A transformer electrical fault simulation test device and a test method

Abstract

The present disclosure provides a transformer electrical fault simulation test device and a test method. The device includes a split-type sealed container, a main electrode disposed on the sealed container, one or more discharge devices disposed between the main electrodes, and an electrode switching device. The electrode switching device is used to connect one or more discharge devices to the main electrode, so as to simultaneously simulate one or more electrical faults of the transformer. By providing the electrode switching device, the present disclosure can simultaneously set different discharge devices, simultaneously simulate different types of discharge defects, simultaneously observe and compare and analyze different discharge electrical signals, and can also simulate a single discharge defect, avoiding the cumbersome operation of replacing electrodes when simulating different discharge defects, and playing a certain protective role for the electrodes.

Description

Technical Field

[0001] The present disclosure relates to the technical field of transformers. Specifically, it relates to a transformer electrical fault simulation test device and a test method. Background Art

[0002] The statements in this section merely provide background technical information related to the present disclosure and do not necessarily constitute prior art.

[0003] The power industry is an important basic industry to ensure the development of the national economy, and the safe and stable operation of the power system is the fundamental guarantee for the sustainable development of the national economy. Power transformers are essential equipment for power transmission in the power system. Currently, most large-scale voltage power transformers are oil-immersed. In recent years, with the rapid development of various monitoring sensors and monitoring technologies, transformer comprehensive monitoring devices centered on signal monitoring such as oil chromatography, partial discharge, core current, and vibration are being gradually promoted, and a large amount of multi-dimensional monitoring data has been collected. However, the amount of various monitoring data is large, and the correlation relationships between various monitoring data are not yet clear, resulting in the limitation of transformer condition assessment and fault warning to single monitoring quantities, and the inability to effectively utilize the role of multi-dimensional monitoring quantities.

[0004] In order to obtain the correlation relationships between various monitoring quantities of transformers and study the comprehensive early warning diagnosis method for multi-state quantities of transformers, it is necessary to design and manufacture a set of test devices suitable for simulating discharge defects of transformers.

[0005] The structure of transformer equipment is complex, and the types of fault are diverse, resulting in complex fault signals. During the experiment, in addition to the generation of temperature and discharge signals, problems such as optical signals, sound signals, and vibration of the simulation cavity are inevitably generated. At present, it is difficult for the simulated partial discharge fault signals of transformer equipment to correspond to the actual fault types of transformers, it is difficult to simultaneously measure the partial discharge signals caused by electrical faults under multiple defects, and it is inconvenient to replace samples and electrodes, etc. Summary of the Invention

[0006] To solve the above problems, the present disclosure proposes a transformer electrical fault simulation test device and a test method, which can simultaneously simulate the simulation test experiments of multiple discharge defects of transformers.

[0007] To achieve the above object, the present disclosure adopts the following technical solutions:

[0008] One or more embodiments provide a transformer electrical fault simulation test device, including a split-type sealed container, a main electrode provided on the sealed container, one or more discharge devices provided between the main electrodes, and an electrode on-off device, where the electrode on-off device is used to connect one or more discharge devices to the main electrode to simultaneously simulate one or more electrical faults of the transformer.

[0009] One or more embodiments provide a method for simulating electrical faults in a transformer, including the following steps:

[0010] Select a corresponding discharge electrode according to the fault discharge type of the test transformer;

[0011] Place the discharge electrode in the electrode holder and adjust the distance between the high-voltage electrode and the low-voltage electrode of the discharge electrode;

[0012] Connect the low-voltage terminal terminal on the electrode holder to the grounding electrode of the main electrode;

[0013] Place one or more electrode holders with discharge electrodes on the insulating support part in the split-type sealed container, assemble the split-type sealed container, and adjust the electrode on-off device to be powered on for testing.

[0014] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0015] By setting the electrode on-off device, the present disclosure can simultaneously set different discharge devices, realize the simultaneous simulation of different types of discharge defects, realize the simultaneous observation and comparative analysis of different discharge electrical signals, and can also simulate a single discharge defect, avoiding the cumbersome operation of replacing electrodes when simulating different discharge defects, and playing a certain protective role for the electrodes.

[0016] Advantages of additional aspects of the present disclosure will be partly given in the following description, partly will become apparent from the following description, or will be understood through the practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this disclosure are used to provide a further understanding of the present disclosure. The schematic embodiments and descriptions thereof of the present disclosure are used to explain the present disclosure and do not constitute a limitation to the present disclosure.

