Prefabricated cabin type equipment maintenance method of transformer substation based on multi-cabin system

Abstract

The invention discloses a prefabricated cabin type equipment maintenance method for a transformer substation based on a multi-cabin system, and relates to the technical field of transformer substation equipment maintenance, and the method comprises the following steps: analyzing each piece of prefabricated cabin type equipment according to the functions of the cabin type equipment of the transformer substation, and obtaining equipment monitoring data and operation load data; establishing a data analysis model based on machine learning according to the equipment monitoring data and the operation load data, and generating an equipment evaluation coefficient; comparing and analyzing the evaluation coefficient of each prefabricated cabin type equipment with a preset equipment maintenance threshold value, maintaining the prefabricated cabin type equipment according to a comparison and analysis result, and carrying out secondary evaluation on the maintained equipment; the problems that in an existing overhaul method, a preventive maintenance strategy is not accurate enough, and equipment cannot be detected and processed in time before a fault occurs are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of substation equipment maintenance, and more specifically, to a prefabricated cabin type equipment maintenance method for a substation based on a multi-cabin system. Background Art

[0002] Prefabricated cabin equipment has been used in many substations and data centers. The technology has gradually matured. The modular design allows standardized production and testing in the factory. On-site installation only requires quick assembly, which greatly shortens the construction period. Modern prefabricated cabin equipment usually integrates transformers, switchgear, control systems, etc., and is equipped with advanced monitoring and automation technology, which improves the reliability of the equipment and the convenience of operation.

[0003] Deficiencies of existing technologies: Although prefabricated cabin-type equipment can be standardized in the factory and quickly assembled and put into use on site, when large-scale maintenance is required, some equipment may be difficult to completely remove or replace from the cabin, requiring the equipment to be shut down for a long time. Therefore, while the equipment is in working condition, real-time monitoring and troubleshooting face technical challenges, requiring the equipment to be shut down for a long time, and preventive maintenance strategies are not accurate enough, resulting in the failure to detect and deal with problems in time before the equipment fails.

[0004] In view of the above problems, the present invention proposes a solution. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a prefabricated cabin type equipment maintenance method for a substation based on a multi-cabin system, and through the prefabricated cabin type equipment maintenance method for a substation based on a multi-cabin system, the problem that the equipment proposed in the above-mentioned background technology cannot be detected and processed in time before a fault occurs is solved.

[0006] To achieve the above object, the present invention provides the following technical solutions: A method for overhauling prefabricated cabin equipment in a substation based on a multi-cabin system includes the following steps: analyzing each prefabricated cabin equipment according to the cabin equipment function of the substation to obtain equipment monitoring data and operating load data; establishing a data analysis model based on machine learning based on the equipment monitoring data and operating load data to generate an equipment evaluation coefficient; comparing and analyzing the equipment evaluation coefficient of each prefabricated cabin with a preset equipment maintenance threshold, overhauling the prefabricated cabin equipment according to the comparison and analysis results, and conducting a secondary evaluation on the overhauled equipment.

[0007] In a preferred embodiment, the equipment monitoring data includes short-circuit impedance ratio and transformer oil status dielectric loss factor, and the operating load data includes circuit breaker operating load factor.

[0008] In a preferred embodiment, the specific method for obtaining the short-circuit impedance ratio is as follows: obtain the rated voltages of the high-voltage side and the low-voltage side when the device is in a normal state, and record the ratio of the rated voltage on the high-voltage side to the rated voltage on the low-voltage side as the voltage ratio; under safe test conditions, perform a short-circuit test on the device, connect the measuring instrument to the low-voltage side of the transformer, short-circuit the high-voltage side of the transformer, and apply a known voltage on the low-voltage side at the same time, and record the short-circuit current and the applied voltage value; calculate the short-circuit impedance ratio by combining the short-circuit current and the applied voltage value with the voltage ratio.

[0009] In a preferred embodiment, the specific method for obtaining the transformer oil state dielectric loss factor is as follows: when the equipment is running stably, collect an oil sample from the transformer; connect the probe of the tester to the sample container of the transformer oil sample, and apply an alternating voltage to the oil sample; obtain the applied voltage and the current waveform flowing through the oil sample, obtain the phase difference between the applied voltage and the current flowing through the oil sample through the current and voltage waveforms, and use the cosine value of the phase difference as the power factor of the transformer oil; place the oil sample in the test unit of the insulation resistance tester, set the test voltage according to the equipment manual, and the tester displays the capacitance value of the transformer oil; use the ratio of the power factor to the capacitance as the transformer oil state dielectric loss factor.

