Voltage transformer insulation detection device and method

Abstract

The invention discloses a voltage transformer insulation detection device and method, and belongs to the technical field of insulation detection.The device comprises a detection table, an insulation tester is fixedly installed at the top of one end of the detection table, an insulation resistance meter is fixedly installed at the top of the other end of the detection table, and a driving assembly is arranged at the bottom of the middle of the detection table; and the driving assembly comprises a driving base, a motor is mounted in the driving base, and a clamping assembly is mounted at the top of the driving base. Under the action of the driving assembly, the mutual inductor is driven to rotate and the detection table is driven to move, the front face of the mutual inductor corresponds to the detection equipment and is close to the detection equipment, and therefore the mutual inductor can be conveniently connected with different types of detection instruments, and under the cooperation of the wire bunching assembly and the driving assembly, a connecting wire can be stored; disorder caused by too many test lines on the detection table is avoided, detection equipment can be conveniently switched, the detection efficiency is improved, and the clamping assembly keeps the stability of the mutual inductor body in the testing and rotating process.

Description

Technical Field

[0001] The present invention relates to the technical field of insulation detection, and more specifically, to a voltage transformer insulation detection device and method. Background Art

[0002] Testing the insulation resistance of a voltage transformer is one of the important means to ensure the normal operation of the power system. To ensure the reliability and safety of the power system, it is necessary to regularly detect the insulation performance of the voltage transformer. Most of the existing detection methods detect the insulation performance of the transformer by connecting instruments such as a tester and a resistance meter to the transformer.

[0003] For the existing detection methods, first, separate instruments need to be connected to the transformer one by one, and detections are carried out for different objects. Both installation and disassembly take time. In addition, it is necessary to switch the connection between the transformer and different test instruments. During the detection, the connecting wires are messy and inconvenient to sort out, resulting in low detection efficiency for the insulation performance of the transformer. When the detection equipment is connected to the transformer alone for detection, since the relative position between the transformer body and the detection equipment is difficult to control, interference may occur between the devices during the test, affecting the accuracy of the test results. When the traditional detection device is used for testing the voltage transformer, due to the lack of an effective fixing and supporting structure, the transformer may vibrate or displace during the test, affecting the stability and accuracy of the test results. Summary of the Invention

[0004] To solve the deficiencies of the existing technology, the present invention provides a voltage transformer insulation detection device and method. The structure of the present invention is novel. Under the action of the driving component, it can drive the rotation of the transformer and the movement of the detection table, align the front surface of the transformer with the detection equipment and approach the detection equipment, so as to facilitate the connection of the transformer to different types of detection instruments. The wire bundling component can cooperate with the driving component to store the connecting wires, avoid excessive test wires on the detection table causing chaos, facilitate switching of the detection equipment, and improve the detection efficiency.

[0005] The present invention adopts the following technical solutions.

[0006] The first aspect of the present invention discloses a voltage transformer insulation detection device, including a detection table. An insulation tester is fixedly installed at the top of one end of the detection table, and an insulation resistance meter is fixedly installed at the top of the other end of the detection table for the insulation detection of the voltage transformer.

[0007] A driving component is provided at the bottom of the middle of the detection table. The driving component includes a driving base. A motor is installed inside the driving base, and a clamping component is installed at the top of the driving base to maintain the stability of the voltage transformer during testing and rotation.

[0008] The clamping assembly includes a bearing platform, and the bottom of the bearing platform is fixedly connected to the motor output end of the driving base. Clamping frames are provided on both sides of the bearing platform, and a voltage transformer body is placed on the clamping frames and the top of the bearing platform. Connecting wires are provided on the surfaces of the insulation tester and the insulation resistance meter facing the voltage transformer body. The insulation tester and the insulation resistance meter are electrically connected to the voltage transformer body through the connecting wires, and a wire bundling assembly is provided at the position of the detection table corresponding to the two connecting wires on both sides for facilitating the connection test between the voltage transformer and the detection instrument.

