Vibration application device for electromechanical combined testing of transformer oil-paper insulation model

Abstract

This utility model relates to the field of transformer technology, specifically to a vibration application device for electromechanical combined testing of a transformer oil-paper insulation model. The vibration application device includes: an electrical stress application module electrically connected to the high-voltage electrode of the oil-paper insulation model to apply electrical stress to the high-voltage electrode; and a mechanical vibration application module connected to the high-voltage electrode or ground electrode of the oil-paper insulation model to apply mechanical vibration to the high-voltage electrode or ground electrode. The mechanical vibration application module includes a vibration table, an insulating support frame, a fixing component, and a vibration transmission component. The vibration transmission component is connected to a first mounting hole or a second mounting hole to transmit the output of the vibration table to the high-voltage electrode or ground electrode of the oil-paper insulation model. The fixing component passes through the insulating support frame and is connected to the first mounting hole or the second mounting hole to fix the oil-paper insulation model on the insulating support frame and support the oil-paper insulation model through the insulating support frame.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a vibration application device for electromechanical combined testing of transformer oil-paper insulation models. Background Technology

[0002] In power systems, transformers, as core equipment for power transmission and distribution, directly determine the safety and stability of the power grid through their operational reliability. Oil-paper composite insulation, with its excellent dielectric properties and mechanical strength, has become the mainstream structural form for transformer internal insulation systems. However, under actual transformer operating conditions, the Lorentz force generated by the winding current and the magnetostrictive effect of the core can induce continuous mechanical vibration. Simultaneously, the operating voltage also generates electrical stress, which continuously acts on the oil-paper insulation material. This combined electromechanical effect in transformers easily leads to faults such as partial discharge and dielectric aging in the oil-paper insulation structure, seriously threatening the transformer's service life and operational safety.

[0003] Currently, most testing devices for the insulation performance of insulating paper can only simulate electrical stress or mechanical vibration loads individually, making it difficult to accurately reproduce the impact of the complex electromechanical coupling conditions during actual transformer operation on the insulating paper. Furthermore, existing testing devices require separate vibration application devices for different loading directions and vibration modes, resulting in poor flexibility and adaptability, and wasting resources. Therefore, the test results obtained from vibration application tests on insulating paper using existing technology suffer from poor accuracy, reliability, flexibility, and adaptability. Utility Model Content

[0004] To address the technical problems of poor accuracy, reliability, flexibility, and adaptability of test results from vibration-applied testing devices on insulating oil paper, the present invention aims to provide a vibration application device for electromechanical combined testing of transformer oil paper insulation models. The specific technical solution adopted is as follows:

[0005] In a first aspect, this utility model discloses a vibration application device for electromechanical combined testing of a transformer oil-paper insulation model. The vibration application device is used to simultaneously apply electrical stress and mechanical vibration to the oil-paper insulation model. The oil-paper insulation model includes: a high-voltage electrode, a ground electrode, a shell, and insulating paperboard. The insulating paperboard is disposed inside the shell, and oil-paper insulation is formed by dripping insulating oil onto the insulating paperboard. A first mounting hole is provided at the center of the high-voltage electrode, and a second mounting hole is provided at the center of the ground electrode. The vibration application device includes: an electrical stress application module electrically connected to the high-voltage electrode of the oil-paper insulation model to apply electrical stress to the high-voltage electrode; and a mechanical vibration application module. The mechanical vibration application module is connected to the high-voltage electrode or ground electrode of the oil-paper insulation model to apply mechanical vibration to the high-voltage electrode or ground electrode of the oil-paper insulation model. The mechanical vibration application module includes a vibration table, an insulating support frame, a fixing component, and a vibration transmission component. The vibration transmission component is connected to a first mounting hole or a second mounting hole to transmit the output of the vibration table to the high-voltage electrode or ground electrode of the oil-paper insulation model. The fixing component passes through the insulating support frame and is connected to the first mounting hole or the second mounting hole to fix the oil-paper insulation model on the insulating support frame and support the oil-paper insulation model through the insulating support frame. The vibration table has an angle adjustment mechanism to adjust the vibration loading direction and the applied electrode output by the vibration table to the oil-paper insulation model.

[0006] Optionally, the electrical stress application module includes: an experimental transformer, a voltage divider, and a protective resistor. The output terminal of the experimental transformer is connected to the voltage divider, and the voltage divider is connected to the protective resistor. The experimental transformer adjusts the voltage amplitude of the input power supply to obtain an AC voltage signal, and applies the AC voltage signal to the oil-paper insulation model through the voltage divider and the protective resistor.

