Method and device for accelerated degradation test of on-line monitoring equipment for insulating oil dissolved gases

Abstract

The application provides an insulation oil dissolved gas online monitoring equipment accelerated degradation test method and device thereof, which comprises a control system and a plurality of standard oil preparation units; the standard oil preparation units are connected with oil inlets of the insulation oil dissolved gas online monitoring equipment; an oil-filled electrical equipment is connected with the insulation oil dissolved gas online monitoring equipment, and the insulation oil dissolved gas online monitoring equipment is connected with a background remote control device; the control system controls a power supply circuit of the insulation oil dissolved gas online monitoring equipment to evaluate voltage sag monitoring capability, voltage random interruption monitoring capability or power fluctuation monitoring capability of the equipment; the control system controls opening and closing conditions of oil inlet valves and oil return valves of the oil-filled electrical equipment to evaluate oil passage blockage monitoring capability of the insulation oil dissolved gas online monitoring equipment; and the application can efficiently perform reliability evaluation on the insulation oil dissolved gas online monitoring equipment, control network quality of the device, and provide clear basis for supplier performance evaluation.

Description

Technical Field

[0001] This invention relates to the field of online monitoring technology for dissolved gases in large power transformer oil, and in particular to an accelerated degradation test method and apparatus for online monitoring equipment for dissolved gases in insulating oil. Background Technology

[0002] When an oil-filled power transformer experiences overheating or discharge faults during operation, the transformer oil around the fault point undergoes thermal decomposition due to overheating or arcing, producing seven characteristic gases: low-molecular-weight hydrocarbons (methane, ethane, ethylene, acetylene), hydrogen, carbon monoxide, and carbon dioxide. These free characteristic gases dissolve in the transformer oil. In normally operating oil-filled power transformers, due to the low temperature and absence of discharge, the dissolved characteristic gas components in the transformer oil are minimal. In particular, double-bonded acetylene, which requires higher energy to decompose, is not normally present. Online monitoring of dissolved gases in the transformer oil using insulating oil dissolved gas monitoring equipment can determine whether a fault has occurred inside the transformer, as well as the type and extent of the fault. However, due to varying quality among different manufacturers, some substandard online monitoring equipment exhibits increasingly larger monitoring errors after a period of operation due to its own defects and the influence of external environmental factors, severely affecting the accuracy of the test.

[0003] Online dissolved gas monitoring technology has become one of the most important means for monitoring the operating status, diagnosing faults, and predicting latent faults in oil-filled electrical equipment such as transformers and reactors, and is widely used. It is particularly effective in sensitively and reliably detecting overheating, arcing, and insulation destructive faults. However, in actual operation, it also suffers from prominent problems such as high failure rates, low accuracy, and numerous false alarms, significantly impacting its practical application. Although power grid companies have increased their efforts to test the initial pass rate of equipment, requiring accuracy and repeatability tests on every piece of equipment connected to the grid, the long-term stability and reliability of online equipment cannot be evaluated through such tests.

[0004] Compared to commonly used electronic products, online monitoring equipment for dissolved gases in insulating oil is a large-scale, fully automated testing device. It is complex in structure and expensive, and the sample size is relatively limited. Using high-acceleration limit testing or extreme destructive testing for reliability assessment would lead to excessively high testing costs. Therefore, time compression and event compression testing are the most suitable methods. The online monitoring equipment for dissolved gases in insulating oil mainly consists of four parts: an oil-gas separation device, a gas separation unit, a gas detection unit, and a main control unit. These four parts contain thousands of components, and the degradation characteristics of different components are extremely complex.

[0005] How to quickly, comprehensively, and accurately evaluate the reliability of a certain type of online gas monitoring equipment in oil is an urgent problem to be solved.

[0006] The accelerated degradation test device and accelerated degradation test method for online monitoring equipment of the present invention conduct high-frequency, high-intensity operational tests on the online monitoring equipment for dissolved gas in insulating oil under test within a short period of time, as well as assessment tests for various external adverse event factors. That is, it aims to achieve the results that would otherwise require long-term assessment tests through short-term assessment tests of multiple adverse factors with time and event compression. This accelerated degradation test on the online monitoring equipment for dissolved gas in insulating oil serves to eliminate inferior online monitoring equipment, ensure the procurement and use of qualified online monitoring equipment, and effectively guarantee the safe operation of oil-filled power transformers in the power grid. Summary of the Invention

[0007] This invention proposes an accelerated degradation test method and apparatus for online monitoring equipment of dissolved gases in insulating oil. It can efficiently conduct reliability assessment and network access quality control of online monitoring equipment of dissolved gases in insulating oil, and provide a clear basis for supplier performance evaluation.

[0008] The present invention adopts the following technical solution.

[0009] An accelerated degradation test device for online monitoring of dissolved gases in insulating oil includes a control system and multiple standard oil preparation units for preparing standard oil samples of different concentrations. The standard oil preparation unit and the connecting valve unit of the oil-filled electrical equipment are connected to the oil inlet of the online monitoring device for dissolved gases in the insulating oil to be tested via an oil circuit control unit and pipelines. The online monitoring device for dissolved gases in the insulating oil is connected to a background remote control device that is connected to the background software of the control system.

[0010] The background remote control device includes a switching oil circuit control unit, as well as a voltage regulator, current regulator, capacitive reactance regulator, and inductive reactance regulator located in the power supply circuit. The control system controls the power supply circuit of the oil-filled electrical equipment and the online monitoring equipment for dissolved gas in insulating oil through the background remote control device. On the one hand, it enables the oil-filled electrical equipment to work under test conditions to generate test characteristic gases dissolved in insulating oil. On the other hand, it evaluates the voltage sag monitoring capability, random voltage interruption monitoring capability, or power fluctuation monitoring capability of the online monitoring equipment for dissolved gas in insulating oil through accelerated degradation of the test conditions.

[0011] The control system controls the opening and closing of the oil inlet valve and oil return valve of the oil-filled electrical equipment through the switching oil circuit control unit in order to evaluate the oil circuit blockage monitoring capability of the online monitoring equipment for dissolved gas in insulating oil.

[0012] The oil-filled electrical equipment includes an oil-filled transformer or an oil-filled reactor for testing.

[0013] The test apparatus also includes an accelerated degradation test device connected to an online monitoring device for dissolved gases in insulating oil; the accelerated degradation test device performs accelerated degradation treatment on the online monitoring device for dissolved gases in insulating oil under test.

[0014] The online monitoring equipment for dissolved gases in insulating oil includes a high-precision chromatography calibration device, a standard oil preparation unit, an environmental test chamber, a control system, and a power regulation device.

[0015] The online monitoring equipment for dissolved gases in insulating oil is installed near the large oil-filled transformer used for testing. An oil sampling valve is installed at the bottom of the oil-filled transformer. The online monitoring equipment for dissolved gases in insulating oil takes oil samples from the transformer oil inside the test transformer through the sampling valve and monitors the content of characteristic gas components contained in the oil samples online.

[0016] The power supply circuit of the oil-filled oil-gas equipment includes a power regulating device, which is electrically connected to the input terminal of the large oil-filled transformer. The power regulating device regulates the test transformer to operate under various abnormal conditions, causing the insulating oil inside the test transformer to undergo pyrolysis or cracking, generating a large amount of characteristic gas required for the test and dissolving it in the transformer oil.