[0009] The wire bundling assembly includes a connecting plate, and two limiting rings are symmetrically and fixedly provided on the surface of the connecting plate. The connecting wires of the insulation tester and the insulation resistance meter both slide through the limiting rings. A plug-in frame is slidably inserted on one side of the detection table, and a partial discharge tester is fixedly provided on the top of the plug-in frame.

[0010] Preferably, the driving assembly further includes a first gear. The top of the driving base is rotatably installed with a first gear through a bearing, and the first gear is fixedly connected to the motor output end inside the driving base. A moving groove is formed on the surface of the detection table, and a toothed plate is fixedly provided on the inner wall of one side of the moving groove. The first gear is meshed with the toothed plate.

[0011] Preferably, the wire bundling assembly further includes a winding base. The winding bases are fixedly provided on both sides of the driving base, and a second gear is fixedly provided on the winding shaft top of the winding base. The second gear is meshed with the first gear.

[0012] Preferably, a traction rope is wound on the winding shaft of the winding base, and the other end of the traction rope is fixedly connected to the connecting plate.

[0013] Preferably, sliding sleeves are fixedly provided at both ends of the connecting plate. Slide bars are fixedly provided at the positions corresponding to both ends of the connecting plate on the top of the detection table, and the sliding sleeves are slidably sleeved on the slide bars. A return spring is sleeved on the surface of the slide bar at the bottom of the sliding sleeve, and both ends of the return spring are fixedly connected to the bottom of the slide bar and the sliding sleeve.

[0014] Preferably, the clamping assembly further includes sliding frames. Sliding frames are fixedly provided at the bottom of the clamping frames on both sides of the bearing platform, and a bidirectional screw rod is rotatably installed inside the sliding frames through a bearing. A connecting block is fixedly provided at the bottom of the clamping frame, and the connecting block is threadedly sleeved on the surface of the bidirectional screw rod.

[0015] Preferably, electric push rods are fixedly provided at the top of both ends of the plug-in frame, and the extending ends of the electric push rods are fixedly connected to the side of the detection table. The plug-in frame is slidably inserted on the side of the detection table, and a sensor end is installed at the front end of the partial discharge tester.

[0016] Preferably, storage frames are fixed to the tops of both the insulation tester and the insulation resistance meter on the connection wires. The lower ends of the storage frames are provided with openings, and the connection wire joint ends at the farther ends of the transformer body are stored inside the storage frames.

[0017] Preferably, two groups of support columns are fixed to both ends of the bottom of the test bench, and moving wheels are rotatably installed at the bottoms of the support columns.

[0018] The second aspect of the present invention discloses a method for insulating detection of a voltage transformer, based on the described voltage transformer insulating detection device. The detection method includes the following steps:

[0019] Preparation work: Disconnect the connection between the voltage transformer and the system, and discharge the transformer. After discharging, the voltage transformer is clamped on the clamping assembly of the test bench, and the driving assembly drives the voltage transformer to rotate. The insulation tester, partial discharge tester, and insulation resistance meter are respectively connected through the connection wires.

[0020] Insulation resistance test: Use the insulation resistance meter to test the insulation resistance of the voltage transformer. Connect the positive and negative poles of the insulation resistance meter between the winding and the outer shell of the voltage transformer respectively, and read the insulation resistance value.

[0021] Dielectric loss tangent value test: Use the insulation tester to test the dielectric loss tangent value of the voltage transformer. Connect the electrodes of the tester between the winding and the outer shell of the voltage transformer respectively, set an appropriate test voltage, and read the dielectric loss tangent value.

[0022] Partial discharge test: Detect the partial discharge situation inside the voltage transformer through the partial discharge tester. Attach the sensor of the tester to the outer shell of the voltage transformer and observe the partial discharge signal.

[0023] Test result analysis: According to the test data, compare with the standard value of the voltage transformer to judge whether its insulation performance is qualified.

