A device for simulating internal faults of transformers based on air flow aid

Abstract

The present invention discloses a device for simulating internal faults of transformers based on air flow aids, comprising an air compressor, an air flow aid, a cavity, a straight pipe, a curved pipe, a three-way valve and a transformer box, wherein the straight pipe, the curved pipe and the three-way valve are arranged inside the transformer box; the air compressor is connected with the air flow aid, the cavity and one end of the three-way valve in sequence through a pipeline; the other two ends of the three-way valve are connected with the straight pipe and the curved pipe respectively; the air compressor injects compressed air into the air flow aid through the air inlet of the air flow aid, and the pulse electromagnetic valve of the air flow aid is opened after reaching a certain pressure, and the compressed air in the air flow aid is instantly ejected through the nozzle, and the ejected gas passes through the cavity, the three-way valve, and then passes through the straight pipe or the curved pipe to impact the oil flow in the transformer box, so that the oil flow inside the transformer box surges, simulating internal faults of the transformer box. The present invention has reasonable design and simple operation, and can simulate transformer faults under different energies through the air flow aid.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and more specifically relates to a device for simulating internal faults of transformers based on an air flow aid. Background Art

[0002] The relevant test bench design is mainly aimed at simulating the oil flow in the transformer pipeline. These test benches are only designed for the measurement of the light gas action volume of the gas relay and the setting of the heavy gas transient oil flow. At present, there is no corresponding experimental device to simulate the surging oil flow when a fault occurs inside the transformer; it is impossible to determine the surging oil flow caused by faults at different locations and degrees of the transformer; and it is impossible to monitor the flow rate of the surging oil flow in the main pipeline, the rise and decay of the pressure when the transformer box fails in real time.

[0003] Therefore, how to provide a device based on an air flow aid to simulate the occurrence of internal faults in a transformer has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] In view of this, the present invention provides a device for simulating internal fault occurrence of a transformer based on an air flow aid, which has a reasonable design and is easy to operate, and can simulate transformer faults under different energies through an air flow aid.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A device for simulating internal faults of a transformer based on an air flow aid comprises: an air compressor, an air flow aid, a cavity, a straight pipe, a curved pipe, a three-way valve and a transformer case, wherein the straight pipe, the curved pipe and the three-way valve are all arranged inside the transformer case; an air outlet of the air compressor is connected with the air flow aid, the cavity and one end of the three-way valve in sequence through a pipeline; the other two ends of the three-way valve are connected with the straight pipe and the curved pipe respectively; the air compressor injects compressed air into the air flow aid through the air inlet of the air flow aid, and opens the pulse solenoid valve of the air flow aid after a certain pressure is reached, and the compressed air in the air flow aid is instantly ejected through a nozzle, and the ejected gas passes through the cavity and the three-way valve, and then passes through the straight pipe or the curved pipe to impact the oil flow in the transformer case, so that the oil flow inside the transformer case surges, thereby simulating internal faults of the transformer case.

[0007] Furthermore, there are three-phase windings A, B, and C in the transformer box, 6 fault points are evenly set on the A-phase winding, and 4 fault points are evenly set on the B-phase winding. Each three-way valve controls two fault point outlets. By adjusting the three-way valve, any channel of the straight pipe or the curved pipe is opened, and any fault point generates impact airflow, and the oil flow begins to surge, thereby simulating internal faults of the transformer at different positions.

[0008] Furthermore, it also includes a connected main pipeline and an oil pillow; two identical symmetrical outlets are opened on the left and right sides of the top surface of the transformer box. When one set of the main pipeline and the oil pillow is connected to the right side outlet of the transformer box, jet is ejected through the exhaust port of the air flow aid to generate impact airflow at any fault point on the A and B phase windings, simulating faults at different positions in the transformer; when the main pipeline and the oil pillow are connected to the left side outlet of the transformer box, faults are simulated at 6 different fault points of the A winding, and faults are simulated at the fault points B1 and B2 of the B winding, so as to simulate faults at 18 different positions in the transformer box.

[0009] Furthermore, one end of the main pipeline is connected to the outlet of the transformer box through a flange, and the other end is connected to the oil pillow through a bellows.