[0018] Figure 1 is the front view of the structure of the electrical fault simulation test device according to Embodiment 1 of the present disclosure;

[0019] Figure 2 is the bottom view of the structure of the electrical fault simulation test device according to Embodiment 1 of the present disclosure;

[0020] Figure 3 is the top view of the structure of the electrical fault simulation test device according to Embodiment 1 of the present disclosure;

[0021] Figure 4 is the schematic diagram of the structure of the electrical fault simulation test device according to Embodiment 1 of the present disclosure after setting the discharge device;

[0022] Figure 5It is a schematic structural diagram of directly setting electrodes of the electric fault simulation test device according to Embodiment 1 of the present disclosure;

[0023] Figure 6 It is a schematic structural diagram of the electrode bracket after setting the column-plate discharge electrode according to Embodiment 1 of the present disclosure;

[0024] Figure 7 It is a schematic structural diagram of the electrode bracket after setting the tip discharge electrode according to Embodiment 1 of the present disclosure;

[0025] Figure 8(a) Structure diagram of the column-plate discharge electrode according to Embodiment 1 of the present disclosure;

[0026] Figure 8(b) Structure diagram of the needle-plate surface discharge electrode according to Embodiment 1 of the present disclosure;

[0027] Figure 8(c) Structure diagram of the metal particle electrode according to Embodiment 1 of the present disclosure;

[0028] Figure 8(d) Structure diagram of the floating discharge electrode according to Embodiment 1 of the present disclosure;

[0029] Figure 8(e) Structure diagram of the surface discharge electrode according to Embodiment 1 of the present disclosure;

[0030] Figure 8(f) Structure diagram of the tip discharge electrode according to Embodiment 1 of the present disclosure;

[0031] Among them: 1. Cover plate, 2. Tank body, 3. Pull rod, 4. High-voltage main electrode, 5. Grounding electrode,

[0032] 6. Bolt, 7. Air extraction port, 7-1. Air valve, 8. Oil inlet, 8-1. First oil valve, 9. Oil outlet, 9-1. Second oil valve, 10. Measurement interface, 11. Discharge device, 12. Insulating support part, 13. Low-voltage plate electrode;

[0033] 11-1. Upper cover plate, 11-2. Lower cover plate, 11-3. Fixed screw, 11-4. Low-voltage terminal post, 11-5. Low-voltage electrode, 11-6. Second buckle, 11-7. High-voltage electrode end, 11-8. Discharge electrode, 11-9. Insulating paper, 11-10. Protection electrode. Detailed implementation manners

[0034] The present disclosure will be further described below in conjunction with the drawings and embodiments.

[0035] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. It should be noted that, without conflict, the various embodiments and features in the present disclosure can be combined with each other. The embodiments will be described in detail below with reference to the drawings.

[0037] Embodiment 1

[0038] In the technical solutions disclosed in one or more embodiments, as Figure 1 shown in -8, a transformer electrical fault simulation test device includes a split-type sealed container, a main electrode provided on the sealed container, one or more discharge devices 11 provided between the main electrodes, and an electrode on-off device for connecting one or more discharge devices 11 to the main electrode to simultaneously simulate one or more electrical faults of the transformer.

[0039] In this embodiment, by setting the electrode on-off device, different discharge devices 11 can be set simultaneously to simultaneously simulate different types of discharge defects, observe and compare different discharge electrical signals, and also simulate a single discharge defect, avoiding the cumbersome operation of replacing electrodes when simulating different discharge defects, and playing a certain protective role for the electrodes.

[0040] Optionally, the split-type sealed container includes a cover plate 1 and a tank body 2, and the cover plate 1 and the tank body 2 are detachably connected.

[0041] The structure of the detachable connection can be a threaded connection, a snap connection, etc. For the threaded connection, threaded holes can be provided on the cover plate 1 and connected to the tank body 2 through bolts 6.

[0042] Optionally, the size of the sealed container is set according to the number and size of the discharge devices 11 to be set. In this embodiment, the inner diameter of the cavity of the sealed container is not less than 50 cm, and the height is not less than 60 cm.

[0043] In some embodiments, the electrode on-off device can be provided with an electric structure or a mechanical structure, including a conductive contact and a moving mechanism for moving the conductive contact.

