General short-circuit current-carrying device for box-type transformer substation test

Abstract

The invention discloses a general short-circuit current-carrying device for a box-type transformer test, and the device comprises a clamp part which comprises a clamp connection supporting part, a clamp quick-release part, and a clamp pre-tightening part, and the clamp quick-release part and the clamp pre-tightening part are connected to the clamp connection supporting part; the short-circuit communication piece is clamped by the connected clamp piece and electrically connected to the transformer, the short-circuit communication piece comprises a short-circuit connecting frame and a short-circuit connecting plate, and the short-circuit connecting plate is arranged on the short-circuit connecting frame, clamped by the clamp quick-release piece and the clamp pre-tightening piece and connected to a low-voltage winding terminal of the transformer. The plurality of low-voltage winding terminals are electrically connected. The device is simple and efficient in operation, safe and reliable in test process, high in dismounting and mounting efficiency and stable and reliable in electric connection.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power detection, and more specifically to a universal short-circuit current-carrying device for testing a box-type transformer. Background Art

[0002] In the operation of the power grid, the box-type substation is a major power supply equipment, and the box-type transformer is the core of the box-type substation. In order to ensure the safety of the power grid and equipment, the safety performance of the box-type transformer needs to be tested before it leaves the factory, among which the load loss test and temperature rise test are important test items. According to the national standard "High-voltage / Low-voltage Prefabricated Substation" (GB / T 17467), the load loss test of the box-type transformer and the temperature rise test of the box-type transformer (simulated load method) need to be measured with one side of the winding passing the rated current and one side of the winding short-circuited, that is, both tests require short-circuit connection.

[0003] During the load loss test and temperature rise test, the short-circuit current on the low-voltage side of the box-type transformer is relatively large. In order to ensure the reduction of contact resistance and heat generation, the short-circuit current-carrying device is required to have a firm contact and a large enough contact area. Generally, the current-carrying TMY copper busbar is clamped and connected to the low-voltage winding terminal of the box-type transformer with pliers. One terminal usually requires three to four pliers to ensure a tight connection and firm contact. The box-type transformer usually has three low-voltage winding terminals (the low-voltage winding terminals are tinned copper busbars), which are arranged in rows. Often, the three terminals are not arranged on the same horizontal plane, and the angles are not aligned, making it difficult to ensure that each low-voltage winding terminal is in close contact with the current-carrying TMY copper busbar. In addition, the current-carrying TMY copper busbar itself is heavy. When it is clamped and disassembled with pliers, it often requires two to three people to work together, which is time-consuming and labor-intensive and poses safety risks. Especially after the temperature rise test, the temperature of the current-carrying TMY copper busbar and the copper busbar of the low-voltage winding terminal of the box-type transformer increases, and quick disassembly is required, which places very high demands on the proficiency and speed of the test personnel, increasing the safety risks and causing problems such as loose connection, unreliable fixation and heating of the copper busbar. Summary of the invention

[0004] In order to overcome the above defects, the present invention provides a universal short-circuit current-carrying device for box-type transformer testing, which specifically adopts the following technical solutions:

[0005] A universal short-circuit current-carrying device for testing a box-type transformer, comprising:

[0006] A clamp member, the clamp member comprising a clamp connection support member, a clamp quick release member and a clamp pre-tightening member, the clamp quick release member and the clamp pre-tightening member are both connected to the clamp connection support member;

[0007] A short-circuit connecting piece is clamped and electrically connected to the transformer by the connected clamp piece. The short-circuit connecting piece includes a short-circuit connecting frame and a short-circuit connecting plate. The short-circuit connecting plate is on the short-circuit connecting frame and is clamped and connected to the low-voltage winding terminal of the transformer by the clamp quick-release piece and the clamp pre-tightening piece to electrically connect multiple low-voltage winding terminals.

[0008] Preferably, the clamp connection support member includes a clamp connection support frame, and the clamp connection support frame can be sleeved outside the low-voltage winding terminal of the transformer; multiple clamp connection support frames correspond to multiple low-voltage winding terminals one by one; the clamp quick-release part includes a single quick-release part and a unified quick-release part, the single quick-release part is arranged on the clamp connection support frame, and the unified quick-release part is arranged on the single quick-release part.