[0017] The standard oil preparation unit includes a high-concentration standard oil sample preparation tank, a medium-concentration standard oil sample preparation tank, and a low-concentration standard oil sample preparation tank. It is connected to the online monitoring equipment for dissolved gas of the insulating oil under test and is used to prepare standard oil samples of different concentrations for use as insulating oil samples in the test process.

[0018] Multiple standard oil preparation units are configured in parallel and connected to different online monitoring devices for dissolved gases in insulating oil via connecting valve units;

[0019] The accelerated degradation test includes the following steps;

[0020] Step A1: Under the control of the control system, the tested online monitoring equipment for dissolved gas in insulating oil is first subjected to accelerated aging treatment. The accelerated aging treatment method includes using the tested online monitoring equipment for dissolved gas in insulating oil to conduct high-frequency and high-intensity online monitoring tests on the characteristic gas components dissolved in the transformer oil filled inside the large oil-filled test transformer at least once per hour and continuously for at least 10 days, so as to accelerate the degradation of the tested online monitoring equipment for dissolved gas in insulating oil.

[0021] Step A2: Perform the insulating oil sample testing procedure to evaluate the performance of the online dissolved gas monitoring equipment for insulating oil after accelerated degradation treatment. Specifically, the online dissolved gas monitoring equipment for insulating oil after accelerated degradation treatment is used to test high-concentration, medium-concentration, and low-concentration standard oil samples provided by the connected standard oil preparation unit. The test results are compared with the test results of the high-precision chromatography calibration device. If the results exceed the detection error range of the high-precision chromatography calibration device, the online chromatographic monitoring system or the online spectral monitoring system is deemed unqualified; otherwise, it is deemed qualified. This serves as a time compression test to evaluate the monitoring accuracy and precision of the online dissolved gas monitoring equipment for insulating oil.

[0022] The standard oil preparation unit is connected to the control system and the online monitoring equipment for dissolved gases in the insulating oil under test. The high-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved high-concentration component characteristic gases, the medium-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved medium-concentration component characteristic gases, and the low-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved low-concentration component characteristic gases. During the test, the oil circuit switching control unit is used to switch the different oil circuit connection states when the oil circuit of the online monitoring equipment for dissolved gases in the insulating oil under test is connected to the test transformer and the standard oil sample preparation tanks for high, medium, and low concentration component characteristic gases.

[0023] During the accelerated degradation test, the online monitoring equipment for dissolved gases in the insulating oil under test, the large oil-filled transformer used for the test, and the standard oil sample preparation tanks for high, medium, and low concentration components of characteristic gases in the standard oil preparation unit are connected to the background remote control device of the control system background software.

[0024] The control system controls the power supply circuit of the online monitoring equipment for dissolved gas in insulating oil via a remote control device in order to evaluate the equipment's ability to monitor voltage dips, random voltage interruptions, or power fluctuations.

[0025] The standard oil preparation unit includes an oil sample preparation unit for preparing low, medium, and high concentration oil samples respectively. The standard oil samples prepared by the unit are input into the dissolved gas online monitoring device of the insulating oil under test during the test, and serve as calibration oil samples used by the dissolved gas online monitoring device during the test. The oil sample preparation unit also includes a standard oil sample storage device, which serves as the source of standard oil samples for the long-term continuous operation of the dissolved gas online monitoring device.

[0026] The transformer and standard oil sample preparation tank used for testing are configured in parallel and connected to different online monitoring devices for dissolved gas in insulating oil through connecting valve units.

[0027] The transformer used for testing can serve as a large-capacity standard oil sample storage device during testing, and as a source of standard oil samples for long-term continuous operation of dissolved gas online monitoring equipment;

[0028] When preparing standard component characteristic gas concentration oil samples, the quantitative standard gas method is adopted. Based on the volume and concentration of oil in the oil storage tank and the concentration parameters of the standard oil sample to be prepared, the software calculates the amount of standard characteristic gas required to prepare the standard oil sample of the required concentration. Then, the corresponding volume of standard characteristic gas is introduced, and through pressurization, heating, and system oil and gas circulation, it is rapidly dissolved in the transformer blank oil. After full equilibrium, the standard oil sample is finally obtained.

[0029] After the standard oil is prepared, the oil circuit control unit is controlled by the remote transmission command of the background remote control device, which controls the test transformer and the switching and cleaning of the oil inlet and return pipelines of the standard oil sample preparation tanks for high, medium and low concentration component characteristic gases.

[0030] After the standard oil is prepared, the concentration of the oil is calibrated using a high-precision chromatographic calibration device, and the calibration concentration measurement results are uploaded to the background remote control device for use as reference oil data for verification.

[0031] When the standard oil sample storage device requires an extra-large capacity standard oil sample storage space, the transformer used for the experiment shall be a full-scale 110kV or higher-level oil-filled power transformer as the standard oil sample storage device.

[0032] The standard oil preparation unit is used to output pipelines for low, medium, and high concentration oil samples, as well as the pipelines for the test transformer to output ultra-large capacity standard oil samples. They are all connected to the control device, and the remote control device in the background controls the oil circuit switching to automatically switch and uniformly output standard oil samples to each of the tested online monitoring devices for dissolved gas in insulating oil.

[0033] An accelerated degradation test method for an online monitoring device for dissolved gases in insulating oil, comprising performing a time compression test or an event compression test on the online monitoring device for dissolved gases in insulating oil;

[0034] The time compression test refers to setting the detection cycle of the online monitoring equipment for dissolved gases in insulating oil to the shortest possible value during the test, and running the test continuously for the specified time according to the set detection cycle.

[0035] The event compression test refers to the process of subjecting the online monitoring equipment for dissolved gases in insulating oil to saturation concentration overload events, high boiling point component accumulation events, power sag events, oil circuit blockage events, oil circuit venting events, random voltage interruption events, power fluctuation events, and environmental noise interference events within a specified time during the test.

[0036] After performing a time compression test or an event compression test, the accelerated degradation test method further tests the basic indicators of accuracy, repeatability, and minimum detection concentration of the online monitoring equipment for dissolved gases in insulating oil.

[0037] The test method involves conducting accelerated degradation tests on the online monitoring equipment for dissolved gases in insulating oil under test through various tests and simulated field operating environments. The test results from online monitoring are used to comprehensively determine whether the field operation reliability and measurement accuracy of the online monitoring equipment for dissolved gases in insulating oil meet the network access requirements.

[0038] The experimental method workflow sequence includes time compression test, event compression test, measurement accuracy test, measurement repeatability test, minimum detection concentration test, resolution or cross-response test, response time, and other correlation tests;

[0039] When time compression tests are combined with environmental accelerated degradation tests, the environmental accelerated degradation tests include: salt spray environment accelerated degradation tests, chemical pollution environment accelerated degradation tests, high altitude environment accelerated degradation tests, and high temperature and high humidity environment accelerated degradation tests.