[0010] Furthermore, a pressure sensor is installed respectively at the left side of the middle height of the A-phase winding facing the front of the transformer box, at the middle position of the B-phase winding facing the front of the transformer box, at the middle height of the left side of the A-phase winding facing the transformer box, and near the left and right sides of the top surface of the transformer box. When a transformer box failure is simulated, the oil flow inside the box begins to surge, and the pressure sensor synchronously measures the pressure curve of key points inside the transformer box during an oil flow surge cycle.

[0011] Furthermore, it also includes a flow rate sensor and a pressure sensor. The flow rate sensor is installed on the main pipeline close to the bellows, and the pressure sensor is installed on the main pipeline in front of the flow rate sensor. When simulating surging oil flows of different energies, the relevant parameters of the flow rate, pressure rise and attenuation in the pipe are measured respectively to extract the characteristic quantities of the surging oil flow.

[0012] Furthermore, a temperature sensor is installed on the top of the transformer box to measure the temperature inside the transformer box when a fault occurs.

[0013] Furthermore, a liquid level meter is installed on the right side wall of the transformer box to monitor the oil height in the box in real time and obtain the oil drop height of the transformer box under different faults.

[0014] Furthermore, pressure sensors and flow rate sensors are installed on two sets of main pipelines with different pipe diameters, and the flow velocity and pressure curves in the main pipelines with different pipe diameters under the same fault are measured.

[0015] The beneficial effects of the present invention are:

[0016] The present invention has reasonable design and is easy to operate. It can simulate transformer faults under different energies through an air flow aid. Through the design of the fault point, fault simulation at different positions inside the transformer can be realized. The characteristic quantity of oil flow surge in the main pipeline when a transformer fails internally can be measured, providing an important basis for improving transformer protection measures in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 It is a front view of the present invention;

[0019] Figure 2 A top view of the present invention;

[0020] Figure 3 The present invention is a schematic diagram of the fault port position set on the A-phase winding and the B-phase winding in the transformer box Figure 1 ;

[0021] Figure 4 The present invention is a schematic diagram of the fault port position set on the A-phase winding and the B-phase winding in the transformer box Figure 2 ;

[0022] Figure 5 This is a schematic diagram of a transformer box fault simulation channel of the present invention;

[0023] Figure 6 is a control flow chart of the air flow aid of the present invention;

[0024] Figure 7 A flow chart of the flow route of the air flow simulating the oil flow surge during the test process of the present invention;

[0025] Figure 8 This is a flow chart of the real-time monitoring sensor of the present invention;

[0026] Fig. 9 It is a structural schematic diagram of the small flange of the present invention;

[0027] Fig.10 It is a structural schematic diagram of the large flange of the present invention;

[0028] Fig.11 It is a schematic diagram of the assembly structure of the small flange and the large flange of the present invention;

[0029] Fig.12 This is a schematic diagram of the main pipeline structure of the present invention with a diameter of 80 mm;

[0030] Fig.13 This is a schematic diagram of the main pipeline structure with a diameter of 50 mm according to the present invention.

