Transformer insulation withstand voltage detection device and method

Abstract

The present invention belongs to the technical field of hydraulic equipment, and in particular relates to a transformer insulation withstand voltage testing device and method thereof, comprising a testing platform with a withstand voltage tester provided on its outer wall, a conveyor roller provided on the testing platform, a transformer to be tested placed on the conveyor roller, the withstand voltage tester connected to a probe, and a cleaning mechanism, a water supply mechanism, and a heat conduction mechanism, which sequentially complete the cleaning, drying, and testing of the transformer to be tested. The present invention uses the conveyor roller to drive the transformer to be tested to move, thereby simultaneously cleaning, drying, and testing the surface of the transformer to be tested, and can quickly complete the testing of multiple transformers to be tested. The heat generated by the withstand voltage tester during operation is used to heat the airflow, thereby improving energy utilization. The heat can be used to complete drying while also cooling the withstand voltage tester.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical performance testing, and in particular to a transformer insulation withstand voltage testing device and a method thereof. Background Art

[0002] Transformers are critical equipment in power systems, and their insulation performance directly determines their safety and reliability. However, in actual operation, due to long-term exposure to electric and magnetic fields, temperature, and mechanical stress, transformer insulation materials may age, crack, or experience partial discharge, leading to insulation failure and even equipment malfunction. Therefore, accurate and rapid testing of transformer insulation performance is crucial.

[0003] The main method for testing the insulation strength of a transformer is to apply AC / DC high voltage higher than the working voltage through a voltage withstand tester to test the insulation layer's tolerance under high voltage and determine whether a breakdown occurs. At the moment of breakdown, the conductivity of the insulating material suddenly increases, and the leakage current exceeds the set threshold, triggering the tester alarm. During the test process, the voltage withstand tester needs to run for a long time to complete high-precision testing, but long-term operation will cause the equipment to overheat. The heat is generally handled by air cooling or water cooling, and cannot be effectively utilized. Therefore, how to ensure high-precision testing while realizing heat utilization is an urgent problem that needs to be solved.

[0004] To solve the above problems, we propose a transformer insulation withstand voltage detection device and method. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a transformer insulation withstand voltage detection device and method.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a transformer insulation and withstand voltage testing device, comprising a testing platform with a withstand voltage tester arranged on the outer wall, a conveying roller arranged on the testing platform, a transformer to be tested placed on the conveying roller, the withstand voltage tester is connected to a probe, a fixing plate is fixedly installed on the testing platform, a cleaning mechanism for cleaning the transformer to be tested is arranged on the fixing plate, the cleaning mechanism comprises a movable brush plate, a water supply mechanism for intermittently draining water to moisten the bristles of the brush plate is arranged on the brush plate, a thermoelectric cooler is fixed on the outer wall of the withstand voltage tester, a heat conducting mechanism is arranged on the outer wall of the thermoelectric cooler, the heat conducting mechanism comprises a blower and a hot air pipe arranged towards the transformer to be tested, the heat on the thermoelectric cooler is absorbed by the heat conducting mechanism and blown out from the hot air pipe, and the transformer to be tested is dried after cleaning the brush plate.

[0007] In the above-mentioned transformer insulation and withstand voltage testing equipment, the cleaning mechanism also includes a motor fixed on a fixed plate, the driving end of the motor is fixedly connected to a turntable, the upper side wall of the turntable is rotatably connected to a connecting rod at a position deviating from the center of the circle, the other end of the connecting rod is rotatably connected to the end of the brush plate, and a connecting plate is also fixed on the fixed plate, and a guide plate is fixed to the end of the connecting plate. The brush plate is sleeved on the outer wall of the guide plate, and an I-shaped groove is provided at the connection between the brush plate and the guide plate.

