Transformer withstand voltage test device and test method

Abstract

The present invention belongs to the field of transformer testing technology, and specifically relates to a transformer withstand voltage test device and test method, comprising a base, a fixed frame, an isolation box and a fixed frame, a fire extinguisher is installed in the fixed frame, a voltage regulator is installed in the isolation box, a lifting platform is installed on the base; a cylinder is installed on the fixed frame, an induction table is installed at the output end of the cylinder, and the induction table is connected to the test table through an electromagnetic suction cup; a test probe is installed on the test table, and a sensor group is installed on the induction table. If the transformer catches fire during the pressure maintenance process, the sensor group controls the fire extinguisher to extinguish the transformer. If the fire is small and controllable, the electromagnetic suction cup 2 is powered off, so that the test table is connected to the inclined block 2; the induction table and the test table are controlled by the cylinder to move up and drive the voltage regulating gear to rotate, thereby reducing the voltage of the detection circuit, avoiding direct power failure of the detection circuit, resulting in an instantaneous sudden change in the transformer output voltage, and thus causing additional damage to the transformer under test.

Description

Technical Field

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

[0002] The transformer withstand voltage test device is an important device for testing the insulation performance of the transformer. It is mainly used to evaluate the insulation strength and stability of the transformer under high voltage. When the transformer leaves the factory, it has not been tested for a long time in harsh environments, nor has it been subjected to long-term tests with a power supply of rated voltage and frequency. Therefore, the transformer may have hidden dangers of insulation failure. These hidden dangers are not much different from those of transformers with good insulation performance in terms of no-load current and no-load power consumption, so they are difficult to detect. The withstand voltage test device applies a voltage of more than twice the rated voltage to the transformer, establishing a higher and more concentrated field strength at the longitudinal insulation defect, so that the voltage between winding turns, layers and segments reaches and exceeds the breakdown voltage at the dielectric defect, thereby reliably testing the longitudinal insulation performance of the transformer.

[0003] When testing a transformer, it is necessary to connect the transformer to the test circuit, then adjust the voltage regulator to increase the voltage; when the test voltage reaches the set value, keep the voltage stable, and start timing until the withstand voltage test is completed.

[0004] If the transformer catches fire or emits smoke during the pressure maintenance process, it is necessary to immediately disconnect the transformer from the power supply. For example, in patent publication number CN118818378A, when the transformer catches fire during the pressure maintenance process, the rebound control component is used to quickly separate the test equipment from the transformer. However, due to the high voltage of the test circuit, directly disconnecting the power supply may cause the output voltage of the test transformer to suddenly change, resulting in a high operating overvoltage, causing additional damage to the transformer under test. Summary of the Invention

[0005] The purpose of the present invention is to provide a transformer withstand voltage test device and a test method to solve the technical problems in the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions: a transformer withstand voltage test device, which includes a base, a fixing frame is installed on the base, an isolation box and a fixing frame are installed in the fixing frame, the fixing frame is located at the bottom of the isolation box, a fire extinguisher is installed in the fixing frame, a voltage regulator is installed in the isolation box, and a lifting platform is installed on the base; a cylinder is installed on the fixing frame, an induction table is installed at the output end of the cylinder, the induction table is connected to the test table through an electromagnetic suction cup 1, the test table is located on the top of the induction table, and the test table is connected to the fixing frame through a spring 2; a test probe is installed on the test table , a sensor group is installed on the sensing table; a side panel is installed on the isolation box, a voltage regulating gear is installed on the voltage regulator, a baffle is installed on the side panel, a longitudinal slide groove is provided on the isolation box and the baffle, a rack is slidably installed in the longitudinal slide groove on the isolation box, and a ramp block 1 is slidably installed in the longitudinal slide groove on the baffle, the rack and the ramp block 1 are abutted by the inclined surface, the rack and the voltage regulating gear are detachably connected, a ramp block 2 is installed on the ramp block 1; the test bench abuts against the ramp block 2, and the test bench can also be connected to the ramp block 2; a push-type switch is installed on the top of the test bench.

[0007] As a further optimization or improvement of this solution, side panels are installed on the isolation box, side slide grooves are provided on the side panels, and the test bench is slidably engaged with the side slide grooves.

[0008] As a further optimization or improvement of this solution, a guide bar is installed on the inclined surface of the rack, and a guide groove is provided on the inclined surface of the inclined surface block 1, and the guide groove is slidably connected to the guide bar.

