the arc and the contact.

[0016] Furthermore, the multi-environment coupling test box includes a temperature and humidity control module, and the temperature and humidity control module is used to provide the temperature and humidity environment required for the test.

[0017] Furthermore, the electrical parameter control system includes a current generator, a resistance testing module and a rectification and protection unit; the output end of the current generator is connected to the contact arc extinguishing test platform, the resistance testing module tests the contact resistance between contacts in real time, and the rectification and protection unit is connected to the current generator.

[0018] Furthermore, the rectification and protection unit includes a forced air-cooled rectification tube group.

[0019] Based on the same inventive concept, the present invention also provides

[0020] An arc contact testing method is characterized by using the arc contact multi-factor coupling testing device to perform the test, comprising:

[0021] Set test parameters;

[0022] Simulate the use environment of arc contacts;

[0023] Electrical parameters to simulate the arc contact usage process;

[0024] Arcing contacts reciprocate;

[0025] Collect test data.

[0026] Based on the same inventive concept, the present invention also provides a method for evaluating the service characteristics of an arc contact, comprising the following steps:

[0027] Measure the size and original mass of arc contact samples;

[0028] Testing the arc contact sample using the test method to obtain test data;

[0029] Evaluate arc contact performance based on test data, sample size, original mass and residual mass, determine whether it has failed based on failure criteria, and estimate the remaining life;

[0030] The arc contact performance is evaluated using arc contact performance parameters such as mass loss, residual tensile strength, hardness, and contact resistance.

[0031] Furthermore, determining the remaining lifespan includes:

[0032] Whether the arc contact sample has failed is determined according to a failure judgment standard. If it has not failed, the remaining life is calculated. If it has failed, the remaining life is 0.

[0033] Furthermore, the failure judgment standard is

[0034] Mass loss Δm max ≥20g; and / or

[0035] Residual tensile strength σ res ≤0.7σ b and / or

[0036] Hardness reduction ΔHV ≥ 20%; and / or

[0037] Contact resistance jump R c ≥2R c0 ;

[0038] Where, Δm max is the maximum mass loss of the arcing contact during the test, σ b is the tensile strength, σ res is the residual tensile strength, ΔHV is the percentage of hardness reduction based on the initial hardness, R c0 is the initial contact resistance, R c is the contact resistance of the sample after testing.

[0039] Furthermore, the remaining life is determined by the following calculation formula:

[0040]

[0041] Among them, N 剩余 is the remaining life, Δm max is the maximum mass loss of the arc contact during the test (mg), Δm 累计 is the cumulative mass loss of the arc contact during the test (mg), is the average mass loss rate (mg / C), is the average arc charge (C);

[0042] L c is the crack length (μm), L crit is the critical crack length (μm), is the average crack growth rate (μm / time);

[0043] σ b is the tensile strength (MPa), σ res is the residual tensile strength (MPa), Δσ cycle is the strength degradation in a single cycle (MPa / time).

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention provides a multi-factor coupling test device for arc contacts, which adopts a multi-environment coupling test box to simulate the use environment of the arc contacts, and adopts a contact arc extinguishing test platform to simulate the actual use conditions, thereby constructing a highly simulated test platform, which can comprehensively and accurately evaluate the operating status of the contacts under actual working conditions. At the same time, an electrical parameter control system is adopted to regulate multiple key parameters, and a control and data acquisition module realizes real-time data acquisition and monitoring, which effectively makes up for the deficiency of the existing technology that only single-factor testing can be carried out and cannot meet the requirements of real-type contact testing.

[0046] The proposed arcing contact service characteristics assessment method uses arcing contact performance parameters such as mass loss, residual tensile strength, hardness, and contact resistance to accurately quantify ablation parameters and predict service life based on failure criteria. This method not only avoids the high costs and complex processes associated with traditional destructive testing but also significantly improves prediction accuracy and assessment efficiency, providing a scientific basis for equipment maintenance and quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the structure of the arc contact multi-factor coupling test equipment according to embodiment 1 of the present invention;

[0048] Figure 2 Schematic diagram of the appearance of an arc contact multi-factor coupling test device according to Example 1 of the present invention;

[0049] Figure 3 This is a schematic diagram of a test area of ​​an arc contact multi-factor coupling test device according to Example 1 of the present invention;

[0050] 1. Chamber door; 2. Test area; 201. High and low temperature test chamber; 202. Reciprocating operating mechanism; 203. Sample table; 204. Fixture; 3. Machine room; 4. Door lock; 5. Window; 6. Lighting; 7. Test hole; 8. Fan motor; 9. Operation panel. DETAILED DESCRIPTION

