Method, device and computer equipment for evaluating the effect of internal fault arc on AC transformer bushing

Abstract

The present application relates to an evaluation method, device and computer equipment for the impact of internal fault arc on AC transformer bushing, including: simulating arc fault according to the test plan through the test platform of internal fault arc and collecting the operating parameters in the test process; obtaining the test voltage curve, test mechanical property curve and test temperature curve according to the operating parameters; obtaining the corrected mechanical property curve and the corrected temperature curve according to the test current, test duration and test voltage curve and the reference mechanical property correlation curve and reference temperature performance correlation curve corresponding to the AC transformer bushing sample; evaluating the impact of internal fault arc on AC transformer bushing according to the corrected mechanical property curve and the test mechanical property curve, as well as the corrected temperature curve and the test temperature curve. The method can realize the comprehensive evaluation of the impact of internal fault arc on bushing and improve the accuracy and reliability of the evaluation results.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a method, device, computer equipment, computer-readable storage medium and computer program product for evaluating the impact of an internal fault arc on an AC transformer bushing. Background Art

[0002] In the power system, AC transformer bushing is an important electrical equipment, and its stability and reliability have a vital impact on the safe operation of the entire power grid. However, with the continuous development of the power system and the increase in power load, AC transformer bushings are facing increasingly severe operating environments and challenges. Internal fault arc is a serious fault that AC transformer bushings may encounter. It not only damages the insulation performance and mechanical strength of the bushing, but may also cause serious accidents such as fire, posing a serious threat to the safe operation of the power grid.

[0003] In order to accurately evaluate the impact of internal fault arc on AC transformer bushing, corresponding experiments and research need to be carried out. Traditional evaluation methods mainly rely on a single parameter index, which makes it difficult to accurately evaluate the impact of internal fault arc on AC transformer bushing. Summary of the invention

[0004] Based on this, it is necessary to provide an evaluation method, device, computer equipment, computer-readable storage medium and computer program product for the impact of internal fault arc on AC transformer bushing in order to address the technical problem that the above-mentioned evaluation method is difficult to accurately evaluate the impact of internal fault arc on AC transformer bushing.

[0005] In a first aspect, the present application provides a method for evaluating the impact of an internal fault arc on an AC transformer bushing. The method comprises:

[0006] Constructing an internal fault arc test platform; the test platform includes a test circuit for simulating an internal fault arc and an insulating bracket for mounting an AC transformer bushing sample to be tested;

[0007] The test platform simulates an arc fault according to a test plan, and collects operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes a test current and a test duration;

[0008] According to the operating parameters, a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc are obtained;

[0009] According to the test current, the test duration and the test voltage curve, and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample, a modified mechanical property curve is obtained; according to the test current, the test duration and the test voltage curve, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample, a modified temperature curve is obtained;

[0010] The influence of the internal fault arc on the bushing of the AC transformer is evaluated based on the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve.

[0011] In one embodiment, the reference mechanical property correlation curve and the reference temperature property correlation curve corresponding to the AC transformer bushing sample are determined by:

[0012] Obtaining attribute parameters of the AC transformer bushing sample;

[0013] According to the property parameters, a reference voltage curve, a reference mechanical property curve and a reference temperature curve are obtained;

[0014] The reference mechanical performance correlation curve is obtained according to the reference voltage curve, the reference mechanical performance curve, and the preset reference test current and reference test duration; and the reference temperature performance correlation curve is obtained according to the reference voltage curve, the reference temperature curve, and the preset reference test current and reference test duration.

[0015] In one embodiment, the modified mechanical property curve is obtained according to the test current, the test duration and the test voltage curve, and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample, including:

[0016] Substituting the test current, the test duration and the test voltage curve into the reference mechanical property correlation curve corresponding to the AC transformer bushing sample to obtain the modified mechanical property curve; the reference mechanical property correlation curve is used to characterize the relationship between current, duration, voltage and mechanical properties;

[0017] The method of obtaining a corrected temperature curve according to the test current, the test duration, the test voltage curve, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample includes:

[0018] Substitute the test current, the test duration and the test voltage curve into the reference temperature performance correlation curve corresponding to the AC transformer bushing sample to obtain the corrected temperature curve; the reference temperature performance correlation curve is used to characterize the relationship between current, duration, voltage and temperature performance.

[0019] In one embodiment, the evaluating the influence of the internal fault arc on the AC transformer bushing according to the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve, comprises:

[0020] Comparing the modified mechanical property curve with the test mechanical property curve to determine the influence of the internal fault arc on the mechanical property of the AC transformer bushing;

[0021] Comparing the modified temperature curve with the test temperature curve to determine the effect of the internal fault arc on the temperature performance of the AC transformer bushing;

[0022] And, a correlation analysis is performed on the test mechanical property curve and the test temperature curve to determine the relationship between the influence of the internal fault arc on the mechanical property of the AC transformer bushing and the temperature of the bushing.

[0023] In one of the embodiments, the operating parameters also include the insulation resistance and dielectric loss tangent value of the AC transformer bushing sample;

[0024] The method further comprises:

[0025] According to the variation curve of the insulation resistance and the variation curve of the dielectric loss tangent value, the influence of the internal fault arc on the insulation performance of the AC transformer bushing is evaluated.

[0026] In one embodiment, obtaining a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc according to the operating parameters includes:

[0027] Preprocessing the operating parameters to obtain preprocessed operating parameters;

[0028] According to the pre-processed operating parameters, a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc are obtained.