[0010] In a preferred embodiment, the specific method for obtaining the circuit breaker operation load factor is as follows: obtaining the rated temperature of the circuit breaker and the ambient temperature during actual operation, and taking the difference between the ambient temperature during actual operation and the rated temperature as the temperature change; recording the total number of operations of the circuit breaker within a preset time period; dividing the total number of operations by the preset time period to obtain the operation frequency of the circuit breaker; multiplying the total number of operations by the operation frequency to obtain the operation load, and combining the temperature change and the rated temperature of the circuit breaker to obtain the circuit breaker operation load factor according to the preset circuit breaker operation load factor calculation formula.

[0011] In a preferred embodiment, the equipment evaluation coefficient of each prefabricated cabin type is compared and analyzed with a preset equipment maintenance threshold, and the specific steps of repairing the prefabricated cabin equipment according to the comparison and analysis results are as follows: when the equipment evaluation coefficient is less than the first equipment maintenance threshold, the prefabricated cabin equipment does not need to be repaired, and continuous testing is performed; when the equipment evaluation coefficient is greater than the first equipment maintenance threshold and less than the second equipment maintenance threshold, a low-level alarm is issued, and the prefabricated cabin equipment is repaired in time; when the equipment evaluation coefficient is greater than the second equipment maintenance threshold, a high-level alarm is issued, and the prefabricated cabin equipment needs to be repaired immediately.

[0012] In a preferred embodiment, the specific steps of performing a secondary evaluation on the equipment after maintenance are as follows: for equipment whose equipment evaluation coefficient is greater than the first equipment maintenance threshold, after the prefabricated cabin equipment is repaired, the equipment is secondary evaluated to calculate the equipment evaluation coefficient after maintenance; the equipment evaluation coefficient is compared and analyzed again with the preset equipment maintenance threshold, and the equipment is secondary overhauled according to the analysis results.

[0013] The technical effects and advantages of the prefabricated cabin equipment maintenance method of the substation based on the multi-cabin system of the present invention are as follows: The present invention shortens equipment downtime by quickly replacing and repairing equipment in the substation. This method enables maintenance work to be completed more quickly, thereby reducing the impact on the power system; By using prefabricated cabins, the equipment in the cabin can be quickly replaced when a failure occurs, without the need for a long power outage in the entire substation. This method can greatly reduce the power outage time and ensure the continuity of power supply. The design of the multi-cabin system can effectively separate different equipment and functional areas, reducing the risk of safety accidents during maintenance. Each cabin can be operated and maintained independently, thus avoiding the impact of equipment failure on the entire system. The design of the prefabricated cabin makes the use of substation space more flexible and efficient. It can be adjusted and arranged according to actual needs to make the use of substation space more reasonable. Prefabricated cabins usually adopt standardized design and can realize modular management. This not only improves the standardization level of equipment manufacturing and maintenance, but also facilitates the transportation and installation of equipment.

[0014] The present invention can adapt to different types of equipment and maintenance needs by flexibly adjusting during equipment maintenance. This flexibility enables the substation to adapt to various changes and challenges more quickly. Due to the standardization and modularization of the prefabricated cabin, the maintenance cost of the equipment can be reduced during long-term operation and maintenance. When the equipment fails, only the corresponding cabin needs to be replaced without complicated on-site maintenance. The design of the prefabricated cabin simplifies the equipment maintenance process. Maintenance personnel can inspect, maintain and replace the equipment in the prefabricated cabin without too many complicated operating steps. Through cabin management and maintenance, the transmission effect of equipment failures can be reduced, and the reliability and stability of the overall substation system can be improved. This method helps to ensure the normal operation of the power system and reduce the negative impact of failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a structural schematic diagram of a method for overhauling prefabricated cabin-type equipment of a transformer substation based on a multi-cabin system. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Embodiment 1, Figure 1 The present invention provides a method for overhauling prefabricated cabin-type equipment of a transformer substation based on a multi-cabin system.