[0009] As a further optimization or improvement of this solution, a pressure plate is installed for transverse sliding in the longitudinal slide groove, and the pressure plate is connected to the inner wall of the isolation box through a spring.

[0010] As a further optimization or improvement of this solution, a horizontal slide groove is provided on the side wall of the test bench, and an insert block is slidably installed in the horizontal slide groove. The insert block is connected to the test bench through spring 1, a metal plate is installed on the insert block, and an electromagnetic suction cup 2 is installed at the bottom of the horizontal slide groove, and the electromagnetic suction cup 2 adsorbs the metal plate; a card slot is provided on the inclined block 2, and the test bench is connected to the inclined block 2 by inserting the insert block into the card slot.

[0011] As a further optimization or improvement of this solution, the sensor group includes a smoke sensor and a flame sensor.

[0012] A transformer withstand voltage test method is applied to the transformer withstand voltage test device as described above, and the method comprises the following steps:

[0013] Step S1: The transformer is fixedly placed on a lifting platform, and the induction platform and the test platform are driven downward synchronously by a cylinder, so that the test probe is connected to the transformer, and the voltage is increased by adjusting the voltage regulator;

[0014] Step S2: When the test voltage reaches the set value, the voltage is kept stable and timing is started until the withstand voltage test is completed;

[0015] Step S3: During the downward movement of the sensing table and the test table, the test table pushes the second and first bevel blocks outward by cooperating with the inclined surface on the side wall of the test table, so that the first bevel block moves closer to the rack. The inclined surface on the rack cooperates with the first bevel block, so that the first bevel block pushes the tooth surface of the rack to move closer to the pressure regulating gear and meshes with the pressure regulating gear.

[0016] Step S4: If the transformer catches fire during the pressure maintenance process, the flame sensor in the sensor group detects the flame and controls the activation of the fire extinguisher, which extinguishes the fire in the transformer;

[0017] Step S5: The sensor group detects the fire intensity. If the fire is small and controllable, the electromagnetic chuck 2 is powered off. At this time, the insert block is inserted into the slot under the rebound action of the spring 1, connecting the test platform and the inclined block 2. The cylinder controls the induction platform and the test platform to move upward. At the same time, the lifting platform lifts the transformer, so that the transformer moves upward at the same speed as the induction platform and the test platform.

[0018] Step S6: As the test bench moves upward, the rack is driven to move synchronously by the inclined plane block 1. Under the action of the meshing of the rack and the voltage-regulating gear, the upward movement of the test bench drives the voltage-regulating gear to rotate, thereby reducing the voltage of the detection circuit until the push-type switch on the top of the test bench contacts the fixed frame, and the detection circuit is powered off.

[0019] Step S7: Reset the transformer by controlling the lifting platform to disconnect the transformer from the test probe.

[0020] Beneficial effects of the present invention:

[0021] (1) If the transformer catches fire during the pressure maintenance process, the sensor group controls the fire extinguisher to extinguish the transformer. During this process, if the fire is small and controllable, the power is cut off through the electromagnetic suction cup 2, and the test bench is connected to the inclined block 2.

[0022] Specifically, the induction table and the test table are controlled to move upward by a cylinder, and at the same time, the lifting platform lifts the transformer, so that the transformer moves upward at the same speed as the induction table and the test table; during the process of the test table moving upward, the test table drives the rack to move synchronously through the inclined block, so that the rack drives the voltage-regulating gear to rotate, thereby reducing the voltage of the detection circuit until the push-type switch on the top of the test table contacts the fixed frame, and the detection circuit is powered off, avoiding direct power outage of the detection circuit, resulting in an instantaneous sudden change in the transformer output voltage, and thus causing additional damage to the transformer under test. During the process of reducing the voltage and cutting off the power, the lifting platform lifts the transformer to isolate the transformer from the ground, which can reduce the risk of electric shock caused by a wet ground.

[0023] (2) If the transformer catches fire during the pressure maintenance process, and the fire is large, the present invention energizes the electromagnetic suction cup 2, causing the plug block to disengage from the slot and slide into the horizontal slide groove, disconnecting the test bench from the inclined block 2; the electromagnetic suction cup 1 is de-energized, disconnecting the induction table from the test bench. The test bench quickly moves upward under the action of the spring 2, and when the push-type switch on the top of the test bench contacts the fixed frame, the detection circuit is de-energized. When the fire is large, the present invention skips the circuit voltage reduction process and directly de-energizes the detection circuit, avoiding high voltage combustion and preventing the fire from further spreading due to the live electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a front view of the overall structure of the present invention.

