Testing device of power transformer

Abstract

The invention discloses a test device for a power transformer, and belongs to the technical field of power transformers, the test device comprises a main body module and a test module, the main body module comprises a device main body, the top of the inner wall of the device main body is fixedly connected with a test port, and the device main body is internally provided with an adjusting cavity; a resistance tube is arranged between the top and the bottom of the inner wall of the adjusting cavity, and through the arrangement of a lifting assembly, a connecting assembly, a linkage transmission assembly, a T-shaped block, an equidistant adjusting assembly, an isosceles trapezoid block and a touch button, the defect that a continuous voltage adjusting mode is difficult to adapt to a standardized test process in the prior art is effectively overcome; according to the invention, the distance between the plurality of isosceles trapezoid blocks is adjusted through the equidistant adjusting assembly, thereby achieving the flexible presetting of the test voltage gradient, meeting the different demands of different transformers for the test step length, thoroughly eliminating the uncertainty caused by manual operation, and remarkably improving the standardization and intelligentization level of the test.

Description

Technical Field

[0001] This invention relates to the field of power transformer technology, and more specifically, to a testing apparatus for power transformers. Background Technology

[0002] As a core device in the power grid for voltage transformation, power distribution, and transmission, the operational reliability of power transformers directly affects the stability and security of the entire power system. To ensure their performance, a series of rigorous tests are required; therefore, testing equipment is needed to test power transformers.

[0003] According to the search, patent CN116736056B discloses an external withstand voltage test device for power transformers. The upper end of the base is connected to an adjustment device, which includes a housing, a resistance tube, a transmission mechanism, and a power mechanism. The housing is fixedly connected to one side of the upper end of the base. A sliding groove is formed inside the housing, and a resistance tube is fixedly connected within the groove. Four slide rails are provided on the outer side of the resistance tube. A slider is slidably fitted within the groove and onto the slide rails. Beneficial effects: The power mechanism drives the transmission mechanism, causing the slider to slide, which in turn causes a lever to slide against the outer wall of the resistance tube, changing the resistance value and thus controlling the voltage increase applied to the transformer by the test device. The slide rails improve the stability of the slider during sliding, making the test more accurate. The elastic mechanism pushes the lever to ensure it is tightly against the resistance tube.

[0004] Regarding the aforementioned technologies, the existing continuous smooth voltage regulation method, which is commonly used, reveals its inherent technical rigidity when faced with a wide variety of transformers with different testing requirements. Taking the patent with authorization announcement number CN116736056B as an example, its core uses a sliding rheostat to achieve continuous voltage regulation. Although this solution can achieve basic voltage regulation, its continuous and unpreset adjustment mode itself makes it difficult to adapt to standardized testing procedures. Specifically, different transformer test procedures have clear requirements for the voltage gradient applied, which may require a fine step of 0.1kV to capture the onset of partial discharge, or a large step of 1.0kV to quickly complete the withstand voltage screening. The existing device represented by CN116736056B lacks support for "discrete detection gradient" in its hardware structure and control logic. It cannot preset these different voltage steps and sequences before performing the test. This results in the test device only being able to operate in a unified, non-standardized continuous test mode when dealing with diverse test tasks, and it cannot intelligently switch to the optimal detection gradient according to the type of transformer under test and the test standard. Therefore, a test device for power transformers is proposed. Summary of the Invention

[0005] To address the above problems, the present invention provides a testing device for power transformers, employing the following technical solution: A testing device for a power transformer includes a main module and a testing module. The main module includes a device body with a test port fixedly connected to the top of its inner wall. An adjustment cavity is formed inside the device body, and a resistance tube is disposed between the top and bottom of the inner wall of the adjustment cavity. The testing module includes a lifting assembly disposed between the top and bottom of the inner wall of the adjustment cavity. A connecting assembly and a connecting transmission assembly are connected to the lifting assembly. The connecting transmission assembly is connected to the connecting assembly, and the connecting assembly is electrically connected to the test port. The connecting assembly is located outside the resistance tube. A T-shaped block is connected to the front end face of the inner wall of the adjustment cavity. An equidistant adjustment assembly is disposed on the T-shaped block, and multiple isosceles trapezoidal blocks are disposed on the equidistant adjustment assembly. A safety assembly is disposed on one side of the inner wall of the adjustment cavity. The safety assembly and the multiple isosceles trapezoidal blocks are adapted to the connecting transmission assembly. A touch button electrically connected to the lifting assembly is disposed on the lifting assembly, and a numerical slot is formed on the T-shaped block.