[0040] The event compression test includes a saturation concentration overload event, which is simulated in the test to make the concentration of the index gas or the concentration of the gas extracted from the oil reach 5-10 times the normal concentration, or reach the saturation concentration, so as to overload the chromatographic column / gas sensor of the online monitoring equipment for dissolved gases in the insulating oil under test, and accelerate the aging of the chromatographic column and detector.

[0041] The event compression test includes a high-boiling-point component accumulation event, which is simulated in the test by adding characteristic gaseous components of high-carbon hydrocarbons C3, C4, C5, acetone or methanol to a standard gas or oil sample.

[0042] During the experiment, the cumulative events of high-boiling-point components and the accelerated degradation effect of low-carbon hydrocarbon C3, C4, and C5 saturated concentration components on the online monitoring equipment for dissolved gases in insulating oil were as follows:

[0043] A. These components accumulate in the chromatographic column of the online monitoring equipment for dissolved gases in insulating oil, causing a degradation in separation performance;

[0044] B. After such components slowly flow out of the chromatographic column of the online monitoring equipment for dissolved gases in insulating oil, they also carbonize and deposit on the sensor's active surface, causing the sensor's response performance to degrade.

[0045] C. For online monitoring equipment for dissolved gases in insulating oil, such high-boiling-point substances gradually deposit into the optical window, causing additional absorption, changing the energy distribution of the light source, generating cross-interference, and affecting the detection accuracy of online monitoring equipment for transformers.

[0046] The oil circuit blockage event and oil circuit venting event in the event compression test refer to the simulation test in which the oil inlet and outlet pipelines of the oil-filled electrical equipment are closed or vented, and the online monitoring equipment for dissolved gas in insulating oil is recorded to see if it can correctly identify or alarm, and the sampling process is stopped in time until the fault is eliminated. Alternatively, it can be used to examine the sensitivity of the working status of the online monitoring equipment for dissolved gas in insulating oil under test and the accuracy of the remote daily work report.

[0047] The power sag event in the event compression test is controlled and adjusted by a remote control device in the background during the test. The control range includes the control and use of voltage regulators, current regulators, capacitive reactance regulators, and inductive reactance regulators.

[0048] The random voltage interruption event in the event compression test is to cut off the power to oil-filled electrical equipment in any operating state, and perform no less than 24 operations within 72 hours.

[0049] The power fluctuation event in the event compression test is controlled by the background software to control the voltage regulator, current regulator, capacitive reactance regulator, and inductive reactance regulator to make the working voltage of the oil-filled electrical equipment fluctuate within the dynamic threshold range of AC185V~265V, and to adjust the current, capacitive reactance and inductive reactance within the preset range, so as to examine the repeatability and measurement error of the monitoring data of the online monitoring equipment for dissolved gas in insulating oil.

[0050] The test process examines the communication, working status, and remote transmission of daily work reports of the online monitoring equipment for dissolved gas in insulating oil under test through voltage sag events, random voltage interruption events, and power fluctuation events.

[0051] The environmental noise interference events in the event compression test refer to the noise or artificial vibration and sound generated by transformers, reactors, and ventilation fans in the substation that are simulated during the test process. The transformer body noise is the noise generated by the periodic vibration of the iron core due to the magnetostriction of the internal silicon steel sheets, as well as the vibration noise generated by the electromagnetic force on the winding coil due to the change of magnetic leakage over time when current passes through. The reactor noise is the noise generated by the reactor iron core due to magnetostriction and the vibration of the winding coil. The ventilation fan noise is the aerodynamic noise caused by the rotation of the fan blades, as well as the mechanical noise generated by the motor or other components of the fan during operation.

[0052] During the test, the online monitoring equipment for dissolved gas in insulating oil is connected to the test transformer used for storing ultra-large capacity standard oil samples. After a preset duration or number of consecutive extreme runs, it automatically switches to the low, medium, and high concentration oil sample configuration unit to perform quantitative evaluation of the online monitoring equipment for dissolved gas in insulating oil under test in terms of accuracy, response time, minimum detection concentration, separation degree, or cross-response test performance, and then conducts the next round of continuous extreme runs.

[0053] The background remote control device simultaneously connects to multiple online monitoring devices for dissolved gases in insulating oil, automatically completes time compression and event compression tests, performs failure analysis on the equipment, and determines the equipment reliability;

[0054] The background remote control device sends remote control commands to multiple online monitoring devices for dissolved gases in insulating oil, issuing start, stop, and periodic commands to evaluate the communication, working status, daily remote work reports, measurement results, and spectra of the online monitoring devices for dissolved gases in insulating oil.

[0055] After extensive experimental research on a real-world testing platform, this invention constructs a suitable reliability testing model with time compression and event compression, and determines the performance degradation law and quantitative assessment threshold of online monitoring equipment under accelerated testing conditions.

[0056] This invention addresses the gaps in reliability testing and quality control of existing online dissolved gas monitoring equipment for insulating oil. Extensive experimental research was conducted, and suitable reliability testing models with time compression and event compression were constructed. The performance degradation law and quantitative assessment threshold of online dissolved gas monitoring equipment for insulating oil under accelerated testing conditions were determined. Based on this, a method and platform device for accelerated degradation testing are proposed. This method and platform device can efficiently provide clear evidence for the reliability evaluation of online dissolved gas monitoring equipment for insulating oil, the quality control of equipment entering the network, and the performance evaluation of suppliers.

[0057] This invention establishes a reliability testing platform for a full-scale test field monitoring device, adopts a suitable reliability testing model with time compression and event compression, extracts the main performance and quality characteristics affecting the reliability of online monitoring equipment for dissolved gases in insulating oil, screens the main characteristic quantities for evaluating new devices, and finally establishes a quantifiable comprehensive evaluation standard for the device. This provides theoretical and technical guidance for the long-term reliability evaluation of online monitoring equipment for dissolved gases in insulating oil, the improvement of the performance of online monitoring equipment for dissolved gases in insulating oil, the quality control of online monitoring equipment for network access, and the performance evaluation of suppliers. Attached Figure Description

[0058] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0059] AppendixFigure 1 This is a schematic diagram of the platform architecture design of the present invention (taking four online monitoring devices for dissolved gases in insulating oil as an example).

[0060] Appendix Figure 2 This is a schematic diagram of the platform communication design of the present invention (taking four online monitoring devices for dissolved gases in insulating oil as an example).

[0061] Appendix Figure 3 This is a schematic diagram of the hardware and software control system principle of the present invention. Detailed Implementation

[0062] As shown in the figure, the accelerated degradation test device for online monitoring of dissolved gas in insulating oil includes a control system and multiple standard oil preparation units for preparing standard oil samples of different concentrations. The standard oil preparation unit and the connecting valve unit of the oil-filled electrical equipment are connected to the oil inlet of the online monitoring device for dissolved gas in insulating oil to be tested via an oil circuit control unit and pipelines. The online monitoring device for dissolved gas in insulating oil is connected to the background remote control device that is connected to the background software of the control system.

