Transformer oil tank mechanical strength testing device capable of controlling electric explosion
By designing a controllable electric explosion transformer tank mechanical strength testing device, the phenomenon of electric arc discharge inside the transformer is simulated, which solves the problem of insufficient testing accuracy in the existing technology and realizes high-precision transformer tank mechanical strength assessment and structural optimization.
Patent Information
- Application Number
- CN202510959628.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2025-11-21
AI Technical Summary
Existing technologies cannot accurately simulate the transient pressure changes during arc discharge inside a transformer, resulting in insufficient accuracy and reliability in transformer tank mechanical strength testing and an inability to effectively assess the transformer's explosion-proof performance.
A controllable electric explosion transformer tank mechanical strength testing device was designed, including a high-voltage pulse forming circuit, an arc discharge forming module, a measurement module, a defect detection module, and an intelligent control module. By simulating various arc discharge faults, it collects electrical and physical signals, detects tank structural damage, and optimizes the transformer tank structure.
It significantly improves the accuracy and reliability of transformer arc discharge testing, can realistically reproduce transient pressure changes, provides simulation of electric explosion faults in multiple scenarios and intensities, enhances the applicability and accuracy of the system, and supports the optimization of transformer tank structure.
Smart Images
Figure CN120992386A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of transformers, and more particularly, to a controllable electric explosion transformer tank mechanical strength testing device. BACKGROUND
[0002] As the core equipment of the power system, the transformer plays an irreplaceable role in the process of electric energy transmission and distribution. It realizes efficient voltage transformation, not only guarantees the energy transmission between different voltage level power grids, but also significantly improves the stability and economic operation level of the power system. Among various types of transformer faults, the electric arc discharge fault caused by internal short circuit is considered the most serious fault mode due to its strong destructive and rapid development. Research shows that when an electric arc fault occurs inside the transformer, the instantaneous ultra-high temperature arc (up to more than 20000K) will cause the severe cracking of the insulating oil, generating a large amount of combustible gas mixture such as hydrogen and methane. This process is accompanied by extremely high energy release rate, which can cause the pressure at the fault point to increase to tens of atmospheres in milliseconds. Due to the sealed nature of the transformer tank, the pressure wave is reflected and superimposed multiple times in the limited space, forming a complex dynamic mechanical stress field. When the local stress exceeds the material yield limit, it will lead to structural failure of the tank, and then cause the explosion of the oil-gas mixture. Such accidents are often accompanied by fire risk and environmental hazards, highlighting the importance and urgency of the research on the explosion resistance of the transformer.
[0003] At present, the electric arc fault simulation test of transformer oil mostly adopts the fixed electrode method, which has poor adjustability, can simulate few types of electric arc faults, and cannot comprehensively and truly simulate the transient pressure change when the electric arc discharge occurs inside the transformer. It fails to fully reflect the real impact of the electric arc discharge process inside the transformer on the mechanical strength of the tank. SUMMARY
[0004] In view of the deficiencies of the prior art, the present application provides a controllable electric explosion transformer tank mechanical strength testing device.
[0005] According to one aspect of the present application, a controllable electric explosion transformer tank mechanical strength testing device is provided, comprising: a high-voltage pulse forming circuit, an electric arc discharge forming module, a measurement module, a defect detection module and an intelligent control module, wherein
[0006] The high-voltage pulse forming circuit is connected with the electrodes in the arc discharge forming module to form high-voltage pulses on the load between the electrodes; the arc discharge forming module is used to simulate different forms of arc discharge faults in cooperation with the high-voltage pulses; the measuring module is used to collect electrical signals and physical signals during the test and feed back to the intelligent control module; the defect detection module is used to detect whether the transformer oil tank structure is damaged and the damage degree after the simulated discharge; and the intelligent control module is used to coordinate and control the modules and optimize the transformer oil tank structure and the system itself.