[0029] In a second aspect, the present application also provides a device for evaluating the impact of an internal fault arc on an AC transformer bushing. The device comprises:

[0030] A construction module is used to construct a test platform for internal fault arc; the test platform includes a test circuit for simulating internal fault arc and an insulating bracket for mounting a bushing sample of an AC transformer to be tested;

[0031] A test module, used to simulate an arc fault according to a test plan through the test platform, and collect operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes a test current and a test duration;

[0032] A processing module, used for obtaining a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc according to the operating parameters;

[0033] A correction module, for obtaining a corrected mechanical property curve according to the test current, the test duration and the test voltage curve, and a reference mechanical property correlation curve corresponding to the AC transformer bushing sample; and obtaining a corrected temperature curve according to the test current, the test duration and the test voltage curve, and a reference temperature performance correlation curve corresponding to the AC transformer bushing sample;

[0034] An evaluation module is used to evaluate the influence of the internal fault arc on the AC transformer bushing according to the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve.

[0035] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0036] Constructing an internal fault arc test platform; the test platform includes a test circuit for simulating an internal fault arc and an insulating bracket for mounting an AC transformer bushing sample to be tested;

[0037] The test platform simulates an arc fault according to a test plan, and collects operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes a test current and a test duration;

[0038] According to the operating parameters, a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc are obtained;

[0039] According to the test current, the test duration and the test voltage curve, and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample, a modified mechanical property curve is obtained; according to the test current, the test duration and the test voltage curve, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample, a modified temperature curve is obtained;

[0040] The influence of the internal fault arc on the bushing of the AC transformer is evaluated based on the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve.

[0041] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0042] Constructing an internal fault arc test platform; the test platform includes a test circuit for simulating an internal fault arc and an insulating bracket for mounting an AC transformer bushing sample to be tested;

[0043] The test platform simulates an arc fault according to a test plan, and collects operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes a test current and a test duration;

[0044] According to the operating parameters, a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc are obtained;

[0045] According to the test current, the test duration and the test voltage curve, and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample, a modified mechanical property curve is obtained; according to the test current, the test duration and the test voltage curve, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample, a modified temperature curve is obtained;

[0046] The influence of the internal fault arc on the bushing of the AC transformer is evaluated based on the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve.

[0047] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0048] Constructing an internal fault arc test platform; the test platform includes a test circuit for simulating an internal fault arc and an insulating bracket for mounting an AC transformer bushing sample to be tested;

[0049] The test platform simulates an arc fault according to a test plan, and collects operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes a test current and a test duration;

[0050] According to the operating parameters, a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc are obtained;

[0051] According to the test current, the test duration and the test voltage curve, and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample, a modified mechanical property curve is obtained; according to the test current, the test duration and the test voltage curve, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample, a modified temperature curve is obtained;

[0052] The influence of the internal fault arc on the bushing of the AC transformer is evaluated based on the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve.

[0053] The above-mentioned evaluation method, device, computer equipment, storage medium and computer program product for the impact of internal fault arc on AC transformer bushing, after constructing a test platform for internal fault arc, perform arc fault simulation according to the test plan through the test platform, and collect operating parameters during the test process; according to the operating parameters, obtain the test voltage curve, test mechanical property curve and test temperature curve of the internal fault arc; according to the test current, test duration and test voltage curve, and the benchmark mechanical property correlation curve corresponding to the AC transformer bushing sample, obtain a corrected mechanical property curve; according to the test current, test duration and test voltage curve, and the benchmark temperature performance correlation curve corresponding to the AC transformer bushing sample, obtain a corrected temperature curve; according to the test current, test duration and test voltage curve, and the benchmark temperature performance correlation curve corresponding to the AC transformer bushing sample, evaluate the impact of the internal fault arc on the AC transformer bushing. This method can achieve a comprehensive evaluation of the impact of internal fault arc on the bushing by comprehensively considering the changes in multiple key parameters such as arc voltage, bushing pressure and bushing temperature, and can improve the accuracy and reliability of the evaluation results, solving the problem that traditional evaluation methods often only focus on the changes in a single parameter and cannot fully and accurately reflect the actual impact of the internal fault arc on the bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a flow chart of a method for evaluating the impact of an internal fault arc on an AC transformer bushing in one embodiment;

[0055] Figure 2 A schematic flow chart of the steps of determining a baseline mechanical property correlation curve and a baseline temperature property correlation curve in one embodiment;

[0056] Figure 3 is a flow chart of a method for evaluating the impact of an internal fault arc on an AC transformer bushing in another embodiment;

[0057] Figure 4 is a structural block diagram of a device for evaluating the impact of an internal fault arc on an AC transformer bushing in one embodiment;

[0058] Figure 5 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] In one embodiment, Figure 1 As shown, a method for evaluating the impact of an internal fault arc on an AC transformer bushing is provided, the method comprising the following steps:

[0061] Step S110, constructing an internal fault arc test platform; the test platform includes a test circuit for simulating an internal fault arc and an insulating bracket for mounting an AC transformer bushing sample to be tested.

[0062] In the specific implementation, before the test, an internal fault arc test platform is first constructed, which includes a test circuit for simulating internal fault arc and an insulating bracket for installing the AC transformer bushing sample to be tested, and records the structural dimensions, arc striking structure, arc striking wire size, material properties and other attribute parameters of the AC transformer bushing sample. In addition, the test platform should also meet the requirements for internal arc level switchgear and control equipment in relevant industry standards.

[0063] High-precision sensors are installed inside the AC transformer bushing sample. These sensors include but are not limited to current sensors, voltage sensors, pressure sensors and temperature sensors, so as to monitor and record parameters such as fault current I, arc voltage U, AC transformer bushing pressure P and bushing temperature T in real time during the test. In addition, each sensor should have sufficient accuracy and resolution to ensure the accuracy of subsequent evaluation results. Specifically, the accuracy of the current sensor should be at least ±1%, the accuracy of the voltage sensor should be at least ±0.5%, and the accuracy of the pressure sensor and temperature sensor should meet relevant industry standards.

[0064] In this step, by building a more stable and controllable test platform and simulating the real internal fault arc scenario as much as possible, it helps to reduce the impact of test conditions on the evaluation results, improve the accuracy and repeatability of the evaluation results, and solve the problem that the existing test platform may not be able to fully simulate the real internal fault arc scenario, resulting in deviations between the test results and the actual situation.

