A method and system for testing the mechanical and electrical performance of an on-load tap changer insulating support rod under crack defects

Abstract

The application discloses a kind of on-load tap-changer insulation support rod crack defect under electromechanical performance test method and system, belong to electric power equipment detection technical field.The method of the present application comprises: for on-load tap-changer establishes three-level test system, and simulates the actual operation condition of on-load tap-changer insulation support rod based on the three-level test system;Under the actual operation condition, on-load tap-changer test piece is successively carried out normal temperature and high temperature alternate mechanical switching durability test, partial discharge insulation performance test and insulation support rod material performance test, and test and performance data are acquired;Based on the test and performance data, determine the electromechanical performance of on-load tap-changer test piece under insulation support rod crack defect.The application can be comprehensive evaluation epoxy support rod crack defect on the comprehensive influence of equipment operation safety.

Description

Technical Field

[0001] This invention relates to the field of power equipment testing technology, and more specifically, to a method and system for testing the electromechanical performance of an on-load tap changer insulation support rod with crack defects. Background Technology

[0002] On-load tap changers are core components of UHV converter transformers. Their accompanying fiberglass-reinforced epoxy support rods play a crucial role in fixing the stationary contacts and ensuring insulation spacing and mechanical positioning accuracy, directly impacting the operational reliability of the converter transformer and DC transmission projects. After the high-temperature drying process of the converter transformer body during manufacturing, cracks are prone to appear at the bottom of the epoxy support rods of the tap selector. Preliminary assessment suggests this is caused by the release of residual stress within the components after extrusion molding and hole drilling under high-temperature conditions.

[0003] Epoxy support rods serve the dual functions of mechanical support and electrical insulation. Cracks at the bottom can continue to propagate during repeated switching of tap changers, potentially leading to serious risks such as contact displacement, insulation breakdown, and equipment failure. Currently, the industry lacks a comprehensive verification system specifically for epoxy support rods with such cracks. Conventional testing only involves mechanical or insulation tests, which cannot comprehensively assess the combined impact of cracks on the mechanical reliability and insulation performance of tap changers, nor can it accurately trace the root cause of the cracks. Consequently, it cannot provide complete data support for equipment commissioning decisions and process optimization. Summary of the Invention

[0004] To address the above problems, this invention proposes a method for testing the electromechanical performance of an on-load tap changer insulation support rod with crack defects, comprising: A three-level testing system is established for on-load tap changers. The three-level testing system includes: durability test of alternating mechanical switching at normal temperature and high temperature, partial discharge insulation performance test, and insulation support rod material performance test. Based on the three-level testing system, the actual operating conditions of the insulation support rod of the on-load tap changer are simulated. Under the actual operating conditions, the on-load tap changer test specimen was subjected to alternating mechanical switching durability test at room temperature and high temperature, partial discharge insulation performance test, and insulation support rod material performance test in sequence, and the test and performance data were obtained. Based on the aforementioned test and performance data, the electromechanical performance of the on-load tap changer test specimen under the condition of a cracked insulating support rod was determined.

[0005] Optional, alternating mechanical switching durability tests at room temperature and high temperature, including: The on-load tap changer test sample is immersed in an insulating oil tank, and the oil temperature in the insulating oil tank is set not lower than 80°C. When the oil temperature is lower than 80°C, the on-load tap changer test sample is switched. After the switching is completed, the oil temperature in the insulating oil tank is switched to room temperature. When the oil temperature is room temperature, the on-load tap changer test sample is switched. Before and after the on-load tap changer test specimens underwent alternating mechanical switching durability tests at room temperature and high temperature, the changes in cracks in the epoxy support rods were inspected using a strong light.

[0006] Optionally, the number of switching operations performed on the on-load tap changer test sample under the condition of oil temperature below 80℃ is equal to the number of switching operations performed on the on-load tap changer test sample under the condition of oil temperature at room temperature, not less than 50,000 times, and the switching frequency is not less than 10,000 times / day.

[0007] Optionally, before the partial discharge insulation performance test, the on-load tap changer test specimen that has completed the alternating mechanical switching durability test at room temperature and high temperature shall be subjected to vacuum drying treatment.

[0008] Optional, partial discharge insulation performance tests include: After the on-load tap changer test sample, which has undergone vacuum drying, is injected with clean KI50X transformer oil and left to stand for at least 2 hours, a partial discharge insulation performance test is conducted by applying high voltage through short-circuiting of the moving and stationary contacts and grounding the support platform, following the voltage sequence of stepped voltage increase, segmented voltage holding, and gradual voltage decrease.