[0018] S10, analyzing each prefabricated cabin-type equipment according to the cabin-type equipment function of the substation to obtain equipment monitoring data and operating load data; The equipment monitoring data includes short-circuit impedance ratio and transformer oil status dielectric loss factor, The specific method for obtaining the short-circuit impedance ratio is as follows: First, the rated voltages of the high-voltage side and the low-voltage side are obtained when the device is in a normal state, and the ratio of the rated voltage of the high-voltage side to the rated voltage of the low-voltage side is recorded as the voltage ratio; Under safe test conditions, perform a short-circuit test on the equipment by connecting the measuring instrument to the low-voltage side of the transformer, short-circuiting the high-voltage side of the transformer, and applying a known voltage to the low-voltage side at the same time, recording the short-circuit current and the applied voltage value; The short-circuit impedance ratio is calculated by combining the short-circuit current and the applied voltage value with the voltage ratio; The specific calculation formula of short-circuit impedance ratio is as follows:

[0019] In the formula, is the short-circuit impedance ratio, is the recorded short-circuit current, is the applied voltage value, is the voltage ratio; The specific calculation formula of the voltage ratio is as follows:

[0020] In the formula, is the rated voltage on the high voltage side, is the rated voltage of the low voltage side, is the voltage ratio; It should be noted that in the power system, the selection of short-circuit impedance ratio should be weighed according to specific needs. A smaller short-circuit impedance ratio helps to detect and isolate faults more efficiently and improve the sensitivity of the protection device while ensuring system safety. When servicing prefabricated cabin equipment, obtaining the short-circuit impedance ratio of the transformer has several important benefits: Assessing equipment health: The short-circuit impedance ratio can reflect the internal condition of the transformer, including the health of the windings and core. If the short-circuit impedance ratio deviates significantly from the rated value, it may mean that the equipment has insulation aging, winding damage or other problems. Accurately locate the problem: During maintenance, knowing the short-circuit impedance ratio can help technicians determine if there is an abnormality in the transformer, especially when compared with the short-circuit current of other equipment or systems; Optimize maintenance planning: By monitoring and recording the short-circuit impedance rate changes of the transformer, preventive maintenance and overhaul can be better planned and scheduled to avoid equipment failure and reduce downtime; Improve system protection settings: Obtaining the short-circuit impedance ratio helps adjust the settings of the protection device to ensure that the fault current can be cut off in time in the event of a short circuit, protecting the transformer and other related equipment; Verify the repair effect: After the inspection and maintenance are completed, re-measuring the short-circuit impedance ratio can verify the effect of the repair work and ensure that the equipment has returned to normal operation; Ensure compliance: In some industry standards and specifications, the short-circuit impedance ratio of the transformer is part of the equipment performance test, and ensuring it is within the specified range helps with compliance inspection and certification; The specific method for obtaining the transformer oil state dielectric loss factor is as follows: When the equipment is running stably, collect representative oil samples from the transformer to ensure that the samples are representative and avoid contamination; Connect the probe of the tester to the sample container of the transformer oil sample to ensure good contact. The tester applies an alternating voltage to the oil sample and obtains the waveforms of the applied voltage and the current flowing through the oil sample. The phase difference between the applied voltage and the current flowing through the oil sample is obtained through the current and voltage waveforms. The cosine value of the phase difference is used as the power factor of the transformer oil. Use an insulation resistance tester to measure capacitance. Place the oil sample in the test unit of the tester and set the appropriate test voltage according to the equipment manual. The equipment will display the capacitance value of the transformer oil. The ratio of power factor to capacitance is taken as the transformer oil state dielectric loss factor; The calculation formula is as follows:

[0021] In the formula, is the transformer oil state dielectric loss factor, is the power factor of the transformer oil, is the capacitance value of transformer oil; Among them, the specific calculation formula of the power factor of the transformer oil is as follows;

[0022] In the formula, is the power factor of the transformer oil, is the phase difference between the applied voltage and the current flowing through the oil sample; It should be noted that the dielectric loss factor of transformer oil is an important indicator for evaluating the insulation performance of oil. It reflects the energy loss capacity of the insulating medium. A lower dielectric loss factor indicates better insulation performance of the oil and less energy loss of the insulating medium in the power system, which usually means that the oil is of high quality and in good insulation condition. A higher dielectric loss factor may indicate that the insulating material is deteriorated or contaminated, which may lead to a decrease in insulation performance and an increased risk of equipment failure. The dielectric loss factor of transformer oil has several important benefits when servicing prefabricated cabin equipment: Evaluate insulation performance: Dielectric loss factor can help evaluate the insulation performance of transformer oil and determine whether there are aging or degradation problems; Fault prevention: By monitoring the dielectric loss factor, potential insulation defects can be detected early, thus preventing possible electrical failures; Improve equipment reliability: A good dielectric loss factor indicates good insulation condition, which helps maintain the normal operation and reliability of the equipment; Extend equipment life: Regular inspection and maintenance of insulation performance can extend the service life of transformers and related equipment; The specific method for obtaining the operating load data including the circuit breaker operating load factor is as follows: First, the rated temperature of the circuit breaker and the actual working ambient temperature are obtained, and the difference between the actual working ambient temperature and the rated temperature is taken as the temperature change; Record the total number of circuit breaker operations within a preset time period; The total number of operations is divided by the preset time period to obtain the operating frequency of the circuit breaker; The total number of operations and the operating frequency are multiplied to obtain the operating load. The operating load factor of the circuit breaker is obtained according to the preset circuit breaker operating load factor calculation formula by combining the temperature change and the rated temperature of the circuit breaker.