[0008] In the above-mentioned transformer insulation and withstand voltage testing equipment, the water supply mechanism includes a water tank fixed at the end of the connecting plate, the lower side wall of the water tank is connected to a drain pipe with a closed lower end, the upper side wall of the brush plate is fixed with a right-angle tube whose end is slidably inserted into the drain pipe, the lower side wall of the brush plate is provided with a through opening, the interior of the brush plate is connected to the through opening with the right-angle tube through a plurality of connecting tubes, the other end of the right-angle tube is closed, and the outer wall of the right-angle tube is provided with a water inlet connected to the interior thereof, and the water inlet is intermittently connected to the drain pipe through the reciprocating movement of the brush plate, so that the water in the water tank is intermittently discharged to moisten the bristles on the brush plate.

[0009] In the above-mentioned transformer insulation and withstand voltage detection equipment, the heat conduction mechanism includes a frame on the outer wall of the thermoelectric cooler, an air inlet is installed at the end of the frame, the blower is installed at the end of the air inlet, an air flow distribution plate is fixedly installed in the air inlet, and heat conduction fins arranged in a grid are fixed in the frame, and a plurality of evenly distributed heat conduction rods are fixed between the heat conduction fins and the inner wall of the frame. The heat on the thermoelectric cooler is absorbed by the heat conduction fins and the heat conduction rods to heat the air flow blown into the frame by the blower. The upper side wall of the frame is connected to the air supply pipe through a conical cover, and a plurality of hot air pipes are vertically installed at the end of the air supply pipe.

[0010] In the above-mentioned transformer insulation withstand voltage testing device, a motor is fixed on the fixing plate, and the end of the probe is fixed on the driving end of the motor.

[0011] In the above-mentioned transformer insulation and withstand voltage testing equipment, a slide groove is provided on the air supply pipe, a lifting plate is slidably arranged in the slide groove, two connecting channels are provided on the lifting plate for horizontal penetration, an electric heating wire is provided inside the connecting channel located on the lower side, an electric push rod is fixed to the outer wall of the air supply pipe, and a horizontally arranged connecting block is fixedly connected between the driving end of the electric push rod and the outer wall of the lifting plate.

[0012] A method for using a transformer insulation withstand voltage testing device comprises the following steps:

[0013] S1. Multiple transformers to be inspected are placed on the inspection table. The rotation of the conveyor roller drives the transformers to be inspected to move forward intermittently, and the cleaning, drying and inspection work are carried out in sequence.

[0014] S2. During cleaning, the transformer to be inspected comes into contact with the bristles of the brush plate, and the motor is started to drive the turntable and the end of the connecting rod to make a circular motion, while the other end of the connecting rod pulls the brush plate to move back and forth;

[0015] During the back-and-forth movement of the brush plate, the water inlet is intermittently connected to the drain pipe, so that the water in the water tank intermittently flows out to moisten the bristles on the brush plate. After the bristles are moistened, the brush plate moves back and forth to clean the surface of the transformer to be inspected.

[0016] S3. The cleaned transformer to be inspected is moved to the lower side of the hot air pipe for drying. The heat generated by the withstand voltage tester during operation is discharged through the thermoelectric cooler. The heat-conducting fins and the heat-conducting rods absorb the heat from the end of the thermoelectric cooler. The blower blows the external air into the frame. The air absorbs the heat from the heat-conducting fins and the heat-conducting rods and then enters the air supply pipe through the conical cover. It is then blown out from the end of the hot air pipe to dry the cleaned transformer to be inspected. At the same time, impurities loosened by the brush on the surface of the transformer to be inspected can be blown away.

[0017] S4. The dried transformer to be tested continues to be transported forward, and the probe contacts the transformer to be tested to perform a withstand voltage test on the transformer to be tested. The withstand voltage tester gradually increases the voltage from a low voltage, observes the change trend of the leakage current, and evaluates the insulation condition. If the tester detects that the current exceeds the preset threshold, the transformer to be tested has broken down. If it does not reach the preset threshold, it indicates that the insulation strength of the transformer to be tested is good. At the same time, the transformer to be tested behind is being cleaned and dried in turn, so that the cleaning, drying, and testing work are carried out simultaneously and continuously.

[0018] S5. The above work is carried out in sequence to complete the inspection of all transformers to be inspected.