[0007] Optionally, the vibration table includes an exciter and a power amplifier, with the exciter connected to the power amplifier to adjust the vibration amplitude and / or vibration frequency output by the exciter.

[0008] Optionally, the insulating support frame includes at least one support rod, and the support rods are combined and fixed together according to the vibration loading direction output by the vibration table to the oil-paper insulation model to form the insulating support frame.

[0009] The insulating support frame includes a first support frame, a second support frame, and a third support frame; the first support frame is a semi-enclosed rectangular support frame formed by combining and fixing three support rods, the second support frame is a fully enclosed rectangular support frame formed by combining and fixing four support rods, and the third support frame is a support frame formed by a single support rod.

[0010] Optionally, when the vibration loading direction output by the vibration table to the oil-paper insulation model is perpendicular to the ground and the applied electrode is a high-voltage electrode, the insulation support frame includes a first support frame and a second support frame. The first support frame is fixed below the ground electrode to support the oil-paper insulation model. The output part of the vibration table is connected to one end of the second support frame through a vibration transmission component. The fixing component passes through the other end of the second support frame and the first mounting hole of the high-voltage electrode of the oil-paper insulation model to fix the second support frame to the high-voltage electrode of the oil-paper insulation model. The vibration table outputs a vibration signal to the insulation support frame and applies it to the high-voltage electrode through the vibration transmission component, the second support frame, and the fixing component.

[0011] Optionally, when the vibration loading direction output by the vibration table to the oil-paper insulation model is perpendicular to the ground and the applied electrode is the ground electrode, the insulation support frame includes a second support frame, the vibration transmission component fixes the output part of the vibration table to the second mounting hole of the ground electrode so as to apply the vibration signal output by the vibration table to the ground electrode, and the fixing component passes through the other end of the second support frame and connects to the first mounting hole of the high voltage electrode of the oil-paper insulation model so as to fix the second support frame to the high voltage electrode of the oil-paper insulation model.

[0012] Optionally, a third mounting hole is provided at one end of the ground electrode in the horizontal direction. The vibration table is rotated 90 degrees by the angle adjustment mechanism of the vibration table to apply a vibration signal with the vibration loading direction parallel to the ground to the ground electrode. When the vibration loading direction output by the vibration table to the oil-paper insulation model is parallel to the ground and the applied electrode is the ground electrode, the insulation support frame includes a second support frame and a third support frame. The third support frame is fixed below the ground electrode to support the oil-paper insulation model. The output part of the vibration table is connected to the third mounting hole at one end of the ground electrode in the horizontal direction through a vibration transmission component to transmit the vibration signal output by the vibration table to the ground electrode through the vibration transmission component. The fixing component passes through the other end of the second support frame and is connected to the first mounting hole of the high-voltage electrode of the oil-paper insulation model to fix the second support frame to the high-voltage electrode of the oil-paper insulation model.

[0013] Optionally, a fourth mounting hole is provided at one horizontal end of the high-voltage electrode. The vibration table is rotated 90 degrees by the angle adjustment mechanism of the vibration table to apply a vibration signal with the vibration loading direction parallel to the ground to the high-voltage electrode. When the vibration loading direction output by the vibration table to the oil-paper insulation model is parallel to the ground and the applied electrode is the high-voltage electrode, the insulation support frame includes a third support frame. The third support frame is set below the ground electrode to support the oil-paper insulation model. The output part of the vibration table is connected to the fourth mounting hole at one horizontal end of the high-voltage electrode through a vibration transmission component to transmit the vibration signal output by the vibration table to the high-voltage electrode through the vibration transmission component.

[0014] Optionally, the angle adjustment mechanism includes: a first support component, the upper end of which is provided with a hole-like structure; a second support component, including a bearing base and a connecting component, the two ends of which are respectively vertically arranged with the first support component, and the connecting component is adapted to the hole-like structure; a vibration table is mounted between the two vertically arranged first support components of the second support component and connected to the vibration table through the connecting component, and the vibration table can rotate relative to the first support component and the second support component to adjust the angle of the vibration table.

