Device and method for testing corrosion resistance of silver coating of high-voltage isolating switch in coastal electromagnetic environment

Abstract

The invention provides a device and a method for testing the corrosion resistance of a silver coating of a high-voltage isolating switch in a coastal electromagnetic environment. The device comprises a salt mist box connected with a power supply, an electric field generator, a magnetic field generator, a camera, a PLC (Programmable Logic Controller) control module and an acquisition and analysis module, the PLC control module is used for collecting environmental data and images shot by the camera, and regulating and controlling the salt mist box, the electric field generator and the magnetic field generator to simulate industrial atmosphere in a coastal electromagnetic environment based on the environmental data; and the acquisition and analysis module is used for analyzing the environmental data and images acquired by the PLC control module to obtain the corrosion resistance grade of the electrical contact sample. The device can simulate salt mist concentration, temperature and humidity, pollutants and an electromagnetic field during operation of high-voltage equipment in the coastal industrial atmospheric environment, comprehensively reproduce the actual service environment of the silver coating of the electrical contact of the high-voltage isolating switch, simulate the actual operation condition, evaluate the corrosion resistance of the silver coating of the electrical contact under the complex environmental condition, and improve the service life of the electrical contact. And linkage adjustment of multiple test parameters can be realized.

Description

Technical Field

[0001] This invention belongs to the field of power equipment testing technology, specifically relating to a device and method for testing the corrosion resistance of silver plating on high-voltage disconnect switches under coastal electromagnetic environments. Background Technology

[0002] High-voltage disconnect switches are crucial equipment in power systems, primarily used for isolating power sources, altering system operating modes, switching small load currents, and performing switching operations. In power systems, the usage of high-voltage disconnect switches is typically 2-3 times that of circuit breakers. While their structure is relatively simple, they play an indispensable role in power grid operation. The silver plating layer on the electrical contacts of high-voltage disconnect switches possesses excellent conductivity and corrosion resistance, preventing contact surface oxidation, reducing contact resistance, and improving equipment reliability. The quality of the silver plating layer directly affects the current carrying capacity and service life of the disconnect switch; therefore, it is necessary to study the corrosion resistance performance of the silver plating layer.

[0003] However, existing methods for testing the corrosion resistance of silver plating have the following limitations: First, the environmental simulation is incomplete. Coastal industrial atmospheric environments are characterized by high salt spray concentrations, high humidity, frequent temperature and humidity changes, and the synergistic effects of pollutants (such as sulfur dioxide and hydrogen sulfide). These factors, combined with the electric and magnetic fields generated during the operation of high-voltage equipment, significantly affect the corrosion resistance of the silver plating. Traditional salt spray tests mainly simulate climatic factors such as salt spray, temperature, and humidity, without considering the coupling effect of electric and magnetic fields, and cannot truly reflect the actual operating conditions of high-voltage disconnect switches. Second, dynamic operating conditions cannot be assessed. Existing testing methods are mostly static tests, which cannot assess the impact of the electric and magnetic fields generated by the electrical contacts of high-voltage disconnect switches during operation (such as opening and closing operations, current flow) on the corrosion resistance of the silver plating, making it difficult to truly reflect the performance of the equipment in actual use. Therefore, there is an urgent need to propose a testing method that can comprehensively simulate the coastal industrial atmospheric environment and couple electromagnetic fields. Summary of the Invention

[0004] To address the issues of incomplete environmental simulation and inability to assess the corrosion resistance of silver plating under dynamic operating conditions in existing technologies, this invention proposes a testing device and method for the corrosion resistance of silver plating on high-voltage disconnect switches under coastal electromagnetic environments. The device includes: a power supply 5, and a salt spray chamber 1, an electric field generator 3, a magnetic field generator 4, several cameras 6, a PLC control module 7, and an acquisition and analysis module 8 connected to the power supply 5.

[0005] Several electrical contact samples 2 of high-voltage disconnect switches are installed in the salt spray chamber 1;

[0006] The PLC control module 7 is communicatively connected to the salt spray chamber 1, the electric field generator 3, the magnetic field generator 4, several cameras 6, and the acquisition and analysis module 8, respectively. It is used to collect environmental data and images captured by the several cameras 6, and based on the environmental data, adjust the salt spray chamber 1, the electric field generator 3, and the magnetic field generator 4 to simulate the industrial atmosphere under the electromagnetic environment of the coastal area, and at the same time send the environmental data and images to the acquisition and analysis module 8.

[0007] The acquisition and analysis module 8 is used to analyze and calculate the environmental data and images to obtain the corrosion resistance level of the electrical contact sample 2.

[0008] The plurality of cameras 6 are installed in the salt spray chamber 1 and are used to photograph the surface of the electrical contact sample 2 placed in the salt spray chamber 1 at set time intervals.

[0009] The environmental data includes: temperature, humidity, concentration of salt spray and other gases, electric field strength, and magnetic field strength.

[0010] Preferably, the magnetic field generator 4 is made of a corrosion-resistant material.

[0011] Preferably, the magnetic field generator 4 includes a Helmholtz coil;

[0012] The Helmholtz coil is encapsulated in a corrosion-resistant material.

[0013] Preferably, the electric field generator 3 includes: two electrode plates, one positive and one negative;

[0014] The positive and negative electrode plates are made of corrosion-resistant material, and the interfaces between the positive and negative electrode plates and the salt spray chamber 1 are sealed.