[0044] An achievable structure, where the electrode on-off device is arranged on the wall of the split-type sealed container, including a pull rod 3 and a conductive contact arranged at one end of the pull rod 3. The conductive contact is arranged in the cavity of the sealed container, and the other end of the pull rod 3 is arranged outside the sealed container. The conductive contact moves to the first position to connect the main electrode to the discharge device 11, and the conductive contact moves to the second position to disconnect the main electrode from the discharge device 11.

[0045] One implementation, the conductive contact is electrically connected to the high-voltage end of the main electrode. The end of the conductive contact is set in a groove shape, and the shape of the groove-shaped end is adapted to the high-voltage electrode end of the discharge device.

[0046] The conductive contact can be made of conductive materials such as brass and silver, and the pull rod is made of insulating material to prevent electric shock accidents during the on-off process.

[0047] The electrode on-off device is determined according to the number of discharge devices 11 set as required. In this embodiment, four pull rods are set, and four discharge defect experiments can be carried out simultaneously.

[0048] In this embodiment, the main electrode includes a high-voltage main electrode 4 and a grounding electrode 5 arranged opposite to each other. The high-voltage main electrode 4 is connected to the high-voltage end of the voltage source, and the withstand voltage level of the high-voltage main electrode 4 is higher than 20 KV. The grounding electrode 5 is connected to the ground end of the voltage source.

[0049] The high-voltage main electrode 4 can be set as an upper pole rod movably arranged on the cover plate 1 and connected to the needle electrode of the discharge device 11 in the tank body 2. The grounding electrode 5 includes an electrode plate and a lower pole rod.

[0050] The movably arranged upper pole rod can adjust the distance from the high-voltage end to the low-voltage end, and both the high-voltage end and the low-voltage end can replace the electrodes to simulate different types of electrical faults.

[0051] To achieve sealing, it further includes a first buckle, arranged at the connection between the main electrode and the split-type sealed container, set as a rotary buckle, and the electrode opening on the container is sealed by rotation.

[0052] Optionally, the material of the tank body 2 of the simulation test device can be a transparent insulating material, such as acrylic and insulating materials. The cover plate 1 can be made of polytetrafluoroethylene material.

[0053] Furthermore, it further includes an optical fiber sensor arranged on the wall of the split-type sealed container, used to collect optical signals, sound signals, cavity vibration signals, etc. generated during the discharge process.

[0054] Furthermore, a measurement interface 10 is also arranged on the wall of the split-type sealed container for setting the optical fiber sensor.

[0055] Optionally, the measurement sensor may include a high-frequency partial discharge signal measurement sensor (HFCT). The measurement sensor may be connected through the grounding electrode 5.

[0056] To adjust the air pressure inside the tank body 2, an air extraction port 7 is also provided. The air extraction port 7 is connected to a vacuum pumping device, and an air valve 7-1 is provided on the pipeline of the air extraction port 7. Specifically, a three-way valve can be connected to achieve vacuum pumping and protective gas replacement.

[0057] In this embodiment, the setting of the air extraction port 7 can achieve the operation of evacuating the tank body and balancing the air pressure inside the tank body when taking oil samples.

[0058] Furthermore, an oil inlet 8 and an oil outlet 9 are also included. A first oil valve 8-1 is provided on the oil inlet, and a second oil valve 9-1 is provided on the oil outlet 9. The oil inlet is connected to an oil storage and treatment tank. The oil outlet of the oil storage and treatment tank is hermetically connected to the oil inlet 8 of the tank body 2. The oil valve 9-1 at the bottom of the container is used to take oil samples.

[0059] The connection of the oil inlet 8 to the oil storage and treatment tank draws the treated insulating oil from the oil storage tank into the tank body 2 under negative pressure.

[0060] The oil outlet 9 is used for sampling and discharging waste oil after the experiment. The oil outlet 9 can be set to be concave downward to facilitate the complete discharge of waste oil.

[0061] Optionally, the oil storage and treatment tank may be connected with a pneumatic device, and the transformer oil in the oil storage and treatment tank is pressed into the simulation tank body 2 through the pneumatic device.

[0062] By evacuating the tank body and treating the oil, and then injecting the oil into the tank body in a manner of balancing the air pressure with protective gas, the problems of increased water content and dissolved gas in the oil are solved.