[0024] Compared with the prior art, the beneficial effects of the present invention at least include:

[0025] 1. In the present invention, the bottom of the transformer body is placed on the bearing platform. Rotate the bidirectional screw, and the connection block cooperates with the bidirectional screw to drive the clamping frame to move along the inside of the sliding frame, clamping and fixing both sides of the bottom of the transformer body, and maintaining the stability of the transformer body during the test and rotation process.

[0026] 2. When the first gear rotates in the present invention, the second gear rotates synchronously with the first gear in meshing, driving one of the winding seats on both sides of the base to wind and the other to unwind, always maintaining opposite actions. The connection line at the farthest end from the current transformer body is limited by the connecting plate and the limiting ring and is stored inside the storage frame. During this process, under the elastic force of the return spring, the connection line of the unused test instrument is protected. And the connection line of the test instrument close to the current transformer body is wound by the traction rope of the winding seat. The traction rope pulls the connecting plate to slide downward along the sliding rod through the sliding sleeves at both ends, releasing the reserved length of the connection line. Coupled with the mutual approach of the detection instrument and the current transformer body, it is convenient to connect and test the two.

[0027] 3. When the motor in the driving base drives the first gear to rotate in the present invention, the first gear meshes with the toothed plate. Then, under the action of the bottom support columns and the moving wheels, the detection table moves horizontally. The insulation testers and insulation resistance meters at both ends of the detection table approach the current transformer body alternately and complete the connection test. There will be no interference between the two tests. The moving grooves on the surface of the detection table can allow the current transformer body and the driving component to pass through along the moving grooves when the detection table moves, without moving interference.

[0028] 4. Compared with the prior art, in the present invention, through the action of the driving component, the rotation of the current transformer and the movement of the detection table can be driven, aligning the front of the current transformer with the detection equipment and approaching the detection equipment, so as to facilitate the connection of the current transformer with different types of detection instruments. The wire bundling component can cooperate with the driving component to store the connection lines, avoiding chaos caused by excessive test lines on the detection table, facilitating the switching of detection equipment, and improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an insulation detection device for a voltage transformer according to the present invention;

[0030] Figure 2 It is a schematic diagram of the top structure of the mixing box of an insulation detection device for a voltage transformer according to the present invention;

[0031] Figure 3 It is a schematic diagram of the internal structure of the mixing box of an insulation detection device for a voltage transformer according to the present invention;

[0032] Figure 4 It is a schematic diagram of the top structure of the chassis of an insulation detection device for a voltage transformer according to the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the driving component of an insulation detection device for a voltage transformer according to the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of the enclosing component of an insulation detection device for a voltage transformer according to the present invention;

[0035] Figure 7 Schematic diagram of the connection between the enclosure assembly and the hollow rod of an insulation detection device for a voltage transformer according to the present invention.

[0036] In the figure: 1, detection table; 11, insulation tester; 12, insulation resistance meter; 13, moving groove; 14, support column; 15, moving wheel; 2, transformer body; 3, wire bundling assembly; 31, winding base; 32, traction rope; 33, sliding rod; 34, return spring; 35, connecting plate; 36, limiting ring; 37, sliding sleeve; 4, driving assembly; 41, driving base; 42, first gear; 43, toothed plate; 44, second gear; 5, clamping assembly; 51, bearing platform; 52, sliding frame; 53, clamping frame; 54, connecting block; 55, bidirectional screw; 6, storage frame; 7, insertion frame; 71, electric push rod; 72, partial discharge tester; 73, sensor end. Specific embodiments

