A lead-in device for three-phase short-circuiting of a transformer

Abstract

The present invention discloses a lead-in device for short-circuiting three-phase transformers, and relates to the technical field of lead-in wiring, including an operating rod and a clamping mechanism, wherein the clamping mechanism includes an insulating rod, a screw, a fixed chuck and a movable chuck, the fixed chuck being fixedly mounted on the top of the screw, the movable chuck being slidably sleeved on the screw, the insulating rod being threadedly connected with the screw by 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 by a swing mechanism to adjust the angle of the clamping mechanism. By rotating the operating rod, the movable chuck can be pressed upward against the equalizing ring, so that the movable chuck and the fixed chuck can cooperate to lock the equalizing ring, the connection is firm and stable, and the problems of swinging, slipping, and virtual connection are solved, and the lead-in wiring operation can be carried out on the ground with high safety; and the operating rod and the insulating rod are connected by a swing mechanism to adjust the clamping angle of the clamping mechanism, so that the equalizing ring can be clamped conveniently.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lead-in connection, in particular to a lead-in connection device for three-phase short connection of a transformer. BACKGROUND

[0002] Three-phase common transformer needs to be three-phase short connected during insulation inspection. Since the connection board of the three-phase common transformer is at a high position, the existing lead-in connection methods mainly have two kinds: one is to use a boom truck to lift the operator to the vicinity of the connection board, and then to wind the short connection wire on the equalizing ring (or lead-in wire) of each phase; the other is to hook the high-altitude connection clamp to the equalizing ring of each phase through an operating rod, and the wires of each high-altitude connection clamp are short connected on the ground.

[0003] In the above-mentioned existing lead-in connection methods, the former has firm short connection wire connection and will not cause loose connection, but needs to use large equipment such as a boom truck, and has certain high-altitude operation risk; the latter has higher safety without high-altitude operation of the operator and without large lifting equipment, but the high-altitude connection clamp is usually hooked to the equalizing ring (or lead-in wire) through a spring hook, and there are certain probability of swinging, slipping, loose connection and other hidden troubles. SUMMARY

[0004] The purpose of the present application is to provide a lead-in connection device for three-phase short connection of a transformer to solve the problem that the existing technology is difficult to have both lead-in connection stability and operation safety.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a lead-in connection device for three-phase short connection of a transformer, comprising an operating rod and a clamping mechanism, the clamping mechanism comprising an insulating rod, a screw rod, a fixed chuck and a movable chuck, the fixed chuck being fixedly installed at the top of the screw rod, the movable chuck being slidably sleeved on the screw rod, and the insulating rod being threadedly connected with the screw rod through a screw sleeve to drive the opening and closing of the movable chuck and the fixed chuck; the operating rod and the insulating rod are rotationally connected through a swing mechanism to adjust the angle of the clamping mechanism.

[0006] Further, the top of the insulating rod and the bottom of the movable chuck are rollingly abuttingly matched through a thrust ball bearing.

[0007] Further, an elastic unit is arranged between the screw rod and the movable chuck, the elastic force of the elastic unit acting upward on the movable chuck; the bottom of the movable chuck is rotationally connected with a rotating ring, the bottom of the rotating ring is fixedly connected with a fan ring, the fan ring and the bottom surface of the rotating ring have a spacing and form an annular space, and the fan ring is provided with a rib for dividing the annular space; the screw sleeve is fixedly connected with an abutting ring, the inner wall of the abutting ring is provided with a protrusion, the thickness of the protrusion is less than the height of the annular space, and the protrusion can enter the annular space and abuttingly match with the rib.

[0008] Further, the elastic unit comprises a compression spring arranged in the inner cavity of the screw rod, the top of the compression spring abuts against the movable chuck, and the bottom of the compression spring abuts against the end plug at the bottom of the screw rod.

[0009] Further, a slide groove with only a bottom opening is formed on the inner wall of the abutting ring in the axial direction, the protrusion is in sliding connection with the slide groove, and an elastic member is further arranged on the abutting ring, and the elastic force of the elastic member acts upward on the protrusion.

[0010] Further, the elastic member comprises a second compression spring arranged 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 is in abutting connection with the limiting bolt.