[0063] The background remote control device includes a switching oil circuit control unit, as well as a voltage regulator, current regulator, capacitive reactance regulator, and inductive reactance regulator located in the power supply circuit. The control system controls the power supply circuit of the oil-filled electrical equipment and the online monitoring equipment for dissolved gas in insulating oil through the background remote control device. On the one hand, it enables the oil-filled electrical equipment to work under test conditions to generate test characteristic gases dissolved in insulating oil. On the other hand, it evaluates the voltage sag monitoring capability, random voltage interruption monitoring capability, or power fluctuation monitoring capability of the online monitoring equipment for dissolved gas in insulating oil through accelerated degradation of the test conditions.

[0064] The control system controls the opening and closing of the oil inlet valve and oil return valve of the oil-filled electrical equipment through the switching oil circuit control unit in order to evaluate the oil circuit blockage monitoring capability of the online monitoring equipment for dissolved gas in insulating oil.

[0065] The oil-filled electrical equipment includes an oil-filled transformer or an oil-filled reactor for testing.

[0066] The test apparatus also includes an accelerated degradation test device connected to an online monitoring device for dissolved gases in insulating oil; the accelerated degradation test device performs accelerated degradation treatment on the online monitoring device for dissolved gases in insulating oil under test.

[0067] The online monitoring equipment for dissolved gases in insulating oil includes a high-precision chromatography calibration device, a standard oil preparation unit, an environmental test chamber, a control system, and a power regulation device.

[0068] The online monitoring equipment for dissolved gases in insulating oil is installed near the large oil-filled transformer used for testing. An oil sampling valve is installed at the bottom of the oil-filled transformer. The online monitoring equipment for dissolved gases in insulating oil takes oil samples from the transformer oil inside the test transformer through the sampling valve and monitors the content of characteristic gas components contained in the oil samples online.

[0069] The power supply circuit of the oil-filled oil-gas equipment includes a power regulating device, which is electrically connected to the input terminal of the large oil-filled transformer. The power regulating device regulates the test transformer to operate under various abnormal conditions, causing the insulating oil inside the test transformer to undergo pyrolysis or cracking, generating a large amount of characteristic gas required for the test and dissolving it in the transformer oil.

[0070] The standard oil preparation unit includes a high-concentration standard oil sample preparation tank, a medium-concentration standard oil sample preparation tank, and a low-concentration standard oil sample preparation tank. It is connected to the online monitoring equipment for dissolved gas of the insulating oil under test and is used to prepare standard oil samples of different concentrations for use as insulating oil samples in the test process.

[0071] Multiple standard oil preparation units are configured in parallel and connected to different online monitoring devices for dissolved gases in insulating oil via connecting valve units;

[0072] The accelerated degradation test includes the following steps;

[0073] Step A1: Under the control of the control system, the tested online monitoring equipment for dissolved gas in insulating oil is first subjected to accelerated aging treatment. The accelerated aging treatment method includes using the tested online monitoring equipment for dissolved gas in insulating oil to conduct high-frequency and high-intensity online monitoring tests on the characteristic gas components dissolved in the transformer oil filled inside the large oil-filled test transformer at least once per hour and continuously for at least 10 days, so as to accelerate the degradation of the tested online monitoring equipment for dissolved gas in insulating oil.

[0074] Step A2: Perform the insulating oil sample testing procedure to evaluate the performance of the online dissolved gas monitoring equipment for insulating oil after accelerated degradation treatment. Specifically, the online dissolved gas monitoring equipment for insulating oil after accelerated degradation treatment is used to test high-concentration, medium-concentration, and low-concentration standard oil samples provided by the connected standard oil preparation unit. The test results are compared with the test results of the high-precision chromatography calibration device. If the results exceed the detection error range of the high-precision chromatography calibration device, the online chromatographic monitoring system or the online spectral monitoring system is deemed unqualified; otherwise, it is deemed qualified. This serves as a time compression test to evaluate the monitoring accuracy and precision of the online dissolved gas monitoring equipment for insulating oil.

[0075] The standard oil preparation unit is connected to the control system and the online monitoring equipment for dissolved gases in the insulating oil under test. The high-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved high-concentration component characteristic gases, the medium-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved medium-concentration component characteristic gases, and the low-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved low-concentration component characteristic gases. During the test, the oil circuit switching control unit is used to switch the different oil circuit connection states when the oil circuit of the online monitoring equipment for dissolved gases in the insulating oil under test is connected to the test transformer and the standard oil sample preparation tanks for high, medium, and low concentration component characteristic gases.

[0076] During the accelerated degradation test, the online monitoring equipment for dissolved gases in the insulating oil under test, the large oil-filled transformer used for the test, and the standard oil sample preparation tanks for high, medium, and low concentration components of characteristic gases in the standard oil preparation unit are connected to the background remote control device of the control system background software.

[0077] The control system controls the power supply circuit of the online monitoring equipment for dissolved gas in insulating oil via a remote control device in order to evaluate the equipment's ability to monitor voltage dips, random voltage interruptions, or power fluctuations.

[0078] The standard oil preparation unit includes an oil sample preparation unit for preparing low, medium, and high concentration oil samples respectively. The standard oil samples prepared by the unit are input into the dissolved gas online monitoring device of the insulating oil under test during the test, and serve as calibration oil samples used by the dissolved gas online monitoring device during the test. The oil sample preparation unit also includes a standard oil sample storage device, which serves as the source of standard oil samples for the long-term continuous operation of the dissolved gas online monitoring device.

[0079] The transformer and standard oil sample preparation tank used for testing are configured in parallel and connected to different online monitoring devices for dissolved gas in insulating oil through connecting valve units.

[0080] The transformer used for testing can serve as a large-capacity standard oil sample storage device during testing, and as a source of standard oil samples for long-term continuous operation of dissolved gas online monitoring equipment;

[0081] When preparing standard component characteristic gas concentration oil samples, the quantitative standard gas method is adopted. Based on the volume and concentration of oil in the oil storage tank and the concentration parameters of the standard oil sample to be prepared, the software calculates the amount of standard characteristic gas required to prepare the standard oil sample of the required concentration. Then, the corresponding volume of standard characteristic gas is introduced, and through pressurization, heating, and system oil and gas circulation, it is rapidly dissolved in the transformer blank oil. After full equilibrium, the standard oil sample is finally obtained.

[0082] After the standard oil is prepared, the oil circuit control unit is controlled by the remote transmission command of the background remote control device, which controls the test transformer and the switching and cleaning of the oil inlet and return pipelines of the standard oil sample preparation tanks for high, medium and low concentration component characteristic gases.

[0083] After the standard oil is prepared, the concentration of the oil is calibrated using a high-precision chromatographic calibration device, and the calibration concentration measurement results are uploaded to the background remote control device for use as reference oil data for verification.

[0084] When the standard oil sample storage device requires an extra-large capacity standard oil sample storage space, the transformer used for the experiment shall be a full-scale 110kV or higher-level oil-filled power transformer as the standard oil sample storage device.

[0085] The standard oil preparation unit is used to output pipelines for low, medium, and high concentration oil samples, as well as the pipelines for the test transformer to output ultra-large capacity standard oil samples. They are all connected to the control device, and the remote control device in the background controls the oil circuit switching to automatically switch and uniformly output standard oil samples to each of the tested online monitoring devices for dissolved gas in insulating oil.