[0006] Furthermore, the equidistant adjustment component includes a longitudinal groove formed on the rear end face of the T-shaped block, a plurality of sliding seats are slidably connected inside the longitudinal groove, a plurality of isosceles trapezoidal blocks are respectively fixedly connected to the rear end faces of the plurality of sliding seats, a scissor lift is movably connected between the outer surfaces of the plurality of sliding seats, and two transmission blocks are movably connected to one end of the scissor lift.

[0007] Furthermore, the equidistant adjustment assembly also includes a transverse groove formed on the T-shaped block, with two transmission blocks slidably connected inside the transverse groove. A bidirectional screw is rotatably connected between the two sides of the inner wall of the transverse groove, and both transmission blocks are threadedly connected to the outer surface of the bidirectional screw. A pointer is fixedly connected to the front end face of both transmission blocks, and both pointers are located behind the numerical groove. A second motor is mounted on the T-shaped block, and the output shaft of the second motor is fixedly connected to one end of the bidirectional screw.

[0008] Furthermore, the connecting assembly includes a U-shaped connecting block electrically connected to the test port. Two steering shafts are rotatably connected between the top and bottom of the inner wall of the U-shaped connecting block. Connecting pieces are rotatably connected to the outer surfaces of the two steering shafts. Torsion springs are fixedly connected between the top of the two connecting pieces and the outer surfaces of the two steering shafts.

[0009] Furthermore, the connecting assembly also includes a longitudinal rod disposed inside the lifting assembly. A connecting gear is fixedly connected to the outer surface of the longitudinal rod, and an insulating connecting gear is fixedly connected to the outer surface of each of the two steering shafts. The outer surfaces of the two insulating connecting gears mesh with each other, and the outer surface of the connecting gear meshes with the outer surface of one of the insulating connecting gears.

[0010] Furthermore, the lifting assembly includes a first lifting screw rotatably connected between the top and bottom of the inner wall of the adjustment cavity, a slide rail fixedly connected to one side of the inner wall of the adjustment cavity, an insulating slider threadedly connected to the outer surface of the first lifting screw, the insulating slider slidably connected to the outer surface of the slide rail, a longitudinal rod rotatably connected inside the insulating slider, a first motor fixedly connected to one side of the main body of the device, the output shaft of the first motor extending into the interior of the adjustment cavity, bevel gears fixedly connected to both the output shaft of the first motor and the outer surface of the first lifting screw, the outer surfaces of the two bevel gears meshing with each other, and a U-shaped connecting block fixedly connected to one side of the insulating slider.

[0011] Furthermore, the connecting transmission assembly includes a mounting sleeve fixedly connected inside the insulating slider. A rack rod that meshes with a connecting gear is movably connected inside the mounting sleeve. A first spring is fixedly connected between one end of the rack rod and the inside of the mounting sleeve. A movable frame is fixedly connected to the other end of the rack rod. A sliding block is slidably connected inside the movable frame. A roller is mounted on the outer surface of the sliding block. A second spring is fixedly connected between the outer surface of the sliding block and one side of the inner wall of the movable frame. A steering press rod is fixedly connected to the outer surface of the rack rod. One end of the steering press rod is located directly in front of the touch button.

[0012] Furthermore, the connecting transmission assembly also includes a movable rod fixedly connected to the other side of the sliding block. One end of the movable rod extends to the outside of the movable frame and is fixedly connected to a mounting base, on which a ball bearing is movably connected.

[0013] Furthermore, the safety component includes a mounting frame fixedly connected to one side of the inner wall of the adjustment cavity. A second lifting screw is rotatably connected between the top and bottom of the inner wall of the mounting frame. A lifting seat is slidably connected inside the mounting frame. The interior of the lifting seat is threadedly connected to the outer surface of the second lifting screw. A third motor is fixedly connected to the top of the mounting frame. The output shaft of the third motor is fixedly connected to the top end of the second lifting screw. Two connecting rods are fixedly connected to the outer surface of the lifting seat. A right-angled trapezoidal block is fixedly connected between one end of the two connecting rods. The right-angled trapezoidal block is located on one side of the mounting frame. One side of the mounting frame is in contact with the outer surface of the ball bearing.

