Lead wire device for three-phase short circuit of transformer

Abstract

The invention discloses a lead wire device for three-phase short circuit of a transformer, and relates to the technical field of lead wires, the lead wire device comprises an operating rod and a clamping mechanism, the clamping mechanism comprises an insulating rod, a screw rod, a fixed chuck and a movable chuck, the fixed chuck is fixedly installed at the top of the screw rod, the movable chuck is slidably sleeved on the screw rod, and the insulating rod is connected with the operating rod. The insulating rod is in threaded connection and cooperation with the screw rod through the threaded sleeve so as to drive the movable chuck and the fixed chuck to be opened and closed. The operating rod and the insulating rod are rotationally connected through a swing mechanism so as to adjust the angle of the clamping mechanism. By rotating the operating rod, the movable chuck can abut against the grading ring upwards, the movable chuck and the fixed chuck are matched to lock and clamp the grading ring, connection is firm and stable, the problems of swinging, slipping, virtual connection and the like are solved, wire leading operation can be conducted on the ground, and safety is high; and the operating rod and the insulating rod are connected through the swing mechanism, so that the clamping angle of the clamping mechanism can be adjusted, and the grading ring can be clamped conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of lead wires, in particular to a lead wire device for short-circuiting three-phase transformers. Background Art

[0002] During the insulation inspection of a three-phase transformer, three phases need to be short-circuited. Since the terminal board of the three-phase transformer is at a high place, there are two main existing wiring methods: one is to use a boom truck to lift the operator to the vicinity of the terminal board, and then wrap the short-circuit wires around the equalizing rings (or leads) of each phase; the other is to use an operating lever to hook the aerial wiring clamps to the equalizing rings of each phase, and the wires of each aerial wiring clamp are short-circuited on the ground.

[0003] Among the above-mentioned existing wiring methods, the former has a firm short-circuit connection and will not cause loose connection, but it requires the use of large equipment such as a boom truck, and there is a certain risk of high-altitude operation; the latter does not require operators to work at high altitude, is safer, and does not require large lifting equipment, but the high-altitude wiring clamps are usually clamped to the equalizing ring (or lead) through an elastic hook, and there is a certain probability of swinging, slipping, loose connection and other hidden dangers. Summary of the Invention

[0004] The object of the present invention is to provide a lead-in wiring device for short-circuiting three-phase transformers, so as to solve the problem in the prior art that it is difficult to achieve both lead-in wiring stability and operational safety.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a lead-in device for short-circuiting three-phase transformers, comprising an operating rod and a clamping mechanism, wherein the clamping mechanism comprises an insulating rod, a screw rod, a fixed chuck and a movable chuck, wherein the fixed chuck is fixedly mounted on the top of the screw rod, and the movable chuck is slidably sleeved on the screw rod, and the insulating rod is threadedly connected to the screw rod through a screw sleeve to drive the movable chuck and the fixed chuck to open and close; the operating rod and the insulating rod are rotatably connected through a swinging mechanism to adjust the angle of the clamping mechanism.

[0006] Furthermore, the top of the insulating rod and the bottom of the dynamic chuck are in rolling abutment fit via a thrust ball bearing.

[0007] Furthermore, an elastic unit is provided between the screw and the dynamic chuck, and the elastic force of the elastic unit acts upward on the dynamic chuck; the bottom of the dynamic chuck is rotatably connected to a rotating ring, and the bottom of the rotating ring is fixedly connected to a fan ring, and there is a gap between the fan ring and the bottom surface of the rotating ring to form an annular space, and the fan ring is provided with ribs for dividing the annular space; the screw sleeve is fixedly connected to an abutment ring, and the inner wall of the abutment ring is provided with a protrusion, and the thickness of the protrusion is less than the height of the annular space, and the protrusion can enter the annular space and abut against the rib.

[0008] Furthermore, the elastic unit includes a compression spring placed in the inner cavity of the screw, the top of the compression spring abuts against the dynamic chuck, and the bottom abuts against the end plug at the bottom of the screw. Furthermore, a sliding groove with only a bottom opening is axially provided on the inner wall of the abutment ring, and the protrusion is slidably connected to the sliding groove. An elastic member is also provided on the abutment ring, and the elastic force of the elastic member acts upward on the protrusion.