[0007] Optionally, the high-voltage pulse forming circuit comprises a plurality of capacitance groups, a plurality of inductance groups, a charging machine, a thyristor and a silicon stack, wherein
[0008] The charging machine is connected with the intelligent control module and the plurality of capacitance groups and the plurality of inductance groups, and the charging voltage, the capacitance incorporation and the inductance switching are controlled through the intelligent control module;
[0009] The trigger circuit is connected with the intelligent control module, and the thyristor triggering is controlled through the intelligent control module;
[0010] The thyristor and the silicon stack are connected to form high-voltage pulses.
[0011] Optionally, the arc discharge forming module comprises an automatic adjusting device, an upper electrode and a lower electrode, wherein
[0012] The automatic adjusting device adjusts the distance between the upper electrode and the lower electrode by adjusting the length of the connecting lead of the upper electrode, and adjusts the load form by adjusting the length of the metal wire extending upward from the lower electrode;
[0013] The upper electrode and the lower electrode are respectively connected with the high-voltage pulse forming circuit to form high-voltage pulses on the load between the upper electrode and the lower electrode.
[0014] Optionally, the load comprises a full metal wire load, a half metal wire load and a pure liquid load, when the metal wire extending upward from the lower electrode touches the upper electrode, the load is the full metal wire load; when the metal wire extending upward from the lower electrode does not touch the upper electrode and there is a certain distance, the load is the half metal wire load; when the lower electrode does not extend the metal wire upward, the load is the pure liquid load, wherein
[0015] The metal wire load simulates the arc fault caused by lightning overvoltage and operating overvoltage; the half metal wire load simulates the arc fault caused by loose contact parts, metal foreign matters or loose parts in the oil tank; and the pure liquid load simulates the arc fault caused by material aging, metal wear and oil pollution.
[0016] Optionally, the arc discharge forming module further comprises an automatic wire replacement device for adjusting the electrode spacing and the load form between the electrodes; and automatically replacing the wire arranged between the two electrodes after each wire electric explosion is completed.
[0017] Optionally, the measuring module measures the voltage signal through a voltage divider, measures the current signal through a Rogowski coil, and measures the pressure signal through a pressure probe array, wherein
[0018] The pressure probe array is arranged at a position equidistant from the electric explosion shock wave source or at a position of a weak structure and a key position of the transformer oil tank.
[0019] Optionally, the defect detection module performs laser scanning on the transformer oil tank shell through a laser sensor and a rotating platform to obtain a deformation variable and determine whether the transformer oil tank shell is damaged.
[0020] Optionally, the intelligent control module controls the simulated arc fault form and intensity by coordinating the high-voltage pulse generated by the high-voltage pulse forming loop and the electrode spacing and load form of the arc discharge forming module, wherein
[0021] The intelligent control module adjusts the parameters of the high-voltage pulse forming loop according to the following:
[0022]
[0023] In the formula, L is the inductance of the main loop; C is the capacitance of the main loop; R is the equivalent resistance of the main loop; I is the discharge current; and t is the time.
[0024] Optionally, the intelligent control module is further configured to comprehensively evaluate the structure of the measured transformer according to the measured pressure data at the weak structure and the key position of the transformer oil tank, in combination with the structural parameters, the deformation variable, the simulated arc discharge type and the position of the measured position of the transformer; and
[0025] The intelligent control module is further configured to intelligently optimize the parameters of the high-voltage pulse forming loop and the arc discharge forming module by importing the pressure data of the actual arc fault.