[0014] Furthermore, the main module includes a protective shell fixedly connected to the top of the device body, the top of the T-shaped block is located inside the protective shell, and an adjustment door is provided on the front end face of the device body, the adjustment door being located directly in front of the numerical slot.

[0015] In summary, the present invention has the following beneficial technical effects: (1) By setting up lifting components, connecting components, connecting transmission components, T-blocks, equidistant adjustment components, isosceles trapezoidal blocks and touch buttons, the present invention effectively overcomes the defect that the continuous voltage regulation mode in the prior art is difficult to adapt to the standardized test process. By adjusting the spacing of multiple isosceles trapezoidal blocks through the equidistant adjustment components, the test voltage gradient can be flexibly preset, which meets the different requirements of different transformers for the test step length. The coordinated work of the connecting transmission components and the isosceles trapezoidal blocks ensures that the standardized process of contact, energization, voltage holding test and disconnection can be automatically completed at each preset voltage point, completely eliminating the uncertainty brought about by manual operation, making the test data have strict reliability and comparability, and significantly improving the standardization and intelligence level of the test.

[0016] (2) This invention solves the problem of the lack of a safe upper limit setting for the test voltage in existing devices by setting a second lifting screw, a right-angled trapezoidal block, a ball bearing, a sliding block, and a movable frame. A third motor drives the second lifting screw to raise and lower the right-angled trapezoidal block to a specified height, thereby setting the test termination position. When the ball bearing rises with the connecting transmission assembly and contacts the right-angled trapezoidal block, the sliding block and the movable frame shift, causing the roller to disengage from the contact path with the subsequent isosceles trapezoidal block, automatically terminating the test process. This purely mechanical structure achieves forced power-off at the preset voltage threshold, providing a reliable safety guarantee mechanism for transformer testing and preventing equipment risks caused by overvoltage testing.

[0017] (3) The present invention, through the arrangement of connector, insulating connecting gear, roller and isosceles trapezoidal block, enables the connector to contact the resistor tube when energized and to separate from the resistor tube when moving, thereby avoiding friction of the connector on the resistor tube, improving the durability of the component and avoiding excessive wear of the connector. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 3 This is a schematic diagram showing the positional relationship between the resistor tube and the connecting transmission assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the test module of the present invention; Figure 5 This is an exploded structural diagram of the lifting assembly of the present invention; Figure 6 This is a partial cross-sectional view of the connecting component of the present invention; Figure 7 This is a schematic diagram of the equidistant adjustment component of the present invention; Figure 8 This is a schematic diagram of the safety component structure of the present invention.

[0019] Explanation of the labels in the diagram: 100. Main module; 110. Device body; 120. Test port; 130. Adjustment door; 140. Resistance tube; 150. Protective shell; 200. Test module; 210. Lifting assembly; 211. First lifting screw; 212. Slide rail; 213. Insulated slider; 214. First motor; 215. Bevel gear; 220. Connecting assembly; 221. U-shaped connecting block; 222. Steering shaft; 223. Connector; 224. Torsion spring; 225. Insulated connecting gear; 226. Longitudinal rod; 227. Connecting gear; 230. Connecting transmission assembly; 231. Mounting sleeve; 232. Rack; 233. First spring; 234. Movable frame; 235. Sliding block; 236. Roller; 237. Second spring ; 238. Movable lever; 239. Mounting base; 2310. Ball bearing; 2311. Steering push lever; 240. T-block; 250. Equidistant adjustment assembly; 251. Longitudinal slot; 252. Sliding seat; 253. Scissor lift; 254. Bidirectional screw; 255. Second motor; 256. Transmission block; 257. Pointer; 260. Isosceles trapezoidal block; 270. Safety component; 271. Mounting frame; 272. Lifting seat; 273. Third motor; 274. Second lifting screw; 275. Connecting rod; 276. Right-angled trapezoidal block; 280. Touch button; 290. Numerical slot. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The following is in conjunction with the appendix Figures 1-8 The present invention will be described in further detail below.