[0009] Furthermore, the elastic member includes a second compression spring placed in the slide groove, the top of the second compression spring abuts against the protrusion, the bottom of the slide groove is screwed with a limiting bolt, and the bottom of the second compression spring abuts against the limiting bolt.

[0010] Furthermore, a guide groove is provided on the screw rod along the axial direction, a guide key is slidably fitted in the guide groove, and the guide key is fixedly connected to the dynamic chuck.

[0011] Furthermore, the swing mechanism includes two connecting seats and a clutch, and the two connecting seats are rotatably connected through an axis core. The clutch includes two toothed discs with opposite tooth surfaces and movably sleeved on the axis core, one of the connecting seats is fixedly connected to the insulating rod and fixedly connected to one of the toothed discs, and the other connecting seat is fixedly connected to the operating rod and slidably connected to the other toothed disc; a first compression spring is movably sleeved on the axis core, and the two ends of the first compression spring are respectively abutted against a toothed disc, and a nut is also threadedly connected to the axis core. By tightening the nut, the first compression spring can be compressed to store energy and the two toothed discs can be snapped into engagement.

[0012] Furthermore, the fixed clamping head includes an upper clamping seat connected to the screw rod and an upper clamping block fixedly connected to the upper clamping seat, and the bottom of the upper clamping block has a clamping opening and is provided with teeth.

[0013] Furthermore, the bottom of the operating rod is provided with a terminal electrically connected to the fixed clamp and the movable clamp, and a butterfly nut is screwed on the terminal; the three phases of the transformer are electrically connected respectively through the three lead-in wiring devices for short-circuiting the three phases of the transformer, and the terminal of the three lead-in wiring devices for short-circuiting the three phases of the transformer are short-circuited through short-circuiting wires, and the short-circuiting wires are fixed to the terminal by butterfly nuts.

[0014] Compared to the prior art, the present invention provides a wiring device for short-circuiting three-phase transformers. An operating lever is used to lift a clamping mechanism to the transformer's terminal block. The fixed clamp is hooked onto a voltage-equalizing ring (or lead). The operating lever is then rotated to drive the insulating rod and the threaded sleeve relative to the screw, causing the insulating rod and the threaded sleeve to move upward along the screw, forcing the movable clamp upward against the voltage-equalizing ring. The movable and fixed clamps cooperate to lock the voltage-equalizing ring, creating a secure and stable connection. This eliminates problems such as swaying, slipping, and loose connections, allowing wiring operations to be performed on the ground with increased safety. Furthermore, the operating lever and the insulating rod are connected via a swing mechanism, enabling the clamping mechanism's angle to be adjusted, making it easier to clamp the voltage-equalizing ring while avoiding obstacles or unusual terrain. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly describe the embodiments of the present application or the technical solutions in the prior art, a brief introduction to the drawings required for use in the embodiments is given below.

[0016] Figure 1 A schematic diagram of the overall structure provided for the embodiment; Figure 2 A schematic diagram of the structure of the connection of multiple operating rods provided in the embodiment; Figure 3 A schematic structural diagram of a swing mechanism provided in an embodiment; Figure 4 A schematic diagram of the structure of the clamping mechanism provided in the embodiment when it is opened; Figure 5 A top view of the structure of the clamping mechanism provided in the embodiment when it is opened; Figure 6 For the Figure 5 Structural cross-section view along line AA; Figure 7 for Figure 6 A magnified view of the structure at B in the middle; Figure 8 A schematic diagram of the structure of the bottom surface of the protrusion abutting against the top surface of the fan ring provided in the embodiment; Figure 9 A schematic diagram of the connection structure of the rotating ring, fan ring and ribs provided in the embodiment; Figure 10 A schematic diagram of the connection structure between the abutment ring and the protrusion provided in the embodiment; Figure 11 A schematic diagram of the structure of the clamping mechanism provided in the embodiment when pre-clamping a lead wire; Figure 12 A schematic diagram of the structure of the clamping mechanism provided in the embodiment when locking and clamping the lead wire; Figure 13 A cross-sectional view of the structure of the clamping mechanism provided in the embodiment when closed; Figure 14 for Figure 13 A magnified view of the structure at C in the middle; Figure 15 A schematic diagram of the structure of the protrusion provided in the embodiment entering the annular space from one side; Figure 16 A schematic diagram of the structure of the embodiment in which the side surface of the protrusion abuts against the side surface of the fan ring; Figure 17 A schematic diagram of the structure in which the top surface of the protrusion abuts against the bottom surface of the fan ring provided in the embodiment; Figure 18 A schematic diagram of the structure of the embodiment in which the protrusion enters the annular space from the other side during disassembly; Figure 19 A structural cross-sectional view of a clamping mechanism provided in another embodiment.