[0031] Among them, in the figure,

[0032] 2. Air flow aid, 3. Cavity, 4. Straight pipe, 5. Elbow pipe, 6. Three-way valve, 7. Transformer box, 8. Flange, 9. Main pipeline, 10. Bellows, 11. Oil pillow, 12. Pressure sensor, 13. Flow rate sensor, 14. Temperature sensor, 15. Liquid level meter. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] refer to Figure 1-13 The present invention provides a device for simulating internal faults of a transformer based on an air flow aid, comprising: an air compressor, an air flow aid 2, a cavity 3, a straight pipe 4, a curved pipe 5, a three-way valve 6 and a transformer box 7, wherein the straight pipe 4, the curved pipe 5 and the three-way valve 6 are all arranged inside the transformer box 7; the air outlet of the air compressor is connected with the air flow aid 2, the cavity 3 and one end of the three-way valve 6 in sequence through a pipeline; the other two ends of the three-way valve 6 are respectively connected with the straight pipe 4 and the curved pipe 5; the air compressor injects compressed air into the air flow aid 2 through the air inlet of the air flow aid 2, and opens the pulse solenoid valve of the air flow aid 2 after reaching a certain pressure, and the compressed air in the air flow aid 2 is instantly ejected through the nozzle, and the ejected gas passes through the cavity 3 and the three-way valve 6, and then passes through the straight pipe 4 or the curved pipe 5, impacting the oil flow in the transformer box 7, so that the oil flow inside the transformer box 7 surges, simulating the internal fault of the transformer box 7. During operation, first open the ball valve at the air outlet of the air flow aid 2, and the air compressor 1 pressurizes the cavity of the air flow aid 2. When triggering is required, a pulse electrical signal is given to the pulse solenoid valve of the air flow aid 2, and the air flow aid 2 immediately acts, that is, a strong impact airflow is ejected through the exhaust port of the air flow aid 2, and the airflow impacts the oil flow in the box, and the oil flow surges, simulating the internal fault of the transformer. Among them, only one air flow aid 2 is pressed each time, and the air compressor 1 can pressurize the air pressure of an adjustable value into the cavity of the air flow aid to simulate the internal fault of the transformer under different energies. Similarly, when pressing another air flow aid 2, the operation process is similar.

[0035] In this embodiment, there are three-phase windings A, B, and C in the transformer box 7. Six fault points are evenly set on the A-phase winding, and four fault points are evenly set on the B-phase winding. Each three-way valve 6 controls two fault point outlets. By adjusting the valve of the three-way valve 6, any channel of the straight pipe 4 or the curved pipe 5 is opened, and any fault point generates impact airflow, and the oil flow begins to surge, thereby simulating internal faults of the transformer at different positions.

[0036] In this embodiment, it also includes a main pipeline 9 and an oil pillow 11 that are connected; two identical symmetrical outlets are opened on the left and right sides of the top surface of the transformer box 7. When one set of the main pipeline 9 and the oil pillow 11 is connected to the right outlet of the transformer box 7, the air is sprayed through the exhaust port of the air flow aid 2 to generate impact airflow at any fault point on the A and B phase windings, simulating faults at different positions in the transformer; when the main pipeline 9 and the oil pillow 11 are connected to the left outlet of the transformer box 7, faults are simulated at 6 different fault points of the A phase winding, which is equivalent to simulating faults at 6 positions on the C phase winding when the main pipeline 9 and the oil pillow 11 are partially connected to the right outlet of the box 7; when the pipeline 9 and the oil pillow 11 are connected to the left outlet of the transformer box 7, it is equivalent to simulating faults at the B winding B1 and B2 fault points when the pipeline 9 and the oil pillow 11 are partially connected to the right outlet of the box 7. Achieving symmetry between A and C is equivalent to setting 6 fault points on the A, B, and C phases respectively, so that 18 faults at different positions of the transformer box 7 can be simulated.

[0037] In this embodiment, one end of the main pipeline 9 is connected to the outlet of the transformer box 7 through a flange 8, and the other end is connected to the oil pillow 11 through a bellows 10.

[0038] In this embodiment, a pressure sensor 12 is installed respectively at the left side position of the height of the middle part of the front face of the transformer box 7 where the A-phase winding is facing, at the middle position of the height of the middle part of the front face of the transformer box 7 where the B-phase winding is facing, at the middle height position of the left side face of the transformer box 7 where the A-phase winding is facing, and near the left and right side outlets of the top face of the transformer box 7. When a fault of the transformer box 7 is simulated, the oil flow inside the box begins to surge, and the pressure sensor 12 synchronously measures the pressure curve of the key points inside the transformer box 7 during an oil flow surge cycle, and these positions are used as the key points inside the transformer box 7.

[0039] In this embodiment, a flow rate sensor 13 and a pressure sensor 12 are also included. The flow rate sensor 13 is installed on the main pipeline 9 close to the bellows 10, and the pressure sensor 12 is installed on the main pipeline in front of the flow rate sensor 13. When simulating surging oil flows of different energies, the relevant parameters of the flow rate in the pipe, pressure rise and attenuation are measured respectively to extract the characteristic quantities of the surging oil flow.