[0024] Please see Figures 1-8 A testing device for a power transformer includes a main module 100 and a testing module 200. The main module 100 includes a device body 110, with a test port 120 fixedly connected to the top of the inner wall of the device body 110. An adjustment cavity is formed inside the device body 110, and a resistance tube 140 is disposed between the top and bottom of the inner wall of the adjustment cavity. The testing module 200 includes a lifting assembly 210 disposed between the top and bottom of the inner wall of the adjustment cavity. A connecting assembly 220 and a connecting transmission assembly 230 are connected to the lifting assembly 210. The connecting transmission assembly 230 is connected to the connecting assembly 220. The component 220 is electrically connected to the test port 120. The connecting component 220 is located outside the resistor tube 140. A T-shaped block 240 is connected to the front end of the inner wall of the adjustment cavity. An equidistant adjustment component 250 is provided on the T-shaped block 240. Multiple isosceles trapezoidal blocks 260 are provided on the equidistant adjustment component 250. A safety component 270 is provided on one side of the inner wall of the adjustment cavity. The safety component 270 and the multiple isosceles trapezoidal blocks 260 are adapted to the connecting transmission component 230. A touch button 280 electrically connected to the lifting component 210 is provided on the lifting component 210. A numerical slot 290 is opened on the T-shaped block 240.

[0025] During testing, the transformer to be tested is first connected to test port 120. Then, the resistor tube 140 is energized, and the safety component 270 is adjusted to a suitable height. Next, the lifting component 210 is activated, causing the connecting component 220 and the connecting transmission component 230 to gradually rise. When the connecting transmission component 230 rises to the height of one of the isosceles trapezoidal blocks 260, the isosceles trapezoidal block 260 pushes the connecting transmission component 230, causing the connecting component 220 to contact the lowest position of the resistor tube 140. This allows the connecting component 220 to supply power to test port 120, thus testing the transformer. At this time, the connecting transmission component 230 presses the touch button 280, which controls the lifting component 210 to stop rising for a period of time to facilitate the test. Subsequently, the lifting component 210 continues to drive the connecting transmission component 230, causing the connecting transmission component 230 to separate from one of the isosceles trapezoidal blocks 260. This causes the connecting component 220 to open and separate from the resistor tube 140, thereby stopping the power supply to the test port 120. When the connecting transmission component 230 subsequently contacts another isosceles trapezoidal block 260, the next gradient voltage test will be performed. The connecting transmission component 230 will then contact the isosceles trapezoidal blocks 260 in sequence to achieve the specified gradient voltage test. When the connecting transmission component 230 contacts the safety component 270, the safety component 270 will push the connecting transmission component 230 to move, so that the connecting transmission component 230 will not contact the isosceles trapezoidal block 260 in the future, and the connecting component 220 will not contact the resistor tube 140 in the future, thereby stopping the test and allowing the transformer to be tested within the specified voltage range to ensure the safety of the test. By opening the equidistant adjustment component 250, the spacing between multiple isosceles trapezoidal blocks 260 can be adjusted, so that the position of the connecting transmission component 230 contacting the isosceles trapezoidal block 260 changes, thereby changing the voltage gradient of the test and adapting to more test requirements.

[0026] The equidistant adjustment assembly 250 includes a longitudinal groove 251 formed on the rear end face of the T-block 240. Multiple sliding seats 252 are slidably connected inside the longitudinal groove 251. Multiple isosceles trapezoidal blocks 260 are respectively fixedly connected to the rear end faces of the multiple sliding seats 252. A scissor lift 253 is movably connected between the outer surfaces of the multiple sliding seats 252. Two transmission blocks 256 are movably connected to one end of the scissor lift 253. The equidistant adjustment assembly 250 also includes a transverse groove formed on the T-block 240. Both transmission blocks 256 are slidably connected inside the transverse groove. A bidirectional screw 254 is rotatably connected between the two sides of the inner wall of the transverse groove. Both transmission blocks 256 are threadedly connected to the outer surface of the bidirectional screw 254. A pointer 257 is fixedly connected to the front end face of both transmission blocks 256. Both pointers 257 are located behind the numerical groove 290. A second motor 255 is mounted on the T-block 240. The output shaft of the second motor 255 is fixedly connected to one end of the bidirectional screw 254.

[0027] Turning on the second motor 255 drives the bidirectional screw 254 to rotate. During the rotation of the bidirectional screw 254, it will drive the two transmission blocks 256 to move closer or further apart, causing the scissor lift 253 to drive multiple sliding seats 252 to slide, thereby adjusting the spacing between multiple isosceles trapezoidal blocks 260. The pointer 257 pointing to the numerical slot 290 can display the voltage gradient, thus changing the voltage gradient of the test to adapt to more transformer test requirements.