[0026] Therefore, the present application provides a controllable electric explosion transformer oil tank mechanical strength test method and a topology optimization device. The present application can simulate various arc discharge phenomena under actual operating conditions of the transformer, truly restore the transient pressure change, and significantly improve the accuracy, authenticity and reliability of the transformer arc discharge test. BRIEF DESCRIPTION OF DRAWINGS
[0027] The exemplary embodiments of the present application can be more completely understood by referring to the following drawings:
[0028] Figure 1is a block schematic diagram of a controllable electric explosion transformer oil tank mechanical strength testing device provided by an exemplary embodiment of the present application;
[0029] Figure 2 is a structural schematic diagram of a controllable electric explosion transformer oil tank mechanical strength testing device provided by an exemplary embodiment of the present application;
[0030] Figure 3 is a high-voltage pulse forming circuit diagram provided by an exemplary embodiment of the present application;
[0031] Figure 4 is a schematic diagram of different load forms provided by an exemplary embodiment of the present application;
[0032] Figure 5 is a pressure wave pattern schematic diagram of an arc fault simulation under a full-metal wire load provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION
[0033] Hereinafter, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part but not all of the embodiments of the present application, and thus the present application should not be limited to the described embodiments.
[0034] It should be noted that: unless otherwise specifically stated, the relative arrangement, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
[0035] Those skilled in the art can understand that the terms "first", "second" and the like in the embodiments of the present application are only used to distinguish different steps, devices or modules, and do not represent any specific technical meaning, nor do they represent the inevitable logical sequence between them.
[0036] It should also be understood that in the embodiments of the present application, "a plurality of" can mean two or more, and "at least one" can mean one, two or more.
[0037] It should also be understood that for any component, data or structure mentioned in the embodiments of the present application, unless specifically limited or given the opposite implication by the context, it can be understood as one or more in general.
[0038] In addition, the term "and / or" in the present application is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.
[0039] It should also be appreciated that the description of various embodiments of the present application emphasize differences over the various embodiments, and that the same or similar features can be incorporated into one or more aspects of the application, and that the description can not always repeat itself to avoid obscuring the novelty of the present application.
[0040] It should be understood, however, that the dimensions of the various parts shown in the drawings are chosen for convenience only and not necessarily to scale.
[0041] The following description of at least one example embodiment is merely exemplary in nature and is in no way intended to limit the application or its application or uses.
[0042] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification.
[0043] It is to be noted that like-identified elements in various drawings are denoted with like reference numerals, and that different drawing figures can not necessarily be drawn to scale.
[0044] Figure 1 is a schematic diagram of a controllable electric explosion transformer tank mechanical strength test device provided by an example embodiment of the present application. The controllable electric explosion transformer tank mechanical strength test device comprises a high-voltage pulse forming loop, an electric arc discharge forming module, a measurement module, a defect detection module, and an intelligent control module, wherein
[0045] The high-voltage pulse forming loop connects the electrodes in the electric arc discharge forming module to form a high-voltage pulse acting on the load between the electrodes; the electric arc discharge forming module is used to simulate different forms of electric arc discharge faults in cooperation with the high-voltage pulse; the measurement module is used to collect electrical signals and physical signals during testing and feed back to the intelligent control module; the defect detection module is used to detect whether the transformer tank structure is damaged and the extent of the damage after simulated discharge; and the intelligent control module is used to coordinate and control each module and optimize the transformer tank structure and the system itself.
[0046] Specifically, to solve the problems in the prior art, the purpose of the present application is to provide a controllable electric explosion transformer tank mechanical strength test method and topology optimization device. The present application can simulate various electric arc discharge phenomena under actual operating conditions of the transformer, truly restore the transient pressure change, and significantly improve the accuracy, authenticity, and reliability of the transformer electric arc discharge test.
[0047] To achieve the above-mentioned purpose, the present application provides a controllable electric explosion transformer tank mechanical strength test method and topology optimization device, which refers to Figure 1 and Figure 2As shown, it comprises: a high-voltage pulse forming circuit, an arc discharge forming module, a measurement module, a defect detection module, and an intelligent control module.