[0065] Step S120, performing arc fault simulation according to the test plan through the test platform, and collecting operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes test current and test duration.

[0066] The test plan should include parameters such as test current I, test duration s, and test conditions to simulate different internal fault arc scenarios. The test current should at least include the rated short-time withstand current, and the test duration should cover key time points such as 1s and 0.5s.

[0067] In a specific implementation, after the test starts, the operating parameters can be collected through various sensors installed inside the AC transformer bushing sample. For example, the fault current is collected through the current sensor, the arc voltage is collected through the voltage sensor, the bushing pressure is collected through the pressure sensor, and the bushing temperature is collected through the temperature sensor, thereby obtaining the fault current at multiple time points, the arc voltage at multiple time points, the pressure of the bushing sample at multiple time points, and the temperature of the bushing sample at multiple time points, and the collected data are combined into the operating parameters.

[0068] Step S130, obtaining a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc according to the operating parameters.

[0069] Among them, the test voltage curve represents the curve of arc voltage changing with time, the test mechanical property curve represents the curve of voltage mechanical property changing with time, and the test temperature curve represents the curve of casing temperature changing with time.

[0070] In a specific implementation, the test voltage curve, test mechanical property curve and test temperature curve of the internal fault arc can be generated according to the arc voltage, casing pressure and casing temperature collected during the test. Specifically, the test voltage curve can be generated according to the arc voltage at multiple time points in the operating parameters, the test mechanical property curve can be generated according to the casing pressure at multiple time points in the operating parameters, and the test temperature curve can be generated according to the casing temperature at multiple time points in the operating parameters.

[0071] Step S140, obtaining a corrected mechanical property curve according to the test current, test duration and test voltage curves, and the benchmark mechanical property correlation curve corresponding to the AC transformer bushing sample; obtaining a corrected temperature curve according to the test current, test duration and test voltage curves, and the benchmark temperature performance correlation curve corresponding to the AC transformer bushing sample.

[0072] The reference mechanical performance correlation curve is used to characterize the relationship between current, duration, voltage and mechanical performance. The reference temperature performance correlation curve is used to characterize the relationship between current, duration, voltage and temperature performance.

[0073] In a specific implementation, the test current, test duration and test voltage curves can be substituted into the reference mechanical property correlation curve corresponding to the AC transformer bushing sample to obtain a revised mechanical property curve. Also, the test current, test duration and test voltage curves can be substituted into the reference temperature performance correlation curve corresponding to the AC transformer bushing sample to obtain a revised temperature curve.

[0074] Step S150, evaluating the influence of the internal fault arc on the AC transformer bushing according to the corrected mechanical property curve and the test mechanical property curve, and the corrected temperature curve and the test temperature curve.

[0075] In a specific implementation, the influence of the internal fault arc on the mechanical properties of the AC transformer bushing can be evaluated by comparing the corrected mechanical property curve with the test mechanical property curve and observing the difference between them. Similarly, the influence of the internal fault arc on the temperature performance of the AC transformer bushing can be evaluated by comparing the difference between the corrected temperature curve and the test temperature curve.

[0076] Furthermore, the influence of the internal fault arc on the mechanical properties of the AC transformer bushing can be directly evaluated according to the change curve of the bushing pressure; and the influence of the internal fault arc on the temperature performance of the AC transformer bushing can be evaluated according to the change curve of the bushing temperature.

[0077] Furthermore, after obtaining the evaluation results, the evaluation results can be presented in a visual form, such as a curve chart, a bar chart, etc., so as to intuitively understand the changing trends and mutual influences of various parameters. A detailed evaluation report can also be generated, including the test process, test data, analysis process, evaluation results, problems encountered during the evaluation process, solutions, and limitations of the evaluation, etc., for subsequent reference and decision-making.

[0078] In the above-mentioned evaluation method of the impact of internal fault arc on AC transformer bushing, after constructing the test platform of internal fault arc, the arc fault simulation is carried out according to the test plan through the test platform, and the operating parameters in the test process are collected; according to the operating parameters, the test voltage curve, test mechanical property curve and test temperature curve of the internal fault arc are obtained; according to the test current, test duration and test voltage curve, and the benchmark mechanical property correlation curve corresponding to the AC transformer bushing sample, the corrected mechanical property curve is obtained; according to the test current, test duration and test voltage curve, and the benchmark temperature performance correlation curve corresponding to the AC transformer bushing sample, the corrected temperature curve is obtained; according to the corrected mechanical property curve and the test mechanical property curve, and the corrected temperature curve and the test temperature curve, the impact of the internal fault arc on the AC transformer bushing is evaluated. By comprehensively considering the changes of multiple key parameters such as arc voltage, bushing pressure and bushing temperature, this method can realize a comprehensive evaluation of the impact of the internal fault arc on the bushing, and can improve the accuracy and reliability of the evaluation results, solving the problem that the traditional evaluation method often only focuses on the change of a single parameter and is difficult to fully and accurately reflect the actual impact of the internal fault arc on the bushing.

[0079] In an exemplary embodiment, if Figure 2 As shown in FIG. 1 , the reference mechanical property correlation curve and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample are determined by the following steps:

[0080] Step S210, obtaining attribute parameters of the AC transformer bushing sample;

[0081] Step S220, obtaining a reference voltage curve, a reference mechanical property curve and a reference temperature curve according to the property parameters;

[0082] Step S230, obtaining a reference mechanical performance correlation curve based on a reference voltage curve, a reference mechanical performance curve, and a preset reference test current and reference test duration; and obtaining a reference temperature performance correlation curve based on a reference voltage curve, a reference temperature curve, and a preset reference test current and reference test duration.

[0083] Among them, the attribute parameters may include the structural dimensions, arc striking structure, arc striking wire size, material properties, etc. of the AC transformer bushing sample.