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] Embodiment 1 of the present invention provides an insulation detection device for a voltage transformer, as Figures 1-7 shown, including a detection table 1. An insulation tester 11 is fixedly installed at the top of one end of the detection table 1, and an insulation resistance meter 12 is fixedly installed at the top of the other end of the detection table 1. A driving assembly 4 is provided at the middle bottom of the detection table 1. The driving assembly 4 includes a driving base 41. A motor is installed inside the driving base 41, and a clamping assembly 5 is installed at the top of the driving base 41. The clamping assembly 5 includes a bearing platform 51, and the bottom of the bearing platform 51 is fixedly connected to the output end of the motor of the driving base 41. Clamping frames 53 are provided on both sides of the bearing platform 51, and a transformer body 2 is placed on the top of the clamping frames 53 and the bearing platform 51. There are two connecting wires on the surfaces of the insulation tester 11 and the insulation resistance meter 12 facing the transformer body 2. The insulation tester 11 and the insulation resistance meter 12 are electrically connected to the transformer body 2 through the connecting wires, and wire bundling assemblies 3 are provided at the positions of the detection table 1 corresponding to the connecting wires on both sides. The wire bundling assembly 3 includes a connecting plate 35. Two limiting rings 36 are symmetrically fixed on the surface of the connecting plate 35, and the connecting wires of the insulation tester 11 and the insulation resistance meter 12 both slide through the limiting rings 36. An insertion frame 7 is slidably inserted on one side of the detection table 1, and a partial discharge tester 72 is fixed at the top of the insertion frame 7.

[0039] When using the device, install the mutual inductor body 2 inside the clamping assembly 5, drive the mutual inductor body 2 to rotate through the driving assembly 4, and face the front of the mutual inductor body 2 towards the nearby detection instrument. The wire harness assembly 3 releases the connecting wire at this position, facilitating manual connection of the detection instrument and the mutual inductor body 2 through the connecting wire. After testing the mutual inductor body 2 respectively through the insulation tester 11 and the insulation resistance meter 12, then conduct a contact test with the mutual inductor body 2 through the partial discharge tester 72 to achieve efficient insulation detection of the mutual inductor body 2.

[0040] As Figure 2 , Figure 4 shown, in this embodiment, the driving assembly 4 further includes a first gear 42. The top of the driving base 41 is rotatably installed with a first gear 42 through a bearing, and the first gear 42 is fixedly connected to the output end of the motor inside the driving base 41. A moving groove 13 is formed on the surface of the detection table 1, and a toothed plate 43 is fixed to one inner wall of the moving groove 13. The first gear 42 is meshed with the toothed plate 43. Two groups of support columns 14 are fixed to both ends of the bottom of the detection table 1, and moving wheels 15 are rotatably installed at the bottoms of the support columns 14. When the motor in the driving base 41 drives the first gear 42 to rotate, the driving base 41 is fixed on the ground. The first gear 42 is meshed with the toothed plate 43, and then the detection table 1 moves horizontally under the action of the bottom support columns 14 and the moving wheels 15. The insulation testers 11 and the insulation resistance meters 12 at both ends of the detection table 1 approach the mutual inductor body 2 alternately through the meshing of the first gear 42 and the toothed plate 43 in different directions and complete the connection test. There will be no interference between the two tests. When the detection table 1 moves, the moving groove 13 on the surface of the detection table 1 allows the mutual inductor body 2 and the driving assembly 4 to pass through along the moving groove 13 without moving interference.