[0027] Figure 3 Schematic diagram of the installation location of the sensor group and test probe.

[0028] Figure 4 It is a cross-sectional view of the overall structure of the present invention.

[0029] Figure 5 for Figure 4 A magnified view of the structure of part A.

[0030] Figure 6 This is a schematic diagram of the baffle installation position.

[0031] Figure 7 Schematic diagram of the installation position of the rack and the ramp block.

[0032] Figure 8 It is a schematic diagram of the connection structure between the rack and the inclined plane block.

[0033] Figure 9 This is a structural diagram of the pressure plate installation position.

[0034] Figure 10 for Figure 4 A magnified view of the structure of part B.

[0035] Figure 11 Schematic diagram of the sliding connection between the test bench and the side slide.

[0036] The following are marked in the figure: 1. Base; 2. Fixing frame; 3. Cylinder; 4. Isolation box; 5. Fixing frame; 6. Lifting platform; 7. Fire extinguisher; 8. Side panel; 9. Spring 2; 10. Voltage regulator; 11. Voltage regulating gear; 12. Side slide; 13. Longitudinal slide; 14. Rack; 15. Inclined block 1; 16. Baffle; 17. Inclined block 2; 18. Slot; 19. Guide groove; 20. Guide bar; 21. Pressure plate; 22. Induction table; 23. Test table; 24. Sensor group; 25. Electromagnetic chuck 1; 26. Spring 1; 27. Test probe; 28. Electromagnetic chuck 2; 29. ​​Metal plate; 30. Push switch; 31. Horizontal slide; 32. Insert block. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0038] See also Figures 1-11 A transformer withstand voltage test device, which includes a base 1, a fixing frame 2 is installed on the base 1, an isolation box 4 and a fixing frame 5 are installed in the fixing frame 2, the fixing frame 5 is located at the bottom of the isolation box 4, a fire extinguisher 7 is installed in the fixing frame 5, and a voltage regulator 10 is installed in the isolation box 4. A lifting platform 6 is installed on the base 1; a cylinder 3 is installed on the fixing frame 2, and a sensing table 22 is installed at the output end of the cylinder 3. The sensing table 22 is connected to the test table 23 through an electromagnetic suction cup 25. The test table 23 is located on the top of the sensing table 22, and the test table 23 is connected to the fixing frame 2 through a spring 9; a test probe 27 is installed on the test table 23, and a sensor group 24 is installed on the sensing table 22; A side plate 8 is installed on the isolation box 4, a pressure regulating gear 11 is installed on the pressure regulator 10, and a baffle 16 is installed on the side plate 8. A longitudinal groove 13 is provided on the isolation box 4 and the baffle 16. A rack 14 is slidably installed in the longitudinal groove 13 on the isolation box 4, and a bevel block 15 is slidably installed in the longitudinal groove 13 on the baffle 16. The rack 14 and the bevel block 15 are abutted by the bevel, and the rack 14 is detachably connected to the pressure regulating gear 11. A bevel block 2 17 is installed on the bevel block 15; the test bench 23 abuts against the bevel block 2 17, and the test bench 23 can also be connected to the bevel block 2 17; a push-type switch 30 is installed on the top of the test bench 23.

[0039] Specifically, a side plate 8 is installed on the isolation box 4 , a side slide groove 12 is provided on the side plate 8 , and the test bench 23 is slidably matched with the side slide groove 12 .

[0040] Specifically, the sensor group 24 includes a smoke sensor and a flame sensor.

[0041] It should be noted that an electromagnetic chuck 1 25 is installed on the induction table 22. In the initial state, the electromagnetic chuck 1 25 is energized, and the induction table 22 is connected to the test table 23 via the electromagnetic chuck 1 25. The side wall of the test table 23 is provided with an inclined surface. By cooperating with the inclined surface block 2 17, the test table 23 moves downward, pushing the inclined surface block 2 17 and the inclined surface block 15 to move. The side of the rack 14 near the inclined surface block 15 is also provided with an inclined surface. By cooperating with the inclined surface on the rack 14 and the inclined surface block 15, the inclined surface 15 pushes the tooth surface of the rack 14 toward the pressure regulating gear 11 and meshes with the pressure regulating gear 11. During this process, the inclined surface block 15 and the rack 14 slide together through the guide groove 19 and the guide bar 20 to achieve the connection between the inclined surface block 15 and the rack 14.