[0017] Description of reference numerals: 1. Operating lever; 2. Swing mechanism; 21. Connecting seat; 22. Shaft core; 23. Toothed disc; 24. First compression spring; 25. Nut; 3. Clamping mechanism; 31. Insulating rod; 32. Screw sleeve; 33. Screw rod; 34. Shaft retaining ring; 35. Fixed chuck; 351. Upper chuck seat; 352. Upper clamping block; 36. Moving chuck; 361. Lower chuck seat; 362. Lower clamping block; 37. Guide key; 38. Guide groove; 39. Thrust ball bearing; 310. Compression spring; 311. End plug; 312. Rotating ring; 313. Fan ring; 314. Rib; 315. Abutting ring; 316. Slide groove; 317. Bump; 318. Second compression spring; 319. Limit bolt; 320. Telescopic sleeve; 4. Butterfly nut; 5. Wire; 6. Connecting wire. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] See also Figures 1-19The embodiment of the present invention provides a lead-in device for short-circuiting three-phase transformers, comprising an operating rod 1 and a clamping mechanism 3. The clamping mechanism 3 comprises an insulating rod 31, a screw rod 33, a fixed clamp 35 and a movable clamp 36. The operating rod 1 is composed of a multi-section rod body connected together, which is easy to assemble. The fixed clamp 35 and the movable clamp 36 are arranged in a mirror image, and a telescopic sleeve 320 is provided between them. The telescopic sleeve 320 can cover the screw rod 33. The fixed clamp 35 comprises an upper clamp seat 351 and an upper clamp block 352. The upper clamp block 352 is fixedly connected to the bottom of the upper clamp seat 351. The bottom of the upper clamp block 352 has a clamping opening and is provided with teeth. The upper clamp seat 351 is fixedly installed on the top of the screw rod 33. It can be welded or detachably clamped, and is limited by the shaft retaining ring 34. The dynamic chuck 36 includes a lower clamping seat 361 and a lower clamping block 362. The lower clamping block 362 is fixedly connected to the top of the lower clamping seat 361. The top of the lower clamping block 362 has a clamping opening and is provided with teeth. The lower clamping seat 361 is slidably sleeved on the screw rod 33 through the through hole thereon. A guide groove 38 is provided in the axial direction of the screw rod 33. A guide key 37 is slidably fitted in the guide groove 38. The guide key 37 is fixedly connected to the lower clamping seat 361 of the dynamic chuck 36, so that the dynamic chuck 36 can only move axially along the screw rod 33, but will not rotate circumferentially along the screw rod 33. The top of the insulating rod 31 is fixedly connected to a coaxial screw sleeve 32. The screw sleeve 32 has an internal thread and is threadedly connected to the screw rod 33. The top of the insulating rod 31 or the screw sleeve 32 abuts and fits with the bottom of the dynamic chuck 36, such as Figure 19 As shown, a thrust ball bearing 39 is provided between the two to reduce wear. In addition, the insulating rod 31 is rotatably connected to the operating rod 1 via the swing mechanism 2, and the rotation angle is usually designed to be within 45°.