[0019] Compared with existing technologies, the advantages of this transformer insulation withstand voltage testing equipment are:

[0020] A cleaning mechanism, a water supply mechanism, a heat conduction mechanism and a withstand voltage tester are provided. The conveying roller rotates intermittently to move the transformer to be tested, so that the transformer to be tested is moved to the side of the cleaning mechanism, the heat conduction mechanism and the withstand voltage tester, so that cleaning, drying and testing can be carried out simultaneously, which speeds up the testing process.

[0021] During the back-and-forth movement of the brush plate, the water inlet is intermittently connected to the drain pipe, so that the water in the water tank flows out intermittently to moisten the bristles on the brush plate. After the bristles are moistened, combined with the back-and-forth movement of the brush plate, the cleaning ability is stronger, thereby completing the cleaning of the surface of the transformer to be inspected;

[0022] The heat generated by the withstand voltage tester during operation is dissipated through the thermoelectric cooler. The heat-conducting fins and heat-conducting rods absorb the heat at the end of the thermoelectric cooler. The blower blows the external air into the frame. The air absorbs the heat from the heat-conducting fins and heat-conducting rods and then enters the air supply pipe through the conical cover. It is then blown out from the end of the hot air pipe to dry the cleaned transformer to be tested.

[0023] In summary, the present invention drives the transformer to be inspected to move by the conveyor roller, so that the surface cleaning, drying and inspection of the transformer to be inspected can be carried out simultaneously, and the inspection work of multiple transformers to be inspected can be quickly completed. The heat generated when the withstand voltage tester is working can be used to heat the airflow, thereby improving energy utilization efficiency. While completing drying with the help of heat, the withstand voltage tester can also be cooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of a transformer insulation withstand voltage testing device proposed by the present invention;

[0025] Figure 2 This is a structural schematic diagram of a transformer insulation withstand voltage testing device proposed by the present invention from another perspective;

[0026] Figure 3 This is a structural diagram of the connection between the brush plate and the water tank in a transformer insulation and withstand voltage testing device proposed by the present invention;

[0027] Figure 4 A side view of the connection between the frame and the air supply duct in a transformer insulation withstand voltage testing device proposed by the present invention;

[0028] Figure 5 A schematic diagram of the structure of the connection between the heat-conducting fin plate and the heat-conducting rod in a transformer insulation withstand voltage testing device proposed by the present invention;

[0029] Figure 6 A schematic structural diagram of a transformer insulation withstand voltage testing device in the present invention;

[0030] Figure 7 A side view of the connection between the electric push rod and the lifting plate in a transformer insulation withstand voltage testing device proposed by the present invention;

[0031] Figure 8 This is a schematic diagram of the distribution state of the transformers to be tested on the test platform in the transformer insulation and withstand voltage testing equipment proposed by the present invention;

[0032] Figure 9 This is a structural schematic diagram of the connection between the blower and the air flow distribution plate in a transformer insulation and withstand voltage testing device proposed by the present invention.

[0033] In the figure: 1 testing table, 2 conveyor roller, 3 transformer to be tested, 4 fixing plate, 5 withstand voltage tester, 6 thermoelectric cooler, 7 air inlet, 8 blower, 9 frame, 10 cone cover, 11 air supply pipe, 12 hot air pipe, 13 motor, 14 probe, 15 brush plate, 16 water tank, 17 motor, 18 turntable, 19 connecting rod, 20 connecting plate, 21 guide plate, 22 I-shaped groove, 23 right-angle pipe, 24 water inlet, 25 heat-conducting fin plate, 26 heat-conducting rod, 27 lifting plate, 28 electric push rod, 29 connecting channel, 30 electric heating wire, 31 air flow distribution plate. DETAILED DESCRIPTION