[0041] As Figure 3 , Figures 5-6As shown, in this embodiment, the wire harness assembly 3 further includes a winding base 31. Winding bases 31 are fixed on both sides of the driving base 41, and a second gear 44 is fixed on the top of the winding shaft of the winding base 31. The second gear 44 is meshed and connected with the first gear 42. A traction rope 32 is wound on the winding shaft of the winding base 31. The other end of the traction rope 32 is fixedly connected with a connecting plate 35. Sliding sleeves 37 are fixed at both ends of the connecting plate 35. Sliding rods 33 are fixed at positions corresponding to both ends of the connecting plate 35 on the top of the detection table 1, and the sliding sleeves 37 are slidably sleeved on the sliding rods 33. A return spring 34 is sleeved on the surface of the sliding rod 33 at the bottom of the sliding sleeve 37, and both ends of the return spring 34 are fixedly connected with the bottom of the sliding rod 33 and the sliding sleeve 37. Storage frames 6 are fixedly installed at the tops of the insulation tester 11 and the insulation resistance meter 12 on the connecting wire. An opening is provided at the lower end of the storage frame 6. The connecting wire joint end at the farther end of the current transformer body 2 is stored inside the storage frame 6, and the connecting wire is wound on the connecting plate 35. When the first gear 42 rotates, the second gear 44 rotates synchronously with the first gear 42 in meshing. One of the winding bases 31 on both sides of the driving base 41 winds and the other unwinds, always maintaining opposite actions. The connecting wire at the farthest end from the current transformer body 2 is stored inside the storage frame 6 under the limitation of the connecting plate 35 and the limit ring 36. During this process, under the elastic force of the return spring 34, the connecting wires of the unused test instruments are protected. And the connecting wires of the test instruments close to the current transformer body 2 are pulled by the traction rope 32 wound by the winding base 31. The traction rope 32 pulls the connecting plate 35 to slide downward along the sliding rod 33 through the sliding sleeves 37 at both ends, releasing the reserved length of the connecting wire. Coupled with the mutual approach of the detection instrument and the current transformer body 2, it is convenient to connect and test the two.

[0042] As Figure 3 shown, in this embodiment, the clamping assembly 5 further includes a sliding frame 52. Sliding frames 52 are fixed at the bottoms of both sides of the bearing table 51 and inside the clamping frames 53. A bidirectional screw 55 is rotatably installed inside the sliding frame 52 through a bearing. A connecting block 54 is fixed at the bottom of the clamping frame 53, and the connecting block 54 is threadedly sleeved on the surface of the bidirectional screw 55. The bottom of the current transformer body 2 is placed on the bearing table 51. By rotating the bidirectional screw 55, the connecting block 54 cooperates with the bidirectional screw 55 to drive the clamping frame 53 to move inside the sliding frame 52, clamping and fixing both sides of the bottom of the current transformer body 2, and maintaining the stability of the current transformer body 2 during testing and rotation.

[0043] As Figure 7As shown in the figure, in this embodiment, electric push rods 71 are fixed to the tops of both ends of the plug-in frame 7, and the extending ends of the electric push rods 71 are fixedly connected to the side of the test bench 1. The plug-in frame 7 is slidably inserted into the side of the test bench 1. A sensor end 73 is installed at the front end of the partial discharge tester 72. The partial discharge tester 72 is a prior art and cooperates with the sensor end 73 to detect the discharge signal around the mutual inductor. When the mutual inductor body 2 rotates to the middle position of the test bench 1 along with the driving assembly 4, at this time, the insulation testers 11 and insulation resistance meters 12 on both sides are relatively far from the partial discharge tester 72, so they will not interfere with the partial discharge test. Through the push of the electric push rod 71, the plug-in frame 7 is inserted along both sides of the test bench 1, and the sensor end 73 is brought into contact with the outer surface of the mutual inductor body 2 to conduct a discharge test.

[0044] When using the device, the bottom of the mutual inductor body 2 is placed on the bearing platform 51. The bidirectional screw 55 is rotated, and the connecting block 54 cooperates with the bidirectional screw 55 to drive the clamping frame 53 to move along the inside of the sliding frame 52, clamping and fixing both sides of the bottom of the mutual inductor body 2 to maintain the stability of the mutual inductor body 2 during the test and rotation process. When the motor in the driving base 41 drives the first gear 42 to rotate, the first gear 42 meshes with the toothed plate 43. Then, the test bench 1 moves horizontally under the action of the bottom support columns 14 and the moving wheels 15. The insulation testers 11 and insulation resistance meters 12 at both ends of the test bench 1 approach the mutual inductor body 2 alternately through the meshing of the first gear 42 and the toothed plate 43 in different directions and complete the connection test. There will be no interference between the two tests. The moving groove 13 on the surface of the test bench 1 can allow the mutual inductor body 2 and the driving assembly 4 to pass through along the moving groove 13 when the test bench 1 moves, without moving interference.