[0015] Preferably, the salt spray chamber 1 includes: an inner liner, and an atmospheric environment simulation module 9, a temperature control module 10, a dry and wet circulation module 11, and a sample rack installed in the inner liner;

[0016] The atmospheric environment simulation module 9, temperature control module 10, and dry-wet cycle module 11 are all connected to and controlled by the PLC control module 7.

[0017] The sample holder is located between the positive and negative electrode plates and is used to fix the electrical contact sample 2.

[0018] Preferably, the inner liner is made of a corrosion-resistant material.

[0019] Preferably, the PLC control module 7 includes: a temperature and humidity sensor, a salt spray and other gas concentration detection device, an electric field strength detection device, and a magnetic field strength detection device located in the salt spray chamber 1.

[0020] Preferably, the acquisition and analysis module 8 includes: a four-probe tester and an analysis device;

[0021] The four-probe tester is located in the salt spray chamber 1 and is in contact with the electrical contact sample 2;

[0022] The analysis device is communicatively connected to the four-probe tester and the PLC control module 7, respectively, and is used to receive environmental data, data related to the electrical contact sample 2 acquired by the four-probe tester, and the image. It uses an image recognition algorithm to quantify the degree and area of ​​discoloration of the silver plating layer of the electrical contact sample 2 compared to before the test, and combines the received data to perform analysis and calculation to determine the corrosion resistance level of the electrical contact sample 2.

[0023] The effect of the electromagnetic field on the corrosion resistance of the silver plating layer of the electrical contact sample 2 is represented by the influence factor of the electromagnetic field on corrosion behavior.

[0024] Preferably, the influence factor of the electromagnetic field on corrosion behavior is determined by the following formula:

[0025]

[0026] In the formula, EMIF is the influence factor of electromagnetic field on corrosion behavior, ΔR / R0 is the rate of change of contact resistance, and A corr i represents the percentage of the corroded area. corr t represents the corrosion current density and t represents the test duration.

[0027] Preferably, the device further includes: a safety protection module;

[0028] The safety protection module is located outside the salt spray chamber 1 and is used for electromagnetic shielding, salt spray leakage detection, and grounding protection.

[0029] Based on the same inventive concept, this invention also provides a method for testing the corrosion resistance of silver plating on high-voltage disconnect switches under coastal electromagnetic environments. The method utilizes the aforementioned testing device for the corrosion resistance of silver plating on high-voltage disconnect switches under coastal electromagnetic environments to perform corrosion resistance testing on the silver plating on high-voltage disconnect switches under coastal electromagnetic environments. The method includes:

[0030] Several electrical contact samples 2 of high-voltage disconnect switches are arranged in the salt spray chamber 1 of the test device;

[0031] The PLC control module 7 in the testing device collects environmental data and images captured by several cameras 6, and sends them to the acquisition and analysis module 8 in the testing device.

[0032] Based on the environmental data, the PLC control module 7 is used to adjust the salt spray chamber 1, the electric field generator 3 and the magnetic field generator 4 in the test device to simulate the industrial atmosphere under the coastal electromagnetic environment, and to test the corrosion resistance of the silver plating layer of the high-voltage disconnect switch.

[0033] The environmental data and images are analyzed and calculated by the acquisition and analysis module 8 to obtain the corrosion resistance level of the electrical contact sample 2;

[0034] The environmental data includes: temperature, humidity, concentration of salt spray and other gases, electric field strength, and magnetic field strength.

[0035] Preferably, the step of acquiring environmental data and images captured by several cameras 6 through the PLC control module 7 in the testing device and sending them to the acquisition and analysis module 8 in the testing device includes:

[0036] Environmental data is collected through the temperature and humidity sensor, salt spray and other gas concentration detection device, electric field strength detection device and magnetic field strength detection device in the PLC control module 7.

[0037] The PLC control module 7 acquires images captured by the plurality of cameras 6;

[0038] The PLC control module 7 sends the environmental data and images to the acquisition and analysis module 8.

[0039] Preferably, based on the environmental data, the PLC control module 7 adjusts the salt spray chamber 1, the electric field generator 3, and the magnetic field generator 4 in the testing device to simulate the industrial atmosphere under coastal electromagnetic conditions, and conducts corrosion resistance tests on the silver plating layer of the high-voltage disconnector, including:

[0040] Based on the temperature, humidity, and concentrations of salt spray and other gases in the environmental data, the atmospheric environment simulation module 9, temperature control module 10, and dry-wet cycle module 11 in the salt spray chamber 1 are controlled by the PLC control module 7 to simulate pollutants in the coastal industrial atmosphere.

[0041] Based on the electric and magnetic field strengths in the environmental data, the electric field generator 3 and magnetic field generator 4 are controlled by the PLC control module 7 to simulate the coastal electromagnetic environment in order to test the corrosion resistance of the silver plating layer of the high-voltage disconnect switch in the industrial atmosphere of the coastal electromagnetic environment.

[0042] Preferably, the step of analyzing and calculating the environmental data and the image through the acquisition and analysis module 8 to obtain the corrosion resistance level of the electrical contact sample 2 includes:

[0043] Based on the image, the analysis device in the acquisition and analysis module 8 uses an image recognition algorithm to quantify the degree and area of ​​discoloration of the silver plating layer of the electrical contact sample 2 compared to before the test, and obtains the degree and area of ​​discoloration of the silver plating layer of the electrical contact sample 2 compared to before the test.