[0034] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0035] Reference Figure 1-Figure 4 , a transformer insulation and withstand voltage testing equipment, including a testing platform 1 with a withstand voltage tester 5 on the outer wall, a conveying roller 2 is provided on the testing platform 1, a transformer 3 to be tested is placed on the conveying roller 2, the withstand voltage tester 5 is connected to a probe 14, a motor 13 is fixed on the fixing plate 4, the end of the probe 14 is fixed on the driving end of the motor 13, when the transformer 3 to be tested moves to the lower side of the probe 14, the motor 13 drives the probe 14 to rotate so that it contacts the transformer 3 to be tested, the withstand voltage tester 5 gradually increases the voltage from a low voltage, observes the changing trend of the leakage current, and evaluates the insulation status, and when the tester detects that the current exceeds a preset threshold value, the transformer 3 to be tested breaks down, and when it does not reach the preset threshold value, it indicates that the insulation strength of the transformer 3 to be tested is good, the withstand voltage tester 5 and the connected probe 14 are both existing equipment for withstand voltage testing, and the specific principles and operations are not repeated here.

[0036] A fixed plate 4 is fixedly mounted on the inspection table 1, and a cleaning mechanism for cleaning the transformer 3 to be inspected is provided on the fixed plate 4. The cleaning mechanism includes a movable brush plate 15, and the cleaning mechanism also includes a motor 17 fixed to the fixed plate 4. The driving end of the motor 17 is fixedly connected to a turntable 18, and the upper side wall of the turntable 18 is rotatably connected to a connecting rod 19 at a position deviating from the center of the circle. The other end of the connecting rod 19 is rotatably connected to the end of the brush plate 15. A connecting plate 20 is also fixed on the fixed plate 4, and a guide plate 21 is fixed to the end of the connecting plate 20. The brush plate 15 is sleeved on the outer wall of the guide plate 21, and the connection between the brush plate 15 and the guide plate 21 is opened. There is an I-shaped groove 22, and the guide plate 21 is located in the I-shaped groove 22, forming a support for the brush plate 15, so that the brush plate 15 can move back and forth smoothly, and the starting motor 17 drives the turntable 18 and the end of the connecting rod 19 to make a circular motion. Under the action of the guide plate 21 limiting the brush plate 15, the other end of the connecting rod 19 pulls the brush plate 15 back and forth, so that the bristles are constantly in contact with the transformer 3 to be inspected, such as the insulator, to brush off the impurities and dust on the surface, avoiding the presence of dust, oil and other impurities during subsequent inspections that may cause partial discharge, thereby reducing the breakdown voltage of the insulating material and increasing the risk of failure.

[0037] The brush plate 15 is provided with a water supply mechanism for intermittent drainage to moisten the bristles of the brush plate 15. The water supply mechanism includes a water tank 16 fixed to the end of the connecting plate 20. The lower side wall of the water tank 16 is connected to a drainage pipe with a closed lower end. A right-angle tube 23 with an end slidingly inserted into the drainage pipe is fixed to the upper side wall of the brush plate 15. The lower side wall of the brush plate 15 is provided with a through opening. The interior of the brush plate 15 is connected to the right-angle tube 23 through a plurality of connecting tubes. The other end of the right-angle tube 23 is closed. A water inlet 24 connected to the interior thereof is provided on the outer wall of the right-angle tube 23. The reciprocating movement of the brush plate 15 enables the water inlet 24 to be intermittently connected to the drainage pipe, so that the water in the water tank 16 is intermittently discharged to moisten the bristles on the brush plate 15.

[0038] A thermoelectric cooler 6 is fixed to the outer wall of the withstand voltage tester 5. The thermoelectric cooler 6 is an existing electronic component. The specific principle includes loading a low DC voltage at both ends of the thermoelectric cooler 6. When the current passes through the PN junction, electrons and holes combine at the cold end, absorbing environmental heat (absorbing the heat generated during the operation of the withstand voltage tester 5), causing the temperature to drop (cooling the withstand voltage tester 5). At the other end, the carriers separate and release heat to form a hot end (the heat at the hot end is transferred to the heat-conducting fins 25 and the heat-conducting rods 26).