[0023] The calculation formula is as follows:

[0024] In the formula, is the circuit breaker operating load factor, is the total number of operations, is a preset time period, is the actual working environment temperature, is the rated temperature; When servicing prefabricated pod equipment, circuit breaker operating load factors have several important benefits: Evaluate equipment usage: Help evaluate the load of the circuit breaker in actual use and understand its operating frequency and load level; Maintenance cycle arrangement: provide a basis for reasonably arranging maintenance and overhaul cycles to avoid equipment failures caused by excessive operation; Performance testing: helps detect whether the circuit breaker is working within the expected load range to ensure its performance and safety; Extend equipment life: through reasonable monitoring and maintenance, reduce the impact of excessive load on equipment and extend its service life; It should be noted that the circuit breaker operating load factor should generally be as small as possible; a smaller operating load factor indicates that the circuit breaker is under lighter load during use, which helps to improve its reliability and extend its service life; an excessively high operating load factor may mean that the equipment is often in a state close to or exceeding the rated capacity, which will accelerate wear and increase the risk of failure; S20, establishing a data analysis model based on machine learning according to the equipment monitoring data and the operating load data, and generating an equipment evaluation coefficient; The specific calculation formula of the equipment evaluation coefficient is as follows:

[0025] In the formula, is the equipment evaluation factor, is the short-circuit impedance ratio, is the transformer oil state dielectric loss factor, is the circuit breaker operating load factor; When overhauling prefabricated cabin equipment, the equipment evaluation factor plays several important roles. The following are some key roles: Optimize maintenance plans: Equipment evaluation coefficients can help identify specific problems or potential failure points of equipment, so that maintenance work can be carried out more targeted; based on the evaluation results, it can be determined which components or systems need to be repaired first, thereby optimizing the allocation of maintenance resources; Improve equipment operation reliability: By evaluating the coefficient, the health of the equipment can be monitored, possible signs of degradation can be identified, and maintenance can be performed in advance to avoid sudden failures. Regular evaluation of equipment can reduce the frequency of equipment failures, thereby improving the reliability and stability of overall operation. Extending equipment life: Through comprehensive equipment evaluation, potential problems can be discovered and repaired in a timely manner, thereby reducing equipment wear and extending its service life; evaluation coefficients can help formulate more scientific maintenance plans to avoid over-maintenance or under-maintenance; Reduced operation and maintenance costs: Early assessment and maintenance can reduce emergency repairs and downtime caused by sudden failures, thereby reducing operation and maintenance costs; effective assessment helps avoid unnecessary maintenance work, thereby improving resource utilization efficiency and reducing overall operation and maintenance costs; Ensure safety compliance: The evaluation coefficient helps ensure that the operation of the equipment complies with relevant safety standards and industry specifications, reducing safety hazards. Through systematic evaluation, potential safety hazards can be identified and repaired, thereby protecting the safety of operators and equipment. Improve overall system performance: Equipment evaluation can help identify performance bottlenecks and improvement opportunities, thereby optimizing the overall performance and efficiency of the equipment. During the maintenance process, by analyzing the evaluation coefficients, the integration of the equipment with other parts of the system can be improved, thus improving the overall operation effect. S30, comparing and analyzing the equipment evaluation coefficient of each prefabricated cabin type with a preset equipment maintenance threshold, performing maintenance on the prefabricated cabin type equipment according to the comparative analysis result, and performing a secondary evaluation on the equipment after maintenance; Preset a first equipment maintenance threshold and a second equipment maintenance threshold, and ensure that the first early warning assessment threshold is less than the second early warning assessment threshold; When the equipment evaluation coefficient is less than the first equipment maintenance threshold, the prefabricated cabin equipment does not need to be repaired and continuous testing is performed; When the equipment evaluation coefficient is greater than the first equipment maintenance threshold and less than the second equipment maintenance threshold, a low-level alarm is issued to promptly repair the prefabricated cabin equipment; When the equipment evaluation coefficient is greater than the second equipment maintenance threshold, a high-level alarm is issued, and the prefabricated cabin equipment needs to be repaired immediately; For equipment with an