[0084] In the specific implementation, different AC transformer bushings have different corresponding benchmark mechanical performance correlation curves and benchmark temperature performance correlation curves. Therefore, after building the test platform to determine the AC transformer bushing sample, the structural dimensions, arc-starting structure, arc-starting wire size, material properties and other attribute parameters of the AC transformer bushing sample can be obtained, and the historical database can be queried according to the attribute parameters. Based on the voltage data, mechanical performance data and temperature data matching the attribute parameters in the historical database, the benchmark voltage curve U, the benchmark mechanical performance curve J and the benchmark temperature curve T are generated.

[0085] Further, the reference voltage curve U, the reference mechanical performance curve J, the preset reference test current I and the reference test duration s are comprehensively processed to obtain the reference mechanical performance correlation curve IsUJ. And the reference voltage curve U, the reference temperature curve T, the preset reference test current I and the reference test duration s are comprehensively processed to obtain the reference temperature performance correlation curve IsUT.

[0086] In this embodiment, a benchmark mechanical property correlation curve and a benchmark temperature performance correlation curve are constructed by using the property parameters of the AC transformer bushing sample, which provides a reference standard for subsequent evaluation of the impact of the internal fault arc on the AC transformer bushing.

[0087] In an exemplary embodiment, the above step S140 obtains a modified mechanical property curve according to the test current, test duration and test voltage curves, and a benchmark mechanical property correlation curve corresponding to the AC transformer bushing sample, including: substituting the test current, test duration and test voltage curves into the benchmark mechanical property correlation curve corresponding to the AC transformer bushing sample to obtain a modified mechanical property curve; the benchmark mechanical property correlation curve is used to characterize the relationship between current, duration, voltage and mechanical properties.

[0088] According to the test current, test duration and test voltage curves, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample, a corrected temperature curve is obtained, including: substituting the test current, test duration and test voltage curves into the reference temperature performance correlation curve corresponding to the AC transformer bushing sample to obtain the corrected temperature curve; the reference temperature performance correlation curve is used to characterize the relationship between current, duration, voltage and temperature performance.

[0089] In a specific implementation, the reference mechanical property correlation curve corresponding to the AC transformer bushing sample can be regarded as a standard mechanical property model, and the test current, test duration and test voltage curves can be regarded as measured variable values. By inputting the measured variable values ​​into the standard mechanical property model, the modified mechanical property curve is calculated, that is, the ideal mechanical property curve under the aforementioned test scheme. Similarly, the reference temperature performance correlation curve can be regarded as a standard temperature performance model. By inputting the measured variable values ​​into the standard temperature performance model, the modified temperature performance curve is calculated, that is, the ideal temperature curve under the aforementioned test scheme.

[0090] In this embodiment, by substituting the test current, test duration and test voltage curves into the benchmark mechanical property correlation curve corresponding to the AC transformer bushing sample, a corrected mechanical property curve is obtained, and by substituting the test current, test duration and test voltage curves into the benchmark temperature performance correlation curve corresponding to the AC transformer bushing sample, a corrected temperature curve is obtained, thereby obtaining the mechanical property curve and temperature curve of the AC transformer bushing under ideal conditions in the current test scheme, and since the internal fault arc simulation affects these two curves, the two ideal curves are obtained through correction to facilitate comparison with the actual curves, thereby determining the influence of the internal fault arc on the mechanical properties and temperature properties of the AC transformer bushing.

[0091] In an exemplary embodiment, in the above step S150, the influence of the internal fault arc on the AC transformer bushing is evaluated according to the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve, including:

[0092] Step S151, comparing the corrected mechanical property curve with the test mechanical property curve to determine the influence of the internal fault arc on the mechanical property of the AC transformer bushing;

[0093] Step S152, comparing the corrected temperature curve with the test temperature curve to determine the impact of the internal fault arc on the temperature performance of the AC transformer bushing;

[0094] Step S153, performing correlation analysis on the test mechanical property curve and the test temperature curve to determine the relationship between the influence of the internal fault arc on the mechanical property of the AC transformer bushing and the temperature of the bushing.

[0095] The modified mechanical property curve represents the modified mechanical property data under the test conditions, which can also be understood as the ideal mechanical property curve. Similarly, the modified temperature curve represents the modified temperature data under the test conditions, which can also be understood as the ideal temperature curve.

[0096] In a specific implementation, the influence of the internal fault arc on the mechanical and temperature properties of the AC transformer bushing can be quantitatively evaluated through statistical analysis. For example, the root mean square error between the corrected mechanical property curve and the test mechanical property curve can be calculated to quantify the difference between the two. If the difference is less than the mechanical property threshold, it indicates that the internal fault arc has a small influence on the mechanical properties of the AC transformer bushing. Otherwise, the influence is greater. Similarly, the root mean square error between the corrected temperature curve and the test temperature curve can be calculated to quantify the difference between the two. If the difference is less than the temperature threshold, it indicates that the internal fault arc has a small influence on the temperature performance of the AC transformer bushing. Otherwise, the influence is greater.

[0097] In addition, correlation analysis can be performed on the test mechanical property curve and the test temperature curve, such as calculating the correlation coefficient between the test mechanical property curve and the test temperature curve, to determine whether the temperature change has a significant impact on the mechanical properties of the bushing. If a significant decrease in mechanical properties corresponds to a temperature increase, it may indicate that the material has been damaged by the continued high temperature caused by the arc fault, which can optimize the design of the AC transformer bushing. For example, heat dissipation measures can be strengthened in subsequent design and maintenance to improve the thermal stability of the bushing.

[0098] In this embodiment, through the systematic analysis process, not only can the impact of the internal fault arc on the AC transformer bushing be quantified, but the relationship between mechanical properties and temperature can also be established in combination with temperature changes, thereby achieving a comprehensive and accurate evaluation of the impact of the internal fault arc on the AC transformer bushing, which helps to further improve the safety and reliability of power equipment and ensure the stable operation of the power grid.