[0063] The discharge device 11 is set as different discharge devices to simulate different discharge types, and can simulate defects such as suspended discharge, internal discharge of oil-paper insulation, breakdown, sliding flashover, and tip discharge.

[0064] In some embodiments, the discharge device is a discharge electrode, and any electrode shown in Figure 8 can be directly placed. A low-voltage plate electrode 13 is directly placed on the grounding electrode 5, and an electrode is directly placed on the low-voltage plate electrode 13.

[0065] In other embodiments, the discharge device 11 may include an electrode support and a discharge electrode 11-8 provided on the electrode support. The electrode support is provided on the grounding electrode of the main electrode.

[0066] Optionally, the needle electrode in the discharge electrode 11-8 used can be 30 mm long and 1 mm in diameter, made of tungsten steel. Before the test, the needle needs to be ground so that the curvature radius of the needle electrode meets the test requirements. Among them, the curvature radius of the needle electrode used in the power frequency breakdown and power frequency oil-paper surface flashover test is 40-60 μm; the needle electrode with a curvature radius of 20-40 μm is used in the power frequency partial discharge test. The plate electrode used at the low-voltage end is made of stainless steel and has a diameter of 70 mm. The split-type airtight container can be evacuated to below 100 Pa and has good sealing performance.

[0067] The discharge device 11 of this embodiment is provided with an electrode support, which can protect the needle electrode from damage during the replacement process and can also finely adjust the distance between the two electrodes to make the discharge process more controllable, solving the problem of difficult electrode replacement after the experiment.

[0068] Furthermore, an insulating support part 12 can be provided inside the split-type airtight container for placing the electrode support.

[0069] A feasible structure, the electrode support, includes an upper cover plate 11-1 and a lower cover plate 11-2. The upper cover plate 11-1 and the lower cover plate 11-2 are connected by a fixing screw 11-3. It also includes a hanging plate hung on the upper cover plate, a low-voltage electrode 11-5 arranged on the hanging plate, and a protection electrode 11-10 covering the periphery of the low-voltage electrode. A high-voltage electrode terminal 11-7 is arranged on the upper cover plate 11-1 opposite to the low-voltage electrode. A discharge electrode 11-8 is arranged between the high-voltage electrode terminal 11-7 and the low-voltage electrode 11-5 according to the discharge type.

[0070] Among them, an insulating paper 11-9 is arranged on the upper end surface of the low-voltage electrode 11-5.

[0071] The electrode support of this embodiment can adjust the distance between the upper cover plate 11-1 and the lower cover plate 11-2 through the fixing screw 11-3.

[0072] In some embodiments, it further includes a low-voltage terminal 11-4. The terminal 11-4 can be arranged on the upper cover plate 11-1, and a wire is connected through the terminal 11-4 to the grounding electrode 5 of the main electrode.

[0073] Feasibly, the high-voltage electrode terminal 11-7 and the discharge electrode 11-8 are connected by a second buckle 11-6.

[0074] This embodiment also sets corresponding discharge electrodes 11-8 for different discharge types. As shown in Fig. 8, where Fig. 8(a) is a column-plate discharge electrode, Fig. 8(b) is a needle-plate surface discharge electrode, Fig. 8(c) is a metal particle electrode, Fig. 8(d) is a suspended discharge electrode, Fig. 8(e) is a surface discharge electrode, and Fig. 8(f) is a tip discharge electrode. The corresponding discharge electrodes can be set on the electrode bracket according to the required discharge type. It can also be directly tested without being placed on the electrode rack. As Figure 5 shown. The advantage of this test is that it can simulate the correspondence between the aging state of oil-paper insulation and fault signals under a single electrical fault type. This embodiment adds an electrode type for simulating insulation defects in transformer windings, which can simulate measurement experiments under conditions such as scratches on the insulation layer, air bubbles in transformer oil, moisture in insulating paper, very small metal particles in the transformer, and sharp metal spikes in the transformer.

[0075] The discharge device of this embodiment is provided with an electrode bracket, which can replace the electrode device at any time to simulate partial discharge experiments under different fault types. The electrode bracket can withdraw the electrode from the tank as a whole and perform electrode replacement operations outside the cavity. At the same time, the distance between the two electrode plates can be easily controlled, which has obvious advantages compared with controlling the distance between the two electrodes inside the cavity.