[0015] The technical solution disclosed in this utility model embodiment can simultaneously apply electrical stress and mechanical vibration to the oil-paper insulation model, closely mimicking the complex electromechanical coupling conditions in actual transformer operation. This solves the problem that existing test devices can only simulate electrical stress or mechanical vibration loads individually, failing to accurately reproduce actual operating conditions. This makes vibration testing of the impact on insulating oil paper more consistent with real transformer operating scenarios, improving the authenticity and reliability of test results. The vibration table is equipped with an angle adjustment mechanism, allowing flexible adjustment of the vibration loading direction and application electrodes. There is no need to manufacture separate vibration application devices for different loading directions and vibration modes, solving the problems of poor flexibility and adaptability, and resource waste in existing test devices. The device provided in this utility model embodiment can meet various vibration test requirements for oil-paper insulation models, improving the device's versatility, flexibility, and resource utilization. Furthermore, through the coordinated application of the electrical stress application module and the mechanical vibration application module, and with the help of the insulation support frame, fixed components, and vibration transmission components, the device precisely acts on the oil-paper insulation model, making the test conditions controllable and the application stable. This ensures the acquisition of reliable insulating oil paper performance test data and helps analyze the performance changes of insulating oil paper under electromechanical coupling conditions in transformers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an oil-paper insulation model provided for an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of a vibration application device provided in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of an electrical stress application module provided in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of a mechanical vibration application module provided in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of an angle adjustment mechanism provided in an embodiment of the present utility model.

[0021] In the figure: oil paper insulation model 10, high voltage electrode 101, ground electrode 102, shell 103, insulating cardboard 104, vibration application device 20, electrical stress application module 201, mechanical vibration application module 202, vibration table 2021, insulating support frame 2022, fixing component 2023, vibration transmission component 2024, angle adjustment mechanism 2025, first support component 2026, perforated structure 2027, second support component 2028, bearing base 2029, connecting component 2030, first support frame 20221, second support frame 20222, third support frame 20223, experimental transformer 2010, voltage divider 2011, protective resistor 2012. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a vibration application device for electromechanical combined testing of a transformer oil-paper insulation model according to this utility model. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] The following describes in detail, with reference to the accompanying drawings, a specific scheme for a vibration application device for electromechanical combined testing of a transformer oil-paper insulation model provided by this utility model. The vibration application device simultaneously applies electrical stress and mechanical vibration to the oil-paper insulation model by simulating the actual operating conditions of electromechanical combined testing in a real transformer, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an oil-paper insulation model provided in an embodiment of the present invention. Figure 1 In the model 10, the oil-paper insulation includes a high-voltage electrode 101, a ground electrode 102, a housing 103, and an insulating paperboard 104. The insulating paperboard 104 is disposed inside the housing 103. Insulating oil is dripped onto the insulating paperboard 104 to form oil-paper insulation. A first mounting hole (not shown in the figure) is provided at the center of the high-voltage electrode 101, and a second mounting hole (not shown in the figure) is provided at the center of the ground electrode 102.

[0025] like Figures 2 to 4 As shown, Figure 2 This is a schematic diagram of the structure of a vibration application device provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of an electrical stress application module provided in an embodiment of the present invention. Figure 4This is a structural schematic diagram of a mechanical vibration application module provided for an embodiment of this utility model. Figure 2 As shown, the vibration application device 20 includes: an electrical stress application module 201 and a mechanical vibration application module 202. The electrical stress application module 201 is electrically connected to the high-voltage electrode 101 of the oil-paper insulation model 10 to apply electrical stress to the high-voltage electrode of the oil-paper insulation model; as shown Figure 4 As shown, Figure 4 The diagram illustrates the structure of a mechanical vibration application module with four different vibration loading directions. The mechanical vibration application module 202 is connected to the high-voltage electrode or ground electrode of the oil-paper insulation model 10 to apply mechanical vibration to the high-voltage electrode or ground electrode. The mechanical vibration application module 202 includes a vibration table 2021, an insulating support frame 2022, a fixing component 2023, and a vibration transmission component 2024. The vibration transmission component 2024 is connected to a first mounting hole or a second mounting hole to transmit the output of the vibration table 2021 to the high-voltage electrode 101 or ground electrode 102 of the oil-paper insulation model 10. The fixing component 2023 passes through the insulating support frame and is connected to the first mounting hole or the second mounting hole to fix the oil-paper insulation model 10 onto the insulating support frame 2022 and support the oil-paper insulation model through the insulating support frame. The vibration table 2021 has an angle adjustment mechanism 2025 to adjust the vibration loading direction and the application electrode output by the vibration table 2021 to the oil-paper insulation model 10.

[0026] Specifically, both the first and second mounting holes can be m5 threaded holes. The fixing component 2023 and the vibration transmission component 2024 can be m5 threaded fasteners adapted to the m5 threaded hole structures. The fixing component 2023 and the vibration transmission component 2024 reliably connect the vibration table 2021, the insulating support frame 2022, and the oil-paper insulating model 10, thus transmitting and applying vibration. Furthermore, the vibration transmission component 2024 or the fixing component 2023 at the high-voltage electrode 101 can be a needle-like component or a cylinder, allowing for the replacement of the tip discharge model and the surface discharge model.