[0039] The outer wall of the thermoelectric cooler 6 is provided with a heat conduction mechanism, which includes a blower 8 and a hot air pipe 12 arranged toward the transformer 3 to be inspected. The heat on the thermoelectric cooler 6 is adsorbed by the heat conduction mechanism and blown out from the hot air pipe 12 to dry the transformer 3 to be inspected after being cleaned by the brush plate 15. The heat conduction mechanism includes a frame 9 on the outer wall of the thermoelectric cooler 6, an air inlet 7 is installed at the end of the frame 9, the blower 8 is installed at the end of the air inlet 7, an air flow distribution plate 31 is fixedly installed in the air inlet 7, and a heat conduction fin 25 arranged in a grid is fixed in the frame 9. There is heat between the heat conduction fin 25 and the inner wall of the frame 9. A plurality of evenly distributed heat-conducting rods 26 are fixed, and the heat from the thermoelectric cooler 6 is absorbed by the heat-conducting fins 25 and the heat-conducting rods 26 to heat the air flow blown into the frame 9 by the blower 8. The upper side wall of the frame 9 is connected to the air supply pipe 11 through the conical cover 10, and a plurality of hot air pipes 12 are vertically installed at the end of the air supply pipe 11. After the air flow absorbs the heat from the heat-conducting fins 25 and the heat-conducting rods 26, it enters the air supply pipe 11 through the conical cover 10, and is then blown out from the end of the hot air pipe 12 to dry the cleaned transformer 3 to be inspected, and at the same time, impurities loosened by the brush plate 15 on the surface of the transformer 3 to be inspected can be blown away.

[0040] A chute is provided on the air supply pipe 11, and a lifting plate 27 is slidingly provided in the chute. Two connecting channels 29 are provided on the lifting plate 27, and an electric heating wire 30 is provided inside the connecting channel 29 at the lower side. An electric push rod 28 is fixed to the outer wall of the air supply pipe 11, and a horizontally arranged connecting block is fixedly connected between the driving end of the electric push rod 28 and the outer wall of the lifting plate 27. Since the transformer 3 to be tested needs to be cleaned and dried at the beginning of the test, the withstand voltage tester 5 is not working, and the air flow introduced at this time cannot be heated, so the lifting plate 2 is driven by the electric push rod 28. 7 rises, so that the lower connecting channel 29 is connected to the air supply pipe 11, and the electric heating wire 30 is connected to the external power supply to heat the air flow to complete the drying work. After the subsequent pressure tester 5 works, the connection between the electric heating wire 30 and the external power supply is disconnected, and the driving end of the electric push rod 28 is retracted to drive the lifting plate 27 to move downward, so that the upper connecting channel 29 is connected to the air supply pipe 11, so that the heat generated by the pressure tester 5 heats the air flow, thereby improving the energy utilization rate. After the lifting plate 27 moves, the electric heating wire 30 is no longer in contact with the air flow, which reduces the electric heating wire 30 being eroded by the air flow due to long-term contact with the air flow.

[0041] A method for using a transformer insulation withstand voltage testing device comprises the following steps:

[0042] S1. Multiple transformers 3 to be inspected are placed on the inspection table 1. The rotation of the conveyor roller 2 drives the transformers 3 to be inspected to move forward intermittently, and the cleaning, drying and inspection work are carried out in sequence.

[0043] S2. During cleaning, the transformer 3 to be inspected comes into contact with the bristles of the brush plate 15, and the motor 17 is started to drive the turntable 18 and the end of the connecting rod 19 to make a circular motion. The other end of the connecting rod 19 pulls the brush plate 15 to move back and forth.

