Shock wave generator and test system for simulating liquid disturbance inside transformer

Abstract

The present invention discloses a shock wave generating device and a test system for simulating the internal liquid disturbance of a transformer, wherein the shock wave generating device comprises: a test conductive wire, a high-voltage end test device for connecting the impulse voltage output end of the impulse voltage generating system, and a grounding end test device for connecting the ground end of the impulse voltage generating system; the high-voltage end test device comprises: a first fixing frame and a first conductor; the grounding end test device comprises: a second fixing frame and a second conductor; one end of the first conductor is fixed on the first fixing frame and is used to connect to the impulse voltage output end; one end of the second conductor is fixed on the second fixing frame and is used to connect to the ground end; the other end of the first conductor is connected to the other end of the second conductor through the test conductive wire. The present invention can simulate the disturbance state of the internal liquid of the transformer when a short circuit fault occurs.

Description

Technical Field

[0001] The invention relates to the field of high voltage technology, and in particular to a shock wave generating device and a testing system for simulating liquid disturbance inside a transformer. Background Art

[0002] As one of the most important assets of power grid companies, the normal operation of power transformers directly affects the stable operation performance of power grid systems. The disturbance of the liquid inside the transformer is of great significance for the detection of the working state of the transformer and the setting of the non-electrical protection of the transformer. At present, although power transformers are equipped with relatively complete electrical protection systems and non-electrical protection systems, the disturbance state of the internal liquid when a short circuit occurs inside the transformer is still unclear. If the internal disturbance state of the transformer is to be analyzed, it is necessary to make the internal components of the transformer actually short-circuit, which will cause the transformer to be scrapped and is not feasible. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a shock wave generating device and a testing system for simulating liquid disturbance inside a transformer, which can simulate the disturbance state of the liquid inside the transformer when a short circuit fault occurs.

[0004] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a shock wave generating device for simulating liquid disturbance inside a transformer, which is used to be placed in the liquid inside the transformer, and includes:

[0005] Conductive wire for testing, a high voltage terminal test device for connecting the impulse voltage output terminal of the impulse voltage generating system, and a ground terminal test device for connecting the ground terminal of the impulse voltage generating system;

[0006] The high voltage end test device comprises: a first fixing frame and a first conductor;

[0007] The ground terminal test device comprises: a second fixing frame and a second conductor;

[0008] One end of the first conductor is fixed on the first fixing frame and is used to connect to the impulse voltage output terminal; one end of the second conductor is fixed on the second fixing frame and is used to connect to the ground terminal; the other end of the first conductor is connected to the other end of the second conductor through the test conductive wire;

[0009] At least one of the first fixing frame and the second fixing frame is used to fix the shock wave generating device inside the transformer.

[0010] As an improvement of the above solution, the first fixing frame includes: a first bracket seat, a second bracket seat and at least one connecting column;

[0011] The first bracket seat and the second bracket seat are opposite to each other and are spaced apart from each other, and the first bracket seat and the second bracket seat are connected by at least one connecting column disposed therebetween;

[0012] The first bracket seat is provided with a first through hole penetrating through the upper and lower surfaces thereof, and the second bracket seat is provided with a first threaded hole penetrating through the upper and lower surfaces thereof;

[0013] The one end of the first conductor is threadedly connected to the first threaded hole and is used to connect to the impulse voltage output end through a first connecting wire passing through the first through hole; the other end of the first conductor extends to the outside of the second bracket seat.

[0014] As an improvement of the above-mentioned scheme, the first bracket seat is further provided with at least one first connecting hole passing through its upper and lower surfaces; the second bracket seat is also provided with at least one second connecting hole passing through its upper and lower surfaces; one end of the at least one connecting column is engaged in the first connecting hole, and the other end of the at least one connecting column is engaged in the second connecting hole.

[0015] As an improvement of the above-mentioned scheme, the number of the first connecting holes, the second connecting holes and the connecting columns are all three; and the three first connecting holes are equidistantly distributed on the edges of the upper and lower surfaces of the first disc-shaped bracket seat, and the three second connecting holes are equidistantly distributed on the edges of the upper and lower surfaces of the second disc-shaped bracket seat.