[0027] Furthermore, the vibration table 2021, as a vibration source, can output mechanical vibrations of different frequencies and amplitudes. As an optional embodiment of this invention, the vibration table 2021 includes an exciter and a power amplifier. The exciter is connected to the power amplifier to adjust the vibration amplitude and / or vibration frequency output by the exciter. The exciter, as the core component for vibration generation, can be an electromagnetic exciter (such as a moving-coil exciter) or an electric exciter. The exciter internally includes a drive coil, permanent magnet, or excitation winding, generating vibration output through the conversion of electrical energy into mechanical energy. The power amplifier uses a dedicated vibration power amplifier (such as a linear power amplifier or a switching power amplifier) ​​and is connected to the exciter via a signal cable. The power amplifier has an independent power module (supporting AC 220V input) and a cooling system (built-in cooling fan or heat sink), which can amplify the low-power vibration signal output from the control signal source into a high-power drive signal, driving the exciter to generate mechanical vibrations of the required amplitude and frequency. In this way, by adjusting the vibration frequency and amplitude of the exciter through a power amplifier, the vibration conditions during the actual operation of the transformer can be accurately simulated, making the experimental results of the oil-paper insulation model closer to the actual operating conditions of the real transformer, thus improving the accuracy and reliability of the experimental results.

[0028] Furthermore, as an optional embodiment of this utility model, such as Figure 5 As shown, Figure 5This is a schematic diagram of an angle adjustment mechanism provided in an embodiment of the present invention. The angle adjustment mechanism 2025 includes: a first support component 2026, the upper end of which is provided with a hole structure 2027; a second support component 2028, including a bearing base 2029 and a connecting component 2030, the two ends of which are respectively vertically arranged with the first support component 2026, and the connecting component 2030 is adapted to the hole structure 2027; a vibration table 2021 is mounted between the two vertically arranged first support components 2026 of the second support component 2028 and is connected to the first support component 2026 and the vibration table 2021 through the connecting component 2030. The vibration table 2021 can rotate relative to the first support component 2026 and the second support component 2028 to adjust the angle of the vibration table 2021. The connecting component 2030 can be a fastener (such as a screw or stud). When the angle of the vibration table needs to be adjusted, the fastener is adjusted to a movable state, the vibration table is adjusted to the appropriate position, and then the fastener is tightened for positioning. The angle adjustment mechanism 2025 provided in this embodiment can rotate the working surface of the vibration table 2021 from 0° to 90°, thereby applying vibration perpendicular to the ground and vibration parallel to the ground to the high-voltage electrode or ground electrode of the oil-paper insulation model. This satisfies the vibration application requirements of the oil-paper insulation model under different operating conditions, making the test results more consistent with the actual operating conditions of the transformer. In addition, the angle adjustment mechanism allows one vibration application device to meet the needs of multiple operating conditions, making the vibration application device highly adaptable and flexible, and saving resources.

[0029] Furthermore, the insulating support frame 2022 is made of insulating materials (such as epoxy insulation components, etc., which can be selected according to the actual suitable materials) to provide stable support for the oil paper insulating model 10, while avoiding the influence of the electrical stress application and testing due to the conductivity of the support components during the test, thus improving the accuracy of the test results.

[0030] Furthermore, as an optional embodiment of this utility model, the insulating support frame includes at least one support rod. Each support rod is combined and fixed to form the insulating support frame according to the vibration loading direction output by the vibration table to the oil paper insulation model. The insulating support frame includes a first support frame, a second support frame, and a third support frame. The first support frame is a semi-enclosed rectangular support frame formed by combining and fixing three support rods. The second support frame is a fully enclosed rectangular support frame formed by combining and fixing four support rods. The third support frame is a support frame formed by a single support rod.

[0031] Specifically, such as Figure 4 The diagram illustrates the coordination relationship between the insulating support frame and the vibration table under four working conditions provided in this embodiment of the invention. Figure 4As shown, the insulating support frame includes at least one support rod. Each support rod is combined and fixed to form the insulating support frame according to the vibration loading direction output by the vibration table to the oil paper insulation model. The insulating support frame 2022 includes a first support frame 20221, a second support frame 20222, and a third support frame 20223. The first support frame 20221 is a semi-enclosed rectangular support frame formed by combining and fixing three support rods. The second support frame 20222 is a fully enclosed rectangular support frame formed by combining and fixing four support rods. The third support frame 20223 is a support frame formed by a single support rod.