[0045] The second gear 44 rotates synchronously with the first gear 42, driving one of the winding seats 31 on both sides of the driving base 41 to wind and the other to unwind, always maintaining opposite actions. The connecting wire at the end farthest from the mutual inductor body 2 is stored in the storage frame 6 under the limitation of the connecting plate 35 and the limiting ring 36. During this process, under the elastic force of the return spring 34, the connecting wires of the unused test instruments are protected. And the connecting wires of the test instruments close to the mutual inductor body 2 are pulled by the traction rope 32 wound by the winding seat 31. The traction rope 32 pulls the connecting plate 35 to slide downward along the sliding rod 33 through the sliding sleeves 37 at both ends, releasing the reserved length of the connecting wire. Coupled with the mutual approach of the test instrument and the mutual inductor body 2, it is convenient for the connection test between the two.

[0046] When the transformer body 2 rotates to the middle position of the test bench 1 along with the drive assembly 4, at this time, the insulation testers 11 and insulation resistance meters 12 on both sides are far away from the partial discharge tester 72, so they will not interfere with the partial discharge test. Through the push of the electric push rod 71, the insertion frame 7 is inserted along both sides of the test bench 1, and the sensor end 73 is brought into contact with the outer surface of the transformer body 2 for discharge testing, achieving efficient insulation detection of the transformer body 2.

[0047] As Figures 1-7 shown, Embodiment 2 of the present invention provides a method for insulating detection of a voltage transformer, and the detection method includes the following steps:

[0048] Step 1, Preparation: Disconnect the connection between the voltage transformer body 2 and the system, and fully discharge the transformer body 2. Then, prepare tools such as an insulation tester 11, a partial discharge tester 72, an insulation resistance meter 12, and connection wires. The voltage transformer 2 is clamped on the clamping assembly 5 of the test bench 1, and the drive assembly 4 drives the voltage transformer body 2 to rotate and approach the insulation tester 11, the partial discharge tester 72, and the insulation resistance meter 12 respectively, so that its front faces the insulation tester 11, the partial discharge tester 72, and the insulation resistance meter 12, and is connected by means of connection wires;

[0049] Step 2, Insulation resistance test: Use the insulation resistance meter 12 to test the insulation resistance of the voltage transformer body 2. Connect the positive and negative poles of the insulation resistance meter to the winding and the outer shell of the voltage transformer body 2 respectively, read the insulation resistance value, and if the insulation resistance is greater than 1000 MΩ, it is regarded as normal;

[0050] Step 3, Dielectric loss tangent value test: Use the insulation tester 11 to test the dielectric loss tangent value of the voltage transformer body 2. Connect the electrodes of the insulation tester 11 to the winding and the outer shell of the voltage transformer body 2 respectively, set an appropriate test voltage, read the dielectric loss tangent value, and if the dielectric loss tangent value is less than the specified value, it indicates good insulation performance;

[0051] Step 4, Partial discharge test: Detect the partial discharge condition inside the voltage transformer body 2 through the partial discharge tester 72. Press the sensor of the partial discharge tester 72 tightly against the outer shell of the voltage transformer body 2, and observe the partial discharge signal. If the partial discharge signal is weak, it indicates good insulation performance;

[0052] Step 5, Analysis of test results: According to the test data, compare the standard values such as the rated insulation resistance and dielectric loss tangent value of the voltage transformer to judge whether its insulation performance is qualified. If the test result is unqualified, the voltage transformer should be repaired or replaced immediately.