[0016] As an improvement of the above solution, the first through hole passes through the middle of the upper and lower surfaces of the first bracket seat, and the first threaded hole passes through the middle of the upper and lower surfaces of the second bracket seat.

[0017] As an improvement of the above solution, the first conductor includes an insulating outer wall layer and a conductive rod;

[0018] The insulating outer wall layer wraps around the outer wall of the rod body of the conductive rod, and includes a front insulating layer and a rear insulating layer connected to the front insulating layer; the front insulating layer wraps around the outer wall of the rod body at one end of the conductive rod, and the rear insulating layer wraps around the outer wall of the remaining part of the rod body of the conductive rod; the outer diameter of the front insulating layer is greater than the inner diameter of the first threaded hole, and the outer wall of the rear insulating layer is provided with an external thread and matched with the internal thread of the first threaded hole;

[0019] A first wire fixing groove for fixing the first connecting wire is formed at one end of the conductive rod; a first connector is formed at the other end of the conductive rod, both ends of the first connector are connected to the other end of the conductive rod, and the remaining part of the first connector is spaced apart from the other end of the conductive rod to form a first fixing hole for fixing the conductive wire for testing.

[0020] As an improvement of the above solution, the first conductor further includes a first claw frame, and the first claw frame has three claws;

[0021] The three claws are equidistantly distributed on the other end of the conductive rod and extend outward from the other end of the conductive rod; and the three claws mutually surround a fixed cavity; when the test conductive wire passes through the fixed cavity and is connected to the first fixing hole, it is caught by the three claws.

[0022] As an improvement of the above solution, the first connector is semicircular.

[0023] As an improvement of the above solution, the second fixing frame has the same structure as the first fixing frame, and the second conductor has the same structure as the first conductor.

[0024] Another embodiment of the present invention provides a simulation test system for simulating and testing liquid disturbance inside a transformer, which includes an impulse voltage generation system, a shock wave detection sensor, a test device, and a shock wave generation device for simulating liquid disturbance inside a transformer as described in any of the above schemes;

[0025] The shock wave detection sensor is used to be placed in the liquid inside the transformer and to detect the shock wave generated by the liquid disturbance in the transformer;

[0026] The impulse voltage generating system is used to generate an impulse voltage simulating the voltage when the internal device of the transformer is short-circuited, and its impulse voltage output end is connected to one end of the first conductor, and its ground end is connected to one end of the second conductor;

[0027] The testing device is connected to the shock wave detection sensor and is used to collect detection data of the shock wave detection sensor.

[0028] Compared with the prior art, the shock wave generating device for simulating the liquid disturbance inside the transformer provided in the embodiment of the present invention can be placed in the liquid inside the transformer when it is necessary to analyze the liquid disturbance caused by the short circuit fault inside the transformer, and the shock wave generating device is fixed inside the transformer by the first fixing frame and / or the second fixing frame, and the position of the internal device of the transformer when the short circuit fault occurs is accurately simulated by adjusting the fixed position of the first fixing frame and / or the second fixing frame in the transformer, and then the impulse voltage generating system is used to generate an impulse voltage simulating the voltage when the internal device of the transformer is short-circuited, and the impulse voltage will cause the conductive wire for testing to melt, and the performance of the conductive plasma channel between the electrodes will simulate the internal short circuit fault. The cavity generated by the plasma channel in the oil inside the transformer will expand rapidly due to the high temperature gasification of the oil, and the stress generated by the gasification inside the cavity will interact with the pressure applied by the oil outside the cavity, so that the cavity will produce an oscillation effect, thereby generating shock waves in the oil, and then accurately simulating the liquid disturbance caused by the short circuit fault inside the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of a shock wave generating device for simulating liquid disturbance inside a transformer provided by an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 The structural schematic diagram of the high-voltage end test device is shown;

[0032] Figure 3 It is a structural schematic diagram of a simulation test system for simulating and testing liquid disturbance inside a transformer provided by an embodiment of the present invention.