[0040] In this embodiment, a temperature sensor 14 is installed on the top of the transformer box 7 to measure the temperature inside the transformer box 7 when a fault occurs.

[0041] In this embodiment, a liquid level meter 15 is installed on the right side wall of the transformer box 7 to monitor the oil level in the box in real time and obtain the oil drop height of the transformer box 7 under different faults.

[0042] In this embodiment, pressure sensors 12 and flow rate sensors 13 are installed on two sets of main pipelines 9 with different diameters to measure the flow rate and pressure curves in the main pipelines 9 with different diameters under the same fault.

[0043] The present invention mainly consists of an air compressor 1, two air flow aids 2, two cavities 3, a straight pipe 4, a curved pipe 5, five three-way valves 6, a transformer box 7, six fault points (A1, A2, A3, A4, A5, A6) arranged on the A-phase winding, four fault points B1, B2, B3, B4 arranged on the B-phase winding, a C-phase winding, two flanges 8, two sets of main pipes with different diameters 9, a bellows 10, an oil pillow 11, six pressure sensors 12, a flow rate sensor 13, a temperature sensor 14, and a liquid level meter 15.

[0044] The present invention now needs to solve several problems: first, how to simulate the internal fault of the transformer box; second, how to simulate the surging oil flow generated in the transformer box under different energy faults; third, how to simulate the surging oil flow generated in the transformer box under different position faults; fourth, how to monitor in real time the oil flow related parameters (temperature, height, key point pressure) in the box and the flow rate, pressure rise and decay of the surging oil flow in the main pipeline when the internal fault of the transformer box occurs. Fifth, how to simply and conveniently switch between two sets of main pipelines with different diameters when designing multiple sets of main pipelines with different diameters.

[0045] The present invention is achieved in the following manner: In response to the first problem, the present invention uses an air flow aid 2 to provide the generating device with an external excitation source required for the test. The air flow aid 2 includes an air storage tank, an air inlet at the bottom, a pulse solenoid valve on the side, and a nozzle connected to the pulse solenoid valve. During operation, the air compressor injects compressed air into the air storage tank through the air inlet of the air flow aid 2. After reaching a certain pressure, the pulse solenoid valve is opened, and the compressed air in the air storage tank is instantly ejected through the nozzle. The ejected gas passes through the cavity 3, the three-way valve 6, the straight pipe 4 or the curved pipe 5, impacting the oil flow of the transformer box, causing the oil flow inside the transformer box 7 to surge, simulating an internal fault of the transformer box 7.

[0046] For the second problem: Use an air compressor to pressurize the cavity of the air flow aid 2. There is an air pressure indicator on the air compressor. The air pressure of the cavity of the air flow aid 2 is the same as the energy required for the fault. The air compressor adjusts the air pressure of different energies to simulate the surging oil flow generated in the transformer box 7 under different energy faults.

[0047] For the third question: Six fault ports (A1, A2, A3, A4, A5, A6) are set on the A-phase winding, and four fault ports (B1, B2, B3, B4) are set on the B-phase winding. The fault ports A1, A3, A5, B1, B3 are connected to five straight pipes 4 respectively, and the fault ports A2, A4, A6, B2, B4 are connected to five curved pipes 5 respectively, which is equivalent to having 10 fault channels. Figure 3 and Figure 4 As shown, the lower end of an air flow aid 2 is connected to a cavity 3, three tubes extend from the lower end of one cavity 3, respectively connected to a three-way valve, and two tubes extend from the lower end of another cavity 3, respectively connected to a three-way valve, one end of the three-way valve 6 is connected to the thin tube of cavity 3, one end is connected to the straight pipe 4, and the other end is connected to the curved pipe 4. By adjusting the valve of the three-way valve 6, any straight pipe 4 channel or curved pipe 5 channel can be connected. During the experiment, only one channel is opened, and the other channels are closed, so that airflow can be ejected from the fault port at any position, simulating the surging oil flow generated in the transformer box 7 under faults at different positions, as shown in FIG. Figure 5 For example, to simulate a fault at the A1 fault port, you need to adjust the valve of the three-way valve 6 connected to the straight pipe at the A1 fault port to open the straight pipe channel out of A1 and close all other channels, so as to simulate the transformer box 7 fault at the A1 fault port. If you want to simulate a fault at any other fault port, the operation method is the same.