[0053] Compared with the prior art, the beneficial effects of the present invention at least include:

[0054] 1. The bottom of the current transformer body of the present invention is placed on the bearing platform. By rotating the bidirectional screw, the connecting block cooperates with the bidirectional screw to drive the clamping frame to move along the inside of the sliding frame, clamping and fixing the two sides of the bottom of the current transformer body, and maintaining the stability of the current transformer body during the testing and rotation processes.

[0055] 2. When the first gear rotates in the present invention, the second gear meshes with the first gear and rotates synchronously, driving one of the winding seats on both sides of the driving base to wind and the other to unwind, always maintaining opposite actions. The connecting wire at the end farthest from the current transformer body is stored inside the storage frame under the limitation of the connecting plate and the limit ring. During this process, under the elastic force of the return spring, the connecting wires of the unused testing instruments are protected. And the connecting wires of the testing instruments close to the current transformer body are pulled by the traction ropes wound by the winding seats. The traction ropes pull the connecting plate to slide downward along the sliding rods through the sliding sleeves at both ends, releasing the reserved length of the connecting wires. In addition, since the detection instrument and the current transformer body approach each other, it is convenient to connect and test the two.

[0056] 3. When the motor in the driving base drives the first gear to rotate in the present invention, the first gear meshes with the toothed plate. Then, the detection table moves horizontally under the action of the bottom support columns and the moving wheels. The insulation testers and insulation resistance meters at both ends of the detection table alternately approach the current transformer body and complete the connection test. There will be no interference between the two tests. The moving grooves on the surface of the detection table can allow the current transformer body and the driving assembly to pass through along the moving grooves when the detection table moves, without moving interference.

[0057] 4. Compared with the prior art, the present invention can drive the rotation of the current transformer and the movement of the detection table through the action of the driving assembly, align the front of the current transformer with the detection equipment, and approach the detection equipment, so as to facilitate the connection of the current transformer with different types of detection instruments. The wire bundling assembly can cooperate with the driving assembly to store the connecting wires, avoiding chaos caused by too many test wires on the detection table, facilitating the switching of detection equipment, and improving the detection efficiency.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A voltage transformer insulation detection device, comprising a detection table (1), characterized in that: At the top of one end of the detection table (1), an insulation tester (11) is fixedly installed, and at the top of the other end of the detection table (1), an insulation resistance meter (12) is fixedly installed for the insulation detection of the voltage transformer; At the middle bottom of the detection table (1), a driving assembly (4) is provided. The driving assembly (4) includes a driving base (41). A motor is installed inside the driving base (41), and a clamping assembly (5) is installed at the top of the driving base (41) to maintain the stability during the testing and rotation of the voltage transformer; The clamping assembly (5) includes a bearing table (51). The bottom of the bearing table (51) is fixedly connected to the output end of the motor of the driving base (41). Clamping frames (53) are provided on both sides of the bearing table (51). A transformer body (2) is placed on the top of the clamping frames (53) and the bearing table (51). Connecting wires are provided on the surfaces of the insulation tester (11) and the insulation resistance meter (12) facing the transformer body (2). The insulation tester (11) and the insulation resistance meter (12) are electrically connected to the transformer body (2) through the connecting wires. And at the positions of the detection table (1) corresponding to the connecting wires on both sides, a wire bundling assembly (3) is provided for facilitating the connection and testing between the voltage transformer and the detection instrument; The wire bundling assembly (3) includes a connecting plate (35). Two limiting rings (36) are symmetrically fixed on the surface of the connecting plate (35). The connecting wires of the insulation tester (11) and the insulation resistance meter (12) both slide through the limiting rings (36). An insertion frame (7) is slidably inserted on one side of the detection table (1), and a partial discharge tester (72) is fixed at the top of the insertion frame (7).

2. The voltage transformer insulation detection device according to claim 1, characterized in that: The driving assembly (4) further includes a first gear (42). The first gear (42) is rotatably installed on the top of the driving base (41) through a bearing, and the first gear (42) is fixedly connected to the output end of the motor inside the driving base (41). A moving groove (13) is formed on the surface of the detection table (1), and a toothed plate (43) is fixed on one inner wall of the moving groove (13). The first gear (42) is meshed with the toothed plate (43).