[0033] Notes on the attached drawings:

[0034] 1. Transformer;

[0035] 2. Conductive wire for testing;

[0036] 3. Impulse voltage generating system; 30. DC power supply; 31. Impulse generator;

[0037] 4. High voltage end test device; 40. First fixing frame; 400. First bracket seat; 4001. First through hole; 4002. First connecting hole; 401. Second bracket seat; 4011. First threaded hole; 4012. Second connecting hole; 402. Connecting column; 41. First conductor; 410. Insulating outer wall layer; 4101. Front insulating layer; 4102. Rear insulating layer; 411. Conductive rod; 4110. First wire fixing groove; 4111. First connecting body; 4112. First fixing hole; 412. First claw frame;

[0038] 5. Ground terminal test device; 50. Second fixing frame; 51. Second conductor;

[0039] 6. A first connecting wire;

[0040] 7. Shock wave detection sensor;

[0041] 8. Test equipment. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in 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.

[0043] In the description of the specification and claims, it is necessary to understand that the terms "upper", "lower", "front", "back", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0044] In addition, the terms first, second, etc. in the specification and claims are only used for the purpose of describing the same technical features, and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing an order or time sequence. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0045] See also Figure 1An embodiment of the present invention provides a shock wave generating device for simulating liquid disturbance inside a transformer, which is used to be placed in the liquid inside the transformer 1, and includes: a test conductive wire 2, a high-voltage end test device 4 for connecting the impulse voltage output end of the impulse voltage generating system 3, and a grounding end test device 5 for connecting the ground end of the impulse voltage generating system 3; the high-voltage end test device 4 includes: a first fixing frame 40 and a first conductor 41; the grounding end test device 5 includes: a second fixing frame 50 and a second conductor 51; one end of the first conductor 41 is fixed on the first fixing frame 40 and is used to connect to the impulse voltage output end; one end of the second conductor 51 is fixed on the second fixing frame 50 and is used to connect to the ground end; the other end of the first conductor 41 is connected to the other end of the second conductor 51 through the test conductive wire 2; at least one of the first fixing frame 40 and the second fixing frame 50 is used to fix the shock wave generating device inside the transformer 1.

[0046] In this embodiment, when it is necessary to analyze the liquid disturbance caused by the short circuit fault inside the transformer 1, the shock wave generating device can be placed in the liquid inside the transformer 1, and the shock wave generating device can be fixed inside the transformer 1 by the first fixing frame 40 and / or the second fixing frame 50, and the fixed position of the first fixing frame 40 and / or the second fixing frame 50 in the transformer 1 can be adjusted to accurately simulate the position of the internal device of the transformer 1 when the short circuit fault occurs, and then the impulse voltage generating system 3 can be used to generate an impulse voltage simulating the voltage when the internal device of the transformer 1 is short-circuited, and the impulse voltage will cause the test conductive wire to melt, and the electrodes will form a conductive plasma channel, thereby simulating the internal short circuit fault. The cavity generated by the plasma channel in the oil inside the transformer 1 will expand rapidly due to the high-temperature gasification of the oil, and the stress generated by the gasification inside the cavity will interact with the pressure applied by the oil outside the cavity, so that the cavity will produce an oscillation effect, thereby generating shock waves in the oil, and then accurately simulating the liquid disturbance caused by the short circuit fault inside the transformer 1.

[0047] As an improvement of the above scheme, see Figure 1 and Figure 2, the first fixing frame 40 includes: a first bracket seat 400, a second bracket seat 401 and at least one connecting column 402; the first bracket seat 400 and the second bracket seat 401 are arranged opposite to each other and spaced apart, and the first bracket seat 400 and the second bracket seat 401 are connected by at least one connecting column 402 arranged therebetween; the first bracket seat 400 is provided with a first through hole 4001 penetrating through its upper and lower surfaces, and the second bracket seat 401 is provided with a first threaded hole 4011 penetrating through its upper and lower surfaces; the one end of the first conductor 41 is threadedly connected to the first threaded hole 4011, and is used to connect to the impulse voltage output terminal through the first connecting wire 6 passing through the first through hole 4001; the other end of the first conductor 41 extends to the outside of the second bracket seat 401. Among them, the first conductor 41 and the first threaded hole 4011 are threadedly connected, so that the position of the first conductor 41 can be adjusted by the lifting and lowering displacement of the threads, thereby being able to more accurately simulate the position of the internal device of the transformer 1 when a short circuit fault occurs. In addition, the first through hole 4001 can allow the first connecting wire 6 to flexibly pass through, thereby preventing the first connecting wire from being pulled due to adjustment of the position of the first fixing frame 40 .