[0032] Specifically, the first support frame 20221 consists of three insulated support rods (which can be made of high-strength, high-insulation materials such as epoxy fiberglass rods) combined with each other and fixed with insulated connectors (such as insulated bolts and adhesives) to form a semi-enclosed rectangular support frame structure, ensuring support stability. The second support frame 20222 uses four insulated support rods (of the same material as the first support frame 20221 to ensure overall insulation and strength consistency), which are combined and fixed (using insulated angle brackets to ensure a firm connection) to form a fully enclosed rectangular support frame. The fully enclosed structure can provide surrounding support for the oil-paper insulation model 10 from all sides. In scenarios where the stability requirements of the insulating oil-paper model are higher (such as high-frequency, large-amplitude vibration tests), it can effectively limit the unexpected displacement of the insulating oil-paper model, improve the overall support rigidity, and provide a more stable support environment for the test. The third support frame 20223 consists of a single... The insulating support rods form a simple support frame. This structure is compact and simple, and can be used as an auxiliary support component. For example, when additional support is needed in certain parts of the oil-paper insulation model 10, or when some simplified test scenarios are carried out (such as rapid debugging, single-direction pre-support verification), it can provide temporary or supplementary support by contacting specific parts of the oil-paper insulation model (such as the bottom of the shell, electrode extension structure, etc.). It can also be flexibly combined with the first support frame 20221 and the second support frame 20222 to create a variety of support schemes according to test requirements, thereby improving the adaptability and flexibility of the entire insulating support frame 2022.

[0033] Furthermore, this utility model embodiment employs one or more of the first support frame 20221, the second support frame 20222, and the third support frame 20223 for four different working conditions. Specifically, according to... Figure 4As illustrated in (a), in an optional embodiment of the present invention, when the vibration loading direction output by the vibration table 2021 to the oil-paper insulation model is perpendicular to the ground and the applied electrode is a high-voltage electrode, the insulation support frame includes a first support frame 20221 and a second support frame 20222. The first support frame 20221 is fixed below the ground electrode to support the oil-paper insulation model. The output part of the vibration table 2021 is connected to one end of the second support frame 20222 through a vibration transmission component. The fixing component 2023 passes through the other end of the second support frame 20222 and the first mounting hole of the high-voltage electrode of the oil-paper insulation model to fix the second support frame 20222 to the high-voltage electrode of the oil-paper insulation model. The vibration table 2021 outputs a vibration signal to the insulation support frame and applies it to the high-voltage electrode through the vibration transmission component, the second support frame 20222 and the fixing component 2023.

[0034] Specifically, in this embodiment of the invention, the vibration table 2021 and the second support frame 20222 are connected by an m5 threaded fastener. The m5 threaded fastener passes through the other end of the second support frame 20222 and the first mounting hole of the high-voltage electrode of the oil-paper insulation model to fix the second support frame 20222 and the high-voltage electrode of the oil-paper insulation model. The vibration is transmitted to the high-voltage electrode of the oil-paper insulation model through the second support frame 20222 and the two m5 threaded fasteners. The vibration direction is perpendicular to the ground. The ground electrode is supported by the first support frame 20221 so that the vibration is only applied to the high-voltage electrode, thereby achieving mechanical isolation between the high-voltage electrode and other parts.

[0035] Furthermore, as an optional embodiment of this utility model, according to Figure 4 As shown in (b), when the vibration loading direction output by the vibration table 2021 to the oil-paper insulation model is perpendicular to the ground and the applied electrode is the ground electrode, the insulation support frame includes a second support frame 20222. The vibration transmission component fixes the output part of the vibration table 2021 to the second mounting hole of the ground electrode so as to apply the vibration signal output by the vibration table 2021 to the ground electrode. The fixing component 2023 passes through the other end of the second support frame 20222 and connects to the first mounting hole of the high voltage electrode of the oil-paper insulation model so as to fix the second support frame 20222 to the high voltage electrode of the oil-paper insulation model.

[0036] Specifically, in this embodiment of the present invention, the vibration transmission component and the fixing component 2023 can be m5 threaded fasteners. The m5 threaded fasteners fix the output part of the vibration table 2021 to the second mounting hole of the ground electrode. The m5 threaded fasteners pass through the other end of the second support frame 20222 and the first mounting hole of the high voltage electrode of the oil paper insulation model to fix the second support frame 20222 to the high voltage electrode of the oil paper insulation model, and transmit the vibration to the ground electrode through the vibration transmission component.