[0048] The high-voltage pulse forming circuit is connected to the electrodes in the arc discharge forming module to form a high-voltage pulse on the load between the electrodes; the arc discharge forming module is used to simulate different forms of arc discharge faults in cooperation with the high-voltage pulse; the measurement module is used to collect electrical signals and physical signals during testing and feed back to the intelligent control module; the defect detection module is used to detect whether the transformer oil tank structure is damaged and the extent of the damage after simulation of discharge. The intelligent control module is used to coordinate and control each module and optimize the transformer oil tank structure and the system itself.
[0049] Further, as shown in Figure 3 The high-voltage pulse forming circuit contains a multi-capacitance capacitor group, a multi-inductance inductor group, a charging machine, a thyristor, and a silicon stack. After receiving the signal from the intelligent control module, the capacitance, inductance, and charging voltage parameters can be automatically adjusted and controlled to regulate the amplitude, pulse width, and rising edge of the output high-voltage pulse.
[0050] Specifically, when the capacitance is 2.1 mF, the inductance is 25 μH, and the charging voltage output by the charging machine is 7.5 kV, the pulse current amplitude is 60 kA, the pulse width is 5 ms, and the rising edge is 1 μs.
[0051] The charging machine and the arc discharge forming module are connected to the intelligent control module, which comprehensively controls the two modules to form the required different types and intensities of arc fault simulation. The arc discharge forming module is located in the transformer oil tank; the defect detection module is located near the measurement point outside the transformer oil tank; the measurement module is connected to the high-voltage forming circuit, the arc discharge forming module, and the transformer oil tank to obtain the current, voltage, and pressure models; the defect detection module and the measurement module are connected to the intelligent control module to send the obtained defect parameters and electrical parameters to the intelligent control module for processing and analysis.
[0052] Further, the arc discharge forming module mainly consists of an automatic adjustment device and electrodes, which can simulate a variety of arc discharge faults in cooperation with the high-voltage pulse according to different load conditions and electrode distances.
[0053] The load conditions can be divided into full metal wire load, half metal wire load, and pure liquid load.
[0054] Further, the arc discharge forming module further contains an automatic wire changing device for adjusting the electrode distance and the load form between the electrodes and automatically replacing the metal wire installed between the two electrodes after each metal wire explosion.
[0055] More specifically, the automatic adjusting device adjusts the distance between the electrodes by adjusting the length of the connecting lead of the upper electrode, and adjusts the load form by adjusting the length of the wire extending upward from the lower electrode.
[0056] More specifically, as shown in Figure 4 , when the wire extending upward from the lower electrode touches the upper electrode, the load is full-wire load; when the wire extending upward from the lower electrode does not touch the upper electrode and has a certain distance, the load is half-wire load; when the lower electrode does not extend the wire upward, the load is pure liquid load.
[0057] Specifically, as shown in Figure 5 , the full-metal load form is used, the wire is a copper wire with a length of 50 mm and a diameter of 0.3 mm, and is used to simulate arc discharge failure caused by lightning overvoltage.
[0058] More specifically, the wire load simulates arc failure caused by lightning overvoltage and operating overvoltage; the half-wire load simulates arc failure caused by loose contact parts, metal foreign matter or loose parts in the oil tank; and the pure liquid load simulates arc failure caused by material aging, metal wear and oil pollution.
[0059] Further, the signals measured by the measurement module include the voltage signal measured by the voltage divider, the current signal measured by the Rogowski coil, and the pressure signal measured by the pressure probe array.
[0060] More specifically, the voltage divider uses Tektronix P6015A, the Rogowski coil uses PEM CWT60, and the pressure probe uses PCB 138A10.
[0061] Further, the pressure sensor array has two arrangement positions. One is arranged equidistantly with the electric explosion shock wave source; and the other is located at weak and critical positions of the transformer oil tank structure.
[0062] More specifically, the weak positions of the transformer oil tank structure are the welding lines of the corner of the tank wall, the joint of the bottom and the side wall, and the position of the sleeve hole. The critical positions are near the transformer winding and near the paperboard.