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0052] Example 1

[0053] like Figure 1 As shown, the arc contact multi-factor coupling test equipment of this embodiment includes: a multi-environment coupling test box, which simulates the use environment of the arc contact; a contact arc extinguishing test platform, which is arranged in the multi-environment coupling test box and fixes the arc contact to simulate the contact high-current arc breaking process; an electrical parameter control system, which is arranged on one side or multiple sides of the multi-environment coupling test box and is used to monitor the test process parameters in real time; a control and data acquisition module, which is respectively connected to the multi-environment coupling test box, the contact arc extinguishing test platform, and the electrical parameter control system, and is used to set test parameters and collect test data.

[0054] like Figure 2 The figure shows the appearance of the test equipment of this embodiment, including a box door 1, a test area 2, a machine room 3, a door lock 4, a window 5, a lighting 6, a test hole 7, a fan motor 8 and an operation panel 9.

[0055] The contact arc extinguishing test platform includes a sample table for fixing the arc contact sample, an air blowing simulation system and a reciprocating operating mechanism; the air blowing simulation system and the reciprocating operating mechanism are electrically connected to the electrical parameter control system and the control and data acquisition module respectively; the air outlet of the air blowing simulation system is aligned with the sample table to simulate the air blowing effect during the circuit breaker opening and closing process; the reciprocating operating mechanism is connected to the sample table to control the movement of the arc contact sample and simulate the mechanical impact of contact opening and closing.

[0056] like Figure 3 As shown, this is the test area of ​​the test equipment of this embodiment, wherein the high and low temperature test chamber 201 provides the environment required for the test, the sample table 203 is used to fix the arc contact sample, and the reciprocating operating mechanism 202 is connected to the sample table 203 to control the movement of the arc contact sample to simulate the mechanical impact of contact opening and closing.

[0057] The sample table 203 is provided with a detachable clamp 204, which is detachably fixed to the sample 203 through a base. The clamp 204 is an annular clamp with an opening. The arc contact sample passes through the annular clamp and is locked by bolts. The annular clamp can adjust the opening distance by adjusting the size of the opening.

[0058] The detachable fixture can be used to adjust the opening distance, replace the contacts or gas according to the observation method, observation angle, etc.

[0059] The air blowing simulation system includes a transparent nozzle. Gas is injected through a high-pressure gas injection device and ejected from the transparent nozzle, controlled by a flow controller and pressure sensor. The transparent nozzle in this embodiment is made of highly heat-resistant quartz glass (temperature resistance ≥ 1500°C), ensuring an unobstructed optical observation path for arc morphology and compatibility with multi-angle high-speed photography and spectral analysis.

[0060] The contact arc extinguishing test platform also includes an observation system, consisting of a high-frequency pulsed laser illumination system and a high-speed camera, positioned on one side of the arcing contact. The high-frequency pulsed laser illumination system provides illumination and eliminates arc self-luminescence interference, while the high-speed camera records the spatiotemporal distribution of the arc-contact interaction. Using high-speed videography and synchronous contact resistance measurement, a real-time correlation model between the ablation rate and arc energy was constructed. This technology accurately quantifies the ablation dynamics of the arcing contact under different operating conditions, providing intuitive and accurate data support for in-depth analysis of the ablation mechanism.

[0061] The multi-environment coupling test unit includes a temperature and humidity control module, which is used to provide the temperature and humidity environment required for the test. In this embodiment, the temperature and humidity control module is a high and low temperature test chamber, which is used to regulate temperature and humidity, and can achieve constant temperature or circulation.

[0062] The electrical parameter control system includes a current generator, a resistance test module, and a rectification and protection unit. The output of the current generator is connected to the contact arc extinguishing test platform. The resistance test module measures the contact resistance between the contacts in real time. The rectification and protection unit is connected to the current generator. The rectification and protection unit is used to adjust the required voltage and current and protect the equipment from burnout. The current generator has a dual-circuit constant current output to ensure current flow. The resistance test module is a four-terminal resistance test module. The rectification and protection unit includes a forced air-cooled rectifier tube group.

[0063] The control and data acquisition module is used to set and collect test parameters including temperature, humidity, voltage, current, operating speed, etc.