[0076] For the above device, during the partial discharge test, the partial discharge detection equipment needs to be calibrated first. Connect the upper and lower pole rods of the simulation device in series between the high-voltage terminal and the ground terminal of a non-partial discharge power frequency voltage source, and keep the voltage source closed; connect the standard square wave generator in parallel on both sides of the upper and lower pole rods, turn on the standard square wave generator, and select the 500 pC square wave gear; the partial discharge detection equipment can use the LDS-6 type partial discharge detector of Doble Company. After setting the square wave generator, start the detection software, switch to the calibration mode, select the appropriate attenuation gear, input the standard square wave value and click to calibrate. After calibration, connect the detector to the measurement interface, turn off and remove the standard square wave generator, turn on the voltage source and boost the voltage to the partial discharge inception voltage. After detecting the partial discharge waveform, raise the voltage by 10% and perform partial discharge signal measurement.

[0077] Embodiment 2

[0078] Based on the device of the embodiment, this embodiment provides a method for simulating transformer electrical fault tests, including the following steps:

[0079] Step 1: Select the corresponding discharge electrode according to the fault discharge type of the test transformer;

[0080] Step 2: Set the discharge electrode in the electrode bracket and adjust the distance between the high-voltage electrode and the low-voltage electrode of the discharge electrode;

[0081] Step 3: Connect the low-voltage terminal 11-4 on the electrode support to the ground electrode 5 of the main electrode.

[0082] Step 4: Place one or more electrode supports provided with discharge electrodes on the insulating support part 12 in the split-type sealed container, assemble the split-type sealed container, and adjust the electrode on-off device to be powered on for testing.

[0083] The above are only the preferred embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0084] Although the specific implementation manners of the present disclosure are described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present disclosure. Those skilled in the art should understand that based on the technical solutions of the present disclosure, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present disclosure.

Claims

1. A transformer electrical fault simulation test device, characterized in that: it includes a split-type sealed container, a main electrode arranged on the sealed container, one or more discharge devices arranged between the main electrodes, and an electrode on-off device, and the electrode on-off device is used to connect one or more discharge devices to the main electrode to simultaneously simulate one or more electrical faults of the transformer; the electrode on-off device is arranged on the wall of the split-type sealed container and includes a pull rod and a conductive contact arranged at one end of the pull rod, the conductive contact is arranged in the cavity of the sealed container, the other end of the pull rod is arranged outside the sealed container, the conductive contact moves to the first position to connect the main electrode to the discharge device, and the conductive contact moves to the second position to disconnect the main electrode from the discharge device; alternatively, the conductive contact is electrically connected to the high-voltage end of the main electrode, and the end of the conductive contact is set in a groove shape, and the groove-shaped end is adapted to the shape of the high-voltage electrode end of the discharge device; the electrode on-off device is determined according to the number of discharge devices to be set; it is also provided with an air extraction port, and the air extraction port is connected to a vacuum pumping device; it also includes an oil inlet and an oil outlet, a first oil valve is arranged on the oil inlet, a second oil valve is arranged on the oil outlet, and the oil inlet is connected to an oil storage and treatment tank; the discharge device includes an electrode bracket and a discharge electrode arranged on the electrode bracket, and the electrode bracket is arranged on the grounded electrode in the main electrode; the discharge device is provided with an electrode bracket which can protect the electrode from damage during replacement and can also finely adjust the distance between the two electrodes to make the discharge process more controllable; an insulating support part is also arranged in the split-type sealed container for placing the electrode bracket; the electrode bracket includes an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are connected by fixing screws, a hanging plate is arranged on the upper cover plate, a low-voltage electrode and a protection electrode covering the circumference of the low-voltage electrode are arranged on the hanging plate, a high-voltage electrode end is arranged on the upper cover plate opposite to the low-voltage electrode, and a discharge electrode is arranged between the high-voltage electrode end and the low-voltage electrode according to the discharge type; the split-type sealed container uses a detachable connection structure; the size of the sealed container is set according to the number and size of the discharge devices to be set; different discharge devices are simultaneously arranged in the split-type sealed container by setting an electrode on-off device to simultaneously simulate different types of discharge defects and simultaneously observe different discharge electrical signals.

2. A transformer electrical fault simulation test device according to claim 1, characterized in that: the split-type sealed container includes a detachable connection cover plate and a tank body.