[0028] The connecting assembly 220 includes a U-shaped connecting block 221, which is electrically connected to the test port 120. Two steering shafts 222 are rotatably connected between the top and bottom of the inner wall of the U-shaped connecting block 221. Connecting members 223 are rotatably connected to the outer surfaces of both steering shafts 222. Torsion springs 224 are fixedly connected between the top of each connecting member 223 and the outer surfaces of both steering shafts 222. The connecting assembly 220 also includes a longitudinal rod 226 disposed inside the lifting assembly 210. A connecting gear 227 is fixedly connected to the outer surface of the longitudinal rod 226. The two steering shafts... Insulated connecting gears 225 are fixedly connected to the outer surface of shaft 222. The outer surfaces of two insulated connecting gears 225 mesh with each other. The outer surface of connecting gear 227 meshes with the outer surface of one of the insulated connecting gears 225. The lifting assembly 210 includes a first lifting screw 211 rotatably connected between the top and bottom of the inner wall of the adjustment cavity. A slide rail 212 is fixedly connected to one side of the inner wall of the adjustment cavity. An insulated slider 213 is threadedly connected to the outer surface of the first lifting screw 211. The insulated slider 213 is slidably connected to the outer surface of the slide rail 212. The longitudinal rod 226 is rotatably connected to... Inside the insulating slider 213, a first motor 214 is fixedly connected to one side of the main body 110 of the device. The output shaft of the first motor 214 extends into the interior of the adjustment cavity. Both the output shaft of the first motor 214 and the outer surface of the first lifting screw 211 are fixedly connected to bevel gears 215, which mesh with each other. A U-shaped connecting block 221 is fixedly connected to one side of the insulating slider 213. The connecting transmission assembly 230 includes a mounting sleeve 231 fixedly connected inside the insulating slider 213. A connecting gear 227 is movably connected inside the mounting sleeve 231. The rack 232 is engaged. One end of the rack 232 is fixedly connected to the inside of the mounting sleeve 231 with a first spring 233. The other end of the rack 232 is fixedly connected to a movable frame 234. A sliding block 235 is slidably connected inside the movable frame 234. A roller 236 is installed on the outer surface of the sliding block 235. A second spring 237 is fixedly connected between the outer surface of the sliding block 235 and one side of the inner wall of the movable frame 234. A steering press rod 2311 is fixedly connected to the outer surface of the rack 232. One end of the steering press rod 2311 is located directly in front of the touch button 280.

[0029] When the third motor 273 is turned on, it will drive the second lifting screw 274, which in turn will drive the right-angled trapezoidal block 276 to a specified height. Then, the first motor 214 is turned on, driving one of the bevel gears 215. The meshing of the two bevel gears 215 will drive the first lifting screw 211, which will then drive the insulating slider 213 to slide upwards on the outer surface of the slide rail 212. Subsequently, the roller 236 contacts one of the isosceles trapezoidal blocks 260, which will push the roller 236. The roller 236 will then push the rack 232 to move inwards into the mounting sleeve 231. At this time, the first spring 233 is compressed, and the rack 232 will also drive the connecting gear 227, which in turn drives one of the insulating connecting gears 225. This causes the two insulating connecting gears 225 to drive the two steering shafts 222 to rotate in opposite directions. 222 drives the two connectors 223 to swing and contact the resistor tube 140 to the lowest position of the resistor tube 140. The connectors 223, the steering shaft 222, and the U-shaped connecting block 221 conduct electricity, so that the U-shaped connecting block 221 supplies power to the test port 120, thereby testing the transformer. At this time, the steering press rod 2311 will press the touch button 280, which will control the first motor 214 to stop driving for a period of time to cooperate with the test screening. After the voltage test of this level is completed, the first motor 214 continues to drive the roller 236 to rise. The first spring 233 pushes the roller 236 to reset, thereby causing the connectors 223 to open again, thereby stopping the power supply to the test port 120. When the roller 236 rises and contacts another isosceles trapezoidal block 260, the next level of voltage test will be performed. The roller 236 contacts the isosceles trapezoidal block 260 in sequence to achieve the specified gradient voltage test.