[0064] The arc contact multi-factor coupling test equipment of this embodiment has the following optional parameter ranges:

[0065] Test area dimensions: width (W) 1000mm × height (H) 1300mm × depth (D) 1000mm;

[0066] Output current: 0A~3150A, 0A~40kA, dual-circuit interface, current measurement accuracy: ±1%, constant current output is selected, when running with load, the constant current output current is controlled and adjustable by the host computer;

[0067] Temperature range: -100℃ to +150℃;

[0068] Humidity range: 20%RH to 98%RH;

[0069] Reciprocating mechanism speed: 0-15m / s, reciprocating mechanism loading force: 0-500N, motion stroke: 0-50mm;

[0070] Four-terminal resistance test accuracy: ±1%;

[0071] Digital display: input power supply voltage, current, output voltage, current, accurate readings;

[0072] Rectifier tube: adopts forced air cooling, temperature control and overheat protection;

[0073] Intermittent rated current working core and coil temperature: not exceeding 80℃.

[0074] High-power high-frequency pulsed laser lighting system, with a maximum power of 500W; the pulse repetition frequency can reach up to 400KHz, with a central wavelength of 810nm;

[0075] The maximum shooting rate of the high-speed camera can reach 525,000 frames per second, the shooting rate can reach 290,000 frames per second at a resolution of 640×128, and the shooting rate can reach 520,000 frames per second at a resolution of 640×64.

[0076] This equipment has extensive coverage and high accuracy in parameters such as test area size, output current, temperature and humidity (for example, current measurement accuracy reaches ±1%, and four-terminal resistance test accuracy reaches ±1%), fully meeting the R&D and quality control requirements for arc contact ablation resistance in various scenarios such as GIS and HVDC circuit breakers.

[0077] Example 2

[0078] This embodiment provides a method for evaluating the service characteristics of an arcing contact, comprising the following steps:

[0079] Sample pretreatment and installation: measure the appearance, size, and original mass of the sample to be tested, and place it on the corresponding sample stage according to the shape of the sample;

[0080] Multi-factor coupling test: Insulating gas is introduced into the equipment, the current generator is turned on, the temperature and cycle curve are set, and the stroke value is set. The sample is moved back and forth through the operating mechanism to test the service characteristics of the sample under different cycle temperatures, arc erosion and impact. During the test, the voltage, current, stroke, impact force, contact surface temperature, surface contact resistance are recorded in real time, and the changes in the contact and arc during the test are photographed.

[0081] Post-processing and performance evaluation: Take out the tested samples, measure their dimensional (radial and axial) changes and mass, evaluate the contact performance based on the test data, sample size and remaining mass, and determine the remaining life.

[0082] The determining of the remaining life includes:

[0083] Whether the arc contact has failed is determined according to the failure judgment standard. If it has not failed, the remaining life is calculated. If it has failed, the remaining life is 0.

[0084] The failure judgment criteria are:

[0085] Mass loss Δm max ≥20g; and / or

[0086] Residual tensile strength σ res ≤0.7σ b and / or

[0087] Hardness reduction ΔHV ≥ 20%; and / or

[0088] Contact resistance jump R c ≥2R c0 ;

[0089] Where, Δm max is the maximum mass loss of the arcing contact during the test, σ b is the tensile strength, σ res is the residual tensile strength, ΔHV is the percentage of hardness reduction based on the initial hardness, R c0 is the initial contact resistance, R c is the contact resistance of the sample after testing.

[0090] The remaining life N 剩余 The calculation formula is:

[0091]

[0092] Where, Δm max is the maximum mass loss of the arc contact during the test (mg), Δm 累计 is the cumulative mass loss of the arc contact during the test (mg), is the average mass loss rate (mg / C), is the average arc charge (C);

[0093] L c is the crack length (μm), L crit is the critical crack length (μm), is the average crack growth rate (μm / time);

[0094] σ b is the tensile strength (MPa), σ res is the residual tensile strength (MPa), Δσ cycle is the strength degradation in a single cycle (MPa / time).

[0095] The average mass loss rate is calculated as follows:

[0096]

[0097] The average arc charge is calculated as follows:

[0098] Among them, M i : Mass loss of the i-th test (mg), Q i : arc charge of the i-th test (C);

[0099] The mass loss M of the i-th test i The calculation method is:

[0100]

[0101] Where, k: material ablation coefficient;

[0102] I a : arc current (kA);

[0103] U a : arc voltage (V);

[0104] T a : arcing time (s);

[0105] σ b Tensile strength (MPa), σ res Residual tensile strength (MPa);

[0106] β: strength degradation influencing factor;

[0107] γ: crack growth sensitivity coefficient.

[0108] The present method for evaluating arcing contact service characteristics uses arcing contact performance parameters such as mass loss, residual tensile strength, hardness, and contact resistance to accurately quantify ablation parameters and predict service life based on failure criteria. This method not only avoids the high costs and complex processes associated with traditional destructive testing but also significantly improves prediction accuracy and evaluation efficiency, providing a scientific basis for equipment maintenance and quality control.