[0011] Further, a guide groove is formed on the screw rod in the axial direction, a guide key is in sliding connection with the guide groove, and the guide key is fixedly connected with the movable chuck.

[0012] Further, the swing mechanism comprises two connecting seats and a clutch, the two connecting seats are rotatably connected through a shaft core, the clutch comprises two toothed discs with opposite tooth surfaces and movably sleeved on the shaft core, one of the connecting seats is fixedly connected with the insulating rod and one of the toothed discs, the other connecting seat is fixedly connected with the operating rod and in sliding connection with the other toothed disc; the shaft core movably sleeved with a first compression spring, the two ends of the first compression spring are in abutting connection with the toothed discs respectively, and a nut is threadedly connected on the shaft core, and the first compression spring is compressed to store energy and the two toothed discs are clamped and connected by tightening the nut.

[0013] Further, the fixed chuck comprises an upper chuck seat connected with the screw rod and an upper chuck block fixedly connected with the upper chuck seat, and the bottom of the upper chuck block has a clamping opening and is provided with a strip tooth.

[0014] Further, the bottom of the operating rod is provided with a terminal post electrically connected with the fixed chuck and the movable chuck, a wing nut is screwed on the terminal post; three lead-in wire devices for three-phase short circuit of the transformer are respectively electrically connected with three phases of the transformer, the terminal posts of the three lead-in wire devices are short-circuited through a short-circuit wire, and the short-circuit wire is fixed on the terminal posts through the wing nut.

[0015] Compared with the prior art, the device for transformer three-phase short-circuiting provided by the application can lift the clamping mechanism to the terminal board of the transformer through the operating rod, hook the fixed jaw to the grading ring (or the lead wire), and then rotate the operating rod to drive the insulating rod to rotate relative to the screw rod, so that the insulating rod and the screw sleeve move upwards along the screw rod, and the movable jaw is tightly pressed upwards to the grading ring, so that the movable jaw and the fixed jaw cooperate to lock the grading ring, and the connection is firm and stable, and the problems of swinging, slipping, loose connection and the like are solved, and the lead connection operation can be performed on the ground, and the safety is high. The operating rod and the insulating rod are connected through the swing mechanism, the angle of the clamping mechanism can be adjusted, and the grading ring can be clamped to avoid obstacles or special terrain. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the drawings used in the embodiments will be briefly introduced as follows.

[0017] Figure 1 The overall structure schematic diagram provided for the embodiments is shown in the figure.

[0018] Figure 2 The structure schematic diagram of the multi-section operating rod butt joint provided for the embodiments is shown in the figure.

[0019] Figure 3 The structure schematic diagram of the swing mechanism provided for the embodiments is shown in the figure.

[0020] Figure 4 The structure schematic diagram of the clamping mechanism when opened provided for the embodiments is shown in the figure.

[0021] Figure 5 The structure top view of the clamping mechanism when opened provided for the embodiments is shown in the figure.

[0022] Figure 6 The structure along the line A-A in the figure is shown in the figure. Figure 5

[0023] The structure of the place B in the figure is shown in the figure. Figure 7 Figure 6 The structure of the place B in the figure is shown in the figure.

[0024] Figure 8 The structure schematic diagram of the convex block bottom surface and the top surface of the sector ring abutting against each other provided for the embodiments is shown in the figure.

[0025] Figure 9 The connection structure schematic diagram of the rotating ring, the sector ring and the rib provided for the embodiments is shown in the figure.

[0026] Figure 10 The connection structure schematic diagram of the abutting ring and the convex block provided for the embodiments is shown in the figure.

[0027] Figure 11 The structure schematic diagram of the clamping mechanism when pre-clamping the lead wire provided for the embodiments is shown in the figure.​

[0028] Figure 12 Structure diagram of the clamping mechanism when locking the lead wire for the embodiment;

[0029] Figure 13 Structure sectional view of the clamping mechanism when closed for the embodiment;

[0030] Figure 14 Structure diagram of the clamping mechanism when locking the lead wire for the embodiment; Figure 13 Structure enlarged view at C in the middle;

[0031] Figure 15 Structure diagram of the protrusion entering the annular space from one side for the embodiment;

[0032] Figure 16 Structure diagram of the protrusion abutting against the side surface of the fan ring for the embodiment;

[0033] Figure 17 Structure diagram of the protrusion abutting against the bottom surface of the fan ring for the embodiment;

[0034] Figure 18 Structure diagram of the protrusion entering the annular space from the other side for the embodiment when disassembled;

[0035] Figure 19 Structure sectional view of the clamping mechanism for another embodiment.