[0020] When the transformer is connected to the wiring board, the clamping mechanism 3 is lifted to the terminal board of the transformer through the operating lever 1, and the fixed clamp 35 is hooked on the voltage-grading ring to ensure that the fixed clamp 35 cannot rotate due to the resistance limit between the fixed clamp 35 and the voltage-grading ring (the fixed clamp 35 can be pressed down with the help of the gravity of the device itself), and then the operating lever 1 is rotated to drive the insulating rod 31 and the screw sleeve 32 to rotate relative to the screw rod 33, so that the insulating rod 31 and the screw sleeve 32 move upward along the screw rod 33, and the screw sleeve 32 abuts the movable clamp 36 and drives the movable clamp 36 to slide up along the screw 33, so that the movable clamp 36 is tightened upward to the voltage-grading ring, that is, the movable clamp 36 cooperates with the fixed clamp 35 to be locked to the voltage-grading ring, and the connection is firm and stable, which solves the problems of swinging, slipping, and virtual connection. The wiring operation can be carried out on the ground with high safety. It should be noted that when the angle between the clamping mechanism 3 and the operating rod 1 is large, since the axis of rotation of the operating rod 1 and the insulating rod 31 is not vertical and is constantly changing, the fixed clamp 35 shakes more severely when the operating rod 1 is rotated. In addition to using the gravity of the device itself to press the fixed clamp 35 down on the equalizing ring, a downward pulling force can also be appropriately applied to the operating rod 1 to increase the friction between the fixed clamp 35 and the equalizing ring, so as to avoid the fixed clamp 35 from detaching from the equalizing ring and rotating with the operating rod 1, which causes the clamping mechanism 3 to be unable to clamp the equalizing ring.

[0021] The swing mechanism 2 includes two connecting seats 21 and a clutch. One connecting seat 21 is fixedly connected to the bottom of the insulating rod 31, and the other connecting seat 21 is fixedly connected to the top of the operating rod 1. The two connecting seats 21 are rotatably connected by the shaft core 22. This allows the clamping mechanism 3 to swing relative to the operating rod 1, thereby adjusting the angle of the clamping mechanism 3, making it convenient to avoid obstacles or special terrain to clamp the equalizing ring. The function of the clutch is to achieve rotation and locking between the two connecting seats 21. The clutch includes two toothed discs 23 that are movably mounted on the shaft core 22. The tooth surfaces of the two toothed discs 23 are opposite. One of the toothed discs 23 is fixedly connected to one of the connecting seats 21 (this connecting seat 21 can be the connecting seat 21 connected to the insulating rod 31 or the connecting seat 21 connected to the operating rod 1), and the other toothed disc 23 is slidably connected to the other connecting seat 21 along the axial direction of the shaft core 22. A first compression spring 24 is provided on the shaft core 22. Each end of the first compression spring 24 engages a toothed disc 23. Therefore, when the second spring force is released, the two toothed discs 23 can be separated, allowing the two connecting seats 21 to rotate relative to each other. A nut 25 is also threaded onto the shaft core 22. Tightening the nut 25 not only allows one of the connecting seats 21 to slide along the shaft core 22, allowing the two toothed discs 23 to engage, but also compresses the first compression spring 24 to store energy. This prevents the two connecting seats 21 from rotating relative to each other after the two toothed discs 23 are engaged, achieving a locking effect between the two connecting seats 21. This locks the angle of the clamping mechanism 3 relative to the operating rod 1. To adjust the angle of the clamping mechanism 3 again, simply loosen the nut 25.

[0022] The operating rod 1 and the insulating rod 31 are hollow and have wires passing through them. The wires pass through the screw 33 and are connected to the upper clamping block 352 and the lower clamping block 362 respectively. The wires are spirally wound multiple times inside the insulating rod 31. The wires will not be damaged when the operating rod 1 and the insulating rod 31 rotate relative to the screw 33, the movable clamp 36 and the fixed clamp 35. Figure 2 The wires 5 at the joints of the multi-section operating rods 1 are connected by plugging, so that the wires 5 between the two adjacent sections of the operating rods 1 are electrically connected. Figure 3 The insulating rod 31 and the operating rod 1 are each provided with a socket for connecting to their respective wires. A connecting wire 6 with plugs at each end is provided. One end of the connecting wire 6 is inserted into the socket on the insulating rod 31, and the other end is inserted into the socket on the operating rod 1, thereby electrically connecting the wires in the insulating rod 31 with the wires in the operating rod 1. The bottom section of the operating rod 1 is provided with a terminal for electrically connecting to the wires, and a butterfly nut 4 is threaded onto the terminal terminal. When the three phases of the transformer are connected through the three lead-in wiring devices, the terminal terminals of each lead-in wiring device are connected by a shorting wire. The end of the shorting wire is wrapped around the connecting terminal. The shorting wire is fixed by tightening the butterfly nut 4, thereby maintaining the short circuit between the three lead-in wiring devices.

