Pressure sensor special for arcing test of transformer bushing, test method, test system and computer equipment

Abstract

The invention relates to a pressure sensor special for a transformer bushing arcing test, a test method, a test system and computer equipment. The special pressure sensor for the arcing test of the transformer bushing comprises a magnetic isolation outer cover, a high-frequency pressure sensor, an insulating voltage-resistant pipe and a data transmission line. The magnetic isolation outer cover is used for providing a closed cavity for isolating a magnetic field signal; the high-frequency pressure sensor is mounted in the closed cavity; a first end of the insulating voltage-withstanding pipe is mechanically connected with the magnetic isolation outer cover, a second end of the insulating voltage-withstanding pipe is mechanically connected with a pressure test point of the transformer bushing, and the insulating voltage-withstanding pipe is provided with a pressure leading hole communicated with the transformer bushing and the high-frequency pressure sensor; and the data transmission line is electrically connected with the high-frequency pressure sensor. By adopting the pressure sensor special for the arcing test of the transformer bushing, the problem that a pressure sensor suitable for harsh working conditions is lacked in an existing burning explosion test of the transformer bushing can be solved.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a pressure sensor, a test method, a test system and a computer device specially used for transformer bushing arcing test. Background Art

[0002] With the development of the electric power industry, high-voltage bushings, as key components of power transmission and transformation projects, have insulation and mechanical support functions. Their harsh operating conditions and compact structure cause them to have many prominent problems such as local discharge, and the secondary hazards of arc faults and explosions inside the bushings are relatively large.

[0003] Although progress has been made in the research and development and application of bushings, the current research on transformer bushings at home and abroad is mostly focused on the application of new materials, and the test research on its explosion-proof performance has not yet been carried out. There is a safety hazard that the bushing explosion will cause transformer failure and then lead to a large-scale power outage in the power grid. The test environment of the transformer bushing arc test is extremely harsh, and it is in a strong magnetic field, strong electric field, strong impact pressure and instantaneous high temperature state. Although the current piezoresistive pressure sensor has high accuracy, it cannot withstand this harsh working condition. Although the optical fiber pressure sensor is not affected by strong magnetic field, strong electric field and high temperature, the measurement accuracy is not high. Therefore, it is necessary to conduct in-depth research on the bushing arc test method and explosion-proof performance and solve related technical problems. Summary of the invention

[0004] Based on this, it is necessary to provide a special pressure sensor, test method, test system and computer equipment for transformer bushing arcing test in order to solve the above technical problems.

[0005] In a first aspect, the present application provides a pressure sensor for transformer bushing arcing test, comprising:

[0006] A magnetic isolation cover is used to provide a closed chamber that isolates magnetic field signals;

[0007] A high-frequency pressure sensor is installed in a sealed chamber;

[0008] An insulating pressure-resistant tube, wherein the first end of the insulating pressure-resistant tube is mechanically connected to the magnetic isolation cover, the second end of the insulating pressure-resistant tube is mechanically connected to the pressure test point of the transformer bushing, and the insulating pressure-resistant tube has a pressure-leading hole connected to the transformer bushing and the high-frequency pressure sensor;

[0009] The data transmission line is electrically connected to the high-frequency pressure sensor.

[0010] In one embodiment, it also includes:

[0011] The spiral water-cooling heat dissipation structure is arranged around the periphery of the high-frequency pressure sensor.

[0012] In one embodiment, the periphery of the data transmission line is wrapped with a metal shielding hose.

[0013] In one embodiment, the first end of the insulating pressure-resistant tube has a mounting thread, and the mounting thread matches the mounting screw hole at the pressure test point of the transformer bushing.

[0014] In a second aspect, the present application further provides a transformer bushing arcing test method, which is applied to a transformer bushing arcing test system, the system comprising a plurality of transformer bushing arcing test dedicated pressure sensors as in the above embodiment, the method comprising:

[0015] Obtaining the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing;

[0016] The arcing test result of the transformer bushing is determined based on the arc pressure wave transmission path and the pressure values ​​at multiple pressure test points.

[0017] In one embodiment, before the step of obtaining the arc pressure wave transmission path, the method includes:

[0018] According to the internal structure of the transformer bushing, the shortest oil path between the arc occurrence point of the transformer bushing and the pressure relief valve of the transformer bushing is determined, and the shortest oil path is determined as the arc pressure wave transmission path.