[0086] An accelerated degradation test method for an online monitoring device for dissolved gases in insulating oil, comprising performing a time compression test or an event compression test on the online monitoring device for dissolved gases in insulating oil;

[0087] The time compression test refers to setting the detection cycle of the online monitoring equipment for dissolved gases in insulating oil to the shortest possible value during the test, and running the test continuously for the specified time according to the set detection cycle.

[0088] The event compression test refers to the process of subjecting the online monitoring equipment for dissolved gases in insulating oil to saturation concentration overload events, high boiling point component accumulation events, power sag events, oil circuit blockage events, oil circuit venting events, random voltage interruption events, power fluctuation events, and environmental noise interference events within a specified time during the test.

[0089] After performing a time compression test or an event compression test, the accelerated degradation test method further tests the basic indicators of accuracy, repeatability, and minimum detection concentration of the online monitoring equipment for dissolved gases in insulating oil.

[0090] The test method involves conducting accelerated degradation tests on the online monitoring equipment for dissolved gases in insulating oil under test through various tests and simulated field operating environments. The test results from online monitoring are used to comprehensively determine whether the field operation reliability and measurement accuracy of the online monitoring equipment for dissolved gases in insulating oil meet the network access requirements.

[0091] The experimental method workflow sequence includes time compression test, event compression test, measurement accuracy test, measurement repeatability test, minimum detection concentration test, resolution or cross-response test, response time, and other correlation tests;

[0092] When time compression tests are combined with environmental accelerated degradation tests, the environmental accelerated degradation tests include: salt spray environment accelerated degradation tests, chemical pollution environment accelerated degradation tests, high altitude environment accelerated degradation tests, and high temperature and high humidity environment accelerated degradation tests.

[0093] The event compression test includes a saturation concentration overload event, which is simulated in the test to make the concentration of the index gas or the concentration of the gas extracted from the oil reach 5-10 times the normal concentration, or reach the saturation concentration, so as to overload the chromatographic column / gas sensor of the online monitoring equipment for dissolved gases in the insulating oil under test, and accelerate the aging of the chromatographic column and detector.

[0094] The event compression test includes a high-boiling-point component accumulation event, which is simulated in the test by adding characteristic gas components such as high-carbon hydrocarbons C3, C4, C5, acetone or methanol to a standard gas or oil sample.

[0095] During the experiment, the cumulative events of high-boiling-point components and the accelerated degradation effect of low-carbon hydrocarbon C3, C4, and C5 saturated concentration components on the online monitoring equipment for dissolved gases in insulating oil were as follows:

[0096] A. These components accumulate in the chromatographic column of the online monitoring equipment for dissolved gases in insulating oil, causing a degradation in separation performance;

[0097] B. After such components slowly flow out of the chromatographic column of the online monitoring equipment for dissolved gases in insulating oil, they also carbonize and deposit on the sensor's active surface, causing the sensor's response performance to degrade.

[0098] C. For online monitoring equipment for dissolved gases in insulating oil, such high-boiling-point substances gradually deposit into the optical window, causing additional absorption, changing the energy distribution of the light source, generating cross-interference, and affecting the detection accuracy of online monitoring equipment for transformers.

[0099] The oil circuit blockage event and oil circuit venting event in the event compression test refer to the simulation test in which the oil inlet and outlet pipelines of the oil-filled electrical equipment are closed or vented, and the online monitoring equipment for dissolved gas in insulating oil is recorded to see if it can correctly identify or alarm, and the sampling process is stopped in time until the fault is eliminated. Alternatively, it can be used to examine the sensitivity of the working status of the online monitoring equipment for dissolved gas in insulating oil under test and the accuracy of the remote daily work report.

[0100] The power sag event in the event compression test is controlled and adjusted by a remote control device in the background during the test. The control range includes the control and use of voltage regulators, current regulators, capacitive reactance regulators, and inductive reactance regulators.

[0101] The random voltage interruption event in the event compression test is to cut off the power to oil-filled electrical equipment in any operating state, and perform no less than 24 operations within 72 hours.

[0102] The power fluctuation event in the event compression test is controlled by the background software to control the voltage regulator, current regulator, capacitive reactance regulator, and inductive reactance regulator to make the working voltage of the oil-filled electrical equipment fluctuate within the dynamic threshold range of AC185V~265V, and to adjust the current, capacitive reactance and inductive reactance within the preset range, so as to examine the repeatability and measurement error of the monitoring data of the online monitoring equipment for dissolved gas in insulating oil.

[0103] The test process examines the communication, working status, and remote transmission of daily work reports of the online monitoring equipment for dissolved gas in insulating oil under test through voltage sag events, random voltage interruption events, and power fluctuation events.

[0104] The environmental noise interference events in the event compression test refer to the noise or artificial vibration and sound generated by transformers, reactors, and ventilation fans in the substation that are simulated during the test process. The transformer body noise is the noise generated by the periodic vibration of the iron core due to the magnetostriction of the internal silicon steel sheets, as well as the vibration noise generated by the electromagnetic force on the winding coil due to the change of magnetic leakage over time when current passes through. The reactor noise is the noise generated by the reactor iron core due to magnetostriction and the vibration of the winding coil. The ventilation fan noise is the aerodynamic noise caused by the rotation of the fan blades, as well as the mechanical noise generated by the motor or other components of the fan during operation.

[0105] During the test, the online monitoring equipment for dissolved gas in insulating oil is connected to the test transformer used for storing ultra-large capacity standard oil samples. After a preset duration or number of consecutive extreme runs, it automatically switches to the low, medium, and high concentration oil sample configuration unit to perform quantitative evaluation of the online monitoring equipment for dissolved gas in insulating oil under test in terms of accuracy, response time, minimum detection concentration, separation degree, or cross-response test performance, and then conducts the next round of continuous extreme runs.

[0106] The background remote control device simultaneously connects to multiple online monitoring devices for dissolved gases in insulating oil, automatically completes time compression and event compression tests, performs failure analysis on the equipment, and determines the equipment reliability;

[0107] The background remote control device sends remote control commands to multiple online monitoring devices for dissolved gases in insulating oil, issuing start, stop, and periodic commands to evaluate the communication, working status, daily remote work reports, measurement results, and spectra of the online monitoring devices for dissolved gases in insulating oil.

[0108] Example:

[0109] In this example, the accelerated degradation test apparatus includes: a high-precision chromatographic calibration device, a test transformer, a high-concentration standard oil sample preparation tank, a medium-concentration standard oil sample preparation tank, a low-concentration standard oil sample preparation tank, an environmental test chamber, a control system, a power supply regulation device, etc.

[0110] The functions of the above-mentioned device are briefly described below:

[0111] 1. High-precision chromatography calibration device: used to detect the content of characteristic gas components in test transformers, high-concentration standard oil sample preparation tanks, medium-concentration standard oil sample preparation tanks, and low-concentration standard oil sample preparation tanks, and to use these detection data as standards to compare with online monitoring equipment for dissolved gases in insulating oil.

[0112] 2. Test Transformer: A full-scale 110kV or higher oil-filled power transformer is used as a large-capacity standard oil sample storage device, serving as the source of standard oil samples for the long-term continuous operation of the dissolved gas online monitoring equipment. Depending on the needs of the high-boiling-point component accumulation event test, high concentrations of standard gases or characteristic gas components such as high-carbon hydrocarbons (C3, C4, C5), acetone, and methanol can be added to the oil sample.