[0037] Furthermore, as an optional embodiment of this utility model, according to Figure 4 As shown in (c), a third mounting hole is provided at one end of the ground electrode in the horizontal direction. The vibration table 2021 is rotated 90 degrees by the angle adjustment mechanism 2025 to apply a vibration signal with the vibration loading direction parallel to the ground to the ground electrode. When the vibration loading direction output by the vibration table 2021 to the oil-paper insulation model is parallel to the ground and the applied electrode is the ground electrode, the insulation support frame includes a second support frame 20222 and a third support frame 20223. The third support frame 20223 is fixed below the ground electrode to support the oil-paper insulation model. The output part of the vibration table 2021 is connected to the third mounting hole at one end of the ground electrode in the horizontal direction through the vibration transmission component to transmit the vibration signal output by the vibration table 2021 to the ground electrode through the vibration transmission component. The fixing component 2023 passes through the other end of the second support frame 20222 and is connected to the first mounting hole of the high voltage electrode of the oil-paper insulation model to fix the second support frame 20222 to the high voltage electrode of the oil-paper insulation model.

[0038] Specifically, in this embodiment of the invention, the connecting component of the angle adjustment mechanism 2025 is first adjusted to an active state. Then, the vibration table 2021 is rotated 90 degrees, and the connecting component is tightened again to ensure it is secure. In this embodiment, the vibration transmission component and the fixing component 2023 can be M5 threaded fasteners. An M5 threaded hole is provided on the side of one horizontal end of the ground electrode. The output part of the vibration table 2021 is fixedly connected to the M5 threaded hole at the horizontal end of the ground electrode via the M5 threaded fastener, transmitting the vibration signal output by the vibration table 2021 to the ground electrode through the vibration transmission component. The M5 threaded fastener, serving as the fixing component 2023, passes through the other end of the second support frame 20222 and the first mounting hole of the high-voltage electrode of the oil-paper insulation model to fix the second support frame 20222 to the high-voltage electrode of the oil-paper insulation model, thus completing the mechanical isolation of the oil-paper insulation model.

[0039] Furthermore, as an optional embodiment of this utility model, according to Figure 4As shown in (d), a fourth mounting hole is provided at one end of the high-voltage electrode in the horizontal direction. The vibration table 2021 is rotated 90 degrees by the angle adjustment mechanism 2025 of the vibration table 2021 to apply a vibration signal with the vibration loading direction parallel to the ground to the high-voltage electrode. When the vibration loading direction output by the vibration table 2021 to the oil paper insulation model is parallel to the ground and the applied electrode is the high-voltage electrode, the insulation support frame includes a third support frame 20223. The third support frame 20223 is set below the ground electrode to support the oil paper insulation model. The output part of the vibration table 2021 is connected to the fourth mounting hole at one end of the high-voltage electrode in the horizontal direction through the vibration transmission component to transmit the vibration signal output by the vibration table 2021 to the high-voltage electrode through the vibration transmission component.

[0040] Specifically, in this embodiment of the invention, the connecting component of the angle adjustment mechanism 2025 is first adjusted to a movable state. Then, the vibration table 2021 is rotated 90 degrees, and the connecting component is tightened again to ensure it is secure. In this embodiment, the vibration transmission component can be an M5 threaded fastener. An M5 threaded hole is provided on the side of one horizontal end of the high-voltage electrode. The output part of the vibration table 2021 is fixedly connected to the M5 threaded hole at the horizontal end of the high-voltage electrode via the M5 threaded fastener, for transmitting the vibration signal output by the vibration table 2021 to the high-voltage electrode through the M5 threaded fastener.

[0041] like Figure 3 As shown, the electrical stress application module 201 includes an experimental transformer 2010, a voltage divider 2011, and a protective resistor 2012. The output terminal of the experimental transformer 2010 is connected to the voltage divider 2011, and the voltage divider 2011 is connected to the protective resistor 2012. The experimental transformer 2010 adjusts the voltage amplitude of the input power supply to obtain an AC voltage signal, and applies the AC voltage signal to the oil-paper insulation model 10 through the voltage divider 2011 and the protective resistor 2012.