[0063] Further, the defect detection module obtains the deformation and judges whether it is damaged by laser scanning the transformer oil tank shell through the laser sensor and the rotating platform.
[0064] More specifically, the distance is calculated according to the time consumed and the speed of light when the laser irradiates to the surface of the object and returns, and the three-dimensional coordinates pi=(xi,yi,zi) of the measuring point are calculated by using the angle, to obtain the point cloud data and establish the three-dimensional point cloud model. The three-dimensional point cloud models before and after the arc simulation test are compared, or the deformation or the degree of fragmentation of the transformer oil tank is obtained.
[0065] Further, the intelligent control module controls the simulated arc fault form and intensity by coordinating the high-voltage pulse generated by the high-voltage pulse forming loop, the electrode spacing of the arc discharge forming module, and the load form.
[0066] More specifically, the intelligent control module adjusts the parameters of the high-voltage pulse forming loop according to the following formula:
[0067]
[0068] Wherein: L is the inductance of the main loop; C is the capacitance of the main loop; R is the equivalent resistance of the main loop; I is the discharge current; and t is the time.
[0069] Further, the intelligent control module can comprehensively evaluate the transformer tank structure based on the pressure data measured at the weak points and key points of the transformer tank structure, combined with the structural parameters, deformation variables, simulated arc discharge types, and positions of the measured transformer.
[0070] More specifically, the comprehensive evaluation is performed based on the closeness of the pressure data of the measured point to the limit pressure value, the closeness of the deformation variable to the limit deformation variable, the probability of the simulated arc discharge type occurring in the actual operating condition of the transformer, and the fault type caused by the damage of the point.
[0071] Further, the intelligent control module can intelligently optimize the parameters of the high-voltage pulse forming loop and the arc discharge forming module by importing the pressure data of actual arc faults, thereby improving the accuracy of the simulated arc discharge faults.
[0072] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects:
[0073] 1. Based on the principle of electric explosion, the present application can simulate various arc discharge phenomena under actual operating conditions, truly restore transient pressure changes, and significantly improve the accuracy, authenticity, and reliability of transformer arc discharge testing;
[0074] 2. Based on its own database or external data import, the present application can automatically regulate and control the parameters of the high-voltage pulse loop and the arc discharge forming module, realize multi-scenario and multi-intensity electric explosion fault simulation, and improve the applicability and precision of the system;
[0075] 3. The system can comprehensively evaluate the mechanical strength of the transformer tank based on multi-dimensional indicators such as pressure intensity data, position, deformation variable, and fault type, and can import actual fault data to optimize the simulation parameters, thereby improving the intelligent level of the system and the authenticity of fault simulation;
[0076] 4. The whole test process is fully automated except for initial installation and data import, reducing manual intervention, improving test efficiency, and providing a systematic solution for transformer tank structure optimization to help improve equipment safety and reliability.
[0077] The foregoing description has been presented for the purposes of illustration and description. Furthermore, the description is not intended to limit the embodiments of the application to the forms disclosed herein. Although the above has been discussed with regard to various example aspects and embodiments, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations.