[0036] Explanation of reference numerals:

[0037] 1. Operating rod; 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 stop ring; 35. Fixed chuck; 351. Upper clamping seat; 352. Upper clamping block; 36. Movable chuck; 361. Lower clamping 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. Protrusion; 318. Second compression spring; 319. Limit bolt; 320. Telescopic sleeve; 4. Butterfly nut; 5. Lead wire; 6. Connecting wire. DETAILED DESCRIPTION

[0038] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0039] Please refer to Figures 1-19The embodiment of the present application provides a lead wire device for three-phase short circuit of a transformer, which comprises an operating rod 1 and a clamping mechanism 3, the clamping mechanism 3 comprises an insulating rod 31, a screw rod 33, a fixed chuck 35 and a movable chuck 36, the operating rod 1 is composed of a plurality of rod bodies in butt joint, and is convenient to assemble. The fixed chuck 35 and the movable chuck 36 are mirror arranged, and a telescopic sleeve 320 is arranged between the fixed chuck 35 and the movable chuck 36, the telescopic sleeve 320 can cover the screw rod 33. The fixed chuck 35 comprises an upper clamping seat 351 and an upper clamping block 352, the upper clamping block 352 is fixedly connected to the bottom of the upper clamping seat 351, the bottom of the upper clamping block 352 has a clamping opening and is provided with a strip tooth, the upper clamping seat 351 is fixedly installed on the top of the screw rod 33, and can be welded or detachably clamped, and is limited by the shaft stop ring 34. The movable chuck 36 comprises 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 a strip tooth, the lower clamping seat 361 is slidably sleeved on the screw rod 33 through a through hole on the lower clamping seat 361, a guide groove 38 is formed in the screw rod 33 in the axial direction, a guide key 37 is slidably arranged in the guide groove 38, the guide key 37 is fixedly connected with the lower clamping seat 361 of the movable chuck 36, so that the movable chuck 36 can only move in the axial direction of the screw rod 33, but cannot rotate in the circumferential direction of the screw rod 33. The top of the insulating rod 31 is fixedly connected with a coaxial screw sleeve 32, the screw sleeve 32 has an internal thread and is threadedly connected with the screw rod 33, the top of the insulating rod 31 or the screw sleeve 32 is in abutting connection with the bottom of the movable chuck 36, as shown in FIG. 1, and a thrust ball bearing 39 arranged between the insulating rod 31 and the screw sleeve 32 can reduce abrasion. In addition, the insulating rod 31 and the operating rod 1 are rotationally connected through the swing mechanism 2, and the rotation angle is usually designed to be within 45°. Figure 19

[0040] ​When the transformer is connected, the clamping mechanism 3 is lifted to the terminal board of the transformer through the operating rod 1, the fixed clamp head 35 is hooked to the grading ring, the resistance between the fixed clamp head 35 and the grading ring is limited to prevent the fixed clamp head 35 from rotating (the fixed clamp head 35 is pressed downward by the gravity of the device), then the operating rod 1 is rotated to drive the insulating rod 31 to rotate relative to the screw sleeve 32 and the screw rod 33, so that the insulating rod 31 and the screw sleeve 32 move upward along the screw rod 33, the screw sleeve 32 abuts against the movable clamp head 36 and drives the movable clamp head 36 to slide upward along the screw rod 33, the movable clamp head 36 is abutted upward to the grading ring, that is, the movable clamp head 36 and the fixed clamp head 35 are locked to the grading ring, the connection is firm and stable, the problems such as swinging, slipping and loose connection are solved, the connection operation can be performed on the ground, and the safety is high. It should be noted that when the angle between the clamping mechanism 3 and the operating rod 1 is large, the axis of rotation of the operating rod 1 and the insulating rod 31 is not vertical and is always changing, the fixed clamp head 35 shakes seriously when the operating rod 1 is rotated, in addition to the gravity of the device to press the fixed clamp head 35 downward, a downward pulling force can be applied to the operating rod 1 to increase the friction between the fixed clamp head 35 and the grading ring, so that the fixed clamp head 35 does not separate from the grading ring and rotates with the operating rod 1, and the phenomenon that the clamping mechanism 3 cannot clamp the grading ring occurs.