[0109] Example 3

[0110] This embodiment provides an arc contact testing method, which uses the arc contact multi-factor coupling testing device to perform testing, including the following steps:

[0111] Set test parameters;

[0112] Simulate the use environment of arc contacts;

[0113] Electrical parameters to simulate the arc contact usage process;

[0114] Arcing contacts reciprocate;

[0115] Collect test data.

[0116] The arc contact service characteristics are evaluated based on the test results. The specific process is as follows:

[0117] Test equipment preset parameters:

[0118] Removable contact arc extinguishing test platform: opening distance 20mm, gas SF6.

[0119] Air blowing simulation system: air flow rate 10m / s, pressure 5MPa.

[0120] High-power high-frequency pulsed laser illumination system: central wavelength 810nm, maximum power 500W, pulse repetition frequency 400kHz.

[0121] High-speed camera configuration: maximum shooting rate 525,000 frames / second, resolution supports 640×128 (290,000 frames / second) and 640×64 (520,000 frames / second).

[0122] Temperature and humidity control module: temperature setting -50℃ to +70℃, humidity 50% RH.

[0123] Reciprocating operating mechanism: movement speed 12m / s, loading force 300N, simulated contact opening and closing mechanical impact, movement stroke accuracy ±0.1mm.

[0124] Dual-circuit constant current output: 40kA (high current mode), constant current accuracy ±1%.

[0125] Four-terminal resistance test module: contact resistance measurement accuracy ±1%, sampling frequency 1MHz, synchronous recording of contact surface temperature (infrared temperature measurement, accuracy ±1℃).

[0126] Rectification and protection unit: forced air cooling rectifier tube group, equipped with over-temperature protection (threshold 200℃) to ensure high current output stability.

[0127] S1. Arc contact pretreatment and installation

[0128] The axial and radial dimensions of the contacts were measured using a micrometer (accuracy ±1 μm), and the original mass was recorded using an electronic balance (accuracy ±0.1 mg).

[0129] Sample installation: Select an appropriate sample stage according to the contact type, adjust the opening distance to 20mm after fixing, and introduce insulating gas to the cavity pressure of 0.4MPa.

[0130] S2. Multi-factor coupling test

[0131] Parameter settings:

[0132] Electrical parameters: Set the current waveform to 40kA / 100ms (10ms per ablation).

[0133] Environmental parameters: set temperature cycle curve Cycle 10 times, humidity 50% RH.

[0134] Mechanical parameters: reciprocating speed 12m / s, loading force 300N, simulating 10 opening and closing operations.

[0135] Real-time data collection:

[0136] Synchronously record arc voltage, current waveform, and contact surface temperature (maximum sampling rate 1MHz).

[0137] The high-speed camera captures the arc morphology and the dynamic process of contact ablation, and saves 100,000 frames of image data per cycle.

[0138] S3. Post-processing and performance evaluation

[0139] Contact mass loss measurement: Weigh with an electronic balance and calculate the mass ablation rate (unit: mg / kA·s).

[0140] Dimensional change analysis: A three-dimensional coordinate measuring machine detects axial necking and radial expansion (accuracy ±5μm).

[0141] Surface morphology comparison: Scanning electron microscopy (SEM) was used to observe the depth of the ablation pit and the crack propagation path.

[0142] Life prediction algorithm: Fits the ablation rate-current-temperature multivariate model, and automatically outputs the remaining life prediction value after inputting the test data.

[0143] Taking copper tungsten 80 (CuW80) contacts as an example,

[0144] Before the experiment, the contact mass was 567.79 g and the length was 206.75 mm.

[0145] The ablation current is 20kA, the average arcing time is 15.5ms, and the number of ablation times is 20 times.

[0146] After the experiment, the contact mass is 557.86g and the length is 204.27mm.

[0147] Based on fracture mechanics theory, K IC is the fracture toughness of the material:

[0148]

[0149] L crit =15 2 / (π·1200 2 )=49μm

[0150] Average charge

[0151] Δσ cycle =(σ b -σ res ) / n=(1200-1000) / 20=10MPa / time

[0152] N remaining = min((20-9.97) / (0.0016×310), (49-30) / 2, (1200-840) / 10) = min(20.2, 9.5, 36) = 9 cycles.