[0099] In an exemplary embodiment, the operating parameters collected during the test also include the insulation resistance and dielectric loss tangent of the AC transformer bushing sample;

[0100] The method further comprises: evaluating the influence of the internal fault arc on the insulation performance of the AC transformer bushing according to the variation curve of the insulation resistance and the variation curve of the dielectric loss angle tangent value.

[0101] The dielectric loss tangent refers to the tangent of the ratio between the energy loss caused by the dielectric in the AC circuit and the stored energy.

[0102] In a specific implementation, during the test, the insulation resistance and dielectric loss tangent value of the AC transformer bushing are measured at regular intervals, and the collected insulation resistance and dielectric loss tangent value data are plotted as a time variation curve for visual analysis.

[0103] By comparing the changes in parameters such as the insulation resistance and dielectric loss tangent of the bushing before and after the test, the impact of the internal fault arc on the insulation performance of the bushing is evaluated. In this test, it was found that the insulation resistance of the bushing decreased, but it still met the requirements of relevant standards. By analyzing the insulation resistance change curve, the trend of insulation resistance over time is identified, and the insulation resistance values ​​in different time periods are compared. If the resistance is significantly reduced, further investigation of possible causes is required. Analyze the change curve of the dielectric loss tangent value. Dielectric loss is the energy loss caused by polarization of the material under the electric field. Generally, a smaller dielectric loss angle value indicates better insulation performance, and an increased dielectric loss tangent value indicates that the quality of the insulating material is reduced. And the changes in insulation resistance and dielectric loss tangent value are comprehensively discussed to analyze the correlation between the two. For example, in the same time period, if the insulation resistance decreases and the dielectric loss tangent value increases, this may indicate that the insulating material has been damaged by the internal fault arc.

[0104] Based on the data of insulation resistance and dielectric loss, statistical methods or machine learning techniques can be used to establish an evaluation model to more systematically analyze the impact of faults on insulation performance. Based on the analysis results, the degree of impact of the internal fault arc on the insulation performance of the AC transformer bushing can be determined to determine whether it is within an acceptable range. Based on the evaluation results, the bushing can be designed, optimized and maintained.

[0105] In this embodiment, on the basis of evaluating the influence of internal fault arc on the mechanical properties and temperature properties of the AC transformer bushing, the insulation resistance and dielectric loss tangent of the AC transformer bushing sample are further introduced to evaluate the influence of internal fault arc on the insulation performance of the AC transformer bushing. By comprehensively analyzing the changing trends and mutual influence of multiple parameters, a more comprehensive and objective evaluation result of the AC transformer bushing is obtained, thereby solving the limitation of traditional evaluation methods.

[0106] In an exemplary embodiment, the above-mentioned step S130 obtains the test voltage curve, test mechanical property curve and test temperature curve of the internal fault arc according to the operating parameters, including: preprocessing the operating parameters to obtain preprocessed operating parameters; obtaining the test voltage curve, test mechanical property curve and test temperature curve of the internal fault arc according to the preprocessed operating parameters.

[0107] In a specific implementation, considering that possible instability in the test process may affect the quality of the collected operating parameters, after collecting the operating parameters in the test process, they are further preprocessed to improve the accuracy of subsequent evaluation.

[0108] Specifically, the preprocessing of the operating parameters may include at least one of the following methods: deduplication, noise removal, missing value processing, and abnormal value processing. More specifically, deduplication processing means checking the collected operating parameters, identifying and deleting duplicate records, and ensuring that there is only one record at each time point, for example, there is only one arc voltage, one casing pressure, and one casing temperature at each time point. Noise removal processing can remove noise in the operating parameters through a filter. Processing missing values ​​specifically involves filling missing values, for example, by interpolation. Processing abnormal values ​​specifically involves eliminating abnormal values, and abnormal values ​​in the operating parameters can be identified by statistical methods and eliminated.

[0109] In this embodiment, the collected operating parameters are deeply analyzed and processed to remove noise and interference to improve data quality, accuracy and availability, thereby improving the accuracy and reliability of subsequent evaluation results of the impact of internal fault arcs on the AC transformer bushing based on operating parameters.

[0110] In an exemplary embodiment, if Figure 3 FIG. 1 is a schematic diagram of a specific process of evaluating the impact of an internal fault arc on an AC transformer bushing, comprising the following steps:

[0111] Step S310, constructing an internal fault arc test platform; the test platform includes a test circuit for simulating an internal fault arc and an insulating bracket for mounting an AC transformer bushing sample to be tested;

[0112] Step S320, performing arc fault simulation according to the test plan through the test platform, and collecting operating parameters during the test; the operating parameters include arc voltage, bushing pressure, bushing temperature, insulation resistance and dielectric loss tangent value, and the test plan includes test current and test duration;

[0113] Step S330, obtaining a reference mechanical property correlation curve and a reference temperature performance correlation curve corresponding to the AC transformer bushing sample according to the attribute parameters of the AC transformer bushing sample; and preprocessing the operating parameters, and obtaining a test voltage curve, a test mechanical property curve, and a test temperature curve of the internal fault arc according to the preprocessed operating parameters;

[0114] Step S340, substituting the test current, test duration and test voltage curve into the reference mechanical property correlation curve to obtain a modified mechanical property curve; substituting the test current, test duration and test voltage curve into the reference temperature performance correlation curve to obtain a modified temperature curve;

[0115] Step S350, evaluating the influence of the internal fault arc on the mechanical properties of the AC transformer bushing according to the corrected mechanical property curve and the test mechanical property curve;

[0116] Step S360, evaluating the influence of the internal fault arc on the temperature performance of the AC transformer bushing according to the corrected temperature curve and the test temperature curve;

[0117] Step S370: evaluating the influence of the internal fault arc on the insulation performance of the AC transformer bushing according to the variation curve of the insulation resistance and the variation curve of the dielectric loss tangent.