[0042] When in use, the present invention needs to place the transformer on the lifting platform 6, and the cylinder 3 drives the induction platform 22 and the test platform 23 to move downward synchronously, so that the test probe 27 is connected to the transformer, and the voltage is increased by adjusting the voltage regulator 10; when the test voltage reaches the set value, the voltage is kept stable, and the timing is started until the withstand voltage test is completed.

[0043] During the downward movement of the sensing table 22 and the test table 23, the test table 23 pushes the inclined surface block 2 17 and the inclined surface block 1 15 outward through the cooperation between the inclined surface on the side wall of the test table 23 and the inclined surface block 2 17, so that the inclined surface block 15 moves close to the direction of the rack 14. The inclined surface on the rack 14 cooperates with the inclined surface block 15, so that the inclined surface block 15 pushes the tooth surface of the rack 14 to move close to the direction of the pressure regulating gear 11 and engages with the pressure regulating gear 11. In this process, the inclined surface block 15 and the rack 14 are connected by the sliding cooperation of the guide groove 19 and the guide bar 20.

[0044] The sensor assembly 24 of the present invention is used to detect whether the transformer is on fire or emitting smoke. If the transformer catches fire during the pressure-maintaining process, the flame sensor in the sensor assembly 24 detects the flame and activates the fire extinguisher 7, which extinguishes the transformer. During this process, the sensor assembly 24 monitors the intensity of the fire. If the fire is small and controllable, the electromagnetic chuck 28 is de-energized. At this time, the insert 32, under the rebound action of the spring 1 26, is inserted into the slot 18, connecting the test bench 23 to the inclined block 2 17.

[0045] The induction table 22 and the test table 23 are controlled to move upward by the cylinder 3, while the lifting platform 6 lifts the transformer so that the transformer moves upward at the same speed as the induction table 22 and the test table 23. During this process, the transformer is connected to the test probe 27. During the upward movement of the test table 23, the test table 23 drives the rack 14 to move synchronously through the inclined block 15. Under the action of the engagement between the rack 14 and the voltage regulating gear 11, the upward movement of the test table 23 drives the voltage regulating gear 11 to rotate, thereby reducing the voltage of the detection circuit until the push-type switch 30 at the top of the test table 23 contacts the fixed frame 2, and the detection circuit is powered off. The transformer is reset by the lifting platform 6 to disconnect the transformer from the test probe 27, avoiding direct power outage of the detection circuit, resulting in a sudden change in the transformer output voltage, and thus causing additional damage to the transformer under test. During the process of reducing the voltage and shutting off the power, the lifting platform 6 lifts the transformer to isolate the transformer from the ground, which can reduce the risk of electric shock caused by moisture or conductivity of the ground.

[0046] When the smoke sensor in the sensor group 24 detects smoke from the transformer but no fire occurs, the pressure reduction and power-off operation is the same as described above.

[0047] See also Figure 4-Figure 8 The side wall of the test bench 23 is provided with a horizontal sliding groove 31, and an insert block 32 is slidably installed in the horizontal sliding groove 31. The insert block 32 is connected to the test bench 23 through a spring 1 26. A metal plate 29 is installed on the insert block 32, and an electromagnetic suction cup 28 is installed at the bottom of the horizontal sliding groove 31. The electromagnetic suction cup 28 adsorbs the metal plate 29; a card slot 18 is provided on the inclined plane block 2 17, and the test bench 23 is connected to the inclined plane block 2 17 by inserting the insert block 32 into the card slot 18.

[0048] It should be noted that if the transformer catches fire during the pressure maintenance process, and the fire is large, then the transformer may have insulation breakdown or winding short circuit, causing the arc to continue burning. In the energized state, the arc will continue to release energy, exacerbating the fire, so it is necessary to urgently cut off the power to the detection circuit. Figure 5 The metal plate 29 moves toward the electromagnetic chuck 28, causing the insert 32 to disengage from the slot 18 and slide into the horizontal slot 31, disconnecting the test platform 23 from the inclined block 2 17. The electromagnetic chuck 1 25 is then de-energized, disconnecting the induction platform 22 from the test platform 23. At this point, spring 29 resets, and the test platform 23 rapidly moves upward under its action. When the push-type switch 30 on top of the test platform 23 contacts the fixed frame 2, the detection circuit is de-energized. When the fire is large, the present invention skips the circuit voltage reduction process and directly de-energizes the detection circuit, preventing high voltage from fueling combustion and preventing the fire from spreading further due to the live electricity.