[0023] In another embodiment provided by the present invention, an elastic unit is provided between the screw rod 33 and the dynamic chuck 36. The elastic force of the elastic unit acts upward on the dynamic chuck 36. The elastic unit is preferably a compression spring 310. In addition to the guide groove 38, the screw rod 33 also has an inner cavity extending through the bottom of the screw rod 33 and the guide groove 38. The compression spring 310 is disposed within the inner cavity and the guide groove 38. The top of the compression spring 310 abuts against the dynamic chuck 36, and the bottom abuts against an end plug 311 at the bottom of the screw rod 33. To prevent the compression spring 310 from bending due to inelastic deformation, a telescopic rod may be added to the interior of the compression spring 310, with its ends respectively connecting the bottom of the screw rod 33 and the top of the guide groove 38, to maintain the posture of the compression spring 310.

[0024] The bottom of the dynamic chuck 36 is rotatably connected to a rotating ring 312, and the bottom of the rotating ring 312 is fixedly connected to a fan ring 313. There is a gap between the fan ring 313 and the bottom surface of the rotating ring 312 to form an annular space. The height of the annular space should be greater than the pitch of the screw 33. The fan ring 313 is provided with ribs 314 for dividing the annular space, that is, the ribs 314 divide the annular space into two parts (such as Figure 9 ), in order to distinguish and facilitate description, one part is called the first space ( Figure 8 、 Figures 15-18 The space on the right side of the middle rib 314), and the other part is called the second space ( Figure 8 、 Figures 15-18 The insulating rod 31 or the screw sleeve 32 is coaxially fixedly connected to an abutment ring 315. The diameter of the abutment ring 315 matches the diameter of the rotating ring 312 but is larger than the diameter of the sector ring 313. A protrusion 317 is elastically and slidably connected to the inner wall of the abutment ring 315 along the axial direction. The thickness of the protrusion 317 should be less than the height of the annular space. The protrusion 317 can enter the annular space and abut against the rib 314. The friction between the protrusion 317 and the sector ring 313 is less than the friction between the rotating ring 312 and the dynamic chuck 36. A ball can be provided at the bottom of the protrusion 317 to generate rolling friction to reduce the friction between the protrusion 317 and the upper surface of the sector ring 313.

[0025] For the design of the specific connection between the protrusion 317 and the abutment ring 315, refer to Figure 10A sliding groove 316 is axially defined on the inner wall of the abutment ring 315. The sliding groove 316 is open only at the bottom and closed at the top. A slider that matches the sliding groove 316 is provided on the protrusion 317. The protrusion 317 is slidably connected to the sliding groove 316 via the slider. The abutment ring 315 is also provided with an elastic member, the elastic force of which acts upward on the protrusion 317. The elastic member is specifically a second compression spring 318, which is positioned within the sliding groove 316. The top of the second compression spring 318 abuts the bottom of the slider. A limiting bolt 319 is screwed to the bottom of the sliding groove 316, and the bottom of the second compression spring 318 abuts and cooperates with the limiting bolt 319.

[0026] In this embodiment, after the fixed chuck 35 is hooked onto the pressure-equalizing ring, a slight rotation of the operating rod 1 can cause the dynamic chuck 36 to move upward to pre-clamp the pressure-equalizing ring. Then, the operating rod 1 can be further rotated so that the screw sleeve 32 presses the dynamic chuck 36 upward, thereby achieving a secure locking of the dynamic chuck 36 and the fixed chuck 35 with the pressure-equalizing ring. As a result, during the rotation of the operating rod 1, there is no need to apply a downward pulling force to the operating rod 1 to maintain the stability of the fixed chuck 35, and there is no need to continuously monitor whether the fixed chuck 35 rotates relative to the pressure-equalizing ring. This facilitates the rotation of the operating rod 1, especially when the angle between the clamping mechanism 3 and the operating rod 1 is large, making the rotation of the operating rod 1 more convenient. Moreover, during the rotation of the operating rod 1, the fixed chuck 35 will not repeatedly rub against the pressure-equalizing ring and damage the pressure-equalizing ring.