[0019] In one embodiment, after the step of obtaining the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing, and before the step of determining the arcing test result of the transformer bushing according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points, the step further includes:

[0020] Obtain pressure compensation parameters corresponding to multiple pressure test points;

[0021] Correct the pressure value of the corresponding pressure test point according to the pressure compensation parameter.

[0022] In one embodiment, after the step of obtaining the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing, and before the step of determining the transformer bushing arcing test result according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points, the step further includes:

[0023] Obtain the temperature of the transformer bushing and the pressure compensation parameters corresponding to the temperature;

[0024] Correct the pressure values ​​of multiple pressure test points according to the pressure compensation parameters.

[0025] In a third aspect, the present application also provides a transformer bushing arcing test system, the system comprising:

[0026] A plurality of pressure sensors for transformer bushing arcing test as in the above embodiments;

[0027] The computer device is electrically connected to the data transmission line of the special pressure sensor for transformer bushing arcing test, and is used to execute the transformer bushing arcing test method as described in the above embodiment.

[0028] In a fourth aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method in the above embodiment when executing the computer program.

[0029] The above transformer bushing arcing test dedicated pressure sensor, test method, test system and computer equipment have at least the following beneficial effects:

[0030] By forming a closed chamber that isolates the magnetic field signal through the magnetic isolation cover, the high-frequency pressure sensor can be prevented from being damaged by the blasting impact force, and can also resist the interference of the external magnetic field to ensure the accuracy of the measurement data; the high-frequency pressure sensor has high-precision measurement capability and the measurement error is controlled within a small range. The use of high-temperature resistant materials and thermal isolation technology can reliably operate in a high-temperature environment with a wide temperature range without affecting the accuracy and stability; the insulating pressure-resistant tube not only connects the transformer bushing and the high-frequency pressure sensor, but also prevents the influence of high-voltage discharge on the sensor performance, and plays a role in high-voltage insulation protection; and multiple special pressure sensors can be connected to multiple test pressure points of the transformer bushing to collect data, and then transmitted to the terminal for analysis and processing via the data transmission line, which is helpful to accurately obtain the arc test results of the transformer bushing, and solves the problem of the lack of pressure sensors suitable for harsh working conditions in the existing transformer bushing explosion test. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic diagram of the structure of a special pressure sensor for transformer bushing arcing test in one embodiment;

[0033] Figure 2 A schematic diagram of the application environment of a special pressure sensor for transformer bushing arcing test in one embodiment;

[0034] Figure 3 A schematic diagram of a flow chart of a transformer bushing arcing test method in one embodiment;

[0035] Figure 4 A schematic flow chart of a transformer bushing arcing test method in another embodiment;

[0036] Figure 5 A schematic flow chart of a transformer bushing arcing test method in another embodiment;

[0037] Figure 6 A schematic diagram of a flow chart of a transformer bushing arcing test method in yet another embodiment;

[0038] Figure 7 A structural block diagram of a transformer bushing arcing test device in one embodiment;

[0039] Figure 8 FIG. 4 is a block diagram of the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0043] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0044] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0045] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0046] With the rapid development of the electric power industry, high-voltage bushings, as one of the key components of power transmission and transformation projects, are used for high-voltage current-carrying conductors to pass through shells or walls with different potentials, playing the role of insulation and mechanical support. Unlike many high-voltage power transmission and transformation equipment, high-voltage bushings have the following characteristics: harsh operating conditions and compact structure. Its structural form determines that this type of bushing has a large aspect ratio and concentrated axial and radial electric fields. The bushing body is a composite insulation structure of liquid and solid materials. Under the joint action of electrical, mechanical and thermal stresses, it presents various complex dielectric properties and structural characteristics. Problems such as partial discharge, electrical connection, mechanical strength matching and sealing are more prominent, especially the secondary hazards of explosion accidents caused by arc faults inside the bushing are relatively large.