[0049] See also Figure 4-Figure 8A guide bar 20 is installed on the inclined surface of the rack 14, and a guide groove 19 is provided on the inclined surface of the inclined surface block 15, and the guide groove 19 is slidably connected to the guide bar 20.

[0050] The side wall of the test table 23 is set with a slope. The slope on the test table 23 cooperates with the slope block 2 17, so that the test table 23 moves downward to push the slope block 2 17 and the slope block 1 15 to move; the side of the rack 14 close to the slope block 15 is set with a slope. The slope on the rack 14 cooperates with the slope block 15, so that the slope block 15 pushes the tooth surface of the rack 14 to move close to the pressure regulating gear 11 and engage with the pressure regulating gear 11. In this process, the slope block 15 and the rack 14 are connected by the sliding cooperation of the guide groove 19 and the guide bar 20 to realize the connection between the slope block 15 and the rack 14.

[0051] See also Figure 9 A pressure plate 21 is installed in a transverse sliding manner in the longitudinal slide groove 13, and the pressure plate 21 is connected to the inner wall of the isolation box 4 through a spring.

[0052] It should be noted that the pressure plate 21 presses the rack 14 by the action of the spring, so that the rack 14 is separated from the pressure-adjusting gear 11 in the initial state.

[0053] See also Figures 4-10 As shown, the present invention is a transformer withstand voltage test method, which is applied to the transformer withstand voltage test device as described in the above embodiment, and the method includes the following steps:

[0054] Step S1: The transformer is fixedly placed on the lifting platform 6, and the induction platform 22 and the test platform 23 are driven downward synchronously by the cylinder 3, so that the test probe 27 is connected to the transformer, and the voltage is increased by adjusting the voltage regulator 10;

[0055] Step S2: When the test voltage reaches the set value, the voltage is kept stable and timing is started until the withstand voltage test is completed;

[0056] Step S3: During the downward movement of the sensing table 22 and the testing table 23, the inclined surface on the side wall of the testing table 23 cooperates with the inclined surface block 2 17, so that the testing table 23 pushes the inclined surface block 2 17 and the inclined surface block 1 15 to move outward, causing the inclined surface block 15 to move closer to the rack 14. The inclined surface on the rack 14 cooperates with the inclined surface block 15, so that the inclined surface block 15 pushes the tooth surface of the rack 14 to move closer to the pressure regulating gear 11 and mesh with the pressure regulating gear 11.

[0057] Step S4: If the transformer catches fire during the pressure maintenance process, the flame sensor in the sensor group 24 detects the flame and controls the activation of the fire extinguisher 7, which extinguishes the fire in the transformer;

[0058] Step S5: The sensor group 24 detects the fire intensity. If the fire is small and controllable, the electromagnetic chuck 28 is de-energized. At this time, the insert block 32 is inserted into the slot 18 under the rebound action of the spring 1 26, so that the test platform 23 is connected to the inclined block 2 17. The cylinder 3 controls the upward movement of the sensing platform 22 and the test platform 23. At the same time, the lifting platform 6 lifts the transformer, so that the transformer moves upward at the same speed as the sensing platform 22 and the test platform 23.

[0059] Step S6: As the test platform 23 moves upward, the test platform 23 drives the rack 14 to move synchronously via the inclined block 15. As the rack 14 meshes with the voltage-regulating gear 11, the upward movement of the test platform 23 drives the voltage-regulating gear 11 to rotate, thereby reducing the voltage in the detection circuit. This is achieved by contacting the push-type switch 30 on the top of the test platform 23 with the fixing frame 2, de-energizing the detection circuit.

[0060] Step S7 : The transformer is reset by controlling the lifting platform 6 to disconnect the transformer from the test probe 27 .

[0061] The implementation principle of the present invention is as follows: the transformer is fixedly placed on the lifting platform 6, the induction platform 22 and the test platform 23 are driven downward synchronously by the cylinder 3, the test probe 27 is connected to the transformer, and the voltage is increased by adjusting the voltage regulator 10; when the test voltage reaches the set value, the voltage is kept stable, and the timing is started until the withstand voltage test is completed.