[0030] The connecting transmission assembly 230 also includes a movable rod 238 fixedly connected to the other side of the sliding block 235. One end of the movable rod 238 extends to the outside of the movable frame 234 and is fixedly connected to a mounting base 239. A ball bearing 2310 is movably connected to the mounting base 239. The safety assembly 270 includes a mounting frame 271 fixedly connected to one side of the inner wall of the adjustment cavity. A second lifting screw 274 is rotatably connected between the top and bottom of the inner wall of the mounting frame 271. A lifting seat 272 is slidably connected inside the mounting frame 271. The interior of the seat 272 is threadedly connected to the outer surface of the second lifting screw 274. The top of the mounting frame 271 is fixedly connected to the third motor 273. The output shaft of the third motor 273 is fixedly connected to the top of the second lifting screw 274. The outer surface of the lifting seat 272 is fixedly connected to two connecting rods 275. A right-angled trapezoidal block 276 is fixedly connected between one end of the two connecting rods 275. The right-angled trapezoidal block 276 is located on one side of the mounting frame 271. One side of the mounting frame 271 is in contact with the outer surface of the ball bearing 2310.

[0031] Then, the third motor 273 is turned on, which will drive the second lifting screw 274. The second lifting screw 274 will drive the right trapezoidal block 276 to a specified height. During the rise of the roller 236, the ball 2310 will roll on the mounting frame 271. When the ball 2310 contacts the ramp of the right trapezoidal block 276, it will be pushed. The ball 2310 pushes the sliding block 235 through the movable rod 238, which compresses the second spring 237. The roller 236 is deviated from the path of contacting the isosceles trapezoidal block 260. Subsequently, the rising roller 236 will not contact the isosceles trapezoidal block 260, so that the connector 223 will not contact the resistor tube 140, thereby stopping the test and allowing the transformer to be tested within the specified voltage range.

[0032] The main module 100 includes a protective shell 150 fixedly connected to the top of the device body 110. The top of the T-shaped block 240 is located inside the protective shell 150. An adjustment door 130 is provided on the front end face of the device body 110. The adjustment door 130 is located directly in front of the numerical slot 290.

[0033] By adjusting the settings of the door 130, it is easier for staff to observe the numerical slot 290, thereby facilitating the adjustment of the spacing between multiple isosceles trapezoidal blocks 260.

[0034] The implementation principle of this invention is as follows: During testing, the transformer to be tested is first connected to the test port 120. Then, the resistor tube 140 is energized, and the third motor 273 is turned on. The third motor 273 will drive the second lifting screw 274, which will drive the lifting seat 272 to move the right trapezoidal block 276 to a specified height. Then, the first motor 214 is turned on, which will drive one of the bevel gears 215. Through the meshing of the two bevel gears 215, the first lifting screw 211 will be driven. The first lifting screw 211 will drive the insulating slider 213 to slide and rise on the outer surface of the slide rail 212. Then, the roller 236 and one of the isosceles trapezoidal blocks 260... Upon contact, the isosceles trapezoidal block 260 will push the roller 236, which in turn will push the rack 232 into the mounting sleeve 231. At this time, the first spring 233 is compressed, and the rack 232 will also drive the connecting gear 227. The connecting gear 227 drives one of the insulated connecting gears 225, causing the two insulated connecting gears 225 to drive the two steering shafts 222 to rotate in opposite directions. The two steering shafts 222 drive the two connecting parts 223 to swing to contact the resistor tube 140 at its lowest position. The connecting parts 223, the steering shafts 222, and the U-shaped connecting block 221 become conductive, allowing the U-shaped connecting block 221 to supply power to the test port 120, thereby testing the transformer. At this time, the steering press rod 2... 311 will press the touch button 280, which will control the first motor 214 to stop driving for a period of time to cooperate with the test screening. After the voltage test at this level is completed, the first motor 214 will continue to drive the roller 236 to rise. The first spring 233 will push the roller 236 to reset, thereby causing the connector 223 to reopen and stopping the power supply to the test port 120. When the roller 236 rises and contacts another isosceles trapezoidal block 260, the next level of voltage test will be performed. The roller 236 will contact the isosceles trapezoidal block 260 in sequence to achieve the specified gradient voltage test. During the rise of the roller 236, the ball 2310 will roll on the mounting frame 271. When the ball bearing 2310 contacts the ramp of the right-angled trapezoidal block 276, it will be pushed. The ball bearing 2310 pushes the sliding block 235 through the movable rod 238, compressing the second spring 237. The roller 236 then deviates from its path of contacting the isosceles trapezoidal block 260. Subsequently, the rising roller 236 will not contact the isosceles trapezoidal block 260, preventing the connector 223 from contacting the resistor tube 140, thus stopping the test. The height of the right-angled trapezoidal block 276 can be adjusted by the third motor 273, causing the roller 236 to deviate after reaching the specified voltage height, ensuring the transformer is tested within the specified voltage range and guaranteeing test safety. By opening the adjustment door 130, the second motor 255 can be activated to drive the bidirectional screw 254 to rotate.During the rotation of the bidirectional screw 254, it drives the two transmission blocks 256 to move closer or further apart, causing the scissor lift 253 to drive multiple sliding seats 252 to slide, thereby adjusting the spacing between multiple isosceles trapezoidal blocks 260. The pointer 257 pointing to the numerical slot 290 displays the voltage gradient. Therefore, by changing the voltage gradient of the test, it can adapt to more transformer testing requirements, making the entire testing process more standardized, regulated, and automated. After a single transformer is tested, the third motor 273 drives the second lifting screw 274 to reset the lifting seat 272, causing the right-angled trapezoidal block 276 to reset. Then, the first motor 214 drives the roller 236 to reset, ensuring that the roller 236 does not contact the isosceles trapezoidal block 260 during the reset process. When testing the next transformer, the above procedure is repeated.