[0118] The method proposed in this application is used to comprehensively evaluate the explosion-proof performance of AC transformer bushings under the action of internal fault arcs, and has the following beneficial effects:

[0119] (1) This method builds an internal fault arc test platform and uses high-precision sensors to monitor and record multiple key parameters such as fault current, arc voltage, AC transformer bushing pressure, and bushing temperature in real time during the test. This method can fully reflect the impact of internal fault arc on the AC transformer bushing. Compared with the traditional method that only relies on a single parameter for evaluation, this method can more accurately reflect the actual performance and fault status of the bushing.

[0120] (2) The use of high-precision sensors and data processing technology to pre-process and analyze the collected operating data can obtain accurate and reliable test data, thereby ensuring the accuracy and reliability of the evaluation results and providing strong support for the maintenance and improvement of power equipment.

[0121] (3) By evaluating the impact of internal fault arc on the bushing of AC transformer, including key performance parameters such as insulation performance, mechanical strength, and service life of the bushing, the impact of internal fault arc on the bushing of AC transformer can be comprehensively and accurately evaluated, providing a scientific basis for the maintenance and improvement of power equipment. In addition, this application also specifies the standards that the test platform should meet, the accuracy requirements of the sensor, and the basis for the development of the evaluation algorithm or model to ensure the reliability and effectiveness of the evaluation results.

[0122] (4) The evaluation results are presented in a visual form, such as curve graphs and bar charts, so that users can intuitively understand the changing trends and mutual influences of various parameters, which helps users better understand the evaluation results and make scientific decisions accordingly.

[0123] (5) This method can be adjusted and optimized according to different test requirements and is suitable for different types of AC transformer bushings and different fault scenarios, making the method highly flexible and applicable. And by evaluating the impact of internal fault arcs on AC transformer bushings, this method can detect potential safety hazards and fault trends in advance, so as to take corresponding preventive measures to avoid accidents and improve the safe operation level of the power grid.

[0124] In one embodiment, in order to facilitate those skilled in the art to understand the embodiments of the present application, the present solution will be described below using a 126kV AC transformer bushing as an example.

[0125] Test preparation: Test platform construction. According to the IEC62271-2003 standard, a test platform for simulating internal fault arc was built. The platform has the ability to simulate internal fault arc under different conditions and is equipped with an insulating bracket for installing the 126kV AC transformer bushing. Record the arc striking point position, bushing shell diameter and thickness of the 126kV AC transformer bushing sample, the distance between the arc striking point and the pressure relief device and the pressure relief path, and the arc striking structure uses a Ø12 copper rod connected to the middle flange at one end and the high-voltage conductor at the other end. The arc striking wire is Ø3, 20mm long, and the shell is an epoxy glass wire winding cylinder. Sensor installation and calibration. High-precision current sensors, voltage sensors, pressure sensors and temperature sensors are installed in the 126kV AC transformer bushing. The accuracy of the current sensor reaches ±1%, the accuracy of the voltage sensor reaches ±0.5%, and the pressure sensor and temperature sensor also have high measurement accuracy. All sensors are strictly calibrated before the test to ensure the accuracy of the measurement data.

[0126] Test process, test condition setting. According to the test requirements, the test current is set to a specific value of the rated short-time withstand current (such as 10kA), and the test duration is 0.1 seconds. By adjusting the relevant parameters of the test platform, a severe internal fault arc scenario is simulated.

[0127] Data acquisition. After starting the test, the test platform will automatically record the data of key parameters such as fault current, arc voltage, casing pressure and test temperature. The data acquisition system ensures stable operation during the test and captures the changes of all parameters in real time. Data preprocessing. After the test, the collected data is filtered, denoised and other preprocessing operations are performed. Through these preprocessing steps, the data quality can be improved and the impact of noise on the evaluation results can be reduced.

[0128] Data analysis and evaluation: The structural dimensions, arc striking structure, arc striking wire size, material properties and other parameters of the AC transformer bushing samples were used to obtain the internal fault arc voltage curve of 400V (mean), mechanical property curve of 1.8MPa (mean), temperature curve of 630℃ (mean), etc. The preset test current was 10kA (mean) and the test duration was 0.1s to obtain the benchmark mechanical property correlation curve I 1 -s 1 -U 1 -J 1 , that is, 10kA (mean)-0.1s-400V (mean)-1.8MPa (mean) and benchmark temperature performance correlation curve I 1 -s 1-U 1 -T 1 , that is, 10kA (average)-0.1s-400V (average)-630℃ (average).

[0129] The internal fault arc voltage curve of 378V (mean), mechanical property curve of 1.7MPa (mean), temperature curve of 700℃ (mean), etc. were obtained by using the fault current, arc voltage, AC transformer bushing pressure and test sample temperature during the test. The comprehensive test current was 12kA (mean) and the test duration was 0.1s to obtain the test mechanical property correlation curve I 2 -s 2 -U 2 -J 2 , that is, 12kA (mean) -0.1s-378V (mean) -1.7MPa (mean) and test temperature performance correlation curve I 2 -s 2 -U 2 -T 2 , that is, 12kA (average)-0.1s-378V (average)-700℃ (average).

[0130] Substitute 12kA (average), 0.1s, 378V (average) into the benchmark mechanical performance correlation curve I 1 -s 1 -U 1 -J 1 Correlation curve I with the benchmark temperature performance 1 -s 1 -U 1 -T 1 , the corrected mechanical properties of 1.75MPa and the corrected temperature of 660℃ were obtained, 1.75MPa and 1.7MPa, 660℃ and 700℃ were analyzed, the gap between the test value and the benchmark value (i.e., the design value) was analyzed, and the impact of the internal fault arc on the AC transformer bushing was evaluated.