[0048] Regarding the fourth question: when the transformer box 7 fails, the oil flow inside the transformer box 7 begins to surge, and the surging oil flows through the outlet of the transformer box 7 to the main pipeline 9 and finally reaches the oil pillow 11. The flow chart of the flow route of the air flow simulating the surging oil flow during the test is given in the attached figure. Figure 7As shown. The temperature sensor 14 installed on the top surface of the transformer box 7 and the liquid level meter 15 installed on the right side of the transformer box 7 respectively monitor the temperature and height of the oil flow surging inside the transformer box in real time. A pressure sensor 12 is installed at the left position of the height of the middle part of the front of the transformer box 7 where the A-phase winding is facing, at the middle position of the height of the middle part of the front of the transformer box 7 where the B-phase winding is facing, at the middle height of the left side of the transformer box 7 where the A-phase winding is facing, and near the left and right sides of the top surface of the transformer box 7. The pressure curve of the key points inside the transformer box during an oil flow surging cycle is monitored in real time. The flow rate sensor 13 installed on the main pipeline 9 and close to one end of the bellows 10, and the pressure sensor 12 installed on the main pipeline 9 at the front end of the flow rate sensor 13 respectively monitor the flow rate of the surging oil flow in the main pipeline in real time, and the rise and attenuation of the pressure. Through the monitored data, the characteristic quantity of the surging oil flow under fault is refined, and the sensor is monitored in real time, such as Figure 6 shown.

[0049] For the fifth problem: design two sets of main pipes 9 with different diameters, 50mm and 80mm respectively. The outlet diameter of transformer box 7 is fixed to 80mm. By designing two large and small flanges, such as Fig. 9 and Fig.10 When the diameter of the main pipeline 9 is 80 mm, a large flange 8 is used to connect the outlet of the transformer box 7 and the main pipeline 9 with a diameter of 80 mm. Fig.12 As shown; when the diameter of the main pipeline 9 is 50mm, large and small flanges 8 are used together, such as Fig.11 As shown, the transformer box 7 outlet pipe diameter 80mm to the main pipe 50mm diameter conversion is realized. Fig.13 . The flow rate of the surging oil flow in the main pipeline with different pipe diameters, the rise and decay of pressure are measured to form a comparative experiment.

[0050] The present invention is specially designed to solve the problems that the existing transformer test bench cannot carry out transformer fault simulation experiments, cannot simulate the surging oil flow when the transformer fails with different energies, cannot simulate the surging oil flow when the transformer fails at different positions, and cannot monitor in real time the flow rate, pressure rise and attenuation of the surging oil flow in the main pipeline when the transformer box fails. The advantages of the present invention are: reasonable design, simple operation, and the ability to simulate transformer faults under different energies through air flow aids. Through the design of the fault point, fault simulation at different positions inside the transformer can be achieved, and the surging oil flow characteristics of the main pipeline can be measured when the transformer fails internally, providing an important basis for improving transformer protection measures in the future. The device designed by the present invention, which simulates the occurrence of internal transformer faults based on air flow aids, can explore the oil flow and oil pressure transmission characteristics when the transformer box fails internally, which is of great significance for improving transformer protection measures in the future.