[0044] The contact resistance value of the electrical contact sample 2 is obtained by the four-probe tester in the acquisition and analysis module 8;

[0045] Based on the environmental data, the contact resistance value of the electrical contact sample 2, the degree of discoloration and the discoloration area of ​​the silver plating layer of the electrical contact sample 2 compared to before the test, the corrosion area ratio, contact resistance change rate and corrosion current density are calculated by the analysis device to determine the influence of the electromagnetic field on the corrosion resistance of the silver plating layer of the electrical contact sample 2 and the corrosion resistance level of the electrical contact sample 2.

[0046] The effect of the electromagnetic field on the corrosion resistance of the silver plating layer of the electrical contact sample 2 is represented by the influence factor of the electromagnetic field on corrosion behavior.

[0047] Preferably, the influence factor of the electromagnetic field on corrosion behavior is determined by the following formula:

[0048]

[0049] In the formula, EMIF is the influence factor of electromagnetic field on corrosion behavior, ΔR / R0 is the rate of change of contact resistance, and A corr i represents the percentage of the corroded area. corr t represents the corrosion current density and t represents the test duration.

[0050] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0051] This invention provides a testing device and method for the corrosion resistance of silver plating on high-voltage disconnect switches under coastal electromagnetic environments. The testing device includes: a power supply 5, and a salt spray chamber 1, an electric field generator 3, a magnetic field generator 4, several cameras 6, a PLC control module 7, and a data acquisition and analysis module 8 connected to the power supply 5; several electrical contact samples 2 of high-voltage disconnect switches are installed in the salt spray chamber 1; the PLC control module 7 is communicatively connected to the salt spray chamber 1, the electric field generator 3, the magnetic field generator 4, the several cameras 6, and the data acquisition and analysis module 8, and is used to acquire environmental data and images captured by the several cameras 6. Based on the environmental data, the salt spray chamber 1, electric field generator 3, and magnetic field generator 4 are adjusted to simulate the industrial atmosphere under coastal electromagnetic environment, and the environmental data and images are sent to the acquisition and analysis module 8. The acquisition and analysis module 8 is used to analyze and calculate the environmental data and images to obtain the corrosion resistance level of the electrical contact sample 2. Several cameras 6 are installed in the salt spray chamber 1 to take pictures of the surface of the electrical contact sample 2 placed in the salt spray chamber 1 at set time intervals. The environmental data includes: temperature, humidity, concentration of salt spray and other gases, electric field strength, and magnetic field strength. The salt spray chamber 1, electric field generator 3, and magnetic field generator 4 in this device can simulate the salt spray concentration, temperature, humidity, pollutants, and electric and magnetic fields of high-voltage equipment operation in the coastal industrial atmospheric environment. This fully replicates the actual service environment of the silver-plated layer of the high-voltage disconnector contact, simulates the actual operating conditions of the contact in the coastal industrial atmospheric environment, and evaluates the corrosion resistance of the silver-plated layer of the contact under complex environmental conditions through the synergistic effect of electric and magnetic fields. The PLC control module 7 enables the linkage adjustment of multiple test parameters, making operation simple, the test cycle short, and enabling rapid evaluation of the corrosion resistance of the silver-plated layer. Attached Figure Description

[0052] Figure 1 A schematic diagram of the structure of a corrosion resistance testing device for silver plating layer of high-voltage disconnect switch under coastal electromagnetic environment provided by the present invention;

[0053] Figure 2 This is a flowchart illustrating a method for testing the corrosion resistance of silver plating on a high-voltage disconnector in a coastal electromagnetic environment, as provided by the present invention.

[0054] The reference numerals are as follows: 1-Salt spray chamber, 2-Electrical contact sample of high-voltage disconnect switch, 3-Electric field generator, 4-Magnetic field generator, 5-Power supply, 6-Camera, 7-PLC control module, 8-Acquisition and analysis module, 9-Atmospheric environment simulation module, 10-Temperature control module, 11-Dry and wet cycle module. Detailed Implementation

[0055] The purpose of this invention is to provide a testing device and method for the corrosion resistance of silver-plated coatings on high-voltage disconnecting switch contacts, simulating the coupled electric and magnetic field environments of a coastal industrial atmosphere. The device constructs a multi-factor coupled simulation system, comprising a salt spray chamber 1, an electric field generator 3, a magnetic field generator 4, and a PLC control module 7, all capable of simulating a coastal industrial atmospheric environment. A sample of the high-voltage disconnecting switch contact 2 is placed inside the salt spray chamber 1. Electric and magnetic fields are applied by the electric field generator 3 and magnetic field generator 4, respectively. The PLC control module 7 adjusts the salt spray concentration, temperature, humidity, electric field strength, and magnetic field strength in a coordinated manner, achieving the synergistic effect of multiple factors. This enables the evaluation of the corrosion resistance of the silver-plated coating under real-world conditions, solving the problems of incomplete environmental simulation and inability to assess the corrosion resistance of the coating under dynamic conditions in existing testing methods.

[0056] To better understand the present invention, the following description, in conjunction with the accompanying drawings and embodiments, will further illustrate the content of the present invention.

[0057] Example 1:

[0058] A corrosion resistance testing device for silver plating on high-voltage disconnect switches under coastal electromagnetic environments is shown in the schematic diagram below. Figure 1 As shown, it includes: a power supply 5, and a salt spray chamber 1, an electric field generator 3, a magnetic field generator 4, several cameras 6, a PLC control module 7, and a data acquisition and analysis module 8 connected to the power supply 5.