[0048] Exemplarily, the first bracket seat 400 and the second bracket seat 401 may be made of plastic material or template material, etc., which is not specifically limited here.

[0049] As an improvement of the above scheme, see Figure 1 and Figure 2 The first bracket seat 400 is also provided with at least one first connecting hole 4002 which passes through its upper and lower surfaces; the second bracket seat 401 is also provided with at least one second connecting hole 4012 which passes through its upper and lower surfaces; one end of the at least one connecting column 402 is fitted into the first connecting hole 4002, and the other end of the at least one connecting column 402 is fitted into the second connecting hole 4012, so that the first bracket seat 400 and the second bracket seat 401 can be firmly connected.

[0050] As an improvement of the above scheme, see Figure 1 and Figure 2 , the number of the first connecting hole 4002, the second connecting hole 4012 and the connecting column 402 are all three; and the three first connecting holes 4002 are equidistantly distributed on the edges of the upper and lower surfaces of the first disc-shaped bracket seat 400, and the three second connecting holes 4012 are equidistantly distributed on the edges of the upper and lower surfaces of the second disc-shaped bracket seat 401.

[0051] As an improvement of the above scheme, see Figure 1 and Figure 2The first through hole 4001 passes through the middle of the upper and lower surfaces of the first bracket seat 400 , and the first threaded hole 4011 passes through the middle of the upper and lower surfaces of the second bracket seat 401 .

[0052] As an improvement of the above scheme, see Figure 1 and Figure 2 The first conductor 41 includes an insulating outer wall layer 410 and a conductive rod 411; the insulating outer wall layer 410 wraps the outer wall of the rod body of the conductive rod 411, and includes a front insulating layer 4101 and a rear insulating layer 4102 connected to the front insulating layer; the front insulating layer wraps the outer wall of the rod body at one end of the conductive rod 411, and the rear insulating layer wraps the outer wall of the remaining part of the rod body of the conductive rod 411; the outer diameter of the front insulating layer is larger than the inner diameter of the first threaded hole 4011, and the outer diameter of the rear insulating layer is larger than the inner diameter of the first threaded hole 4011. The wall is provided with external threads and matched with the internal threads of the first threaded hole 4011; one end of the conductive rod 411 is provided with a first wire fixing groove 4110 for fixing the first connecting wire 6; the other end of the conductive rod 411 is provided with a first connector 4111, both ends of the first connector 4111 are connected to the other end of the conductive rod 411, and the remaining part of the first connector 4111 is spaced apart from the other end of the conductive rod 411 to form a first fixing hole 4112 for fixing the test conductive wire. Among them, the outer diameter of the front insulating layer is larger than the inner diameter of the first threaded hole 4011, which can play a limiting role and prevent the first conductive body 41 from falling off from the second bracket seat 401 when the first threaded hole 4011 is screwed.

[0053] Exemplarily, the conductive rod 411 is a brass conductive rod 411. The insulating outer wall layer 410 is made of plastic, such as PVC plastic.

[0054] As an improvement of the above scheme, see Figure 1 and Figure 2 The first conductor 41 further includes a first claw frame 412, which has three claws; the three claws are equidistantly distributed on the other end of the conductive rod 411 and extend outward from the other end of the conductive rod 411; and the three claws mutually surround a fixed cavity; when the test conductive wire passes through the fixed cavity and is connected to the first fixing hole 4112, it is caught by the three claws. By setting the first claw frame 412 with three claws, the test conductive wire can be fixed more firmly.