[0027] Before clamping the equalizing ring, refer to Figure 4-Figure 7 , the dynamic chuck 36 and the fixed chuck 35 need to be kept separated, and the protrusion 317 on the abutment ring 315 is located in the second space of the annular space (such as Figure 8 ), the compression spring 310 is in a state of large deformation and compression energy storage. When the fixed clamp 35 is hooked onto the pressure equalizing ring, it rotates counterclockwise (relative to Figure 6-Figure 8 (For example, rotating the operating rod 1 slightly drives the screw sleeve 32 and the abutment ring 315 to rotate, so that the protrusion 317 rotates out of the second space. When the protrusion 317 no longer blocks the fan ring 313, the elastic potential energy of the compression spring 310 is released, driving the movable clamp 36 and the rotating ring 312 to move upward along the screw rod 33 until the movable clamp 36 abuts the equalizing ring (such as Figure 11 ), and in this state, the compression spring 310 is still in a compressed deformation state, and still exerts a large upward force on the dynamic clamp 36. The dynamic clamp 36 squeezes the equalizing ring upward, and the dynamic clamp 36 cooperates with the fixed clamp 35 to form a pre-clamping of the equalizing ring, such as Figure 12-14 shown.

[0028] Then continue to rotate the operating rod 1 counterclockwise. Due to the pre-clamping of the dynamic clamp 36 and the fixed clamp 35 on the equalizing ring, it is difficult for the dynamic clamp 36 and the fixed clamp 35 to separate from the equalizing ring, so that the fixed clamp 35, the dynamic clamp 36 and the screw 33 will not rotate. When the rotating operating rod 1 is threadedly engaged with the screw sleeve 32 and the screw 33 to make the abutment ring 315 rise to the vicinity of the dynamic clamp 36, three types of docking situations may occur between the protrusion 317 and the fan ring 313: the first situation is that the protrusion 317 is directly screwed into the second space (such as Figure 15 ), then the side of the protrusion 317 abuts against the rib 314, and the protrusion 317 drives the rotating ring 312 to rotate together through the rib 314. At the same time, the protrusion 317 moves upward relative to the rib 314 until the abutting ring 315 abuts against the rotating ring 312, so that the dynamic clamping head 36 and the fixed clamping head 35 firmly clamp the pressure equalizing ring; the second situation is that the side of the protrusion 317 abuts against the side of the fan ring 313 (such as Figure 16 ), then the protrusion 317 drives the rotating ring 312 to rotate together through the fan ring 313, and the protrusion 317 moves upward relative to the fan ring 313 until the bottom of the protrusion 317 is higher than the top of the fan ring 313, and the protrusion 317 enters the second space and abuts against the rib 314, and then continues to drive the rotating ring 312 to rotate together through the rib 314 until the abutting ring 315 abuts against the rotating ring 312, so that the dynamic clamp 36 and the fixed clamp 35 firmly clamp the pressure equalizing ring; the third case is that the protrusion 317 rotates to the bottom of the fan ring 313 and moves upward to abut against the bottom of the fan ring 313 during the subsequent rotation process (such as Figure 17 When the locking cam 315 is in the unlocking state, the locking cam 317 is in the unlocking state, and the locking cam 317 is in the unlocking state, so that the locking cam 315 is unlocked.

[0029] When the lead wire device needs to be removed from the equalizing ring, first rotate the operating rod 1 clockwise so that the protrusion 317 rotates from the second space to the first space while descending. Figure 18), after entering the first space, the protrusion 317 contacts the rib 314, driving the rotating ring 312 to rotate clockwise. The protrusion 317 slides down relative to the rib 314 until the bottom surface of the protrusion 317 contacts the top surface of the fan ring 313. The protrusion 317 then drives the fan ring 313 to rotate and descend. The fan ring 313 then drives the movable clamp 36 to descend through the rotating ring 312 until the movable clamp 36 completely disengages from the fixed clamp 35, releasing the pressure-equalizing ring. The descending movable clamp 36 further compresses the compression spring 310, causing the compression spring 310 to accumulate energy. At this point, the clamping mechanism 3 has returned to the state before clamping the pressure-equalizing ring, and the cycle operation can be repeated.