[0059] Several electrical contact samples 2 of high-voltage disconnect switches are installed in the salt spray chamber 1;

[0060] The PLC control module 7 is communicatively connected to the salt spray chamber 1, the electric field generator 3, the magnetic field generator 4, several cameras 6, and the acquisition and analysis module 8, respectively. It is used to collect environmental data and images captured by the several cameras 6, and based on the environmental data, adjust the salt spray chamber 1, the electric field generator 3, and the magnetic field generator 4 to simulate the industrial atmosphere under the electromagnetic environment of the coastal area, and at the same time send the environmental data and images to the acquisition and analysis module 8.

[0061] The acquisition and analysis module 8 is used to analyze and calculate the environmental data and images to obtain the corrosion resistance level of the electrical contact sample 2.

[0062] The plurality of cameras 6 are installed in the salt spray chamber 1 and are used to photograph the surface of the electrical contact sample 2 placed in the salt spray chamber 1 at set time intervals.

[0063] The environmental data includes: temperature, humidity, concentration of salt spray and other gases, electric field strength, and magnetic field strength.

[0064] a) Salt spray chamber 1: Constructed with a fiberglass inner liner, offering excellent corrosion resistance. An electric field generator 3 is installed inside the salt spray chamber 1 to apply an electric field. The salt spray chamber 1 also includes an atmospheric environment simulation module 9 capable of adding sulfur dioxide and hydrogen sulfide to simulate pollutants found in coastal industrial atmospheres. The salt spray chamber 1 is equipped with a temperature control module 10 and a dry-wet cycle module 11, enabling precise control of temperature (35-45℃) and relative humidity (70%-95%).

[0065] b) Electric field generator 3: Employs titanium alloy electrodes (TA2 or Ti-0.2Pd), which possess excellent corrosion resistance. The electric field generator 3 can apply an electric field strength of 0.1-1 kV / m, achieved by adjusting the electrode spacing and voltage. Fluororubber sealing rings are used at the interface between the electrodes and the salt spray chamber 1 to prevent salt spray penetration.

[0066] c) Magnetic field generator 4: Employs samarium cobalt magnets or ferrite magnets, which possess excellent corrosion resistance. Magnetic field generator 4 generates a uniform magnetic field (0.1-0.5T) through a Helmholtz coil structure, covering the area where the electrical contact sample 2 is located. The magnetic field coil is encapsulated in epoxy resin to ensure long-term stability in salt spray environments.

[0067] d) PLC Control Module 7: This module uses a PLC to achieve coordinated adjustment of salt spray concentration, temperature and humidity, electric field strength, and magnetic field strength. It is equipped with temperature and humidity sensors, salt spray and other gas concentration detection devices, electric field strength detection devices, and magnetic field strength detection devices. It can monitor and provide feedback on environmental data in real time (the initial environmental data collected at the start of the test is 0; after the detection value is 0, the PLC control module 7 adjusts the atmospheric environment simulation module 9, temperature control module 10, dry-wet cycle module 11, electric field generator 3, and magnetic field generator 4 according to the set parameters).

[0068] e) Acquisition and Analysis Module 8: Includes a four-probe tester and an analysis device. It receives environmental data, data related to the electrical contact sample 2 acquired by the four-probe tester, and the image. Using an image recognition algorithm, it quantifies the degree and area of ​​discoloration of the silver plating layer of the electrical contact sample 2 compared to before the test. Simultaneously, it analyzes and calculates the received data to determine the corrosion resistance level of the electrical contact sample 2.

[0069] f) Safety Protection Module: The safety protection module is located outside the salt spray chamber 1 and is used for electromagnetic shielding, salt spray leakage detection, and grounding protection to ensure the safety of the testing process. Depending on the specific model and function, the safety protection module may be connected to the power supply 5 or operate using its own power source.

[0070] The electrical contact sample 2 comprises a silver plating layer and a copper substrate. The silver plating layer should be ≥20μm thick and have a hardness ≥120HV. The sample preparation steps are as follows:

[0071] Remove electrical contact sample 2 from the high-voltage disconnect switch to ensure that the sample is representative;

[0072] The surface of electrical contact sample 2 was cleaned to remove contaminants such as grease and dust.

[0073] Number the electrical contact sample 2 and record its basic information (such as voltage level, coating thickness, hardness, etc.);

[0074] The electrical contact sample 2 is fixed on the sample rack inside the salt spray chamber 1 to ensure that the sample can be fully exposed to the salt spray, electric field and magnetic field environment.

[0075] The parameter settings are as follows:

[0076] a) Atmospheric environmental parameters for coastal industries:

[0077] Salt spray concentration: 5% sodium chloride solution;

[0078] Relative humidity: 70%-95%;

[0079] Temperature: 35-45℃;

[0080] Pollutant concentrations: 0.05%-0.1% each for sulfur dioxide and hydrogen sulfide;

[0081] Test cycle: 240-480 hours.

[0082] b) Electric field parameters:

[0083] Electric field strength: 0.1-1 kV / m;

[0084] Electric field direction: perpendicular to the surface of the silver plating layer;

[0085] Electrode material: TA2 or Ti-0.2Pd titanium alloy;

[0086] Electrode spacing: determined by calculation based on voltage level and contact spacing.

[0087] c) Magnetic field parameters:

[0088] Magnetic field strength: 0.1-0.5T;

[0089] Magnetic field direction: parallel to the surface of the silver plating layer;

[0090] Magnetic field generator: samarium cobalt magnet or ferrite magnet;

[0091] Magnetic field uniformity: ±5%.