[0047] However, the inventors found that although great progress has been made in the research and development and application of bushings after years of development and accumulation, the current research on transformer bushings at home and abroad is mainly focused on the application of new materials, reliability research and test technology research. Arc faults and pressure characteristics at other locations of transformers (such as risers, box simulations, etc.) have been studied, but the test research on the explosion-proof performance of transformer bushings has not yet been carried out. As a result, transformer failures caused by bushing explosions, and further safety hazards such as large-scale power outages in the power grid, have always existed. Therefore, it is necessary to conduct in-depth research on the bushing arc test method and explosion-proof performance. The arc test simulates the internal arc fault of the bushing, and the test environment of the transformer bushing arc test is extremely harsh. The test environment of the transformer bushing arc test is extremely harsh, and it will be in a state of strong magnetic field, strong electric field and strong impact pressure and instantaneous high temperature generated by explosion. At present, one of the difficulties in the research of transformer bushing explosion tests is that there is no pressure sensor suitable for this harsh working condition.

[0048] Based on the above reasons, in an exemplary embodiment, Figure 1As shown, the present application provides a special pressure sensor for transformer bushing arcing test, including a magnetic isolation cover 2, a high-frequency pressure sensor 4, an insulating pressure-resistant tube 6 and a data transmission line 8. The magnetic isolation cover 2 is used to provide a closed chamber that isolates magnetic field signals; the high-frequency pressure sensor 4 is installed in the closed chamber; the first end of the insulating pressure-resistant tube 6 is mechanically connected to the magnetic isolation cover 2, the second end of the insulating pressure-resistant tube 6 is mechanically connected to the pressure test point of the transformer bushing, and the insulating pressure-resistant tube 6 has a pressure-leading hole 64 connecting the transformer bushing and the high-frequency pressure sensor 4; the data transmission line 8 is electrically connected to the high-frequency pressure sensor 4.

[0049] Among them, Figure 1 As shown, the high-frequency pressure sensor 4 is a force-sensitive element made using SOI polysilicon technology, with high-precision measurement capabilities, and the measurement error is controlled within a specific range (e.g., within ±0.1% FS). The high-frequency pressure sensor 4 uses high-temperature resistant materials and thermal isolation technology to ensure that the high-frequency pressure sensor 4 can operate reliably in a wide temperature range (e.g., a temperature range of -40°C to +800°C), and the measurement accuracy and stability are not affected. An insulating pressure-resistant tube 6 made of high-strength insulating material (e.g., epoxy glass fiber wound tube) is set at the front end of the high-frequency pressure sensor 4, which is used to connect with Figure 2 The transformer bushing test piece shown plays a connecting role. On the other hand, it mainly prevents the high-voltage discharge from affecting the performance of the high-frequency pressure sensor 4 when the test voltage is applied in the arc test (the test voltage is several thousand volts to several tens of kilovolts), and plays a role in high-voltage insulation protection. The high-frequency pressure sensor 4 is provided with a magnetic shielding structure outer cover made of high-strength non-magnetic material (such as stainless steel material) on the outside. On the one hand, it is used to avoid the damage to the high-frequency pressure sensor 4 caused by the blasting impact force during the arc test. On the other hand, when the test current is applied in the arc test (the test current is several thousand amperes to several tens of kiloamperes), the high-frequency pressure sensor 4 has the ability to resist the interference of the external magnetic field, ensuring that when the magnetic field strength reaches the preset value (such as tens of gauss to hundreds of gauss), the accuracy of the measurement data is not affected.

[0050] For example, when performing an arc test, multiple transformer bushing arc test dedicated pressure sensors can be connected to the high-frequency pressure sensor 4 through the insulating pressure-resistant tube 6 provided at the front end thereof. Figure 2 The transformer bushing has multiple pressure points as shown in Figure 2 As shown in the red box, one red box is one pressure test point X), which are connected one by one to collect the pressure values ​​of different pressure test points of the transformer bushing during the arc test. The terminal is connected through the data transmission line 8 to transmit the collected pressure value data to the terminal, etc., so that the terminal can perform further analysis and processing to obtain the arc test results of the transformer bushing.

[0051] The above-mentioned transformer bushing arc test special pressure sensor forms a closed chamber that isolates the magnetic field signal through a magnetic isolation outer cover, which can avoid the explosion impact force from damaging the high-frequency pressure sensor, and can also resist the interference of the external magnetic field to ensure the accuracy of the measurement data; the high-frequency pressure sensor has high-precision measurement capability and the measurement error is controlled within a small range. It adopts high-temperature resistant materials and thermal isolation technology, and can operate reliably in a high-temperature environment with a wide temperature range without affecting the accuracy and stability; the insulating pressure-resistant tube not only connects the transformer bushing with the high-frequency pressure sensor, but also prevents the influence of high-voltage discharge on the sensor performance, and plays a role in high-voltage insulation protection; and multiple special pressure sensors can be connected to multiple test pressure points of the transformer bushing to collect data, and then transmitted to the terminal for analysis and processing via a data transmission line, which is helpful to accurately obtain the arc test results of the transformer bushing, and solves the problem of the lack of pressure sensors suitable for harsh working conditions in the existing transformer bushing explosion test.