[0009] Preferably, the single quick-release component includes a quick-release transmission shaft, a quick-release pressure pad, a first spring and a quick-release handle, one end of the quick-release transmission shaft slides through a groove wall of the clamp connection support frame, the quick-release pressure pad is arranged on one end of the quick-release transmission shaft and moves with it, the first spring is sleeved outside one end of the quick-release transmission shaft, one end of the quick-release handle is hinged to the other end of the quick-release transmission shaft, and the hinge point between the quick-release handle and the quick-release transmission shaft is located at a non-center point of one end of the quick-release handle; multiple sets of the single quick-release components correspond one by one to multiple clamp connection support frames.

[0010] Preferably, the unified quick-release part includes a quick-release transmission plate, the quick-release transmission plate is provided with a quick-release through-hole, the quick-release through-hole is sleeved outside the quick-release handle, and the inner wall of one end of the quick-release through-hole is provided with a rotating shaft, and the rotating shaft rotates through the rotating hole on the other end of the quick-release handle; the multiple quick-release through-holes correspond one by one to the multiple sets of single quick-release parts.

[0011] Preferably, the clamp preload member comprises a single preload transmission member and a unified preload transmission member, and both the single preload transmission member and the unified preload transmission member are arranged on the clamp connection support frame.

[0012] Preferably, the single pre-tightening transmission member comprises an axial pre-tightening transmission member and a circumferential transmission member, and both the axial pre-tightening transmission member and the circumferential transmission member are arranged on the clamp connection support frame.

[0013] Preferably, the axial preload transmission member comprises a screw and a preload washer, one end of the screw is rotatably embedded in a threaded hole on another groove wall of the clamp connection support frame, and the preload washer is rotatably arranged on one end face of the screw.

[0014] Preferably, the circumferential transmission member includes a circumferential transmission tongue, a second spring and a circumferential transmission tube, one end of the circumferential transmission tongue is provided with a slope, the other end of the circumferential transmission tongue is slidably embedded in the transmission groove on the side wall of the other end of the screw, the second spring is embedded in the bottom of the transmission groove, one end of the circumferential transmission tube is sleeved on the other end of the screw and then rotatably arranged on the other groove wall of the clamp connecting support frame; the ratchet teeth on the inner wall of the circumferential transmission tube cooperate with one end of the circumferential transmission tongue; multiple sets of the single preloaded transmission members correspond one by one to multiple low-voltage winding terminals.

[0015] Preferably, the unified pre-tightening transmission member includes a transmission rod, a worm gear and a rotating handle, the transmission rod is rotatably arranged on the mounting seat of the clamp connecting support frame, the worm gear is sleeved on the transmission rod, and the worm gear is meshed with the gear teeth on the outer wall of the circumferential transmission tube; the multiple worm gears correspond one by one to the multiple sets of the unidirectional pre-tightening transmission members to transmit to the multiple sets of the unidirectional pre-tightening transmission members, and the rotating handle is arranged on the free end of the transmission rod.

[0016] Preferably, the short-circuit connection plate includes a hard connection plate and a soft connection plate, the hard connection plate is vertically fastened to the short-circuit connection frame, and one end of the hard connection plate is used to be tightly pressed and electrically connected to the low-voltage winding terminal at the middle position by the pre-tightening pad; one end of the soft connection plate is electrically connected to the short-circuit connection frame, and the other end of the soft connection plate is used to be tightly pressed and electrically connected to the low-voltage winding terminal at the end position by the pre-tightening pad; the two soft connection plates are correspondingly connected to the two ends of the short-circuit connection frame, and the two soft connection plates are respectively connected to the two low-voltage winding terminals at the two end positions one by one; by adjusting the vertical position of the hard connection plate on the short-circuit connection frame, and adjusting the distance and angle of the soft connection plates at both ends of the short-circuit connection frame, the test requirements of low-voltage winding terminals with different spacings of different models of transformers can be met.