Claims
1. A controllable electric explosion transformer tank mechanical strength testing device, characterized in that, The application relates to a high-voltage pulse forming circuit, an arc discharge forming module, a measuring module, a defect detecting module and an intelligent control module, wherein the high-voltage pulse forming circuit is connected with electrodes in the arc discharge forming module to form a high-voltage pulse on the load between the electrodes; the arc discharge forming module is used for simulating different forms of arc discharge faults in cooperation with the high-voltage pulse; and the measuring module is used for collecting electrical signals and physical signals during testing and feeding back to the intelligent control module. The defect detecting module is used for detecting whether the transformer oil tank structure is damaged and the damage degree after simulation discharge; and the intelligent control module is used for coordinating and controlling the modules and optimizing the transformer oil tank structure and the system. The high-voltage pulse forming circuit comprises a multi-capacitance capacitor group, a multi-inductance inductor group, a charging machine, a thyristor and a silicon stack, wherein 2. The controllably electrically explodible transformer tank mechanical strength testing device of claim 1, wherein, the charging machine is connected with the intelligent control module and the multi-capacitance capacitor group and the multi-inductance inductor group, and the charging voltage is controlled by the intelligent control module to control the capacitor charging and the inductor switching; the trigger circuit is connected with the intelligent control module, and the thyristor is triggered by the intelligent control module; the thyristor and the silicon stack are connected to form a high-voltage pulse. The arc discharge forming module comprises an automatic adjusting device, an upper electrode and a lower electrode, wherein 3. The controllably electrically explodible transformer tank mechanical strength testing device of claim 1, wherein, the automatic adjusting device adjusts the distance between the upper electrode and the lower electrode by adjusting the length of the connecting lead of the upper electrode, and adjusts the load form by adjusting the length of the metal wire extending upwards from the lower electrode; the upper electrode and the lower electrode are respectively connected with the high-voltage pulse forming circuit to form a high-voltage pulse on the load between the upper electrode and the lower electrode. The load comprises a full metal wire load, a half metal wire load and a pure liquid load, wherein 4. The controllably electrically explodible transformer tank mechanical strength testing device of claim 3, wherein, the full metal wire load is formed when the metal wire extending upwards from the lower electrode touches the upper electrode; the half metal wire load is formed when the metal wire extending upwards from the lower electrode does not touch the upper electrode and has a certain distance; and the pure liquid load is formed when the lower electrode does not extend the metal wire upwards. The full metal wire load simulates the arc fault caused by lightning overvoltage and operating overvoltage; the half metal wire load simulates the arc fault caused by the loose part of the contact point, the metal foreign matter in the oil tank or the loosened part; and the pure liquid load simulates the arc fault caused by material aging, metal wear and oil pollution.
5. The controllably electrically explodible transformer tank mechanical strength testing device of claim 3, wherein, The arc discharge forming module further comprises an automatic wire replacing device for adjusting the electrode spacing and the load form between the electrodes, and the metal wire arranged between the two electrodes is automatically replaced after each metal wire explosion.
6. The controllably electrically explodible transformer tank mechanical strength testing device of claim 1, wherein, The measuring module measures the voltage signal through a voltage divider, measures the current signal through a Rogowski coil and measures the pressure signal through a pressure probe array, wherein the pressure probe array is arranged at a position equidistant from the electric explosion shock wave source or at a weak position and a key position of the transformer oil tank structure.
7. The controllably electrically explodible transformer tank mechanical strength testing device of claim 1, wherein, The defect detecting module obtains the deformation amount by laser scanning the transformer oil tank shell through a laser sensor and a rotating platform and judges whether the transformer oil tank shell is damaged.
8. The controllable electrically exploded transformer tank mechanical strength testing device of claim 1, wherein, The intelligent control module controls the simulated arc fault form and intensity by coordinating the high-voltage pulse generated by the high-voltage pulse forming loop and the electrode spacing and load form of the arc discharge forming module; wherein, The basis for the intelligent control module to adjust the high-voltage pulse forming loop parameters is as follows: In the formula, L is the inductance of the main loop; C is the capacitance of the main loop; R is the equivalent resistance of the main loop; I is the discharge current; and t is the time.
9. The controllable electrically exploded transformer tank mechanical strength testing device of claim 1, wherein, The intelligent control module is also used to comprehensively evaluate the measured transformer structure according to the measured pressure data at the weak points and key points of the transformer oil tank structure, in combination with the structure parameters, deformation variables, simulated arc discharge types and positions of the measured position of the transformer; and The intelligent control module is also used to intelligently optimize the parameters of the high-voltage pulse forming loop and the arc discharge forming module by importing the pressure data of actual arc faults.