[0052] In an exemplary embodiment, Figure 1 As shown, the transformer bushing arcing test dedicated pressure sensor also includes a spiral water cooling and heat dissipation structure 42. The spiral water cooling and heat dissipation structure 42 is arranged around the periphery of the high-frequency pressure sensor 4.

[0053] For example, when the transformer bushing arc test is performed, a momentary high temperature environment will be generated, and circulating cooling water can be introduced into the spiral water-cooling heat dissipation structure 42. The cooling water flows continuously in the spiral pipe, and due to its large specific heat capacity, it can absorb a large amount of heat. The spiral design allows the cooling water to have a large contact area with the periphery of the high-frequency pressure sensor 4, so that during the flow of the cooling water, the heat absorbed by the high-frequency pressure sensor 4 due to being in a high temperature environment can be efficiently taken away, avoiding the high-frequency pressure sensor 4 from experiencing performance degradation and component damage due to excessive temperature, thereby ensuring that it can still operate reliably in the high temperature environment generated by the arc test, maintaining stable and accurate measurement accuracy, and providing strong support for the pressure data collection work of the entire transformer bushing arc test.

[0054] In an exemplary embodiment, Figure 1 As shown, the periphery of the data transmission line 8 is wrapped with a metal shielding hose.

[0055] Exemplarily, the circuit design of the high-frequency pressure sensor 4 includes electrostatic protection and filtering circuits, and the periphery of the data transmission line 8 is wrapped with a metal shielding hose, which is used to protect the data transmission line 8 from damage caused by explosion impact force and other external forces during the transformer bushing arc test, while ensuring the reliable operation of the data transmission line 8 in a complex electromagnetic environment.

[0056] In an exemplary embodiment, Figure 1As shown, the first end of the insulating pressure-resistant tube 6 has a mounting thread 62, and the mounting thread 62 matches the mounting screw hole of the pressure test point of the transformer bushing.

[0057] For example, the threaded matching connection method enables the insulating pressure-resistant tube 6 and the pressure test point of the transformer bushing to be firmly and tightly connected. During the transformer bushing arc test, even in the face of complex and harsh working conditions such as strong impact pressure, instantaneous high temperature, strong electric field, and strong magnetic field, it can effectively avoid measurement errors or data acquisition interruptions caused by loose connections, thereby ensuring the stability and continuity of pressure data collection, and providing reliable basic conditions for subsequent accurate analysis of the transformer bushing arc test results.

[0058] In an exemplary embodiment, Figure 3 As shown, the present application also provides a transformer bushing arcing test method, which is applied to a transformer bushing arcing test system. The system includes a plurality of transformer bushing arcing test dedicated pressure sensors as in the above embodiment. The method includes:

[0059] S302, obtaining an arc pressure wave transmission path of the transformer bushing and pressure values ​​of multiple pressure test points of the transformer bushing.

[0060] Among them, the arc pressure wave transmission path of the transformer bushing may refer to the route that the pressure wave generated by the arc discharge propagates inside the bushing. Due to the complex internal structure of the bushing, the pressure wave will be affected by various factors during the propagation process and change the propagation direction and speed. Determining its transmission path can help understand the propagation law of the pressure wave in the bushing and the order of influence on different parts of the bushing. The pressure values ​​of multiple pressure test points of the transformer bushing may refer to the maximum pressure values ​​that can be reached at different positions inside the bushing after an arc discharge fault occurs in the transformer bushing. These different points are distributed in different areas inside the bushing, such as the position close to the arc source, different axial and radial positions of the bushing, etc. Measuring the maximum pressure values ​​of these points helps to fully understand the pressure distribution inside the bushing under fault conditions.

[0061] For example, the arc pressure wave transmission path of the transformer bushing can be determined based on the structural design parameters of the transformer bushing (such as the distribution of solid insulating materials, the shape and size of the oil channel, the position of metal parts, etc.). The pressure values ​​of multiple pressure test points of the transformer bushing can be collected by a transformer bushing arc test dedicated pressure sensor set at different pressure test points of the transformer bushing.