[0113] 3. High-concentration standard oil sample preparation tank, medium-concentration standard oil sample preparation tank, and low-concentration standard oil sample preparation tank: The corresponding volume of standard characteristic gas is introduced, and the oil and gas are circulated through a pressurization and heating system to quickly dissolve the gas in the transformer blank oil. After full equilibrium, the standard oil sample is finally obtained. It is used to test the accuracy, repeatability, minimum detection concentration, separation degree or cross-response test, response time, and other related basic performance indicators of the online monitoring equipment for dissolved gas in insulating oil after performing time compression test or event compression test.

[0114] 4. Environmental test chamber: simulates environmental noise interference, salt spray environment, chemical pollution environment, high altitude environment, high temperature and high humidity environment, etc. in event compression test.

[0115] 5. Control system: including oil circuit control unit or module, power supply control unit or module, and remote control device.

[0116] (1) Oil circuit control unit or module: The oil outlet and return oil pipelines of the test transformer, as well as the standard oil sample preparation tanks for high, medium and low concentration component characteristic gases, are uniformly connected to the oil circuit control unit or module of the control system, and switched to the corresponding test oil circuit according to the test requirements.

[0117] (2) Power control unit or module: connected to the power supply circuit of the online monitoring equipment for dissolved gas in insulating oil, triggering events such as voltage dips, random voltage interruptions or power fluctuations.

[0118] (3) Back-end remote control device: uniformly issues start, stop and cycle commands to multiple online monitoring devices for dissolved gases in insulating oil, collects communication, working status, daily remote work reports, measurement results, spectrum, etc. of the online monitoring devices for dissolved gases in insulating oil, performs failure analysis on the online monitoring devices for dissolved gases in insulating oil, and determines the reliability of the devices.

[0119] 6. Power supply regulation device: including voltage regulator, current regulator, capacitive reactance regulator, and inductive reactance regulator. Its functions include the following two aspects:

[0120] (1) As a simulated power source for internal faults of the test transformer: It is electrically connected to the input end of the test transformer. The test transformer is adjusted by the power supply regulating device to operate under various abnormal conditions, so that the transformer oil inside the test transformer undergoes pyrolysis or cracking, generating a large amount of characteristic gas. These characteristic gases are dissolved in the transformer oil in large quantities and used as a storage device for ultra-large capacity standard oil samples. After the concentration is set by a high-precision chromatography calibration device, it serves as the source of standard oil samples for long-term continuous operation of the dissolved gas online monitoring equipment.

[0121] (2) As a simulated power supply for the online monitoring of dissolved gas in insulating oil: The power conditioning device is connected to the power control unit or module of the control system. The power control unit or module controls the power supply circuit of the online monitoring of dissolved gas in insulating oil to evaluate the voltage sag monitoring capability, random voltage interruption monitoring capability, or power fluctuation monitoring capability of the online monitoring of dissolved gas in insulating oil.

[0122] This example provides a method and platform device for accelerating the degradation test of an online monitoring device for dissolved gases in insulating oil.

[0123] This example involves an on-site accelerated degradation test platform for an online dissolved gas monitoring device in transformer oil. The test platform mainly consists of three oil sample preparation systems and one large transformer (large oil storage tank), inlet and return oil lines, oil sample cleaning, an online chromatographic calibration device, and an oil circuit control device. The oil sample preparation system prepares three standard oil sample concentrations, which serve as calibration oil samples for the online dissolved gas monitoring device. The inlet and return oil lines provide oil samples for the accelerated degradation test of the online dissolved gas monitoring device. The large transformer (large oil storage tank) provides oil samples with relatively fixed concentrations for long-term continuous operation of the online dissolved gas monitoring device. The online chromatographic calibration device is used to set the concentrations of the oil samples prepared by the standard oil sample preparation devices and the oil samples from the large transformer (large oil storage tank). The oil circuit control device controls oil sample switching and cleaning.

[0124] Accelerated degradation testing methods include: 1) time compression testing, which involves setting the detection cycle to the shortest possible time and running continuously for a specified period; and 2) event compression testing, which involves forcibly subjecting the following events within a specified timeframe: power sag, oil circuit blockage, random voltage interruption, power fluctuation, and environmental noise interference. After the time compression and event compression tests, basic indicators such as accuracy, repeatability, and minimum detection concentration are then tested.

[0125] The accelerated degradation test platform includes 1) a switch, 2) a connecting valve unit, 3) a standard oil preparation unit, 4) an oil circuit control unit, and 5) background software. This device can simultaneously connect to multiple online dissolved gas monitoring devices in the oil, automatically complete time compression and event compression tests, perform failure analysis on the equipment, and determine the equipment reliability.

[0126] The accelerated degradation test platform device has the following functions:

[0127] 1) Voltage sag, random voltage interruption, power fluctuation: The power supply to the test device is controlled by a remote control device. The communication, working status, and daily remote operation reports of the device under test are examined when a power outage occurs by turning the power on and off in the remote control oil circuit switching device.

[0128] 2) Oil circuit blockage: The test device is tested by remotely controlling the opening and closing of the oil distribution device's inlet and return valves when oil circuit blockage occurs. The working status of the test device and the daily remote work report are also examined.

[0129] 3) Automatic standard oil preparation: The working principle of the automatic oil preparation device is as follows: It adopts the quantitative standard gas method. Based on the volume and concentration of the oil in the oil storage tank and the concentration of the standard oil sample to be prepared, the software calculates the amount of standard gas required to prepare the standard oil sample of the required concentration. Then, the corresponding volume of standard gas is introduced. Through pressurization, heating, and system oil and gas circulation, it is quickly dissolved in the transformer blank oil. After full balance, the standard oil sample is finally obtained.

[0130] 4) Oil circuit cleaning: After the standard oil is prepared, the cleaning of the inlet and return oil pipelines is controlled by the remote control oil circuit control device in the background; as well as the switching between the main transformer and the oil sample to be tested.

[0131] 5) Determination of standard oil concentration: After the standard oil is prepared, the concentration of the oil is determined by a high-precision chromatographic calibration device, and the measurement results are uploaded to the remote transmission device.

[0132] 6) Unified settings for devices under test: Start, stop, and cycle commands for devices under test can be sent remotely from the backend.

[0133] The system remotely transmits start, stop, and periodic commands to the device under test (DUT) from the backend, allowing for the examination of the DUT's communication, operating status, daily remote transmission reports, measurement results, and spectrum data.