[0055] Exemplarily, the testing conductive wire is a bare copper wire.

[0056] Exemplarily, the first connector 4111 is semicircular.

[0057] As an improvement of the above scheme, see Figure 1 The second fixing frame 50 has the same structure as the first fixing frame 40, and the second conductor 51 has the same structure as the first conductor 41, but they may also be different.

[0058] See also Figure 3 Another embodiment of the present invention provides a simulation test system for simulating and testing liquid disturbance inside a transformer, which includes an impulse voltage generating system 3, a shock wave detection sensor 7, a test device 8 and a shock wave generating device for simulating liquid disturbance inside a transformer as described in any of the above schemes; the shock wave detection sensor 7 is used to be placed in the liquid inside the transformer 1, and is used to detect the shock wave generated by the liquid disturbance inside the transformer 1; the impulse voltage generating system 3 is used to generate an impulse voltage simulating the voltage when the internal device of the transformer 1 is short-circuited, and its impulse voltage output end is connected to one end of the first conductor 41, and its ground end is connected to one end of the second conductor 51; the test device 8 is connected to the shock wave detection sensor 7, and is used to collect detection data of the shock wave detection sensor 7.

[0059] Exemplarily, the shock wave detection sensor 7 may be a pressure sensor or an acoustic wave sensor. The testing device 8 may be a computer.

[0060] Exemplarily, the impulse voltage generating system 3 includes a DC power supply 30, an impulse generator 31 and a switch (not shown); the DC power supply 30 is connected to the impulse generator 31, and the switch is connected between the impulse generator 31 and the shock wave generating device, wherein the DC power supply 30 will charge the impulse generator 31. After charging is completed, the switch can be closed, and at this time, the impulse generator 31 will apply an impulse voltage to the shock wave generating device.

[0061] In this embodiment, when it is necessary to analyze the liquid disturbance caused by the short circuit fault inside the transformer 1, the shock wave generating device can be placed in the liquid inside the transformer 1, and the shock wave generating device can be fixed inside the transformer 1 by the first fixing frame 40 and / or the second fixing frame 50, and the fixed position of the first fixing frame 40 and / or the second fixing frame 50 in the transformer 1 can be adjusted to accurately simulate the position of the internal device of the transformer 1 when the short circuit fault occurs, and then the impulse voltage generating system 3 can be used to generate an impulse voltage simulating the voltage when the internal device of the transformer 1 is short-circuited, and the impulse voltage will cause the test conductive wire to melt, and the electrodes will form a conductive plasma channel, thereby simulating the internal short circuit fault. The cavity generated by the plasma channel in the oil inside the transformer 1 will expand rapidly due to the high-temperature gasification of the oil, and the stress generated by the gasification inside the cavity will interact with the pressure applied by the oil outside the cavity, so that the cavity will produce an oscillation effect, thereby generating shock waves in the oil, and then accurately simulating the liquid disturbance caused by the short circuit fault inside the transformer 1. In addition, by placing the shock wave detection sensor 7 in the internal oil of the transformer 1, the shock wave of the liquid disturbance inside the transformer 1 can be detected, and the test equipment 8 can accurately analyze the shock wave characteristics of the liquid disturbance inside the transformer 1 by analyzing the detection data of the sensor.