[0062] S304, determining an arcing test result of the transformer bushing according to the arc pressure wave transmission path and the pressure values ​​of the plurality of pressure test points.

[0063] Exemplarily, based on the determined arc pressure wave transmission path, simulation is performed using methods such as fluid dynamics calculations to obtain the flow velocity and pressure distribution of the arc pressure wave transmission path (such as the pressure values ​​at different pressure test points), and then the pressure values ​​collected at multiple pressure test points are compared with the pressure distribution obtained by simulation, so as to complete the arc test impact assessment of the transformer bushing, thereby determining the arc test results of the transformer bushing.

[0064] In this embodiment, by determining the arc pressure wave transmission path based on the bushing structural design parameters, we can deeply understand the law of pressure wave propagation and the order of influence on various parts of the bushing, which is helpful to find potential problems in the structural design. Secondly, by using a special pressure sensor to collect pressure values ​​at multiple points, we can fully grasp the pressure distribution when the bushing fails internally, and provide rich data for evaluating the performance of the bushing. Furthermore, the flow velocity and pressure distribution of the pressure wave transmission path are simulated by fluid dynamics calculation and simulation, and compared with the actual collected pressure value, to achieve an accurate assessment of the impact of the arc test, and can more accurately judge the performance of the bushing in the arc test, which provides a reliable basis for improving the bushing design, optimizing the structure, improving the material performance and ensuring the safe operation of the transformer, and effectively improves the scientificity and reliability of the research and development and operation and maintenance of the transformer bushing.

[0065] In an exemplary embodiment, Figure 4 As shown, before the step of obtaining the arc pressure wave transmission path, it includes:

[0066] S402, determining the shortest oil path between the arc occurrence point of the transformer bushing and the pressure relief valve of the transformer bushing according to the internal structure of the transformer bushing, and determining the shortest oil path as the arc pressure wave transmission path.

[0067] For example, detailed structural information is obtained from the design drawings and technical documents of the transformer bushing, including the shape, size, direction, branching of the oil channel, and the area where the arc may occur and the precise position of the pressure relief valve. At the same time, the physical property parameters of the transformer oil used in the bushing are collected, such as density, viscosity, elastic modulus, etc. at different temperatures. Based on the collected design data, a three-dimensional geometric model of the oil circuit inside the transformer bushing is constructed. The constructed geometric model can be analyzed by using a shortest path algorithm based on graph theory (such as Dijkstra algorithm, A* algorithm, etc.). For example, the oil channel and the connection part in the oil circuit are regarded as nodes and edges, and the weight between the nodes is calculated (which can be determined according to factors such as oil channel length, pipe diameter, medium characteristics, etc.) to determine the shortest oil path between the arc occurrence point and the pressure relief valve.

[0068] In this embodiment, the three-dimensional geometric model is constructed based on the design drawings and technical documents of the transformer bushing to obtain structural information and physical property parameters of the transformer oil, which can highly restore the actual situation of the internal oil circuit and provide an accurate basis for subsequent analysis. The shortest path algorithm based on graph theory is used to determine the shortest oil path between the arc occurrence point and the pressure relief valve, and the node weight is calculated by comprehensively considering various factors of the oil channel, so that the path determination is more scientific and reasonable, which helps to accurately grasp the most likely rapid propagation path of the pressure wave in the bushing, thereby providing a key basis for evaluating the performance of the bushing under arcing conditions.

[0069] In an exemplary embodiment, Figure 5 As shown, after the step of obtaining the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing, before the step of determining the arcing test result of the transformer bushing according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points, it also includes:

[0070] S502: Obtain pressure compensation parameters corresponding to multiple pressure test points.

[0071] S504: Correct the pressure value of the corresponding pressure test point according to the pressure compensation parameter.

[0072] Exemplarily, before determining the arc test result of the transformer bushing according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points, the pressure values ​​collected at different pressure test points are corrected through a preset mapping relationship table of pressure test points and pressure compensation parameters to eliminate the influence of position deviation on the pressure readings and ensure the accuracy of the measurement results. Among them, the preset mapping relationship table of pressure test points and pressure compensation parameters can be a mapping relationship table constructed after pressure tests are performed on multiple pressure test points in the preparation stage of the arc test to obtain the pressure values ​​corresponding to each pressure test point.