[0092] The salt spray chamber 1, electric field generator 3, and magnetic field generator 4 in this device can simulate the salt spray concentration, temperature, humidity, pollutants, and electric and magnetic fields of high-voltage equipment operation in the coastal industrial atmospheric environment. This fully replicates the actual service environment of the silver-plated layer of the high-voltage disconnector contact, simulates the actual operating conditions of the contact in the coastal industrial atmospheric environment, and evaluates the corrosion resistance of the silver-plated layer of the contact under complex environmental conditions through the synergistic effect of electric and magnetic fields. The PLC control module 7 enables the linkage adjustment of multiple test parameters, making operation simple, the test cycle short, and enabling rapid evaluation of the corrosion resistance of the silver-plated layer.

[0093] Example 2:

[0094] Based on the same inventive concept, this invention also provides a method for testing the corrosion resistance of silver plating on high-voltage disconnect switches under coastal electromagnetic environments, as illustrated in the flowchart below. Figure 2 As shown, it includes:

[0095] Step 1: Arrange several electrical contact samples 2 of high-voltage disconnect switches in the salt spray chamber 1 of the test device;

[0096] Step 2: The PLC control module 7 in the testing device collects environmental data and images captured by several cameras 6, and sends them to the acquisition and analysis module 8 in the testing device;

[0097] Step 3: Based on the environmental data, the PLC control module 7 is used to adjust the salt spray chamber 1, the electric field generator 3 and the magnetic field generator 4 in the test device to simulate the industrial atmosphere under the coastal electromagnetic environment, and to test the corrosion resistance of the silver plating layer of the high-voltage disconnect switch.

[0098] Step 4: The environmental data and the image are analyzed and calculated by the acquisition and analysis module 8 to obtain the corrosion resistance level of the electrical contact sample 2;

[0099] The environmental data includes: temperature, humidity, concentration of salt spray and other gases, electric field strength, and magnetic field strength.

[0100] Before performing step 1, the apparatus must be prepared:

[0101] Check the operating status of salt spray chamber 1, electric field generator 3, magnetic field generator 4 and PLC control module 7;

[0102] Calibrate temperature and humidity sensors, salt spray and other gas concentration detection devices, electric field strength detection devices, and magnetic field strength detection devices;

[0103] Prepare a 5% sodium chloride salt spray solution, and 0.05%-0.1% sulfur dioxide and hydrogen sulfide gas, and add them to the atmospheric environment simulation module 9 in the salt spray chamber 1;

[0104] Set the electrode spacing and voltage of electric field generator 3 to ensure that the electric field strength is within the range of 0.1-1kV / m;

[0105] The magnetic field strength of the magnetic field generator 4 is set within the range of 0.1-0.5T;

[0106] Set up a PLC control module to achieve multi-parameter linkage adjustment.

[0107] Step 1 specifically includes:

[0108] Several electrical contact samples 2 of high-voltage disconnect switches are fixed on the sample rack inside the salt spray chamber 1;

[0109] Ensure that electrical contact sample 2 is fully exposed to salt spray, electric field and magnetic field environments.

[0110] Step 2 specifically includes:

[0111] Environmental data is collected through the temperature and humidity sensor, salt spray and other gas concentration detection device, electric field strength detection device and magnetic field strength detection device in the PLC control module 7.

[0112] The PLC control module 7 acquires images captured by the plurality of cameras 6;

[0113] The PLC control module 7 sends the environmental data and images to the acquisition and analysis module 8.

[0114] Step 3 specifically includes:

[0115] The PLC control module 7 is used to adjust the salt spray concentration, sulfur dioxide concentration, hydrogen sulfide concentration, temperature and humidity, electric field strength and magnetic field strength in a coordinated manner to achieve the synergistic effect of multiple factors.

[0116] At the start of the test, the PLC control module 7 initially collected environmental data of 0. After the detection was 0, the PLC control module 7 started the salt spray chamber 1 according to the set parameters, controlled the atmospheric environment simulation module 9 to spray a 5% sodium chloride salt spray solution, and added sulfur dioxide and hydrogen sulfide gas with a concentration of 0.05%-0.1%. The temperature of the temperature control module 10 was adjusted to 35-45℃, the humidity of the dry and wet cycle module 11 was adjusted to 70%-95%, the electric field strength of the electric field generator 3 was controlled within the range of 0.1-1kV / m, and the magnetic field strength of the magnetic field generator 4 was controlled within the range of 0.1-0.5T.

[0117] The system will continue to adjust the settings based on the parameters to keep the environmental data within the set parameters.

[0118] Step 4 specifically includes:

[0119] Based on the image, the analysis device in the acquisition and analysis module 8 uses an image recognition algorithm to quantify the degree and area of ​​discoloration of the silver plating layer of the electrical contact sample 2 compared to before the test, and obtains the degree and area of ​​discoloration of the silver plating layer of the electrical contact sample 2 compared to before the test.

[0120] The contact resistance value of the electrical contact sample 2 is obtained by the four-probe tester in the acquisition and analysis module 8;

[0121] Based on the environmental data, the contact resistance value of the electrical contact sample 2, the degree of discoloration and the discoloration area of ​​the silver plating layer of the electrical contact sample 2 compared to before the test, the corrosion area ratio, contact resistance change rate and corrosion current density are calculated by the analysis device to determine the influence of the electromagnetic field on the corrosion resistance of the silver plating layer of the electrical contact sample 2 and the corrosion resistance level of the electrical contact sample 2.

[0122] The evaluation metrics for the testing method include:

[0123] a) The corrosion resistance of the coating is evaluated by the percentage of corroded area. The corrosion resistance level of the silver coating is evaluated according to the GB / T 6461-2020 salt spray test standard. The corrosion resistance level of the silver coating is divided into 10 levels, with level 1 being the worst and level 10 being the best.