[0009] Optionally, the rated maximum operating voltage for the partial discharge insulation performance test is Um = 72.5kV.

[0010] Optional, performance testing of the insulating support rod material, including: Ultrasonic crack detection, mechanical property testing, and micromorphology testing were conducted on the cracked insulation support rod of the on-load tap changer test specimen after partial discharge insulation performance test. The cracked insulation support rod and the non-cracked insulation support rod were used as control samples for performance testing. Among them, ultrasonic crack detection is used to detect the potential crack distribution and extension range inside the crack support rod; Mechanical performance testing, including tensile, bending, and impact performance testing, is used to compare the differences in mechanical parameters between cracked and uncracked insulating support rods; Microscopic morphology testing is used to observe the morphological characteristics of crack fracture surfaces and to infer fracture mechanisms based on the observed crack fracture surface morphology characteristics.

[0011] Furthermore, this invention also proposes an electromechanical performance testing system for on-load tap changer insulation support rods with crack defects, comprising: The initial unit is used to establish a three-level test system for on-load tap changers. The three-level test system includes: durability test of alternating mechanical switching at normal temperature and high temperature, partial discharge insulation performance test, and insulation support rod material performance test. Based on the three-level test system, the actual operating conditions of the insulation support rod of the on-load tap changer are simulated. The test unit is used to conduct alternating mechanical switching durability tests at room temperature and high temperature, partial discharge insulation performance tests, and insulation support rod material performance tests on the on-load tap changer test specimen under the actual operating conditions, and to obtain test and performance data. The output unit is used to determine the electromechanical performance of the on-load tap changer test specimen under the condition of a crack in the insulating support rod, based on the test and performance data.

[0012] In another aspect, the present invention also provides a computing device, comprising: one or more processors; A processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, the method described above is implemented.

[0013] In another aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the method described above.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for testing the electromechanical performance of an on-load tap changer under conditions of crack defects in the insulating support rod. The method includes: establishing a three-level testing system for the on-load tap changer, comprising: a durability test for alternating mechanical switching at room temperature and high temperature, a partial discharge insulation performance test, and a material performance test of the insulating support rod; simulating the actual operating conditions of the on-load tap changer's insulating support rod based on the three-level testing system; sequentially performing the alternating mechanical switching durability test at room temperature and high temperature, the partial discharge insulation performance test, and the material performance test of the insulating support rod on the on-load tap changer specimen under these actual operating conditions, and acquiring the test and performance data; and determining the electromechanical performance of the on-load tap changer specimen under conditions of crack defects in the insulating support rod based on the test and performance data. The application of this invention can comprehensively evaluate the overall impact of epoxy support rod crack defects on equipment operational safety. Attached Figure Description

[0015] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a schematic diagram of the crack at the bottom of the tap selector support rod in an embodiment of the method of the present invention; Figure 3 This is a schematic diagram of the mechanical switching test station layout in an embodiment of the method of the present invention; Figure 4 This is a schematic diagram of the pressure application during the insulation test of the tap selector in an embodiment of the method of the present invention; Figure 5 This is a voltage-time sequence diagram for a partial discharge test according to an embodiment of the method of the present invention. Detailed Implementation

[0016] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0017] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0018] Example 1: This invention proposes a method S100 for testing the electromechanical performance of an on-load tap changer insulation support rod with crack defects, such as... Figure 1 As shown, it includes: S101, a three-level test system is established for on-load tap changers. The three-level test system includes: durability test of alternating mechanical switching at normal temperature and high temperature, partial discharge insulation performance test and insulation support rod material performance test. Based on the three-level test system, the actual operating conditions of the insulation support rod of the on-load tap changer are simulated. S102, under the actual operating conditions, the on-load tap changer test specimen is subjected to alternating mechanical switching durability test at room temperature and high temperature, partial discharge insulation performance test, and insulation support rod material performance test in sequence, and test and performance data are obtained. S103, Based on the test and performance data, determine the electromechanical performance of the on-load tap changer test specimen under the condition of a crack in the insulating support rod.

[0019] The durability test involving alternating mechanical switching at room temperature and high temperature includes: The on-load tap changer test sample is immersed in an insulating oil tank, and the oil temperature in the insulating oil tank is set not lower than 80°C. When the oil temperature is lower than 80°C, the on-load tap changer test sample is switched. After the switching is completed, the oil temperature in the insulating oil tank is switched to room temperature. When the oil temperature is room temperature, the on-load tap changer test sample is switched. Before and after the on-load tap changer test specimens underwent alternating mechanical switching durability tests at room temperature and high temperature, the changes in cracks in the epoxy support rods were inspected using a strong light.