[0073] In this embodiment, by obtaining the pressure compensation parameters and correcting the pressure value of the pressure test point, the measurement error problem caused by the different installation positions of the pressure sensor can be effectively solved. In the arc test scenario, the pressure value is accurately corrected according to the preset mapping relationship table to ensure that the measurement results more truly reflect the actual pressure conditions inside the bushing. It not only improves the accuracy of a single pressure test data, but also makes the evaluation of the arc test results based on multiple pressure test point data more reliable, providing solid data support for accurately judging the performance of the transformer bushing, discovering potential problems, optimizing the bushing design, and ensuring the safe and stable operation of the transformer, greatly improving the scientificity and effectiveness of the entire test process and subsequent evaluation.

[0074] In an exemplary embodiment, Figure 6As shown, after the step of obtaining the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing, before the step of determining the transformer bushing arcing test result according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points, it also includes:

[0075] S602, obtaining the temperature of the transformer bushing and a pressure compensation parameter corresponding to the temperature.

[0076] S604, correcting the pressure values ​​of the multiple pressure test points according to the pressure compensation parameters.

[0077] Exemplarily, before determining the arc test result of the transformer bushing according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points, the pressure values ​​collected at different pressure test points are corrected by a preset mapping relationship table of temperature-pressure compensation parameters of the transformer bushing to eliminate the influence of temperature deviation on the pressure reading and ensure the accuracy of the measurement result. Among them, the preset mapping relationship table of temperature-pressure compensation parameters of the transformer bushing can be constructed by testing in the preparation stage of the arc test, and is specifically constructed as follows: taking 20°C as the reference temperature, recording the corresponding pressure value of each pressure test point of the transformer bushing at the reference temperature, and using this as the reference pressure value of each pressure test point; by changing the temperature of the transformer bushing, recording the relative change value of each pressure test point after the transformer bushing changes relative to the reference temperature, and using this as the pressure compensation parameter of each pressure test point at different temperatures, and using this to construct a mapping relationship table of temperature-pressure compensation parameters of the transformer bushing.

[0078] In the above embodiment, by obtaining the temperature of the transformer bushing and the corresponding pressure compensation parameters, and correcting the pressure value of the pressure test point accordingly, the interference of temperature change on the accuracy of pressure measurement can be effectively overcome. In the transformer bushing arc test, temperature changes will significantly affect the performance of the pressure sensor, and correction based on the constructed temperature-pressure compensation parameter mapping relationship table can make the pressure measurement value more accurately reflect the actual pressure state inside the bushing, and is not affected by temperature fluctuations. The reliability of the pressure test data is greatly improved, thereby providing a solid guarantee for accurately evaluating the arc test results based on the arc pressure wave transmission path and pressure value, which helps to more accurately judge the bushing performance and discover potential problems in a timely manner.

[0079] In an exemplary embodiment, the present application further provides a transformer bushing arcing test system, which includes a plurality of transformer bushing arcing test dedicated pressure sensors and a computer device as in the above embodiments. The computer device is electrically connected to the data transmission line of the transformer bushing arcing test dedicated pressure sensor, and is used to execute the transformer bushing arcing test method as in the above embodiments.

[0080] 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.

[0081] Based on the same inventive concept, the embodiment of the present application also provides a transformer bushing arcing test device for implementing the transformer bushing arcing test method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more transformer bushing arcing test device embodiments provided below can refer to the limitations of the transformer bushing arcing test method above, and will not be repeated here.

[0082] In an exemplary embodiment, Figure 7 As shown, a transformer bushing arcing test device is provided, wherein:

[0083] The data acquisition module 702 is used to obtain the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing.

[0084] The data analysis module 704 is used to determine the arcing test result of the transformer bushing according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points.

[0085] In an exemplary embodiment, the transformer bushing arcing test device further includes:

[0086] The arc pressure wave transmission path determination module is used to determine the shortest oil path between the arc occurrence point of the transformer bushing and the pressure relief valve of the transformer bushing according to the internal structure of the transformer bushing, and determine the shortest oil path as the arc pressure wave transmission path.

[0087] In an exemplary embodiment, the transformer bushing arcing test device further includes:

[0088] The first pressure compensation parameter acquisition module is used to obtain pressure compensation parameters corresponding to multiple pressure test points.

[0089] The first correction module is used to correct the pressure value of the corresponding pressure test point according to the pressure compensation parameter.