3. A transformer electrical fault simulation test device according to claim 1, characterized in that: the electrode on-off device includes a conductive contact and a moving mechanism for moving the conductive contact.

4. A transformer electrical fault simulation test device according to claim 1, characterized in that: the main electrode includes a high-voltage main electrode and a grounded electrode arranged opposite to each other, the high-voltage main electrode is connected to the high-voltage end of the power supply, and the grounded electrode is grounded; the high-voltage main electrode is a movable upper pole rod arranged on the cover plate and is used to connect to the needle electrode of the discharge device in the tank body, and the grounded electrode includes an electrode plate and a lower pole rod.

5. A transformer electrical fault simulation test device as described in claim 1, characterized in that: it further includes an optical fiber sensor disposed on the wall of the split-type sealed container for collecting optical signals, sound signals, and vibration signals generated during the discharge process.

6. A transformer electrical fault simulation test method, characterized in that, it includes the following steps: select a corresponding discharge electrode according to the fault discharge type of the test transformer; dispose the discharge electrode in the electrode support, and adjust the distance between the high-voltage electrode and the low-voltage electrode of the discharge electrode; connect the low-voltage terminal terminal on the electrode support to the grounding electrode of the main electrode; place one or more electrode supports provided with discharge electrodes on the insulating support part inside the split-type sealed container, assemble the split-type sealed container, and adjust the electrode on-off device to be powered on for testing; the electrode on-off device is disposed on the wall of the split-type sealed container and includes a pull rod and a conductive contact disposed at one end of the pull rod. The conductive contact is disposed in the cavity of the sealed container, and the other end of the pull rod is disposed outside the sealed container. The conductive contact moves to the first position to connect the main electrode to the discharge device, and the conductive contact moves to the second position to disconnect the main electrode from the discharge device; or, the conductive contact is electrically connected to the high-voltage end of the main electrode, and the end of the conductive contact is provided in a groove shape, and the groove-shaped end is adapted to the shape of the high-voltage electrode end of the discharge device; a gas extraction port is further provided, and the gas extraction port is connected to a vacuum pumping device; it further includes an oil inlet and an oil outlet. A first oil valve is provided on the oil inlet, a second oil valve is provided on the oil outlet, and the oil inlet is connected to an oil storage and treatment tank; the discharge device includes an electrode support and a discharge electrode disposed on the electrode support. The electrode support is disposed on the grounding electrode in the main electrode; the discharge device is provided with an electrode support that can protect the electrode from damage during replacement and can also finely adjust the distance between the two electrodes to make the discharge process more controllable; an insulating support part is further disposed inside the split-type sealed container for placing the electrode support; the electrode support includes an upper cover plate and a lower cover plate. The upper cover plate and the lower cover plate are connected by fixing screws. A hanging plate is provided on the upper cover plate. A low-voltage electrode and a protective electrode covering the circumference of the low-voltage electrode are provided on the hanging plate. A high-voltage electrode end is provided on the upper cover plate opposite to the low-voltage electrode, and a discharge electrode is provided between the high-voltage electrode end and the low-voltage electrode according to the discharge type; the split-type sealed container uses a detachable connection structure; the size of the sealed container is set according to the number and size of the discharge devices to be provided; different discharge devices are simultaneously provided in the split-type sealed container by setting an electrode on-off device to simultaneously simulate different types of discharge defects and simultaneously observe different discharge electrical signals.

7. A transformer electrical fault simulation test method as described in claim 6, characterized in that: the split-type sealed container includes a detachable connection cover plate and a tank body.

8. A transformer electrical fault simulation test method as described in claim 6, characterized in that: the electrode on-off device includes a conductive contact and a moving mechanism for moving the conductive contact.

9. A transformer electrical fault simulation test method as described in claim 6, characterized in that: The main electrodes include a high-voltage main electrode and a grounding electrode which are oppositely arranged. The high-voltage main electrode is connected to the high-voltage end of the power supply, and the grounding electrode is grounded. The high-voltage main electrode is an upper pole rod movably arranged on the cover plate and is used to be connected to the needle electrode of the discharge device in the tank body. The grounding electrode includes an electrode plate and a lower pole rod.

10. A transformer electrical fault simulation test method according to claim 6, characterized in that: It further includes an optical fiber sensor arranged on the wall of the split-type closed container, which is used to collect optical signals, sound signals and vibration signals generated during the discharge process.

Images