[0020] Specifically, the number of switching operations performed on the on-load tap changer test sample under the condition of oil temperature below 80℃ is equal to the number of switching operations performed on the on-load tap changer test sample under the condition of oil temperature at room temperature, not less than 50,000 times, and the switching frequency is not less than 10,000 times / day.

[0021] Before the partial discharge insulation performance test, the on-load tap changer test specimens that have completed the alternating mechanical switching durability test at normal temperature and high temperature are subjected to vacuum drying treatment.

[0022] The partial discharge insulation performance test includes: After the on-load tap changer test sample, which has undergone vacuum drying, is injected with clean KI50X transformer oil and left to stand for at least 2 hours, a partial discharge insulation performance test is conducted by applying high voltage through short-circuiting of the moving and stationary contacts and grounding the support platform, following the voltage sequence of stepped voltage increase, segmented voltage holding, and gradual voltage decrease.

[0023] The rated maximum operating voltage for the partial discharge insulation performance test is Um = 72.5kV.

[0024] The performance testing of the insulating support rod material includes: Ultrasonic crack detection, mechanical property testing, and micromorphology testing were conducted on the cracked insulation support rod of the on-load tap changer test specimen after partial discharge insulation performance test. The cracked insulation support rod and the non-cracked insulation support rod were used as control samples for performance testing. Among them, ultrasonic crack detection is used to detect the potential crack distribution and extension range inside the crack support rod; Mechanical performance testing, including tensile, bending, and impact performance testing, is used to compare the differences in mechanical parameters between cracked and uncracked insulating support rods; Microscopic morphology testing is used to observe the morphological characteristics of crack fracture surfaces and to infer fracture mechanisms based on the observed crack fracture surface morphology characteristics.

[0025] The steps described above will be explained in further detail below: The alternating mechanical switching durability test at normal and high temperatures used an MR2016 tap changer (model VRMII702-72.5 / RD-16311WS) as the test specimen. The tap selector was immersed in KI50X insulating oil, the oil temperature was set to 80℃, and the oil chamber of the switch was kept at normal temperature. The total number of switching cycles was 100,000, including 50,000 cycles at normal temperature and 50,000 cycles at 80℃, with a switching frequency of about 10,000 cycles per day. Before and after the test, the epoxy support rod cracks were checked by irradiation with a strong light.

[0026] The partial discharge insulation performance test requires vacuum drying of the tap selector before the test, followed by injection of clean KI50X transformer oil and standing for 2 hours. The oil quality must meet the requirements of breakdown voltage ≥40kV and water content ≤15ppm, in accordance with the DL / T574-2021 standard. The test adopts a stringent wiring method with all moving and stationary contacts short-circuited to apply high voltage and the support platform grounded. The rated maximum working voltage Um=72.5kV is tested in the sequence of stepped voltage increase-segmented voltage holding-gradual voltage reduction.

[0027] The voltage sequence for the partial discharge insulation performance test is as follows: ① Measure the background partial discharge at 0.4 Um / √3 (16.74 kV), requiring ≤10 pC; ② Increase the voltage to 1.2 Um / √3 (50.23 kV) and hold for 1 min; ③ Increase the voltage to 1.58 Um / √3 (66.14 kV) and hold for 5 min; ④ Increase the voltage to 1.8 Um / √3 (75.35 kV) and hold for 60 s; ⑤ Decrease the voltage to 1.58 Um / √3 and hold for 60 min, recording the partial discharge data every 5 min; ⑥ Decrease the voltage to 1.2 Um / √3 and hold for 1 min; ⑦ Decrease the voltage to 0.4 Um / √3 and remeasure the background partial discharge.

[0028] The pass criteria for the partial discharge insulation performance test are as follows: no voltage breakdown during the test; the continuous level of partial discharge during the 60-minute holding phase at 1.58 Um / √3 does not exceed 50 pC; the partial discharge does not show a continuous upward trend or sudden continuous increase during the last 20 minutes of holding; the partial discharge does not exceed 30 pC at 1.2 Um / √3 after the holding phase ends; if the third criterion is not met but the partial discharge during the 60-minute holding phase is always ≤30 pC, the test is still considered to be qualified.

[0029] The performance testing of epoxy support rod materials includes three aspects: ultrasonic crack detection, mechanical property testing, and microstructure testing. Cracked support rods and uncracked support rods were selected as control samples for testing.

[0030] Among them, ultrasonic crack detection is used to detect the distribution and extension range of potential cracks inside the support rod; the mechanical property test includes tensile, bending and impact performance tests to compare the differences in mechanical parameters between cracked and intact samples; the micromorphology test is used to observe the crack fracture morphology characteristics and infer the fracture mechanism based on the morphology.