[0044] During the back and forth movement of the brush plate 15, the water inlet 24 is intermittently connected to the drain pipe, so that the water in the water tank 16 flows out intermittently to moisten the bristles on the brush plate 15. After the bristles are moistened, the brush plate 15 moves back and forth to clean the surface of the transformer 3 to be inspected;

[0045] S3. The cleaned transformer 3 to be inspected is moved to the lower side of the hot air pipe 12 for drying. The heat generated by the withstand voltage tester 5 during operation is discharged through the thermoelectric cooler 6. The heat-conducting fins 25 and the heat-conducting rods 26 absorb the heat from the ends of the thermoelectric cooler 6. The blower 8 blows the external air into the frame 9. The air absorbs the heat from the heat-conducting fins 25 and the heat-conducting rods 26 and then enters the air supply pipe 11 through the conical cover 10. It is then blown out from the end of the hot air pipe 12 to dry the cleaned transformer 3 to be inspected. At the same time, impurities loosened by the brush plate 15 on the surface of the transformer 3 to be inspected can be blown away.

[0046] S4, the dried transformer 3 to be tested is continuously conveyed forward, the probe 14 contacts the transformer 3 to be tested, and the withstand voltage test of the transformer 3 to be tested is performed. The withstand voltage tester 5 gradually increases the voltage from a low voltage, observes the change trend of the leakage current, and evaluates the insulation state. If the tester detects that the current exceeds the preset threshold, the transformer 3 to be tested has a breakdown. If it does not reach the preset threshold, it indicates that the insulation strength of the transformer 3 to be tested is good. At the same time, the transformer 3 to be tested behind is being cleaned and dried in turn, so that the cleaning, drying and testing work are carried out simultaneously and continuously.

[0047] S5. The above-mentioned work is carried out in sequence to complete the detection of all transformers 3 to be detected.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A transformer insulation withstand voltage testing device, comprising a test bench (1) with a withstand voltage tester (5) provided on the outer wall, characterized in that: The test bench (1) is provided with a conveying roller (2), a transformer to be tested (3) is placed on the conveying roller (2), the withstand voltage tester (5) is connected to a probe (14), a fixed plate (4) is fixedly installed on the test bench (1), a cleaning mechanism for cleaning the transformer to be tested (3) is provided on the fixed plate (4), the cleaning mechanism includes a movable brush plate (15), the brush plate (15) is provided with a water supply mechanism for intermittently draining water to wet the bristles of the brush plate (15), a thermoelectric cooler (6) is fixed on the outer wall of the withstand voltage tester (5), the outer wall of the thermoelectric cooler (6) is provided with a heat conduction mechanism, the heat conduction mechanism includes a blower (8) and a hot air pipe (12) arranged toward the transformer to be tested (3), the heat on the thermoelectric cooler (6) is absorbed by the heat conduction mechanism and blown out from the hot air pipe (12), and the transformer to be tested (3) after being cleaned by the brush plate (15) is dried; The cleaning mechanism further comprises a motor (17) fixed on the fixed plate (4), a driving end of the motor (17) being fixedly connected to a turntable (18), an upper side wall of the turntable (18) being rotatably connected to a connecting rod (19) at a position deviating from the center of a circle, the other end of the connecting rod (19) being rotatably connected to an end of the brush plate (15), a connecting plate (20) being further fixed on the fixed plate (4), a guide plate (21) being fixed to an end of the connecting plate (20), the brush plate (15) being sleeved on an outer wall of the guide plate (21), and an I-shaped groove (22) being provided at a connection between the brush plate (15) and the guide plate (21); The water supply mechanism comprises a water tank (16) fixed to the end of the connecting plate (20), the lower side wall of the water tank (16) is connected to a drain pipe with a closed lower end, the upper side wall of the brush plate (15) is fixed with a right-angle tube (23) whose end is slidably inserted into the drain pipe, the lower side wall of the brush plate (15) is provided with a through opening, the inside of the brush plate (15) is connected to the right-angle tube (23) through a plurality of connecting tubes, the other end of the right-angle tube (23) is closed, and the outer wall of the right-angle tube (23) is provided with a water inlet (24) connected to the inside thereof, and the water inlet (24) is intermittently connected to the drain pipe by the reciprocating movement of the brush plate (15), so that the water in the water tank (16) is intermittently discharged to moisten the bristles on the brush plate (15).