[0062] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A shock wave generating device for simulating liquid disturbance inside a transformer, which is placed in the liquid inside the transformer, characterized in that: include: Conductive wire for testing, a high voltage terminal test device for connecting the impulse voltage output terminal of the impulse voltage generating system, and a ground terminal test device for connecting the ground terminal of the impulse voltage generating system; The high voltage end test device comprises: a first fixing frame and a first conductor; The ground terminal test device comprises: a second fixing frame and a second conductor; One end of the first conductor is fixed on the first fixing frame and is used to connect to the impulse voltage output terminal; one end of the second conductor is fixed on the second fixing frame and is used to connect to the ground terminal; the other end of the first conductor is connected to the other end of the second conductor through the test conductive wire; At least one of the first fixing frame and the second fixing frame is used to fix the shock wave generating device inside the transformer; in, The first fixing frame includes: a first bracket seat, a second bracket seat and at least one connecting column; The first bracket seat and the second bracket seat are opposite to each other and spaced apart, and the first bracket seat and the second bracket seat are connected by at least one connecting column disposed between the first bracket seat and the second bracket seat; The first bracket seat is provided with a first through hole penetrating through the upper and lower surfaces thereof, and the second bracket seat is provided with a first threaded hole penetrating through the upper and lower surfaces thereof; The one end of the first conductor is threadedly connected to the first threaded hole and is used to connect to the impulse voltage output end through a first connecting wire passing through the first through hole; the other end of the first conductor extends to the outside of the second bracket seat; The first bracket seat is also provided with at least one first connection hole penetrating through the upper and lower surfaces thereof; the second bracket seat is also provided with at least one second connection hole penetrating through the upper and lower surfaces thereof; one end of the at least one connection column is fitted into the first connection hole, and the other end of the at least one connection column is fitted into the second connection hole; The first conductor includes an insulating outer wall layer and a conductive rod; The insulating outer wall layer wraps around the outer wall of the rod body of the conductive rod, and includes a front insulating layer and a rear insulating layer connected to the front insulating layer; the front insulating layer wraps around the outer wall of the rod body at one end of the conductive rod, and the rear insulating layer wraps around the outer wall of the remaining part of the rod body of the conductive rod; the outer diameter of the front insulating layer is greater than the inner diameter of the first threaded hole, and the outer wall of the rear insulating layer is provided with an external thread and matched with the internal thread of the first threaded hole; A first wire fixing groove for fixing the first connecting wire is formed at one end of the conductive rod; a first connector is formed at the other end of the conductive rod, both ends of the first connector are connected to the other end of the conductive rod, and the remaining part of the first connector is spaced apart from the other end of the conductive rod to form a first fixing hole for fixing the conductive wire for testing.

2. The shock wave generating device for simulating liquid disturbance inside a transformer according to claim 1, characterized in that: The number of the first connecting holes, the second connecting holes and the connecting columns are all three; and the three first connecting holes are equidistantly distributed on the edges of the upper and lower surfaces of the first disc-shaped bracket seat, and the three second connecting holes are equidistantly distributed on the edges of the upper and lower surfaces of the second disc-shaped bracket seat.

3. The shock wave generating device for simulating liquid disturbance inside a transformer according to claim 1, characterized in that: The first through hole passes through the middle of the upper and lower surfaces of the first bracket seat, and the first threaded hole passes through the middle of the upper and lower surfaces of the second bracket seat.

4. The shock wave generating device for simulating liquid disturbance inside a transformer according to claim 1, characterized in that: The first conductor further includes a first claw frame, wherein the first claw frame has three claws; The three claws are equidistantly distributed on the other end of the conductive rod and extend outward from the other end of the conductive rod; and the three claws mutually surround a fixed cavity; when the test conductive wire passes through the fixed cavity and is connected to the first fixing hole, it is caught by the three claws.

5. The shock wave generating device for simulating liquid disturbance inside a transformer according to claim 1, characterized in that: The first connecting body is semicircular.

6. The shock wave generating device for simulating liquid disturbance inside a transformer according to any one of claims 1 to 5, characterized in that: The second fixing frame has the same structure as the first fixing frame, and the second conductor has the same structure as the first conductor.

7. A simulation test system for simulating and testing the internal liquid disturbance of a transformer, characterized in that: It comprises an impulse voltage generating system, a shock wave detection sensor, a testing device and a shock wave generating device for simulating liquid disturbance inside a transformer as claimed in any one of claims 1 to 6; The shock wave detection sensor is used to be placed in the liquid inside the transformer and to detect the shock wave generated by the liquid disturbance in the transformer; The impulse voltage generating system is used to generate an impulse voltage simulating the voltage when the internal device of the transformer is short-circuited, and its impulse voltage output end is connected to one end of the first conductor, and its ground end is connected to one end of the second conductor; The testing device is connected to the shock wave detection sensor and is used to collect detection data of the shock wave detection sensor.

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