[0031] In the specific implementation process, the problem of cracks at the bottom of the epoxy support rod of the static contact of the ±800kV converter transformer MR tap selector was addressed, such as... Figure 2 As shown, mechanical switching tests, insulation tests, and material performance tests were carried out in sequence to comprehensively verify the impact of crack defects. The mechanical switching test adopts the MR2016 version of on-load tap-changer (model VRMII702-72.5 / RD-16311WS) as the test sample, and the test sample is installed and arranged in the mechanical switching test oil barrel, as shown in Figure 3 , the automatic oil circulation system is used to fill the tank with KI50X insulating oil to ensure that the tap selector is completely immersed, and the oil temperature is set to 80°C; the oil chamber of the diverter switch is filled with insulating oil and kept at normal temperature. A custom-made gear ratio box, an operating mechanism and a transmission connecting rod are matched to match the action parameters of the tap-changer. The total number of switching times in the test is 100,000, which is carried out alternately at normal temperature and high temperature of 80°C, with 50,000 times each, and the switching frequency is about 10,000 times per day; before and after the test, a strong light lamp is used for irradiation inspection, and the crack change of the epoxy support rod is recorded.

[0032] As shown in Figure 4 and 5 , in the partial discharge insulation test, the tap selector that has completed the mechanical test is vacuum-dried, hoisted to the insulation test oil barrel, and filled with clean KI50X transformer oil. After oil injection, the sample is left to stand for 2 hours, and the test can be carried out after the breakdown voltage of the oil sample is detected to be ≥40kV and the micro-water content is ≤15ppm. In the test, all the moving and static contacts of the tap selector are short-circuited to apply high voltage, the support platform is grounded, and the voltage time sequence is executed according to Um=72.5kV: first, the background partial discharge is measured at 0.4Um / √3 (16.74kV), requiring ≤10pC; the voltage is sequentially increased to 1.2Um / √3 (50.23kV) for 1min, 1.58Um / √3 (66.14kV) for 5min, and 1.8Um / √3 (75.35kV) for 60s; then the voltage is continuously reduced to 1.58Um / √3 and kept for 60min, and the partial discharge level is measured and recorded every 5min; after the pressure holding is completed, the voltage is reduced to 1.2Um / √3 for 1min, and finally the voltage is reduced to 0.4Um / √3 to re-measure the background partial discharge. The test is judged to be qualified if there is no breakdown drop, the partial discharge during the 60min pressure holding stage is ≤50pC, the partial discharge has no continuous upward trend, and the partial discharge at 1.2Um / √3 is ≤30pC.

[0033] After the insulation test is completed, the tap selector is disassembled, and the epoxy support rods with cracks and without cracks are selected to carry out material performance tests respectively: the distribution of potential internal cracks is detected by ultrasonic crack flaw detection; the difference in mechanical properties is compared through tensile, bending and impact tests; the characteristics of the crack fracture are observed through microscopic morphology tests to analyze the root cause of crack generation.

[0034] Embodiment 2: The present invention further proposes a electromechanical performance testing system 200 for on-load tap-changers under crack defects of insulating support rods, comprising: The initial unit 201 is used to establish a three-level test system for on-load tap changers. The three-level test system includes: alternating mechanical switching durability test at room temperature and high temperature, partial discharge insulation performance test, and insulation support rod material performance test. Based on the three-level test system, the actual operating conditions of the insulation support rod of the on-load tap changer are simulated. The test unit 202 is used to conduct alternating mechanical switching durability tests at room temperature and high temperature, partial discharge insulation performance tests, and insulation support rod material performance tests on the on-load tap changer test specimen under the actual operating conditions, and to obtain test and performance data. Output unit 203 is used to determine the electromechanical performance of the on-load tap changer test specimen under the condition of a crack in the insulating support rod, based on the test and performance data.

[0035] Compared to traditional single-performance testing, this invention constructs a three-level comprehensive test system of "mechanical durability, electrical insulation, and intrinsic material properties," which fully simulates the actual working conditions of UHV converter transformer tap changers, including high-temperature drying, long-term switching, and high-voltage operation. It can comprehensively evaluate the overall impact of epoxy support rod crack defects on equipment operation safety. The test process and criteria strictly follow power industry standards, and the test results are rigorous and reliable. It can provide technical basis for the decision to put defective equipment into operation, and also provide data support for the prevention and control of epoxy component cracks from the material and process perspectives, thus possessing strong engineering application value.