equipment evaluation coefficient greater than the first equipment maintenance threshold, after the prefabricated cabin equipment is repaired, a secondary evaluation is performed on the equipment, the equipment evaluation coefficient after the repair is calculated, the equipment evaluation coefficient is compared and analyzed again with the preset equipment maintenance threshold, and the equipment is subjected to a secondary maintenance according to the analysis results; Comparing and analyzing the evaluation coefficients of each prefabricated cabin equipment with the preset equipment maintenance threshold, and conducting a secondary evaluation of the equipment after maintenance, can help achieve the following effects: 1. Ensure the health of the equipment Preliminary evaluation and comparison: By comparing the equipment evaluation coefficient with the preset maintenance threshold, the current health status of the equipment can be clarified to find out whether there are parts that need maintenance. This comparison can help identify potential problems or existing failures of the equipment. Verification of repair effect: After the equipment is overhauled, a secondary assessment can verify the effectiveness of the repair work and ensure that the equipment is restored to the expected healthy state after repair; 2. Optimize maintenance decisions Prioritization: Through comparative analysis, it is possible to determine which equipment or components need to be repaired first, thereby optimizing the priority and resource allocation of maintenance work; Avoiding excessive maintenance: Comparison with thresholds helps avoid unnecessary maintenance and reduces the possibility of excessive maintenance, thereby reducing maintenance costs and waste of resources; 3. Improve maintenance quality Ensure that repairs are complete: A second assessment of the equipment ensures that all faults that need repair are addressed to avoid missing problems; Check the repair effect: evaluate the repair effect to ensure that the repair work achieves the expected results and the equipment can reach normal operation after repair; 4. Improve equipment reliability Reduce failure rate: Through systematic evaluation and maintenance, the frequency of equipment failures can be reduced and the reliability and stability of equipment can be improved; Maintain equipment performance: ensure that the equipment can recover and maintain optimal performance after maintenance, and optimize the operating efficiency of the equipment; 5. Reduce operation and maintenance costs Reduce emergency repairs: Identifying and fixing problems in advance can reduce emergency repairs caused by equipment failures and reduce overall operation and maintenance costs; Optimize resource use: Through accurate assessment and inspection, maintenance resources can be used more effectively and unnecessary expenditures can be avoided; 6. Improved security Ensure operational safety: Through equipment inspection and secondary evaluation, potential safety hazards can be discovered and repaired, thus improving equipment safety; Compliance with standards and specifications: Ensure that the equipment complies with safety standards and operating specifications after maintenance to protect the safety of operators and equipment; 7. Improve overall system performance Optimize system integration: By overhauling and re-evaluating the equipment, you can improve the integration of the equipment with the rest of the system and improve the overall system performance; Performance recovery: ensure that the equipment can be restored to the best working condition after maintenance, and improve the overall operation effect of the system; By comparing and analyzing the equipment evaluation coefficient with the preset maintenance threshold, the equipment failure can be effectively identified and handled to ensure that the maintenance work is targeted and effective. The secondary evaluation further verifies the effect of the maintenance and ensures that the equipment is restored to its optimal state. This method can not only improve the reliability and performance of the equipment, but also reduce operation and maintenance costs, improve safety, optimize resource utilization, and ultimately improve the overall operation effect of the system; The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0026] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product.

[0027] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0028] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0029] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0030] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated cabin equipment maintenance method for a substation based on a multi-cabin system, characterized in that , including the following steps: Analyze each prefabricated cabin equipment according to the cabin equipment function of the substation to obtain equipment monitoring data and operating load data; According to the equipment monitoring data and operating load data, a data analysis model is established based on machine learning to generate equipment evaluation coefficients; The equipment evaluation coefficient of each prefabricated cabin type is compared and analyzed with the preset equipment maintenance threshold value. The prefabricated cabin equipment is repaired according to the comparative analysis results, and the repaired equipment is re-evaluated.

2. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 1 is characterized in that: The equipment monitoring data includes short-circuit impedance ratio and transformer oil status dielectric loss factor, and the operating load data includes circuit breaker operating load factor.

3. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 2 is characterized in that: The specific method for obtaining the short-circuit impedance ratio is as follows: The rated voltages of the high voltage side and the low voltage side are obtained when the device is in a normal state, and the ratio of the rated voltage of the high voltage side to the rated voltage of the low voltage side is recorded as the voltage ratio; Under safe test conditions, perform a short-circuit test on the equipment by connecting the measuring instrument to the low-voltage side of the transformer, short-circuiting the high-voltage side of the transformer, and applying a known voltage to the low-voltage side at the same time, recording the short-circuit current and the applied voltage value; The short-circuit impedance ratio is calculated by combining the short-circuit current and the applied voltage value with the voltage ratio.

4. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 2 is characterized in that: The specific method for obtaining the transformer oil state dielectric loss factor is as follows: When the equipment is running stably, collect oil samples from the transformer; Connect the tester probe to the sample container of the transformer oil sample and apply an alternating voltage to the oil sample; Obtaining waveforms of the applied voltage and the current flowing through the oil sample, obtaining a phase difference between the applied voltage and the current flowing through the oil sample through the current and voltage waveforms, and using the cosine value of the phase difference as the power factor of the transformer oil; Place the oil sample in the test unit of the insulation resistance tester, set the test voltage according to the equipment manual, and the tester will display the capacitance value of the transformer oil; The ratio of power factor to capacitance is taken as the transformer oil state dielectric loss factor.

5. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 2 is characterized in that: The specific method for obtaining the circuit breaker operation load factor is as follows: The rated temperature of the circuit breaker and the actual working ambient temperature are obtained, and the difference between the actual working ambient temperature and the rated temperature is taken as the temperature change; Record the total number of circuit breaker operations within a preset time period; The total number of operations is divided by the preset time period to obtain the operating frequency of the circuit breaker; The total number of operations and the operating frequency are multiplied to obtain the operating load. The operating load factor of the circuit breaker is obtained according to the preset circuit breaker operating load factor calculation formula by combining the temperature change and the rated temperature of the circuit breaker.

6. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 1 is characterized in that: The specific steps of comparing and analyzing the equipment evaluation coefficient of each prefabricated cabin type with the preset equipment maintenance threshold and performing maintenance on the prefabricated cabin type equipment according to the comparison and analysis results are as follows: When the equipment evaluation coefficient is less than the first equipment maintenance threshold, the prefabricated cabin equipment does not need to be repaired and continuous testing is performed; When the equipment evaluation coefficient is greater than the first equipment maintenance threshold and less than the second equipment maintenance threshold, a low-level alarm is issued to promptly repair the prefabricated cabin equipment; When the equipment evaluation coefficient is greater than the second equipment maintenance threshold, a high-level alarm is issued, requiring immediate maintenance of the prefabricated cabin equipment.

7. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 1 is characterized in that: The specific steps for conducting a secondary assessment of the repaired equipment are as follows: For equipment with an equipment evaluation coefficient greater than the first equipment maintenance threshold, after the prefabricated cabin equipment is repaired, a second evaluation is performed on the equipment to calculate the equipment evaluation coefficient after the repair; The equipment evaluation coefficient is compared and analyzed again with the preset equipment maintenance threshold, and the equipment is overhauled for the second time based on the analysis results.

8. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 1 is characterized in that: The specific calculation formula of the equipment evaluation coefficient is as follows: In the formula, is the equipment evaluation factor, is the short-circuit impedance ratio, is the transformer oil state dielectric loss factor, is the circuit breaker operating load factor.

9. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 2, characterized in that: The specific calculation formula of the short-circuit impedance ratio is as follows: In the formula, is the short-circuit impedance ratio, is the recorded short-circuit current, is the applied voltage value, is the voltage ratio; The specific calculation formula of the voltage ratio is as follows: In the formula, is the rated voltage on the high voltage side, is the rated voltage of the low voltage side, is the voltage ratio.

10. The method for overhauling prefabricated cabin equipment of a substation based on a multi-cabin system according to claim 2, characterized in that: The specific calculation formula of the circuit breaker operation load factor is as follows: In the formula, is the circuit breaker operating load factor, is the total number of operations, is a preset time period, is the actual working ambient temperature, is the rated temperature.

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