[0131] The multi-parameter comprehensive analysis of this method is developed based on historical data and professional knowledge. It can comprehensively consider the changes in multiple parameters such as fault current, arc voltage, bushing pressure and test sample temperature, and comprehensively evaluate the impact of internal fault arc on the bushing of AC transformer. Insulation performance evaluation, by comparing the changes in parameters such as insulation resistance and dielectric loss tangent of the bushing before and after the test, the impact of internal fault arc on the insulation performance of the bushing is evaluated. In this test, it was found that the insulation resistance of the bushing decreased, but it still met the requirements of relevant standards. Mechanical strength evaluation, based on the data of the pressure sensor and temperature sensor, the mechanical stress and temperature changes that the bushing was subjected to during the fault arc were analyzed. In this test, the bushing was subjected to large mechanical stress, but no obvious deformation or cracking was observed, indicating that its mechanical strength was good. At the same time, the data from the temperature sensor showed that the temperature of the bushing increased significantly during the fault arc, but quickly returned to normal after the test.

[0132] Based on the above analysis, the following evaluation results can be obtained: the 126kV AC transformer bushing can withstand the impact of internal fault arc under the set test conditions, and its insulation performance and mechanical strength are good. The temperature increase of the bushing during the fault arc process is an issue that needs attention. It is recommended to strengthen heat dissipation measures in future design and maintenance to improve the thermal stability of the bushing.

[0133] Conclusion and suggestion: Through the test of this embodiment, the influence of internal fault arc on the bushing of 126kV AC transformer is comprehensively and accurately evaluated. The test results show that the bushing can still maintain good electrical performance and mechanical strength under severe fault arc conditions. However, the temperature rise of the bushing during the fault arc process needs to be paid attention to. Therefore, it is recommended to strengthen heat dissipation measures in future design and maintenance to improve the thermal stability of the bushing. This will help to further improve the safety and reliability of power equipment and ensure the stable operation of the power grid.

[0134] From the above examples, it can be seen that the experimental study of the electrical performance and mechanical strength of AC transformer bushings under severe fault arc conditions using this method has good results.

[0135] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0136] Based on the same inventive concept, the embodiment of the present application also provides an evaluation device for the impact of an internal fault arc on an AC transformer bushing for implementing the above-mentioned evaluation method for the impact of an internal fault arc on an AC transformer bushing. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in the embodiments of the evaluation device for the impact of an internal fault arc on an AC transformer bushing provided below can refer to the limitations of the evaluation method for the impact of an internal fault arc on an AC transformer bushing above, and will not be repeated here.

[0137] In one embodiment, Figure 4 As shown, a device for evaluating the influence of an internal fault arc on an AC transformer bushing is provided, comprising:

[0138] A construction module 410 is used to construct a test platform for internal fault arc; the test platform includes a test circuit for simulating internal fault arc and an insulating bracket for mounting a bushing sample of an AC transformer to be tested;

[0139] The test module 420 is used to simulate arc faults according to the test plan through the test platform and collect operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes test current and test duration;

[0140] The processing module 430 is used to obtain a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc according to the operating parameters;

[0141] The correction module 440 is used to obtain a corrected mechanical property curve according to the test current, test duration and test voltage curves and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample; and obtain a corrected temperature curve according to the test current, test duration and test voltage curves and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample;

[0142] The evaluation module 450 is used to evaluate the influence of the internal fault arc on the AC transformer bushing according to the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve.

[0143] In one embodiment, the device also includes a benchmark determination module for obtaining attribute parameters of the AC transformer bushing sample; obtaining a benchmark voltage curve, a benchmark mechanical performance curve and a benchmark temperature curve based on the attribute parameters; obtaining a benchmark mechanical performance correlation curve based on the benchmark voltage curve, the benchmark mechanical performance curve, and a preset benchmark test current and a benchmark test duration; and obtaining a benchmark temperature performance correlation curve based on the benchmark voltage curve, the benchmark temperature curve, and a preset benchmark test current and a benchmark test duration.

[0144] In one embodiment, the correction module 440 is further used to substitute the test current, test duration and test voltage curves into the benchmark mechanical property correlation curve corresponding to the AC transformer bushing sample to obtain a corrected mechanical property curve; the benchmark mechanical property correlation curve is used to characterize the relationship between current, duration, voltage and mechanical property; and to substitute the test current, test duration and test voltage curves into the benchmark temperature performance correlation curve corresponding to the AC transformer bushing sample to obtain a corrected temperature curve; the benchmark temperature performance correlation curve is used to characterize the relationship between current, duration, voltage and temperature performance.

[0145] In one embodiment, the evaluation module 450 is further used to compare the corrected mechanical property curve with the test mechanical property curve to determine the impact of the internal fault arc on the mechanical properties of the AC transformer bushing; compare the corrected temperature curve with the test temperature curve to determine the impact of the internal fault arc on the temperature performance of the AC transformer bushing; and perform a correlation analysis on the test mechanical property curve and the test temperature curve to determine the relationship between the impact of the internal fault arc on the mechanical properties of the AC transformer bushing and the temperature of the bushing.

[0146] In one embodiment, the operating parameters also include the insulation resistance and dielectric loss tangent of the AC transformer bushing sample; the evaluation module 450 is also used to evaluate the impact of the internal fault arc on the insulation performance of the AC transformer bushing based on the change curve of the insulation resistance and the change curve of the dielectric loss tangent.

[0147] In one embodiment, the processing module 430 is further used to preprocess the operating parameters to obtain preprocessed operating parameters; based on the preprocessed operating parameters, a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc are obtained.

[0148] Each module in the above-mentioned device for evaluating the impact of internal fault arc on AC transformer bushing can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each of the above modules.