[0124] b) Contact resistance growth rate: The average growth rate of contact resistance during the test period, calculated using the following formula:

[0125] Resistance growth rate = (termination resistance - initial resistance) / initial resistance × 100%.

[0126] c) Compare the test results under different electric and magnetic field strengths, analyze the influence mechanism of electromagnetic field on the corrosion resistance of silver plating layer, and use the electromagnetic field influence factor (EMIF) on corrosion behavior to analyze the degree of influence of electric and magnetic fields on the corrosion resistance of silver plating layer.

[0127] The influence factor of the electromagnetic field on corrosion behavior is determined by the following formula:

[0128]

[0129] In the formula, EMIF is the influence factor of electromagnetic field on corrosion behavior, ΔR / R0 is the rate of change of contact resistance, and A corr i represents the percentage of the corroded area. corr t represents the corrosion current density and t represents the test duration.

[0130] Finally, a test report was generated, providing a scientific basis for the design, manufacturing, and maintenance of the silver plating layer on the electrical contacts of high-voltage disconnect switches.

[0131] The following is a test of the corrosion resistance of the silver plating layer on the electrical contacts of a 220kV high-voltage disconnector:

[0132] The corrosion resistance test was conducted on the silver plating layer of the electrical contacts of a 220kV high-voltage disconnector. The specific steps are as follows:

[0133] a) System preparation:

[0134] Check the operating status of salt spray chamber 1, electric field generator 3, magnetic field generator 4 and PLC control module 7;

[0135] Calibrate temperature and humidity sensors, salt spray and other gas concentration detection devices, electric field strength detection devices, and magnetic field strength detection devices;

[0136] Prepare a 5% sodium chloride salt spray solution, and add 0.05% sulfur dioxide and 0.05% hydrogen sulfide gas to the atmospheric environment simulation module 9 of the salt spray chamber 1.

[0137] The electrode spacing of the electric field generator 3 is set to 10mm, and the voltage is set to 22kV to ensure that the electric field strength is 22kV / 10mm = 2.2kV / m;

[0138] The magnetic field strength of magnetic field generator 4 is set to 0.3T;

[0139] PLC control module 7 is set up to realize multi-parameter linkage adjustment.

[0140] b) Sample installation:

[0141] Sample 2 of electrical contact was taken from a 220kV high-voltage disconnector. The sample is a silver-plated layer on a copper substrate with a thickness of 25μm and a hardness of 125HV.

[0142] The electrical contact sample 2 is fixed on the sample rack inside the salt spray chamber 1 to ensure that the sample can be fully exposed to the salt spray, electric field and magnetic field environment;

[0143] c) Environmental simulation:

[0144] Start salt spray chamber 1, spray 5% sodium chloride salt spray solution, and add sulfur dioxide and hydrogen sulfide gas;

[0145] Set the temperature to 35℃ and the humidity to 95%;

[0146] The test period is set to 240 hours.

[0147] Set the shooting time interval for camera 6;

[0148] The PLC control module 7 is used to adjust the concentration, temperature, humidity, electric field strength, and magnetic field strength of salt spray and other gases in a coordinated manner, so as to achieve the synergistic effect of multiple factors.

[0149] d) Results Analysis:

[0150] Contact resistance growth rate: (0.5Ω - 0.48Ω) / 0.48Ω × 100% = 4.17%;

[0151] According to the GB / T 6461-2020 salt spray test standard, the corrosion resistance level of the silver plating layer is level 10;

[0152] Electromagnetic field influence coefficient: (240-hour corrosion rate - 240-hour corrosion rate in a single salt spray environment) / 240-hour corrosion rate in a single salt spray environment × 100% = 25%.

[0153] This method has the following effects:

[0154] 1. More realistic environmental simulation: It can simulate the salt spray concentration, temperature and humidity, pollutants (such as sulfur dioxide and hydrogen sulfide) of the coastal industrial atmospheric environment, as well as the electric and magnetic fields of high-voltage equipment during operation, and fully reproduce the actual service environment of the silver plating layer.

[0155] 2. Dynamic operating condition evaluation: By leveraging the combined effects of electric and magnetic fields, the corrosion resistance of the silver plating layer under dynamic operating conditions can be evaluated, improving the accuracy and reliability of test results.

[0156] 3. Easy to operate: The PLC control module 7 enables multi-parameter linkage adjustment, making operation simple, the testing cycle short, and the ability to quickly evaluate the corrosion resistance of the silver plating layer.

[0157] Example 3:

[0158] In this embodiment, a set of comparative tests on the corrosion resistance of the silver plating layer of high-voltage disconnect switches were conducted under conditions of presence and absence of electromagnetic field using the aforementioned testing device and method for testing the corrosion resistance of the silver plating layer of high-voltage disconnect switches.

[0159] a) A sample 2 of electrical contacts of a high-voltage disconnector is installed in a salt spray chamber 1. The sample includes a silver-plated layer and a copper substrate. At the same time, a control group is set up that is exposed to corrosive atmospheric medium but without electromagnetic interference.

[0160] b) An electric field and a magnetic field are applied by an electric field generator 3 and a magnetic field generator 4, respectively, wherein the electric field strength is 0.1-1 kV / m and the magnetic field strength is 0.1-0.5 T.

[0161] c) The concentration, temperature, humidity, electric field strength, and magnetic field strength of salt spray and other gases are adjusted in conjunction with the PLC control module 7 to achieve the synergistic effect of multiple factors.