[0030] The above description of certain exemplary embodiments of the present invention should not be construed as limiting the scope of protection of the claims of the present invention. For those skilled in the art, the described embodiments may be modified in other different ways without departing from the spirit and scope of the present invention.

Claims

1. A wiring device for short-circuiting three-phase transformers, comprising an operating lever and a clamping mechanism, characterized in that: The clamping mechanism includes an insulating rod, a screw, a fixed chuck and a movable chuck, wherein the fixed chuck is fixedly mounted on the top of the screw, the movable chuck is slidably sleeved on the screw, and the insulating rod is threadedly connected to the screw through a screw sleeve to drive the movable chuck and the fixed chuck to open and close; The operating rod and the insulating rod are rotatably connected via a swing mechanism to adjust the angle of the clamping mechanism.

2. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 1, characterized in that: The top of the insulating rod and the bottom of the dynamic clamp are in rolling contact with each other through a thrust ball bearing.

3. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 1, characterized in that: An elastic unit is provided between the screw and the dynamic chuck, and the elastic force of the elastic unit acts upward on the dynamic chuck; The bottom of the dynamic chuck is rotatably connected to a rotating ring, and the bottom of the rotating ring is fixedly connected to a fan ring. There is a gap between the fan ring and the bottom surface of the rotating ring to form an annular space, and the fan ring is provided with ribs for dividing the annular space. An abutment ring is fixedly connected to the screw sleeve, and a protrusion is provided on the inner wall of the abutment ring. The thickness of the protrusion is smaller than the height of the annular space. The protrusion can enter the annular space and abut against the rib.

4. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 3, characterized in that: The elastic unit comprises a compression spring placed in the inner cavity of the screw, the top of the compression spring abuts against the dynamic chuck, and the bottom abuts against the end plug at the bottom of the screw.

5. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 3, characterized in that: A sliding groove with only a bottom opening is axially provided on the inner wall of the abutment ring. The protrusion is slidably connected to the sliding groove. An elastic member is also provided on the abutment ring. The elastic force of the elastic member acts upward on the protrusion.

6. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 5, characterized in that: The elastic member includes a second compression spring placed in the slide groove, the top of the second compression spring abuts against the protrusion, the bottom of the slide groove is screwed with a limiting bolt, and the bottom of the second compression spring abuts against the limiting bolt.

7. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 1, characterized in that: A guide groove is provided on the screw rod along the axial direction, a guide key is slidably fitted in the guide groove, and the guide key is fixedly connected to the dynamic chuck.

8. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 1, characterized in that: The swing mechanism includes two connecting seats and a clutch, the two connecting seats are rotatably connected via a shaft core, and the clutch includes two toothed discs with opposing tooth surfaces and movably sleeved on the shaft core, one of the connecting seats is fixedly connected to the insulating rod and to one of the toothed discs, and the other connecting seat is fixedly connected to the operating rod and slidably connected to the other toothed disc; The movable sleeve on the shaft core is provided with a first compression spring, and the two ends of the first compression spring are respectively in contact with a gear disk. A nut is also threadedly connected to the shaft core. By tightening the nut, the first compression spring can be compressed to store energy and the two gear disks can be engaged with each other.

9. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 1, characterized in that: The fixed clamping head comprises an upper clamping seat connected to the screw rod and an upper clamping block fixedly connected to the upper clamping seat. The bottom of the upper clamping block is provided with a clamping opening and teeth.

10. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 1, characterized in that: The bottom of the operating rod is provided with a terminal electrically connected to the fixed clamp and the movable clamp, and a butterfly nut is screwed on the terminal; The three phases of the transformer are electrically connected respectively through the three wiring devices for short-circuiting the three phases of the transformer. The terminals of the three wiring devices for short-circuiting the three phases of the transformer are short-circuited through short-circuiting wires, and the short-circuiting wires are fixed to the terminals through butterfly nuts.

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