Claims

1. An accelerated degradation test device for online monitoring of dissolved gases in insulating oil, characterized in that: The test apparatus includes a control system and multiple standard oil preparation units for preparing standard oil samples of different concentrations; the standard oil preparation unit and the connecting valve unit of the oil-filled electrical equipment are connected to the oil inlet of the online monitoring device for dissolved gas in the insulating oil to be tested via the oil circuit control unit and pipeline; the online monitoring device for dissolved gas in the insulating oil is connected to the background remote control device connected to the background software of the control system. The background remote control device includes a switching oil circuit control unit, as well as a voltage regulator, current regulator, capacitive reactance regulator, and inductive reactance regulator located in the power supply circuit. The control system controls the power supply circuit of the oil-filled electrical equipment and the online monitoring equipment for dissolved gas in insulating oil through the background remote control device. On the one hand, it enables the oil-filled electrical equipment to work under test conditions to generate test characteristic gases dissolved in insulating oil. On the other hand, it evaluates the voltage sag monitoring capability, random voltage interruption monitoring capability, or power fluctuation monitoring capability of the online monitoring equipment for dissolved gas in insulating oil through accelerated degradation of the test conditions. The control system controls the opening and closing of the oil inlet valve and oil return valve of the oil-filled electrical equipment through the switching oil circuit control unit in order to evaluate the oil circuit blockage monitoring capability of the online monitoring equipment for dissolved gas in insulating oil. The oil-filled electrical equipment includes an oil-filled transformer or an oil-filled reactor for testing; The test apparatus also includes an accelerated degradation test device connected to an online monitoring device for dissolved gases in insulating oil; the accelerated degradation test device performs accelerated degradation treatment on the online monitoring device for dissolved gases in insulating oil under test. The online monitoring equipment for dissolved gases in insulating oil includes a high-precision chromatography calibration device, an environmental test chamber, a control system, and a power regulation device; The online monitoring equipment for dissolved gases in insulating oil is installed near the large oil-filled transformer used for testing. The oil-filled transformer serves as the test transformer and is equipped with a sampling valve at the bottom. The online monitoring equipment for dissolved gases in insulating oil takes oil samples from the transformer oil inside the test transformer through the sampling valve and monitors the content of characteristic gas components contained in the oil samples online. The power supply circuit of the oil-filled electrical equipment includes a power regulating device, which is electrically connected to the input terminal of the large oil-filled transformer. The power regulating device regulates the test transformer to operate under various abnormal conditions, causing the insulating oil inside the test transformer to undergo pyrolysis or cracking, generating a large amount of characteristic gas required for the test and dissolving it in the transformer oil. The standard oil preparation unit includes a high-concentration standard oil sample preparation tank, a medium-concentration standard oil sample preparation tank, and a low-concentration standard oil sample preparation tank. It is connected to the online monitoring equipment for dissolved gas of the insulating oil under test and is used to prepare standard oil samples of different concentrations for use as insulating oil samples in the test process. Multiple standard oil preparation units are configured in parallel and connected to different online monitoring devices for dissolved gases in insulating oil via connecting valve units; The accelerated degradation test includes the following steps; Step A1: Under the control of the control system, the tested online monitoring equipment for dissolved gas in insulating oil is first subjected to accelerated aging treatment. The accelerated aging treatment method includes using the tested online monitoring equipment for dissolved gas in insulating oil to conduct high-frequency and high-intensity online monitoring tests on the characteristic gas components dissolved in the transformer oil filled inside the large oil-filled test transformer at least once per hour and continuously for at least 10 days, so as to accelerate the degradation of the tested online monitoring equipment for dissolved gas in insulating oil. Step A2: Perform the insulating oil sample testing procedure to evaluate the performance of the online dissolved gas monitoring equipment for insulating oil after accelerated degradation treatment. Specifically, the online dissolved gas monitoring equipment for insulating oil after accelerated degradation treatment is used to test the high-concentration, medium-concentration, and low-concentration standard oil samples provided by the standard oil preparation unit connected to it. The test results are compared with the test results of the high-precision chromatography calibration device. If the results exceed the detection error range of the high-precision chromatography calibration device, the online chromatographic monitoring system or the online spectral monitoring system to be tested is judged to be unqualified; otherwise, it is qualified. This is used as a time compression test to evaluate the monitoring accuracy and precision of the online dissolved gas monitoring equipment for insulating oil. An accelerated degradation test method for an online monitoring device for dissolved gases in insulating oil, comprising performing a time compression test or an event compression test on the online monitoring device for dissolved gases in insulating oil; The time compression test refers to setting the detection cycle of the online monitoring equipment for dissolved gases in insulating oil to the shortest possible value during the test, and running the test continuously for the specified time according to the set detection cycle. The event compression test refers to the process of forcibly subjecting the online monitoring equipment for dissolved gases in insulating oil with saturation concentration overload events, high boiling point component accumulation events, voltage sag events, oil circuit blockage events, oil circuit venting events, random voltage interruption events, power fluctuation events, and environmental noise interference events within a specified time during the test. After performing a time compression test or an event compression test, the accelerated degradation test method further tests the basic indicators of accuracy, repeatability, and minimum detection concentration of the online monitoring equipment for dissolved gases in insulating oil. The test method involves conducting accelerated degradation tests on the online monitoring equipment for dissolved gases in insulating oil under test through various tests and simulated field operating environments. The test results from online monitoring are used to comprehensively determine whether the field operation reliability and measurement accuracy of the online monitoring equipment for dissolved gases in insulating oil meet the network access requirements. The experimental method workflow sequence includes time compression test, event compression test, measurement accuracy test, measurement repeatability test, minimum detection concentration test, resolution or cross-response test, and response time; When time compression tests are combined with environmental accelerated degradation tests, the environmental accelerated degradation tests include: salt spray environment accelerated degradation tests, chemical pollution environment accelerated degradation tests, high altitude environment accelerated degradation tests, and high temperature and high humidity environment accelerated degradation tests. Multiple online monitoring devices for dissolved gas in insulating oil are simultaneously connected to the accelerated degradation test platform to automatically complete time compression and event compression tests, perform failure analysis on the equipment, and determine the equipment reliability. The accelerated degradation test platform includes a switch, a connecting valve unit, a standard oil preparation unit, an oil circuit control unit, and background software. The platform device for accelerated degradation testing includes oil circuit cleaning, specifically: after the standard oil is prepared, the cleaning of the inlet and return oil pipelines is controlled by the remote control oil circuit control device in the background; and the switching between the main transformer and the oil sample to be tested.

2. The accelerated degradation test device for online monitoring equipment of dissolved gas in insulating oil according to claim 1, characterized in that: The standard oil preparation unit is connected to the control system and the online monitoring equipment for dissolved gases in the insulating oil under test. The high-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved high-concentration component characteristic gases, the medium-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved medium-concentration component characteristic gases, and the low-concentration standard oil sample preparation tank of the standard oil preparation unit is a standard oil sample preparation tank containing dissolved low-concentration component characteristic gases. During the test, the oil circuit switching control unit is used to switch the different oil circuit connection states when the oil circuit of the online monitoring equipment for dissolved gases in the insulating oil under test is connected to the test transformer and the standard oil sample preparation tanks for high, medium, and low concentration component characteristic gases. During the accelerated degradation test, the online monitoring equipment for dissolved gases in the insulating oil under test, the large oil-filled transformer used for the test, and the standard oil sample preparation tanks for high, medium, and low concentration components of characteristic gases in the standard oil preparation unit are connected to the background remote control device of the control system background software. The control system controls the power supply circuit of the online monitoring equipment for dissolved gas in insulating oil via a remote control device in order to evaluate the equipment's ability to monitor voltage dips, random voltage interruptions, or power fluctuations.