[0042] Specifically, the experimental transformer 2010, as the core component for applying electrical stress, is a dedicated high-voltage test transformer with high-voltage output and stable voltage regulation characteristics. Its internal structure includes primary and secondary windings, which regulate the voltage amplitude of the input power supply (usually AC mains power, such as 220V or 380V AC) through electromagnetic induction. The transformer is equipped with a voltage regulating device, such as an electric or manual voltage regulator, enabling continuous voltage adjustment. The output range covers from low to high voltage, providing different levels of AC voltage signals to the oil-paper insulation model 10 to simulate the electrical stress environment under different operating conditions during transformer operation. The voltage divider 2011 uses a high-precision resistive or capacitive voltage divider connected to the output terminal of the experimental transformer 2010. Its main function is to reduce the high voltage output from the experimental transformer by a fixed ratio, ensuring that the output voltage signal is compatible with the range of measuring instruments and control equipment, facilitating accurate measurement and real-time monitoring of the voltage applied to the oil-paper insulation model 10. The voltage divider possesses high stability and linearity, ensuring the accuracy of measurement results with the error range controlled within a very small range. A protective resistor 2012 is connected in series between the voltage divider 2011 and the oil-paper insulation model 10. A resistor with high resistance and high power characteristics (such as a metal oxide film resistor) is selected. Its main function is to limit the current in the circuit during the test. When the oil-paper insulation model 10 experiences abnormal conditions such as insulation breakdown, it rapidly increases the circuit resistance to prevent excessive short-circuit current from damaging the experimental transformer 2010, the voltage divider 2011, and other related equipment, thus protecting the entire electrical stress application module. Furthermore, the protective resistor can also smooth the voltage waveform to a certain extent, reducing the impact of voltage surges on the oil-paper insulation model, making the applied electrical stress more consistent with the changing characteristics of actual operating conditions, and providing a more stable electrical stress environment for the test. Thus, through reasonable connection and coordinated operation, the experimental transformer 2010, voltage divider 2011, and protective resistor 2012 can accurately adjust and control the AC voltage signal applied to the oil-paper insulation model 10, which not only meets the test requirements of electrical stress in the actual operation of the simulated transformer, but also ensures the safety of equipment and personnel during the test, and ensures the reliability and effectiveness of the test results.

[0043] The technical solution disclosed in this utility model embodiment can simultaneously apply electrical stress and mechanical vibration to the oil-paper insulation model, closely mimicking the complex electromechanical coupling conditions in actual transformer operation. This solves the problem that existing test devices can only simulate electrical stress or mechanical vibration loads individually, failing to accurately reproduce actual operating conditions. This makes vibration testing of the impact on insulating oil paper more consistent with real transformer operating scenarios, improving the authenticity and reliability of test results. The vibration table is equipped with an angle adjustment mechanism, allowing flexible adjustment of the vibration loading direction and application electrodes. There is no need to manufacture separate vibration application devices for different loading directions and vibration modes, solving the problems of poor flexibility and adaptability, and resource waste in existing test devices. The device provided in this utility model embodiment can meet various vibration test requirements for oil-paper insulation models, improving the device's versatility, flexibility, and resource utilization. Furthermore, through the coordinated application of the electrical stress application module and the mechanical vibration application module, and with the help of the insulation support frame, fixed components, and vibration transmission components, the device precisely acts on the oil-paper insulation model, making the test conditions controllable and the application stable. This ensures the acquisition of reliable insulating oil paper performance test data and helps analyze the performance changes of insulating oil paper under electromechanical coupling conditions in transformers.

[0044] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0045] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. A vibration application device for electromechanical combined testing of a transformer oil-paper insulation model, characterized in that, The vibration application device simultaneously applies electrical stress and mechanical vibration to the oil-paper insulation model. The oil-paper insulation model includes: a high-voltage electrode, a ground electrode, a shell, and an insulating paperboard. The insulating paperboard is disposed inside the shell. Insulating oil is dripped onto the insulating paperboard to form oil-paper insulation. A first mounting hole is provided at the center of the high-voltage electrode, and a second mounting hole is provided at the center of the ground electrode. The vibration application device includes an electrical stress application module, which is electrically connected to the high-voltage electrode of the oil-paper insulation model to apply electrical stress to the high-voltage electrode of the oil-paper insulation model. A mechanical vibration application module is connected to the high-voltage electrode or ground electrode of the oil-paper insulation model to apply mechanical vibration to the high-voltage electrode or ground electrode of the oil-paper insulation model. The mechanical vibration application module includes a vibration table, an insulating support frame, a fixing component, and a vibration transmission component. The vibration transmission component is connected to the first mounting hole or the second mounting hole to transmit the output of the vibration table to the high-voltage electrode or ground electrode of the oil-paper insulation model. The fixing component passes through the insulating support frame and is connected to the first mounting hole or the second mounting hole to fix the oil-paper insulation model on the insulating support frame and support the oil-paper insulation model through the insulating support frame. The vibration table has an angle adjustment mechanism to adjust the vibration loading direction and the application electrode output by the vibration table to the oil-paper insulation model.

2. The vibration application device for electromechanical combined testing of transformer oil-paper insulation model according to claim 1, characterized in that, The electrical stress application module includes: an experimental transformer, a voltage divider, and a protective resistor. The output terminal of the experimental transformer is connected to the voltage divider, and the voltage divider is connected to the protective resistor. The experimental transformer adjusts the voltage amplitude of the input power supply to obtain an AC voltage signal, and applies the AC voltage signal to the oil-paper insulation model through the voltage divider and the protective resistor.