[0041] The swing mechanism 2 comprises two connecting seats 21 and a clutch. One connecting seat 21 is fixedly connected with the bottom of the insulating rod 31, and the other connecting seat 21 is fixedly connected with the top of the operating rod 1. The two connecting seats 21 are rotationally connected through the shaft core 22, so that the clamping mechanism 3 can swing relative to the operating rod 1, thereby adjusting the angle of the clamping mechanism 3, and conveniently avoiding obstacles or special terrain to clamp the equalizing ring. The clutch is used to realize the rotation and locking between the two connecting seats 21. The clutch comprises two toothed discs 23 movably sleeved on the shaft core 22. The tooth surfaces of the two toothed discs 23 are opposite to each other. One toothed disc 23 is fixedly connected with one connecting seat 21 (which can be the connecting seat 21 connected with the insulating rod 31 or the connecting seat 21 connected with the operating rod 1), and the other toothed disc 23 is slidingly connected with the other connecting seat 21 along the axial direction of the shaft core 22. The shaft core 22 movably sleeved with a first compression spring 24. The two ends of the first compression spring 24 are respectively in abutting engagement with one toothed disc 23. Therefore, in the released state of the second spring force, the two toothed discs 23 can be separated, so that the two connecting seats 21 can rotate relative to each other. The shaft core 22 is also threadedly connected with a nut 25. By tightening the nut 25, on the one hand, one connecting seat 21 can slide along the shaft core 22, so that the two toothed discs 23 are clamped and engaged, and on the other hand, the first compression spring 24 can be compressed and stored energy. Therefore, after the two toothed discs 23 are clamped together, the two connecting seats 21 cannot rotate relative to each other, thereby realizing the locking between the two connecting seats 21, i.e. the angle of the clamping mechanism 3 relative to the operating rod 1 is locked. When it is necessary to adjust the angle of the clamping mechanism 3 again, the nut 25 can be loosened for adjustment.

[0042] The operating rod 1 and the insulating rod 31 are both hollow and provided with wires. The wires pass through the inside of the screw rod 33 and are respectively connected with the upper clamping block 352 and the lower clamping block 362. The wires are spirally wound in the insulating rod 31 for multiple turns, and will not be damaged when the operating rod 1 and the insulating rod 31 rotate relative to the screw rod 33, the movable clamp head 36 and the fixed clamp head 35. Figure 2 The wires 5 at the joint of the multiple sections of the operating rod 1 are connected through plug-in connection, so that the wires 5 between the adjacent two sections of the operating rod 1 are electrically connected. Figure 3 The insulating rod 31 and the operating rod 1 are respectively provided with a jack connected with the respective wires. A connecting wire 6 with plugs at both ends is provided. One end of the connecting wire 6 is inserted into the jack on the insulating rod 31, and the other end is inserted into the jack on the operating rod 1, so that the wires in the insulating rod 31 and the wires in the operating rod 1 are electrically connected. The bottom section of the operating rod 1 is provided with a terminal post electrically connected with the wires. The terminal post is threadedly connected with a wing nut 4. When three lead wire devices are respectively connected with three phases of the transformer, the terminal posts of the lead wire devices are connected through a short circuit wire. The end of the short circuit wire is wound on the terminal post. The short circuit wire can be fixed by tightening the wing nut 4, so that the three lead wire devices are kept short-circuited.

[0043] In another embodiment of the present application, a resilient unit is arranged between the screw 33 and the movable chuck 36, and the elastic force of the resilient unit acts upward on the movable chuck 36. The resilient unit is preferably a compression spring 310. In addition to the guide groove 38, the screw 33 is provided with an inner cavity extending through the bottom of the screw 33 and the guide groove 38. The compression spring 310 is arranged in the inner cavity and the guide groove 38. The top of the compression spring 310 abuts against the movable chuck 36, and the bottom of the compression spring 310 abuts against an end plug 311 at the bottom of the screw 33. In order to prevent the compression spring 310 from bending and inelastic deformation, a telescopic rod is arranged in the compression spring 310 to maintain the posture of the compression spring 310. The telescopic rod has two ends connected to the bottom of the screw 33 and the top of the guide groove 38, respectively.