3. The accelerated degradation test device for online monitoring equipment of dissolved gas in insulating oil according to claim 1, characterized in that: The standard oil preparation unit includes an oil sample preparation unit for preparing low, medium, and high concentration oil samples respectively. The standard oil samples prepared by the unit are input into the dissolved gas online monitoring device of the insulating oil under test during the test, and serve as calibration oil samples used by the dissolved gas online monitoring device during the test. The oil sample preparation unit also includes a standard oil sample storage device, which serves as the source of standard oil samples for the long-term continuous operation of the dissolved gas online monitoring device. The transformer and standard oil sample preparation tank used for testing are configured in parallel and connected to different online monitoring devices for dissolved gas in insulating oil through connecting valve units. The transformer used for testing can serve as a large-capacity standard oil sample storage device during testing, and as a source of standard oil samples for long-term continuous operation of dissolved gas online monitoring equipment; When preparing standard component characteristic gas concentration oil samples, the quantitative standard gas method is adopted. Based on the volume and concentration of oil in the oil storage tank and the concentration parameters of the standard oil sample to be prepared, the software calculates the amount of standard characteristic gas required to prepare the standard oil sample of the required concentration. Then, the corresponding volume of standard characteristic gas is introduced, and through pressurization, heating, and system oil and gas circulation, it is rapidly dissolved in the transformer blank oil. After full equilibrium, the standard oil sample is finally obtained. After the standard oil is prepared, the oil circuit control unit is controlled by the remote transmission command of the background remote control device, which controls the test transformer and the switching and cleaning of the oil inlet and return pipelines of the standard oil sample preparation tanks for high, medium and low concentration component characteristic gases. After the standard oil is prepared, the concentration of the oil is calibrated using a high-precision chromatographic calibration device, and the calibration concentration measurement results are uploaded to the background remote control device for use as reference oil data for verification.

4. The accelerated degradation test device for online monitoring equipment of dissolved gas in insulating oil according to claim 3, characterized in that: When the standard oil sample storage device requires an extra-large capacity standard oil sample storage space, the transformer used for the experiment shall be a full-scale 110kV or higher-level oil-filled power transformer as the standard oil sample storage device.

5. The accelerated degradation test device for online monitoring equipment of dissolved gas in insulating oil according to claim 4, characterized in that: The standard oil preparation unit is used to output pipelines for low, medium, and high concentration oil samples, as well as the pipelines for the test transformer to output ultra-large capacity standard oil samples. They are all connected to the control device, and the remote control device in the background controls the oil circuit switching to automatically switch and uniformly output standard oil samples to each of the tested online monitoring devices for dissolved gas in insulating oil.

6. The accelerated degradation test device for online monitoring equipment of dissolved gas in insulating oil according to claim 1, characterized in that: The event compression test includes a saturation concentration overload event, which is simulated in the test to make the concentration of the index gas or the concentration of the gas extracted from the oil reach 5-10 times the normal concentration, or reach the saturation concentration, so as to overload the chromatographic column / gas sensor of the online monitoring equipment for dissolved gases in the insulating oil under test, and accelerate the aging of the chromatographic column and detector. The event compression test includes a high-boiling-point component accumulation event, which is simulated in the test by adding characteristic gaseous components of high-carbon hydrocarbons C3, C4, C5, acetone or methanol to a standard gas or oil sample; During the experiment, the cumulative events of high-boiling-point components and the accelerated degradation effect of low-carbon hydrocarbon C3, C4, and C5 saturated concentration components on the online monitoring equipment for dissolved gases in insulating oil were as follows: A. These components accumulate in the chromatographic column of the online monitoring equipment for dissolved gases in insulating oil, causing a degradation in separation performance; B. After such components slowly flow out of the chromatographic column of the online monitoring equipment for dissolved gases in insulating oil, they also carbonize and deposit on the sensor's active surface, causing the sensor's response performance to degrade. C. For online monitoring equipment for dissolved gases in insulating oil, such high-boiling-point substances gradually deposit into the optical window, causing additional absorption, changing the energy distribution of the light source, generating cross-interference, and affecting the detection accuracy of online monitoring equipment for transformers. The oil circuit blockage event and oil circuit venting event in the event compression test refer to the simulation test in which the oil inlet and outlet pipelines of the oil-filled electrical equipment are closed or vented, and the online monitoring equipment for dissolved gas in insulating oil is recorded to see if it can correctly identify or alarm, and the sampling process is stopped in time until the fault is eliminated. Alternatively, it can be used to examine the sensitivity of the working status of the online monitoring equipment for dissolved gas in insulating oil under test and the accuracy of the remote daily work report. The voltage dip event in the event compression test is controlled and adjusted by a remote control device in the background during the test. The control range includes the control and use of voltage regulators, current regulators, capacitive reactance regulators, and inductive reactance regulators. The random voltage interruption event in the event compression test is to cut off the power to oil-filled electrical equipment in any operating state, and perform no less than 24 operations within 72 hours. The power fluctuation event in the event compression test is controlled by the background software to control the voltage regulator, current regulator, capacitive reactance regulator, and inductive reactance regulator to make the working voltage of the oil-filled electrical equipment fluctuate within the dynamic threshold range of AC185V~265V, and to adjust the current, capacitive reactance and inductive reactance within the preset range, so as to examine the repeatability and measurement error of the monitoring data of the online monitoring equipment for dissolved gas in insulating oil. The test process examines the communication, working status, and remote transmission of daily work reports of the online monitoring equipment for dissolved gas in insulating oil under test through voltage sag events, random voltage interruption events, and power fluctuation events. The environmental noise interference events in the event compression test refer to the noise or artificial vibration and sound generated by transformers, reactors, and ventilation fans in the substation that are simulated during the test process. The transformer body noise is the noise generated by the periodic vibration of the iron core due to the magnetostriction of the internal silicon steel sheets, as well as the vibration noise generated by the electromagnetic force on the winding coil due to the change of magnetic leakage over time when current passes through. The reactor noise is the noise generated by the reactor iron core due to magnetostriction and the vibration of the winding coil. The ventilation fan noise is the aerodynamic noise caused by the rotation of the fan blades, as well as the mechanical noise generated by the motor or other components of the fan during operation.

7. The accelerated degradation test device for online monitoring equipment of dissolved gas in insulating oil according to claim 1, characterized in that: During the test, the online monitoring equipment for dissolved gas in insulating oil is connected to the test transformer used for storing ultra-large capacity standard oil samples. After a preset duration or number of consecutive extreme runs, it automatically switches to the low, medium, and high concentration oil sample configuration unit to perform quantitative evaluation of the online monitoring equipment for dissolved gas in insulating oil under test in terms of accuracy, response time, minimum detection concentration, separation degree, or cross-response test performance, and then conducts the next round of continuous extreme runs. The background remote control device simultaneously connects to multiple online monitoring devices for dissolved gases in insulating oil, automatically completes time compression and event compression tests, performs failure analysis on the equipment, and determines the equipment reliability; The background remote control device sends remote control commands to multiple online monitoring devices for dissolved gases in insulating oil, issuing start, stop, and periodic commands to evaluate the communication, working status, daily remote work reports, measurement results, and spectra of the online monitoring devices for dissolved gases in insulating oil.

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