[0035] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A test device for power transformers, comprising a main module (100) and a test module (200), characterized in that: The main module (100) includes a device main body (110), a test port (120) is fixedly connected to the top of the inner wall of the device main body (110), an adjusting cavity is arranged in the device main body (110), and a resistance tube (140) is arranged between the top and the bottom of the inner wall of the adjusting cavity; The test module (200) includes a lifting assembly (210) arranged between the top and the bottom of the inner wall of the adjusting cavity, a connecting assembly (220) and a linkage transmission assembly (230) are connected to the lifting assembly (210), the linkage transmission assembly (230) is connected with the connecting assembly (220), the connecting assembly (220) is electrically connected with the test port (120), the connecting assembly (220) is located outside the resistance tube (140), a T-shaped block (240) is connected to the front end surface of the inner wall of the adjusting cavity, an equidistant adjusting assembly (250) is arranged on the T-shaped block (240), a plurality of isosceles trapezoidal blocks (260) are arranged on the equidistant adjusting assembly (250), a safety assembly (270) is arranged on one side of the inner wall of the adjusting cavity, the safety assembly (270) and the plurality of isosceles trapezoidal blocks (260) are matched with the linkage transmission assembly (230), a touch button (280) electrically connected with the lifting assembly (210) is arranged on the lifting assembly (210), and a numerical groove (290) is arranged on the T-shaped block (240).

2. A test device for a power transformer according to claim 1, characterized in that The equidistant adjusting assembly (250) includes a longitudinal groove (251) arranged on the rear end surface of the T-shaped block (240), a plurality of sliding seats (252) are slidably connected in the longitudinal groove (251), the plurality of isosceles trapezoidal blocks (260) are fixedly connected to the rear end surfaces of the plurality of sliding seats (252), respectively, a scissor frame (253) is movably connected between the outer surfaces of the plurality of sliding seats (252), and one end of the scissor frame (253) is movably connected with two transmission blocks (256).

3. A test device for a power transformer according to claim 2, characterized in that: The equidistant adjusting assembly (250) further includes a transverse groove arranged on the T-shaped block (240), the two transmission blocks (256) are slidably connected in the transverse groove, a bidirectional screw rod (254) is rotatably connected between the two sides of the inner wall of the transverse groove, the two transmission blocks (256) are threadedly connected with the outer surfaces of the bidirectional screw rod (254), the front end surfaces of the two transmission blocks (256) are fixedly connected with pointers (257), respectively, the two pointers (257) are located behind the numerical groove (290), a second motor (255) is installed on the T-shaped block (240), and the output shaft of the second motor (255) is fixedly connected with one end of the bidirectional screw rod (254).