[0162] d) Sample performance characterization was performed. The contact resistance change was monitored using the four-probe tester in the acquisition and analysis module 8 to evaluate the corrosion resistance of the silver plating layer. Simultaneously, a camera 6 was installed in the salt spray chamber 1 to monitor the coating surface in situ, collecting real-time data on the grayscale value changes of the coating surface. The analysis device in the acquisition and analysis module 8 used image recognition algorithms to quantify the degree and area of ​​discoloration of the sample compared to before the test, facilitating subsequent evaluation.

[0163] e) Assess the degree of corrosion and corrosion resistance standards. The corrosion resistance performance of the coating is evaluated by the percentage of corrosion area and the rate of change of contact resistance. The corrosion resistance levels are shown in Table 1.

[0164] Table 1

[0165] Corrosion resistance rating Percentage of corroded area Contact resistance change rate Level I ≤5％ <![CDATA[ΔR / R0≤10%]]> Level II 5％-20％ <![CDATA[10%<ΔR / R0≤30%]]> Level III ＞20％ <![CDATA[ΔR / R0>30%]]>

[0166] The Electromagnetic Field Influence Factor (EMIF) quantifies the impact of electromagnetic fields on corrosion behavior by comparing corrosion rates with and without an electromagnetic field. Its definition formula is as follows:

[0167]

[0168] In the formula, EMIF is the influence factor of electromagnetic field on corrosion behavior, ΔR / R0 is the rate of change of contact resistance, and A corr i represents the percentage of the corroded area. corr t represents the corrosion current density and t represents the test duration.

[0169] Compare the EMIF values ​​of the two groups of samples to assess the influence of electromagnetic fields on the corrosion rate.

[0170] If EMIF 有电磁场 EMIF 无电磁场 This indicates that the electromagnetic field accelerated the corrosion rate.

[0171] If EMIF 有电磁场 ≈EMIF 无电磁场 This indicates that the electromagnetic field has a relatively small impact on the corrosion rate.

[0172] If EMIF 有电磁场 <EMIF 无电磁场 This indicates that the electromagnetic field may have a certain inhibitory effect on the corrosion rate.

[0173] Table 2 shows the relationship between the range of EMIF values ​​and the degree of influence of electromagnetic fields on the corrosion rate.

[0174] Table 2

[0175]

[0176] The testing device and method provided by this invention can simulate the actual operating conditions of high-voltage disconnecting switch contacts in a coastal industrial atmospheric environment, and evaluate the corrosion resistance of the silver plating layer under complex environmental conditions through the synergistic effect of electric and magnetic fields, providing a scientific basis and industry standard for the design, manufacturing and maintenance of high-voltage disconnecting switches.

[0177] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0178] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0179] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0180] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0181] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A device for testing the corrosion resistance of silver plating on high-voltage disconnect switches under coastal electromagnetic environments, characterized in that, include: Power supply (5), and salt spray chamber (1), electric field generator (3), magnetic field generator (4), several cameras (6), PLC control module (7) and acquisition and analysis module (8) connected to the power supply (5); Several electrical contact samples (2) of high-voltage disconnect switches are installed in the salt spray chamber (1); The PLC control module (7) is connected to the salt spray chamber (1), electric field generator (3), magnetic field generator (4), several cameras (6) and acquisition and analysis module (8) respectively. It is used to collect environmental data and images captured by the several cameras (6), and based on the environmental data, it controls the salt spray chamber (1), electric field generator (3) and magnetic field generator (4) to simulate the industrial atmosphere under the electromagnetic environment of the coast. At the same time, it sends the environmental data and images to the acquisition and analysis module (8). The acquisition and analysis module (8) is used to analyze and calculate the environmental data and images to obtain the corrosion resistance level of the electrical contact sample (2); The plurality of cameras (6) are installed in the salt spray chamber (1) for taking pictures of the surface of the electrical contact sample (2) placed in the salt spray chamber (1) at set time intervals; The environmental data includes: temperature, humidity, concentration of salt spray and other gases, electric field strength, and magnetic field strength.

2. The apparatus as claimed in claim 1, characterized in that, The magnetic field generator (4) is made of corrosion-resistant material.

3. The apparatus as described in claim 1, characterized in that, The magnetic field generator (4) includes: a Helmholtz coil; The Helmholtz coil is encapsulated in a corrosion-resistant material.

4. The apparatus as claimed in claim 1, characterized in that, The electric field generator (3) includes: two electrode plates, one positive and one negative; The positive and negative electrode plates are made of corrosion-resistant material, and the interface between the positive and negative electrode plates and the salt spray chamber (1) is sealed.

5. The apparatus as described in claim 4, characterized in that, The salt spray chamber (1) includes: an inner liner, and an atmospheric environment simulation module (9), a temperature control module (10), a dry and wet circulation module (11), and a sample rack installed in the inner liner; The atmospheric environment simulation module (9), temperature control module (10), and dry-wet cycle module (11) are all connected to the PLC control module (7) and controlled by the PLC control module (7); The sample holder is located between the positive and negative electrode plates and is used to fix the electrical contact sample (2).

6. The apparatus as claimed in claim 5, characterized in that, The inner liner is made of corrosion-resistant material.

7. The apparatus as claimed in claim 1, characterized in that, The PLC control module (7) includes: a temperature and humidity sensor, a salt spray and other gas concentration detection device, an electric field strength detection device, and a magnetic field strength detection device located in the salt spray chamber (1).