[0149] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for evaluating the impact of an internal fault arc on an AC transformer bushing is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0150] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0151] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0152] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0153] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0154] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0155] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0156] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0157] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for evaluating the impact of internal fault arc on AC transformer bushing, characterized in that: The method comprises: Constructing an internal fault arc test platform; the test platform includes a test circuit for simulating an internal fault arc and an insulating bracket for mounting an AC transformer bushing sample to be tested; The test platform simulates an arc fault according to a test plan, and collects operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes a test current and a test duration; According to the operating parameters, a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc are obtained; Acquire the property parameters of the AC transformer bushing sample, and obtain a reference voltage curve, a reference mechanical property curve, and a reference temperature curve according to the property parameters; obtain a reference mechanical property correlation curve according to the reference voltage curve, the reference mechanical property curve, and a preset reference test current and a reference test duration; and obtain a reference temperature performance correlation curve according to the reference voltage curve, the reference temperature curve, and a preset reference test current and a reference test duration; According to the test current, the test duration and the test voltage curve, and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample, a modified mechanical property curve is obtained; according to the test current, the test duration and the test voltage curve, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample, a modified temperature curve is obtained; wherein the reference mechanical property correlation curve is used to characterize the relationship between current, duration, voltage and mechanical property; the reference temperature performance correlation curve is used to characterize the relationship between current, duration, voltage and temperature performance; The influence of the internal fault arc on the bushing of the AC transformer is evaluated based on the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve.

2. The method according to claim 1, characterized in that The step of obtaining a reference voltage curve, a reference mechanical property curve and a reference temperature curve according to the attribute parameters includes: According to the attribute parameters, query the historical database; generating the reference voltage curve, the reference mechanical property curve and the reference temperature curve based on the voltage data, the mechanical property data and the temperature data in the historical database that match the attribute parameters; Comprehensively processing the reference voltage curve, the reference mechanical property curve, the preset reference test current and the reference test duration to obtain the reference mechanical property correlation curve; The reference voltage curve, the reference temperature curve, the preset reference test current and the reference test duration are comprehensively processed to obtain the reference temperature performance correlation curve.

3. The method according to claim 1, characterized in that The modified mechanical property curve is obtained according to the test current, the test duration and the test voltage curve, and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample, including: Substituting the test current, the test duration and the test voltage curve into the reference mechanical property correlation curve corresponding to the AC transformer bushing sample to obtain the modified mechanical property curve; The method of obtaining a corrected temperature curve according to the test current, the test duration, the test voltage curve, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample includes: The test current, the test duration and the test voltage curve are substituted into the reference temperature performance correlation curve corresponding to the AC transformer bushing sample to obtain the corrected temperature curve.

4. The method according to claim 1, characterized in that The step of evaluating the influence of the internal fault arc on the AC transformer bushing according to the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve comprises: Comparing the modified mechanical property curve with the test mechanical property curve to determine the influence of the internal fault arc on the mechanical property of the AC transformer bushing; Comparing the modified temperature curve with the test temperature curve to determine the effect of the internal fault arc on the temperature performance of the AC transformer bushing; And, a correlation analysis is performed on the test mechanical property curve and the test temperature curve to determine the relationship between the influence of the internal fault arc on the mechanical property of the AC transformer bushing and the temperature of the bushing.

5. The method according to claim 1, characterized in that The operating parameters also include the insulation resistance and dielectric loss tangent value of the AC transformer bushing sample; The method further comprises: According to the variation curve of the insulation resistance and the variation curve of the dielectric loss tangent value, the influence of the internal fault arc on the insulation performance of the AC transformer bushing is evaluated.

6. The method according to claim 1, characterized in that The step of obtaining a test voltage curve, a test mechanical property curve and a test temperature curve according to the operating parameters includes: Preprocessing the operating parameters to obtain preprocessed operating parameters; According to the pre-processed operating parameters, a test voltage curve, a test mechanical property curve and a test temperature curve are obtained.

7. An evaluation device for the effect of internal fault arc on AC transformer bushing, characterized in that: The device comprises: A construction module is used to construct a test platform for internal fault arc; the test platform includes a test circuit for simulating internal fault arc and an insulating bracket for mounting a bushing sample of an AC transformer to be tested; A test module, used to simulate an arc fault according to a test plan through the test platform, and collect operating parameters during the test; the operating parameters include arc voltage, bushing pressure and bushing temperature, and the test plan includes a test current and a test duration; A processing module, used for obtaining a test voltage curve, a test mechanical property curve and a test temperature curve of the internal fault arc according to the operating parameters; A benchmark determination module, for obtaining the attribute parameters of the AC transformer bushing sample, and obtaining a benchmark voltage curve, a benchmark mechanical property curve and a benchmark temperature curve according to the attribute parameters; obtaining a benchmark mechanical property correlation curve according to the benchmark voltage curve, the benchmark mechanical property curve, and a preset benchmark test current and a benchmark test duration; and obtaining a benchmark temperature performance correlation curve according to the benchmark voltage curve, the benchmark temperature curve, and a preset benchmark test current and a benchmark test duration; A correction module, used to obtain a corrected mechanical property curve according to the test current, the test duration and the test voltage curve, and the reference mechanical property correlation curve corresponding to the AC transformer bushing sample; and to obtain a corrected temperature curve according to the test current, the test duration and the test voltage curve, and the reference temperature performance correlation curve corresponding to the AC transformer bushing sample; wherein the reference mechanical property correlation curve is used to characterize the relationship between current, duration, voltage and mechanical property; and the reference temperature performance correlation curve is used to characterize the relationship between current, duration, voltage and temperature performance; An evaluation module is used to evaluate the influence of the internal fault arc on the AC transformer bushing according to the modified mechanical property curve and the test mechanical property curve, and the modified temperature curve and the test temperature curve.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for evaluating the influence of an internal arc fault on an AC transformer bushing according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for evaluating the influence of an internal arc fault on an AC transformer bushing according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method for evaluating the influence of an internal fault arc on an AC transformer bushing according to any one of claims 1 to 6 are implemented.

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