[0062] During the downward movement of the sensing table 22 and the test table 23, the test table 23 pushes the inclined surface block 2 17 and the inclined surface block 1 15 outward through the cooperation between the inclined surface on the side wall of the test table 23 and the inclined surface block 2 17, so that the inclined surface block 15 moves close to the direction of the rack 14. The inclined surface on the rack 14 cooperates with the inclined surface block 15, so that the inclined surface block 15 pushes the tooth surface of the rack 14 to move close to the direction of the pressure regulating gear 11 and engages with the pressure regulating gear 11. In this process, the inclined surface block 15 and the rack 14 are connected by the sliding cooperation of the guide groove 19 and the guide bar 20.

[0063] Specifically, the sensor group 24 can detect whether the transformer is on fire or emitting smoke; if the transformer catches fire during the pressure maintenance process, the flame sensor in the sensor group 24 detects the flame and controls the activation of the fire extinguisher 7, which extinguishes the fire in the transformer. During this process, the sensor group 24 detects the fire intensity. If the fire is small and controllable, the electromagnetic suction cup 28 is powered off. At this time, the plug block 32 is inserted into the slot 18 under the rebound action of the spring 1 26, so that the test bench 23 is connected to the inclined block 2 17.

[0064] The induction table 22 and the test table 23 are controlled to move upward by the cylinder 3, while the lifting platform 6 lifts the transformer so that the transformer moves upward at the same speed as the induction table 22 and the test table 23. During this process, the transformer is connected to the test probe 27. During the upward movement of the test table 23, the test table 23 drives the rack 14 to move synchronously through the inclined block 15. Under the action of the engagement between the rack 14 and the voltage regulating gear 11, the upward movement of the test table 23 drives the voltage regulating gear 11 to rotate, thereby reducing the voltage of the detection circuit until the push-type switch 30 at the top of the test table 23 contacts the fixed frame 2, and the detection circuit is powered off. The transformer is reset by the lifting platform 6 to disconnect the transformer from the test probe 27, avoiding direct power outage of the detection circuit, resulting in a sudden change in the transformer output voltage, and thus causing additional damage to the transformer under test. During the process of reducing the voltage and shutting off the power, the lifting platform 6 lifts the transformer to isolate the transformer from the ground, which can reduce the risk of electric shock caused by moisture or conductivity of the ground.

[0065] If the transformer catches fire during the pressure maintenance process, and the fire is large, the transformer may have insulation breakdown or winding short circuit, causing the arc to continue burning. In the energized state, the arc will continue to release energy, exacerbating the fire, so it is necessary to urgently cut off the power to the detection circuit. Figure 5 The metal plate 29 moves toward the electromagnetic chuck 28, causing the insert 32 to disengage from the slot 18 and slide into the horizontal slot 31, disconnecting the test platform 23 from the inclined block 2 17. The electromagnetic chuck 1 25 is then de-energized, disconnecting the induction platform 22 from the test platform 23. At this point, spring 29 resets, and the test platform 23 rapidly moves upward under its action. When the push-type switch 30 on top of the test platform 23 contacts the fixed frame 2, the detection circuit is de-energized. When the fire is large, the present invention skips the circuit voltage reduction process and directly de-energizes the detection circuit, preventing high voltage from fueling combustion and preventing the fire from spreading further due to the live electricity.