[0036] Example 3: Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement corresponding method flows or corresponding functions, thereby implementing the steps of the methods in the above embodiments.

[0037] Example 4: Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiments.

[0038] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0039] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0040] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0041] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0042] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0043] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for testing the electromechanical performance of an on-load tap changer insulation support rod with crack defects, characterized in that, include: A three-level testing system is established for on-load tap changers. The three-level testing system includes: durability test of alternating mechanical switching at normal temperature and high temperature, partial discharge insulation performance test, and insulation support rod material performance test. Based on the three-level testing system, the actual operating conditions of the insulation support rod of the on-load tap changer are simulated. Under the actual operating conditions, the on-load tap changer test specimen was subjected to alternating mechanical switching durability test at room temperature and high temperature, partial discharge insulation performance test, and insulation support rod material performance test in sequence, and the test and performance data were obtained. Based on the aforementioned test and performance data, the electromechanical performance of the on-load tap changer test specimen under the condition of a cracked insulating support rod was determined.

2. The electromechanical performance testing method according to claim 1, characterized in that, The alternating mechanical switching durability test at room temperature and high temperature includes: The on-load tap changer test sample is immersed in an insulating oil tank, and the oil temperature in the insulating oil tank is set not lower than 80°C. When the oil temperature is lower than 80°C, the on-load tap changer test sample is switched. After the switching is completed, the oil temperature in the insulating oil tank is switched to room temperature. When the oil temperature is room temperature, the on-load tap changer test sample is switched. Before and after the on-load tap changer test specimens underwent alternating mechanical switching durability tests at room temperature and high temperature, the changes in cracks in the epoxy support rods were inspected using a strong light.

3. The electromechanical performance testing method according to claim 2, characterized in that, When the oil temperature is below 80℃, the number of switching operations performed on the on-load tap changer test specimen is equal to the number of switching operations performed on the on-load tap changer test specimen when the oil temperature is at room temperature, not less than 50,000 times, and the switching frequency is not less than 10,000 times / day.

4. The electromechanical performance testing method according to claim 1, characterized in that, Before the partial discharge insulation performance test, the on-load tap changer test specimens that have completed the alternating mechanical switching durability test at room temperature and high temperature are subjected to vacuum drying treatment.

5. The electromechanical performance testing method according to claim 1, characterized in that, The partial discharge insulation performance test includes: After the on-load tap changer test sample, which has undergone vacuum drying, is injected with clean KI50X transformer oil and left to stand for at least 2 hours, a partial discharge insulation performance test is conducted by applying high voltage through short-circuiting of the moving and stationary contacts and grounding the support platform, following the voltage sequence of stepped voltage increase, segmented voltage holding, and gradual voltage decrease.

6. The electromechanical performance testing method according to claim 5, characterized in that, The rated maximum operating voltage for the partial discharge insulation performance test is Um = 72.5kV.

7. The electromechanical performance testing method according to claim 1, characterized in that, The performance testing of the insulating support rod material includes: Ultrasonic crack detection, mechanical property testing, and micromorphology testing were conducted on the cracked insulation support rod of the on-load tap changer test specimen after partial discharge insulation performance test. The cracked insulation support rod and the non-cracked insulation support rod were used as control samples for performance testing. Among them, ultrasonic crack detection is used to detect the potential crack distribution and extension range inside the crack support rod; Mechanical performance testing, including tensile, bending, and impact performance testing, is used to compare the differences in mechanical parameters between cracked and uncracked insulating support rods; Microscopic morphology testing is used to observe the morphological characteristics of crack fracture surfaces and to infer fracture mechanisms based on the observed crack fracture surface morphology characteristics.

8. A system for testing the electromechanical performance of an on-load tap changer insulation support rod with crack defects, characterized in that, include: The initial unit is used to establish a three-level test system for on-load tap changers. The three-level test system includes: durability test of alternating mechanical switching at normal temperature and high temperature, partial discharge insulation performance test, and insulation support rod material performance test. Based on the three-level test system, the actual operating conditions of the insulation support rod of the on-load tap changer are simulated. The test unit is used to conduct alternating mechanical switching durability tests at room temperature and high temperature, partial discharge insulation performance tests, and insulation support rod material performance tests on the on-load tap changer test specimen under the actual operating conditions, and to obtain test and performance data. The output unit is used to determine the electromechanical performance of the on-load tap changer test specimen under the condition of a crack in the insulating support rod, based on the test and performance data.

9. A computer device, characterized in that, include: One or more processors; A processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, the method described in any one of claims 1-7 is implemented.

10. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements the method as described in any one of claims 1-7.

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