[0044] The bottom of the movable chuck 36 is rotationally connected with a rotating ring 312. The bottom of the rotating ring 312 is fixedly connected with a fan ring 313. The fan ring 313 has a spacing from the bottom surface of the rotating ring 312 and forms 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 a rib 314 for dividing the annular space, i.e., the rib 314 divides the annular space into two parts (as shown in Figure 9 For the sake of distinction and convenient description, one part is referred to as a first space (the space on the right of the rib 314 in Figure 8 , Figures 15-18 ), and the other part is referred to as a second space (the space on the left of the rib 314 in Figure 8 , Figures 15-18 ). The insulating rod 31 or the screw sleeve 32 is coaxially fixedly connected with an abutting ring 315. The diameter of the abutting ring 315 is adapted to the diameter of the rotating ring 312, but is greater than the diameter of the fan ring 313. The inner wall of the abutting ring 315 is elastically slidably connected with a protrusion 317 in 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 fan ring 313 should be less than the friction between the rotating ring 312 and the movable chuck 36. The bottom of the protrusion 317 can be provided with a ball to form rolling friction, so as to reduce the friction between the protrusion 317 and the upper surface of the fan ring 313.

[0045] For the specific connection mode between the protrusion 317 and the abutting ring 315, refer to Figure 10The inner wall of the abutting ring 315 is provided with a sliding groove 316 in the axial direction, the sliding groove 316 is only open at the bottom and closed at the top, the protruding block 317 is provided with a sliding block matched with the sliding groove 316, the protruding block 317 is slidably connected with the sliding groove 316 through the sliding block, and the abutting ring 315 is further provided with an elastic member, the elastic force of the elastic member acts upward on the protruding block 317. The elastic member is specifically a second compression spring 318, the second compression spring 318 is arranged in the sliding groove 316, the top of the second compression spring 318 abuts against the bottom of the sliding block, the bottom of the sliding groove 316 is screwed with a limiting bolt 319, and the bottom of the second compression spring 318 abuts against the limiting bolt 319.

[0046] In the embodiment, after the fixed chuck 35 is hooked to the equalizing ring, a small amount of rotation of the operating rod 1 can make the movable chuck 36 move upward to preliminarily clamp the equalizing ring, then the operating rod 1 is continuously rotated to make the sleeve 32 tightly abut against the movable chuck 36, so that the movable chuck 36 and the fixed chuck 35 firmly clamp the equalizing ring, thereby the downward pulling force does not need to be applied to the operating rod 1 to maintain the stability of the fixed chuck 35 in the process of rotating the operating rod 1, and it is not necessary to continuously pay attention to whether the fixed chuck 35 rotates relative to the equalizing ring, so that the operating rod 1 is convenient to rotate, especially in the case that the angle between the clamping mechanism 3 and the operating rod 1 is large, the action of rotating the operating rod 1 is more convenient to perform. Moreover, the fixed chuck 35 will not repeatedly rub against the equalizing ring to damage the equalizing ring in the process of rotating the operating rod 1.

[0047] Before the clamping mechanism 3 clamps the equalizing ring, referring to Figures 4-7 , the movable chuck 36 and the fixed chuck 35 need to be kept in a separated state, the protruding block 317 on the abutting ring 315 is located in the second space of the annular space (as shown in Figure 8 ), and the compression spring 310 is in a compressed energy storage state with a large deformation variable. After the fixed chuck 35 is hooked to the equalizing ring, the operating rod 1 is counterclockwise (relative to Figures 6-8 ) rotated slightly to drive the sleeve 32 and the abutting ring 315 to rotate, so that the protruding block 317 is turned out of the second space, when the protruding block 317 no longer blocks the fan ring 313, the elastic potential energy of the compression spring 310 is released to drive the movable chuck 36 and the rotating ring 312 to move upward along the screw rod 33 until the movable chuck 36 abuts against the equalizing ring (as shown in Figure 11 ), and the compression spring 310 is still in a compressed deformation state in this state, and has a large upward force on the movable chuck 36, the movable chuck 36 presses the equalizing ring upward, and the movable chuck 36 and the fixed chuck 35 cooperate to preliminarily clamp the equalizing ring, as shown in Figures 12-14 .