3. The vibration application device for electromechanical combined testing of transformer oil-paper insulation model according to claim 1, characterized in that, The vibration table includes an exciter and a power amplifier. The exciter is connected to the power amplifier to adjust the vibration amplitude and / or vibration frequency output by the exciter.

4. The vibration application device for electromechanical combined testing of transformer oil-paper insulation model according to claim 1, characterized in that, The insulating support frame includes at least one support rod. The support rods are combined and fixed to each other according to the vibration loading direction output by the vibration table to the oil-paper insulation model to form the insulating support frame. The insulating support frame includes a first support frame, a second support frame, and a third support frame; The first support frame is a semi-enclosed rectangular support frame formed by combining and fixing three support rods together; the second support frame is a fully enclosed rectangular support frame formed by combining and fixing four support rods together; and the third support frame is a support frame formed by a single support rod.

5. The vibration application device for electromechanical combined testing of transformer oil-paper insulation model according to claim 4, characterized in that, When the vibration loading direction output by the vibration table to the oil-paper insulation model is perpendicular to the ground, and the applied electrode is a high-voltage electrode, the insulation support frame includes a first support frame and a second support frame. The first support frame is fixed below the ground electrode to support the oil-paper insulation model. The output part of the vibration table is connected to one end of the second support frame through a vibration transmission component. The fixing component passes through the other end of the second support frame and the first mounting hole of the high-voltage electrode of the oil-paper insulation model to fix the second support frame to the high-voltage electrode of the oil-paper insulation model. The vibration table outputs a vibration signal to the insulation support frame and applies it to the high-voltage electrode through the vibration transmission component, the second support frame, and the fixing component.

6. The vibration application device for electromechanical combined testing of transformer oil-paper insulation model according to claim 4, characterized in that, When the vibration loading direction output by the vibration table to the oil-paper insulation model is perpendicular to the ground and the applied electrode is the ground electrode, the insulation support frame includes a second support frame. The vibration transmission component fixes the output part of the vibration table to the second mounting hole of the ground electrode so as to apply the vibration signal output by the vibration table to the ground electrode. The fixing component passes through the other end of the second support frame and connects to the first mounting hole of the high-voltage electrode of the oil-paper insulation model so as to fix the second support frame to the high-voltage electrode of the oil-paper insulation model.

7. The vibration application device for electromechanical combined testing of transformer oil-paper insulation model according to claim 4, characterized in that, A third mounting hole is provided at one horizontal end of the ground electrode. The vibration table is rotated 90 degrees by the angle adjustment mechanism of the vibration table to apply a vibration signal with the vibration loading direction parallel to the ground to the ground electrode. When the vibration loading direction output by the vibration table to the oil-paper insulation model is parallel to the ground and the applied electrode is the ground electrode, the insulation support frame includes a second support frame and a third support frame. The third support frame is fixed below the ground electrode to support the oil-paper insulation model. The output part of the vibration table is connected to the third mounting hole at one horizontal end of the ground electrode through a vibration transmission component to transmit the vibration signal output by the vibration table to the ground electrode through the vibration transmission component. The fixing component passes through the other end of the second support frame and is connected to the first mounting hole of the high-voltage electrode of the oil-paper insulation model to fix the second support frame to the high-voltage electrode of the oil-paper insulation model.

8. The vibration application device for electromechanical combined testing of transformer oil-paper insulation model according to claim 4, characterized in that, A fourth mounting hole is provided at one horizontal end of the high-voltage electrode. The vibration table is rotated 90 degrees by the angle adjustment mechanism of the vibration table to apply a vibration signal with the vibration loading direction parallel to the ground to the high-voltage electrode. When the vibration loading direction output by the vibration table to the oil-paper insulation model is parallel to the ground and the applied electrode is a high-voltage electrode, the insulation support frame includes a third support frame. The third support frame is set below the ground electrode to support the oil-paper insulation model. The output part of the vibration table is connected to the fourth mounting hole at one horizontal end of the high-voltage electrode through a vibration transmission component to transmit the vibration signal output by the vibration table to the high-voltage electrode through the vibration transmission component.

9. The vibration application device for electromechanical combined testing of transformer oil-paper insulation model according to claim 1, characterized in that, The angle adjustment mechanism includes: A first support component, wherein the upper end of the first support component is provided with a hole-like structure; The second support component includes a bearing base and a connecting component. The first support component is vertically installed at both ends of the bearing base, and the connecting component is adapted to the perforated structure. The vibration table is mounted between two vertically arranged first support components of the second support component and the first support component is connected to the vibration table through the connecting component. The vibration table can rotate relative to the first support component and the second support component to adjust the angle of the vibration table.

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