8. The apparatus as claimed in claim 1, characterized in that, The acquisition and analysis module (8) includes: a four-probe tester and an analysis device; The four-probe tester is located in the salt spray chamber (1) and is in contact with the electrical contact sample (2); The analysis device is connected to the four-probe tester and the PLC control module (7) respectively. It is used to receive environmental data, data related to the electrical contact sample (2) acquired by the four-probe tester and the image. It uses image recognition algorithm to quantify the degree of discoloration and discoloration area of ​​the silver plating layer of the electrical contact sample (2) compared with before the test. At the same time, it combines the received data to perform analysis and calculation to determine the corrosion resistance level of the electrical contact sample (2). The effect of the electromagnetic field on the corrosion resistance of the silver plating layer of the electrical contact sample (2) is represented by the influence factor of the electromagnetic field on corrosion behavior.

9. The apparatus as claimed in claim 8, characterized in that, The influence factor of the electromagnetic field on corrosion behavior is determined by the following formula: In the formula, EMIF is the influence factor of electromagnetic field on corrosion behavior, ΔR / R0 is the rate of change of contact resistance, and A corr i represents the percentage of the corroded area. corr t represents the corrosion current density and t represents the test duration.

10. The apparatus as claimed in claim 1, characterized in that, The device also includes: a safety protection module; The safety protection module is located outside the salt spray chamber (1) and is used for electromagnetic shielding, salt spray leakage detection and grounding protection.

11. A method for testing the corrosion resistance of silver plating on high-voltage disconnect switches under coastal electromagnetic environments, characterized in that... The method employs the corrosion resistance testing device for the silver plating layer of high-voltage disconnect switches under coastal electromagnetic environments as described in any one of claims 1-10 to conduct corrosion resistance testing of the silver plating layer of high-voltage disconnect switches under coastal electromagnetic environments. The method includes: Several electrical contact samples (2) of high-voltage disconnect switches were placed in the salt spray chamber (1) of the test device; The PLC control module (7) in the test device collects environmental data and images captured by several cameras (6), and sends them to the acquisition and analysis module (8) in the test device. Based on the environmental data, the PLC control module (7) adjusts the salt spray chamber (1), the electric field generator (3) and the magnetic field generator (4) in the test device to simulate the industrial atmosphere under the coastal electromagnetic environment, and conducts corrosion resistance test of the silver plating layer of the high voltage disconnect switch. The environmental data and the image are analyzed and calculated by the acquisition and analysis module (8) to obtain the corrosion resistance level of the electrical contact sample (2); The environmental data includes: temperature, humidity, concentration of salt spray and other gases, electric field strength, and magnetic field strength.

12. The method as described in claim 11, characterized in that, The process of acquiring environmental data and images captured by several cameras (6) through the PLC control module (7) in the testing device and sending them to the acquisition and analysis module (8) in the testing device includes: Environmental data is collected through the temperature and humidity sensor, salt spray and other gas concentration detection device, electric field strength detection device and magnetic field strength detection device in the PLC control module (7); The PLC control module (7) acquires images captured by the plurality of cameras (6); The environmental data and images are sent to the acquisition and analysis module (8) via the PLC control module (7).

13. The method as described in claim 11, characterized in that, Based on the environmental data, the PLC control module (7) adjusts the salt spray chamber (1), the electric field generator (3), and the magnetic field generator (4) in the testing device to simulate the industrial atmosphere under coastal electromagnetic environment, and conducts a corrosion resistance test on the silver plating layer of the high-voltage disconnector, including: Based on the temperature, humidity, and concentration of salt spray and other gases in the environmental data, the atmospheric environment simulation module (9), temperature control module (10), and dry-wet cycle module (11) in the salt spray chamber (1) are controlled by the PLC control module (7) to simulate pollutants in the coastal industrial atmosphere. Based on the electric field strength and magnetic field strength in the environmental data, the electric field generator (3) and magnetic field generator (4) are controlled by the PLC control module (7) to simulate the coastal electromagnetic environment in order to test the corrosion resistance of the silver plating layer of the high voltage disconnect switch in the industrial atmosphere of the coastal electromagnetic environment.

14. The method as described in claim 11, characterized in that, The process of analyzing and calculating the environmental data and images through the acquisition and analysis module (8) to obtain the corrosion resistance level of the electrical contact sample (2) includes: Based on the image, the analysis device in the acquisition and analysis module (8) uses an image recognition algorithm to quantify the degree of discoloration and the discoloration area of ​​the silver plating layer of the electrical contact sample (2) compared to before the test, and obtains the degree of discoloration and the discoloration area of ​​the silver plating layer of the electrical contact sample (2) compared to before the test. The contact resistance value of the electrical contact sample (2) is obtained by the four-probe tester in the acquisition and analysis module (8); Based on the environmental data, the contact resistance value of the electrical contact sample (2), the degree of discoloration and the discoloration area of ​​the silver plating layer of the electrical contact sample (2) compared to before the test, the corrosion area ratio, contact resistance change rate and corrosion current density are calculated by the analysis device to determine the influence of the electromagnetic field on the corrosion resistance of the silver plating layer of the electrical contact sample (2) and the corrosion resistance level of the electrical contact sample (2). The effect of the electromagnetic field on the corrosion resistance of the silver plating layer of the electrical contact sample (2) is represented by the influence factor of the electromagnetic field on corrosion behavior.

15. The method as described in claim 14, characterized in that, The influence factor of the electromagnetic field on corrosion behavior is determined by the following formula: In the formula, EMIF is the influence factor of electromagnetic field on corrosion behavior, ΔR / R0 is the rate of change of contact resistance, and A corr i represents the percentage of the corroded area. corr t represents the corrosion current density and t represents the test duration.

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