[0048] Then continue to rotate the operating rod 1 counterclockwise, due to the pre-clamping of the movable clamp head 36 and the fixed clamp head 35 to the equalizing ring, the movable clamp head 36 and the fixed clamp head 35 are difficult to separate from the equalizing ring, so that the fixed clamp head 35, the movable clamp head 36 and the screw rod 33 will not rotate, when the rotating operating rod 1 passes through the screw sleeve 32 and the screw rod 33 threadedly matched to make the abutting ring 315 rise to the vicinity of the movable clamp head 36, the convex block 317 and the fan ring 313 may have three docking situations: the first situation is that the convex block 317 directly rotates into the second space (as shown in Figure 15 ), and then the side surface of the convex block 317 abuts against the rib 314, the convex block 317 rotates the rotating ring 312 together through the rib 314 while the convex block 317 moves upward relative to the rib 314, until the abutting ring 315 abuts against the rotating ring 312, so that the movable clamp head 36 and the fixed clamp head 35 firmly clamp the equalizing ring; the second situation is that the side surface of the convex block 317 abuts against the side surface of the fan ring 313 (as shown in Figure 16 ), and then the convex block 317 rotates the rotating ring 312 together through the fan ring 313 while the convex block 317 moves upward relative to the fan ring 313, until the bottom of the convex block 317 is higher than the top of the fan ring 313, the convex block 317 enters the second space and abuts against the rib 314, and then continues to rotate the rotating ring 312 through the rib 314, until the abutting ring 315 abuts against the rotating ring 312, so that the movable clamp head 36 and the fixed clamp head 35 firmly clamp the equalizing ring; the third situation is that the convex block 317 rotates below the fan ring 313 and moves upward to abut against the bottom of the fan ring 313 in the following rotation process (as shown in Figure 17 ), since the abutting ring 315 will continue to rotate and the convex block 317 will also be lifted in height, and the rotating ring 312 and the fan ring 313 cannot move upward any more, in order to offset this interference, when the abutting ring 315 continues to rotate and rises, the convex block 317 will not rise in height under the limitation of the fan ring 313, but will slide relative to the abutting ring 315 against the elastic force of the second spring, until the convex block 317 is completely rotated away from the fan ring 313, the elastic force of the second spring is released to make the convex block 317 move upward relative to the ring and reset, and then when the convex block 317 rotates to the vicinity of the fan ring 313 in the next round, it will face the second situation or the first situation, and finally the abutting ring 315 will abut against the rotating ring 312, so that the movable clamp head 36 and the fixed clamp head 35 firmly clamp the equalizing ring.

[0049] When it is needed to take the lead wire device off the equalizing ring, first rotate the operating rod 1 clockwise, so that the convex block 317 rotates from the second space to the first space while descending (as shown in Figure 18), the convex block 317 will abut against the rib 314 after entering the first space, drive the rotating ring 312 to rotate clockwise, the convex block 317 will slide downward relative to the rib 314, until the ground of the convex block 317 abuts against the top surface of the fan ring 313, then the convex block 317 drives the fan ring 313 to rotate and descend, the fan ring 313 drives the movable chuck 36 to descend through the rotating ring 312, until the movable chuck 36 completely separates from the fixed chuck 35, releases the equalizing ring, and the descent of the movable chuck 36 further compresses the compression spring 310, so that the compression spring 310 stores energy. At this step, the clamping mechanism 3 returns to the state before clamping the equalizing ring, and can be cycled.

[0050] The above describes certain exemplary embodiments of the present application and should not be construed as limiting the scope of the claims of the present application. Those skilled in the art can modify the described embodiments in other different ways without departing from the spirit and scope of the present application.

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; 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. The screw sleeve is fixedly connected to an abutment ring, 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, and the protrusion can enter the annular space and abut against the rib; 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: 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.

4. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 1, 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.

5. The lead-in connection device for three-phase short-circuiting of a transformer according to claim 4, 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.

6. 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.

7. 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.

8. 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.

9. 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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