[0066] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A transformer withstand voltage test device, characterized in that: It comprises a base (1), a fixing frame (2) is mounted on the base (1), an isolation box (4) and a fixing frame (5) are mounted in the fixing frame (2), the fixing frame (5) is located at the bottom of the isolation box (4), a fire extinguisher (7) is mounted in the fixing frame (5), a voltage regulator (10) is mounted in the isolation box (4), and a lifting platform (6) is mounted on the base (1); The cylinder (3) is installed on the fixed frame (2), the induction table (22) is installed on the output end of the cylinder (3), the induction table (22) is connected to the test table (23) through the electromagnetic suction cup (25), the test table (23) is located on the top of the induction table (22), and the test table (23) is connected to the fixed frame (2) through the spring (9); the test probe (27) is installed on the test table (23), and the sensor group (24) is installed on the induction table (22); A side plate (8) is installed on the isolation box (4), a pressure regulating gear (11) is installed on the pressure regulator (10), a baffle (16) is installed on the side plate (8), a longitudinal slide groove (13) is provided on the isolation box (4) and the baffle (16), a rack (14) is slidably installed in the longitudinal slide groove (13) on the isolation box (4), and a bevel block 1 (15) is slidably installed in the longitudinal slide groove (13) on the baffle (16), the rack (14) and the bevel block 1 (15) are abutted by an inclined surface, the rack (14) and the pressure regulating gear (11) are detachably connected, and a bevel block 2 (17) is installed on the bevel block 1 (15); the test bench (23) abuts against the bevel block 2 (17), and the test bench (23) can also be connected to the bevel block 2 (17); a push-type switch (30) is installed on the top of the test bench (23); The side wall of the test bench (23) is provided with a transverse sliding groove (31), an insert block (32) is slidably installed in the transverse sliding groove (31), the insert block (32) is connected to the test bench (23) through a spring (26), a metal plate (29) is installed on the insert block (32), and an electromagnetic suction cup (28) is installed at the bottom of the transverse sliding groove (31), and the electromagnetic suction cup (28) adsorbs the metal plate (29); a slot (18) is provided on the inclined plane block (17), and the test bench (23) is connected to the inclined plane block (17) by inserting the insert block (32) into the slot (18).

2. A transformer withstand voltage test device according to claim 1, characterized in that: A side plate (8) is installed on the isolation box (4), a side slide groove (12) is provided on the side plate (8), and the test bench (23) is slidably engaged with the side slide groove (12).

3. The transformer withstand voltage test device according to claim 1, characterized in that: A guide bar (20) is installed on the inclined surface of the rack (14), and a guide groove (19) is provided on the inclined surface of the inclined surface block (15), and the guide groove (19) is slidably connected to the guide bar (20).

4. The transformer withstand voltage test device according to claim 1, characterized in that: A pressure plate (21) is installed in a transverse sliding manner in the longitudinal slide groove (13), and the pressure plate (21) is connected to the inner wall of the isolation box (4) via a spring.

5. The transformer withstand voltage test device according to claim 1, characterized in that: The sensor group (24) includes a smoke sensor and a flame sensor.

6. A transformer withstand voltage test method, characterized in that: The method is applied to the transformer withstand voltage test device according to any one of claims 1 to 5, and the method comprises the following steps: Step S1: The transformer is fixedly placed on the lifting platform (6), and the induction platform (22) and the test platform (23) are driven downward synchronously by the cylinder (3), so that the test probe (27) is connected to the transformer, and the voltage is increased by adjusting the voltage regulator (10); Step S2: When the test voltage reaches the set value, the voltage is kept stable and timing is started until the withstand voltage test is completed; Step S3: During the downward movement of the sensing table (22) and the test table (23), the test table (23) pushes the bevel block 2 (17) and the bevel block 1 (15) outward by cooperating with the bevel on the side wall of the test table (23), so that the bevel block 1 (15) moves toward the direction of the rack (14), and the bevel on the rack (14) cooperates with the bevel block 1 (15), so that the bevel block 1 (15) pushes the tooth surface of the rack (14) toward the direction of the pressure regulating gear (11) and meshes with the pressure regulating gear (11); Step S4: If the transformer catches fire during the pressure maintenance process, the flame sensor in the sensor group (24) detects the flame and controls the activation of the fire extinguisher (7), and the fire extinguisher (7) extinguishes the fire in the transformer; Step S5: The sensor group (24) detects the fire. If the fire is small and controllable, the electromagnetic chuck (28) is powered off. At this time, the plug (32) is inserted into the slot (18) under the rebound action of the spring (26), so that the test table (23) is connected to the inclined block (17). The cylinder (3) controls the induction table (22) and the test table (23) to move upward. At the same time, the lifting platform (6) lifts the transformer so that the transformer moves upward at the same speed as the induction table (22) and the test table (23). Step S6: During the upward movement of the test bench (23), the test bench (23) drives the rack (14) to move synchronously via the inclined block 1 (15). Under the action of the meshing of the rack (14) and the voltage regulating gear (11), the upward movement of the test bench (23) drives the voltage regulating gear (11) to rotate, thereby reducing the voltage of the detection circuit until the push-type switch (30) on the top of the test bench (23) contacts the fixing frame (2), and the detection circuit is powered off. Step S7: The transformer is reset by controlling the lifting platform (6) to disconnect the transformer from the test probe (27).

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