[0153] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An arc contact multi-factor coupling test device, characterized in that: include: Multi-environment coupling test box to simulate the operating environment of arc contacts; A contact arc extinguishing test platform is provided in the multi-environment coupling test box, and is used to fix the arc contact to simulate the high current arc breaking process of the contact; An electrical parameter control system, provided on one or more sides of the multi-environment coupling test box, for controlling electrical parameters during the test process; The control and data acquisition module is connected to the multi-environment coupling test box, the contact arc extinguishing test platform, and the electrical parameter control system respectively, and is used to set test parameters and collect test data.

2. The arc contact multi-factor coupling test equipment according to claim 1, characterized in that: The contact arc extinguishing test platform includes a sample table for fixing arc contact samples, an air blowing simulation system and a reciprocating operating mechanism; The air blowing simulation system and the reciprocating operating mechanism are electrically connected to the electrical parameter control system and the control and data acquisition module respectively; The air outlet of the air blowing simulation system is aligned with the sample stage, which is used to simulate the air blowing effect during the circuit breaker opening and closing process; the reciprocating operating mechanism is connected to the sample stage to control the movement of the arc contact sample, which is used to simulate the mechanical impact of contact opening and closing.

3. The arc contact multi-factor coupling test equipment according to claim 2, characterized in that: The sample stage is provided with a detachable clamp, and the clamp can adjust the opening distance.

4. The arc contact multi-factor coupling test equipment according to claim 2, characterized in that: The air blowing simulation system includes a transparent nozzle.

5. The arc contact multi-factor coupling test equipment according to claim 2, characterized in that: The contact arc extinguishing test platform also includes an observation system, which includes a high-frequency pulse laser lighting system and a high-speed camera arranged on one side of the arc contact. The high-frequency pulse laser lighting system is used to provide lighting and eliminate arc self-luminous interference, and the high-speed camera is used to record the spatiotemporal distribution of the interaction between the arc and the contact.

6. The arc contact multi-factor coupling test equipment according to claim 1, characterized in that: The multi-environment coupling test box includes a temperature and humidity control module, which is used to provide the temperature and humidity environment required for the test.

7. The arc contact multi-factor coupling test equipment according to claim 1, characterized in that: The electrical parameter control system includes a current generator, a resistance testing module and a rectification and protection unit; the output end of the current generator is connected to the contact arc extinguishing test platform, the resistance testing module tests the contact resistance between contacts in real time, and the rectification and protection unit is connected to the current generator.

8. The arc contact multi-factor coupling test equipment according to claim 7, characterized in that: The rectification and protection unit includes a forced air-cooled rectification tube group.

9. A method for testing arc contacts, characterized in that: The test is performed using the arc contact multi-factor coupling test device according to any one of claims 1 to 8, comprising: Set test parameters; Simulate the use environment of arc contacts; Control electrical parameters during arc contact test; Control the reciprocating motion of arcing contacts; Collect test data.

10. A method for evaluating the service characteristics of an arc contact, characterized in that: The following steps are involved: Measure the size and original mass of arc contact samples; Testing the arc contact sample using the testing method according to claim 9 to obtain test data; Measure the residual mass of arc contact samples; Evaluate arc contact performance and determine remaining life based on test data, sample size, original mass and residual mass; The arc contact performance is evaluated using arc contact performance parameters such as mass loss, residual tensile strength, hardness, and contact resistance.

11. The evaluation method according to claim 10, characterized in that: The determining of the remaining life includes: Whether the arc contact sample has failed is determined according to a failure judgment standard. If it has not failed, the remaining life is calculated. If it has failed, the remaining life is 0.

12. The evaluation method according to claim 11, wherein: The failure judgment criteria are: Mass loss Δm max ≥20g; and / or Residual tensile strength σ res ≤0.7σ b and / or Hardness reduction ΔHV ≥ 20%; and / or Contact resistance jump R c ≥2R c0 ; Where, Δm max is the maximum mass loss of the arcing contact during the test, σ b is the tensile strength, σ res is the residual tensile strength, ΔHV is the percentage of hardness reduction based on the initial hardness, R c0 is the initial contact resistance, R c is the contact resistance of the sample after testing.

13. The evaluation method according to claim 11, wherein: The remaining life is determined by the following calculation formula: Among them, N 剩余 is the remaining life, Δm max is the maximum mass loss of the arc contact during the test (mg), Δm 累计 is the cumulative mass loss of the arc contact during the test (mg), is the average mass loss rate (mg / C), is the average arc charge (C); L c is the crack length (μm), L crit is the critical crack length (μm), is the average crack growth rate (μm / time); σ b is the tensile strength (MPa), σ res is the residual tensile strength (MPa), Δσ cycle is the strength degradation in a single cycle (MPa / time).

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