2. A transformer insulation withstand voltage testing device according to claim 1, characterized in that: The heat conduction mechanism includes a frame (9) on the outer wall of the thermoelectric cooler (6), an air inlet tube (7) is installed at the end of the frame (9), the blower (8) is installed at the end of the air inlet tube (7), an air flow distribution plate (31) is fixedly installed in the air inlet tube (7), a heat conduction fin (25) arranged in a grid is fixed in the frame (9), a plurality of evenly distributed heat conduction rods (26) are fixed between the heat conduction fin (25) and the inner wall of the frame (9), the heat on the thermoelectric cooler (6) is adsorbed by the heat conduction fin (25) and the heat conduction rod (26), and the air flow blown into the frame (9) by the blower (8) is heated, the upper side wall of the frame (9) is connected to the air supply pipe (11) through the conical cover (10), and the plurality of hot air pipes (12) are vertically installed at the end of the air supply pipe (11).

3. The transformer insulation withstand voltage testing device according to claim 1, characterized in that: A motor (13) is fixed on the fixing plate (4), and an end of the probe (14) is fixed on a driving end of the motor (13).

4. The transformer insulation withstand voltage testing device according to claim 2, characterized in that: The air supply pipe (11) is provided with a slide groove, a lifting plate (27) is slidably provided in the slide groove, two connecting channels (29) are provided on the lifting plate (27) and are arranged to pass through the lifting plate (27) in a transverse direction, an electric heating wire (30) is arranged inside the connecting channel (29) located on the lower side, an electric push rod (28) is fixed to the outer wall of the air supply pipe (11), and a horizontally arranged connecting block is fixedly connected between the driving end of the electric push rod (28) and the outer wall of the lifting plate (27).

5. A method for using the transformer insulation withstand voltage testing device according to claim 2, characterized in that: The following steps are involved: S1. A plurality of transformers (3) to be inspected are placed on a testing table (1). The transformers (3) to be inspected are driven to move forward intermittently by the rotation of a conveying roller (2), and are cleaned, dried, and inspected in sequence; S2, when performing cleaning work, the transformer to be inspected (3) contacts the bristles of the brush plate (15), the motor (17) is started to drive the turntable (18) and the end of the connecting rod (19) to make a circular motion, and the other end of the connecting rod (19) pulls the brush plate (15) to move back and forth; During the back-and-forth movement of the brush plate (15), the water inlet (24) is intermittently connected to the drain pipe, so that the water in the water tank (16) intermittently flows out to wet the bristles on the brush plate (15). After the bristles are wetted, the brush plate (15) moves back and forth to clean the surface of the transformer (3) to be inspected; S3. The cleaned transformer to be inspected (3) is moved to the lower side of the hot air pipe (12) for drying. The heat generated by the withstand voltage tester (5) during operation is conducted through the thermoelectric cooler (6). The heat-conducting fins (25) and the heat-conducting rods (26) absorb the heat at the end of the thermoelectric cooler (6). The blower (8) blows the external air flow into the frame (9). The air flow absorbs the heat on the heat-conducting fins (25) and the heat-conducting rods (26) and then enters the air supply pipe (11) through the conical cover (10). It is then blown out from the end of the hot air pipe (12) to dry the cleaned transformer to be inspected (3). At the same time, impurities on the surface of the transformer to be inspected (3) that are loosened by the brush plate (15) can be blown away. S4, the transformer to be tested (3) after drying continues to be transported forward, the probe (14) contacts the transformer to be tested (3), and the withstand voltage test of the transformer to be tested (3) is carried out. The withstand voltage tester (5) gradually increases the voltage from a low voltage, observes the change trend of the leakage current, and evaluates the insulation state. If the tester detects that the current exceeds the preset threshold, the transformer to be tested (3) is broken down. If it does not reach the preset threshold, the insulation strength of the transformer to be tested (3) is good. At the same time, the transformer to be tested (3) at the rear is cleaned and dried in turn, so that the cleaning, drying and testing work are carried out simultaneously and continuously. S5. The above-mentioned work is carried out in sequence to complete the inspection of all transformers (3) to be inspected.

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