3. The voltage transformer insulation detection device according to claim 2, characterized in that: The wire bundling assembly (3) further includes a winding base (31). The winding bases (31) are fixed on both sides of the driving base (41), and a second gear (44) is fixed on the top of the winding shaft of the winding base (31). The second gear (44) is meshed with the first gear (42).

4. The voltage transformer insulation detection device according to claim 3, characterized in that: A traction rope (32) is wound on the winding shaft of the winding base (31), and the other end of the traction rope (32) is fixedly connected to the connecting plate (35).

5. The voltage transformer insulation detection device according to claim 4, characterized in that: Both ends of the connecting plate (35) are fixed with sliding sleeves (37). At positions corresponding to both ends of the connecting plate (35) on the top of the detection table (1), sliding rods (33) are fixed. The sliding sleeves (37) are slidably sleeved on the sliding rods (33). A return spring (34) is sleeved on the surface of the sliding rod (33) at the bottom of the sliding sleeve (37), and both ends of the return spring (34) are fixedly connected to the bottom of the sliding rod (33) and the sliding sleeve (37).

6. The insulation detection device for a voltage transformer according to claim 1, characterized in that: The clamping assembly (5) further includes a sliding frame (52). Sliding frames (52) are fixed at both sides of the bearing table (51) at the bottom of the clamping frame (53). A bidirectional screw rod (55) is rotatably installed inside the sliding frame (52) through a bearing. A connecting block (54) is fixed at the bottom of the clamping frame (53), and the connecting block (54) is threadedly sleeved on the surface of the bidirectional screw rod (55).

7. The insulation detection device for a voltage transformer according to claim 1, characterized in that: Both top ends of the plug-in frame (7) are fixed with electric push rods (71). The extending ends of the electric push rods (71) are fixedly connected to the side of the detection table (1). The plug-in frame (7) is slidably inserted into the side of the detection table (1). A sensor end (73) is installed at the front end of the partial discharge tester (72).

8. The insulation detection device for a voltage transformer according to claim 1, characterized in that: Receiving frames (6) are fixed at the tops of both the insulation tester (11) and the insulation resistance meter (12) on the top of the connecting line. An opening is provided at the lower end of the receiving frame (6). The connecting line joint end at the farther end of the voltage transformer body (2) is received inside the receiving frame (6).

9. The insulation detection device for a voltage transformer according to claim 1, characterized in that: Two groups of support columns (14) are fixed at both ends of the bottom of the detection table (1), and moving wheels (15) are rotatably installed at the bottoms of the support columns (14).

10. An insulation detection method for a voltage transformer, which implements an insulation detection device for a voltage transformer according to any one of claims 1-9, characterized in that: It includes the following steps: Preparation work: Disconnect the connection between the voltage transformer and the system, and discharge the voltage transformer. After discharging, clamp the voltage transformer on the clamping assembly of the detection table, drive the assembly to drive the voltage transformer to rotate, and connect the insulation tester, partial discharge tester, and insulation resistance meter respectively through the connecting line; Insulation resistance test: Use the insulation resistance meter to test the insulation resistance of the voltage transformer. Connect the positive and negative poles of the insulation resistance meter between the winding and the shell of the voltage transformer respectively, and read the insulation resistance value; Dielectric loss tangent value test: Use the insulation tester to test the dielectric loss tangent value of the voltage transformer. Connect the electrodes of the tester between the winding and the shell of the voltage transformer respectively, set the test voltage, and read the dielectric loss tangent value; Partial discharge test: Detect the partial discharge situation inside the voltage transformer through a partial discharge tester. Attach the sensor of the tester to the outer shell of the voltage transformer and observe the partial discharge signal; Analysis of test results: According to the test data, compare with the standard value of the voltage transformer to judge whether its insulation performance is qualified.

Images