[0051] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0052] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for simulating internal faults of transformers based on air flow aids, It is characterized in that include: An air compressor, an air flow aid (2), a cavity (3), a straight pipe (4), a curved pipe (5), a three-way valve (6) and a transformer box (7), wherein the straight pipe (4), the curved pipe (5) and the three-way valve (6) are all arranged inside the transformer box (7); an air outlet of the air compressor is sequentially connected to the air flow aid (2), the cavity (3) and one end of the three-way valve (6) through a pipeline; the other two ends of the three-way valve (6) are respectively connected to the straight pipe (4), the curved pipe (5) and the three-way valve (6). The air compressor injects compressed air into the air flow aid (2) through the air inlet of the air flow aid (2), and when a certain pressure is reached, the pulse electromagnetic valve of the air flow aid (2) is opened, and the compressed air in the air flow aid (2) is instantly ejected through the nozzle, and the ejected gas passes through the cavity (3), the three-way valve (6), and then passes through the straight pipe (4) or the curved pipe (5), impacting the oil flow in the transformer box (7), causing the oil flow inside the transformer box (7) to surge, thereby simulating an internal fault of the transformer box (7); The transformer box (7) contains three-phase windings A, B, and C. Six fault points are evenly arranged on the A winding, and four fault points are evenly arranged on the B winding. Each three-way valve (6) controls two fault point outlets. By adjusting the valve of the three-way valve (6), any channel of the straight pipe (4) or the curved pipe (5) is opened, and any fault point generates impact airflow, and the oil flow begins to surge, thereby simulating internal faults of the transformer at different positions.

2. According to claim 1, a device for simulating internal fault of a transformer based on an air flow aid, It is characterized in that The invention also comprises a main pipeline (9) and an oil pillow (11) which are connected to each other; two identical symmetrical outlets are provided on the left and right sides of the top surface of the transformer box (7); when one set of the main pipeline (9) and the oil pillow (11) is connected to the right outlet of the transformer box (7), air is ejected through the exhaust port of the air flow aid (2) to generate impact airflow at any fault point on the A and B phase windings, thereby simulating faults at different positions in the transformer; when the main pipeline (9) and the oil pillow (11) are connected to the left outlet of the transformer box (7), faults are simulated at 6 different fault points of the A winding, and faults are simulated at the fault points B1 and B2 of the B phase windings, thereby simulating faults at 18 different positions in the transformer box (7).

3. According to claim 2, a device for simulating internal fault of a transformer based on an air flow aid, It is characterized in that One end of the main pipeline (9) is connected to the outlet of the transformer box (7) through a flange (8), and the other end is connected to the oil pillow (11) through a bellows (10).

4. According to claim 2, a device for simulating internal fault of a transformer based on an air flow aid, It is characterized in that A pressure sensor (12) is installed at the left side of the height of the middle of the front face of the transformer box (7) where the A-phase winding faces, at the middle of the height of the middle of the front face of the transformer box (7) where the B-phase winding faces, at the middle of the height of the left side of the transformer box (7) where the A-phase winding faces, and near the left and right outlets on the top face of the transformer box (7). When a fault of the transformer box (7) is simulated, the oil flow inside the box begins to surge, and the pressure sensor (12) synchronously measures the pressure curve of key points inside the transformer box (7) during an oil flow surge cycle.

5. A device for simulating internal fault of a transformer based on an air flow aid according to claim 4, It is characterized in that It also includes a flow rate sensor (13) and a pressure sensor (12), wherein the flow rate sensor (13) is installed on the main pipeline (9) close to the bellows (10), and the pressure sensor (12) is installed on the main pipeline in front of the flow rate sensor (13). When simulating surging oil flows of different energies, the relevant parameters of the flow rate in the pipe, the pressure rise and attenuation are measured respectively, and the characteristic quantity of the surging oil flow is refined.

6. A device for simulating internal fault of a transformer based on an air flow aid according to claim 5, It is characterized in that A temperature sensor (14) is installed on the top of the transformer box (7) and is used to measure the temperature inside the transformer box (7) when a fault occurs.

7. A device for simulating internal fault of a transformer based on an air flow aid according to claim 6, It is characterized in that A liquid level meter (15) is installed on the right side wall of the transformer box (7) to monitor the oil level in the box in real time and obtain the oil drop height of the transformer box (7) under different faults.

8. The device for simulating internal fault of a transformer based on an air flow aid according to claim 7, It is characterized in that Pressure sensors (12) and flow rate sensors (13) are installed on two sets of main pipelines (9) with different pipe diameters to measure the flow rate and pressure curves in the main pipelines (9) with different pipe diameters under the same fault.

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