[0090] In an exemplary embodiment, the transformer bushing arcing test device further includes:

[0091] The second pressure compensation parameter acquisition module is used to obtain the temperature of the transformer bushing and the pressure compensation parameter corresponding to the temperature.

[0092] The second correction module is used to correct the pressure values ​​of multiple pressure test points according to the pressure compensation parameters.

[0093] Each module in the above transformer bushing arcing test device can be implemented in whole or in part by software, hardware and their combination. Each module can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each module above.

[0094] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 8 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. 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 input / output interface of the computer device is used to exchange information between the processor and an external device. 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 implemented through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a transformer bushing arcing test method is implemented. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen 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 covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0095] Those skilled in the art will understand that Figure 8The 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.

[0096] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps of the method in the above embodiment when executing the computer program.

[0097] 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 of the method in the above embodiment are implemented.

[0098] In one embodiment, a computer program product is provided, including a computer program, which implements the steps of the method in the above embodiment when executed by a processor.

[0099] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method 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 the present application can include at least one of non-volatile memory 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), magnetic 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, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0100] 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 application.

[0101] 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 pressure sensor for transformer bushing arcing test, characterized in that: include: A magnetic isolation cover is used to provide a closed chamber that isolates magnetic field signals; A high-frequency pressure sensor is installed in the sealed chamber; An insulating pressure-resistant tube, wherein the first end of the insulating pressure-resistant tube is mechanically connected to the magnetic isolation cover, the second end of the insulating pressure-resistant tube is mechanically connected to the pressure test point of the transformer bushing, and the insulating pressure-resistant tube has a pressure-leading hole connecting the transformer bushing and the high-frequency pressure sensor; A data transmission line is electrically connected to the high-frequency pressure sensor.

2. The transformer bushing arcing test dedicated pressure sensor according to claim 1, characterized in that: Also includes: A spiral water-cooling heat dissipation structure is arranged around the periphery of the high-frequency pressure sensor.

3. The transformer bushing arcing test dedicated pressure sensor according to claim 1, characterized in that: The periphery of the data transmission line is wrapped with a metal shielding hose.

4. The transformer bushing arcing test dedicated pressure sensor according to claim 1, characterized in that: The first end of the insulating pressure-resistant tube has a mounting thread, and the mounting thread matches the mounting screw hole of the pressure test point of the transformer bushing.

5. A transformer bushing arcing test method, characterized in that: Applied to a transformer bushing arcing test system, the system comprising a plurality of transformer bushing arcing test dedicated pressure sensors according to any one of claims 1 to 4, the method comprising: Acquire the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing; The arcing test result of the transformer bushing is determined according to the arc pressure wave transmission path and the pressure values ​​of the plurality of pressure test points.

6. The transformer bushing arcing test method according to claim 5, characterized in that: Before the step of obtaining the arc pressure wave transmission path, the method includes: According to the internal structure of the transformer bushing, the shortest oil path between the arc occurrence point of the transformer bushing and the pressure relief valve of the transformer bushing is determined, and the shortest oil path is determined as the arc pressure wave transmission path.

7. The transformer bushing arcing test method according to claim 5, characterized in that: After the step of obtaining the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing, and before the step of determining the arcing test result of the transformer bushing according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points, the step further includes: Obtaining pressure compensation parameters corresponding to the plurality of pressure test points; The pressure value of the corresponding pressure test point is corrected according to the pressure compensation parameter.

8. The transformer bushing arcing test method according to claim 5, characterized in that: After the step of obtaining the arc pressure wave transmission path of the transformer bushing and the pressure values ​​of multiple pressure test points of the transformer bushing, and before the step of determining the transformer bushing arcing test result according to the arc pressure wave transmission path and the pressure values ​​of multiple pressure test points, the step further includes: Acquire the temperature of the transformer bushing and a pressure compensation parameter corresponding to the temperature; The pressure values ​​of the plurality of pressure test points are corrected according to the pressure compensation parameter.

9. A transformer bushing arcing test system, characterized in that: The system comprises: A plurality of pressure sensors for transformer bushing arcing test according to any one of claims 1 to 4; A computer device is electrically connected to the data transmission line of the transformer bushing arcing test dedicated pressure sensor, and is used to execute the transformer bushing arcing test method as described in any one of claims 5 to 8.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 5 to 8 are implemented.

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