4. A test device for a power transformer according to claim 3, characterized in that: The connecting assembly (220) comprises a U-shaped connecting block (221) electrically connected with the test port (120), two turning shafts (222) rotatably connected between the top and bottom of the inner wall of the U-shaped connecting block (221), a connecting piece (223) rotatably connected to the outer surface of each of the two turning shafts (222), and a torsion spring (224) fixedly connected between the top of each of the two connecting pieces (223) and the outer surface of each of the two turning shafts (222).

5. A test device for a power transformer according to claim 4, characterized in that: The connecting assembly (220) further comprises a longitudinal rod (226) arranged inside the lifting assembly (210), a connecting gear (227) fixedly connected to the outer surface of the longitudinal rod (226), and two insulating link gears (225) fixedly connected to the outer surface of each of the two turning shafts (222), wherein the outer surfaces of the two insulating link gears (225) are in mesh with each other, and the outer surface of the connecting gear (227) is in mesh with the outer surface of one of the insulating link gears (225).

6. A test device for a power transformer according to claim 5, characterized in that: The lifting assembly (210) comprises a first lifting screw (211) rotatably connected between the top and bottom of the inner wall of the adjusting cavity, a slide rail (212) fixedly connected to one side of the inner wall of the adjusting cavity, an insulating sliding block (213) threadedly connected to the outer surface of the first lifting screw (211), the insulating sliding block (213) being slidably connected to the outer surface of the slide rail (212), the longitudinal rod (226) being rotatably connected to the inside of the insulating sliding block (213), a first motor (214) fixedly connected to one side of the device main body (110), the output shaft of the first motor (214) extending into the inside of the adjusting cavity, a conical gear (215) fixedly connected to the outer surface of the output shaft of the first motor (214) and the outer surface of the first lifting screw (211), wherein the outer surfaces of the two conical gears (215) are in mesh with each other, and the U-shaped connecting block (221) is fixedly connected to one side of the insulating sliding block (213).

7. A test device for a power transformer according to claim 6, characterized in that The link transmission assembly (230) comprises a mounting sleeve (231) fixedly connected to the inside of the insulating sliding block (213), a rack rod (232) movably connected to the inside of the mounting sleeve (231) and in mesh with the connecting gear (227), a first spring (233) fixedly connected between one end of the rack rod (232) and the inside of the mounting sleeve (231), an activity frame (234) fixedly connected to the other end of the rack rod (232), an sliding block (235) slidably connected to the inside of the activity frame (234), a roller (236) mounted to the outer surface of the sliding block (235), a second spring (237) fixedly connected between the outer surface of the sliding block (235) and one side of the inner wall of the activity frame (234), and a turning pressing rod (2311) fixedly connected to the outer surface of the rack rod (232), wherein one end of the turning pressing rod (2311) is located directly in front of the touch button (280).

8. A test device for a power transformer according to claim 7, characterized in that: The connecting transmission assembly (230) further comprises a movable rod (238) fixedly connected to the other side of the sliding block (235), one end of the movable rod (238) extends to the outside of the movable frame (234) and is fixedly connected with a mounting seat (239), and the mounting seat (239) is movably connected with a ball (2310).

9. A test device for a power transformer according to claim 8, characterized in that: The safety assembly (270) comprises a mounting strip frame (271) fixedly connected to one side of the inner wall of the adjusting cavity, a second lifting screw (274) rotatably connected between the top and the bottom of the inner wall of the mounting strip frame (271), a lifting seat (272) slidably connected in the mounting strip frame (271), the inner part of the lifting seat (272) is in threaded connection with the outer surface of the second lifting screw (274), a third motor (273) fixedly connected to the top of the mounting strip frame (271), the output shaft of the third motor (273) is fixedly connected with the top end of the second lifting screw (274), two connecting rods (275) fixedly connected between one end of the two connecting rods (275) and fixedly connected with a right trapezoidal block (276) on one side of the mounting strip frame (271), the right trapezoidal block (276) is located on one side of the mounting strip frame (271), and the outer surface of the mounting strip frame (271) is in contact with the outer surface of the ball (2310).

10. A test device for a power transformer according to claim 9, characterized in that: The main body module (100) comprises a protective shell (150) fixedly connected to the top of the device main body (110), the top of the T-shaped block (240) is located in the interior of the protective shell (150), the front end face of the device main body (110) is provided with an adjusting door (130), and the adjusting door (130) is located in front of the numerical groove (290).

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