[0017] The present invention has at least the following beneficial effects:

[0018] 1) The universal short-circuit current-carrying device for testing box-type transformers of the present invention is easy and efficient to operate, has a safe and reliable testing process, high efficiency in disassembly and installation, and stable and reliable electrical connection;

[0019] 2) The universal short-circuit current-carrying device for testing the box-type transformer of the present invention is provided with a single quick-release part and a unified quick-release part. A plurality of the single quick-release parts are pressed and fitted with a plurality of the low-voltage winding terminals one by one, and the unified quick-release part is connected with a plurality of the single quick-release parts at the same time. During disassembly, the staff only needs to pull one of the unified quick-release parts to simultaneously drive a plurality of the single quick-release parts to move, so as to simultaneously complete the disassembly operation of the plurality of the low-voltage winding terminals, which significantly improves the ease of operation and disassembly efficiency, prevents the test personnel from contacting the short-circuit connecting parts and the low-voltage winding terminals after heating, and reduces the risk of scalding.

[0020] 3) The universal short-circuit current-carrying device for testing the box-type transformer of the present invention can reduce the contact resistance and reduce the beneficial effect of Joule heat; according to the metal conductivity mechanism, as the temperature rises, the metal lattice vibration is enhanced, which interferes with the movement of free electrons, reduces the conductivity, and the current-carrying capacity becomes smaller accordingly; when the low-voltage winding terminals of the dry-type transformer sample are not arranged in a uniform manner, the use of TMR copper busbars for connection can adjust the contact angle and increase the contact area, which is helpful to improve the heat dissipation performance of the copper busbar and the current-carrying capacity of the copper busbar, and the heat dissipation effect and current-carrying capacity of the copper busbar when placed vertically are improved compared with those when placed horizontally.

[0021] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of the universal short-circuit current-carrying device for testing a box-type transformer of the present invention;

[0023] Figure 2 This is a rear end front view of the universal short-circuit current-carrying device for testing a box-type transformer of the present invention;

[0024] Figure 3 This is a side front view of the universal short-circuit current-carrying device for testing a box-type transformer of the present invention;

[0025] Figure 4 It is a schematic diagram of the front-end three-dimensional structure of the universal short-circuit current-carrying device for testing box-type transformers of the present invention;

[0026] Figure 5 It is a schematic diagram of the rear-end three-dimensional structure of the universal short-circuit current-carrying device for testing box-type transformers of the present invention;

[0027] Figure 6 A general short-circuit current-carrying device for testing a box-type transformer according to the present invention Figure 5 A partial enlarged view of B in the middle;

[0028] Figure 7 A general short-circuit current-carrying device for testing a box-type transformer according to the present invention Figure 1Schematic diagram of the three-dimensional structure of the cross section in the AA direction;

[0029] Figure 8 A general short-circuit current-carrying device for testing a box-type transformer according to the present invention Figure 7 A partial enlarged view of middle C;

[0030] Fig. 9 A general short-circuit current-carrying device for testing a box-type transformer according to the present invention Figure 3 The main view of the section in the FF direction;

[0031] Fig.10 A general short-circuit current-carrying device for testing a box-type transformer according to the present invention Fig. 9 A partial enlarged view of D in the middle;

[0032] Fig.11 A general short-circuit current-carrying device for testing a box-type transformer according to the present invention Figure 3 Schematic diagram of the three-dimensional structure in the cross section along the FF direction;

[0033] Fig.12 A general short-circuit current-carrying device for testing a box-type transformer according to the present invention Fig.11 A partial enlarged view of middle E;

[0034] Fig.13 The present invention is a schematic diagram of the connection method of the short-circuit connecting plate and the low-voltage winding terminal in the universal short-circuit current-carrying device for testing the box-type transformer.

[0035] Among them: 1-transformer, 2-low-voltage winding terminal, 3-clamp connection support frame, 4-quick-release transmission shaft, 5-quick-release pressure pad, 6-first spring, 7-quick-release handle, 8-quick-release transmission plate, 9-rotating shaft, 10-screw, 11-pre-tightening pad, 12-circumferential transmission tongue, 13-second spring, 14-circumferential transmission tube, 15-transmission rod, 16-worm, 17-rotating handle, 18-mounting seat, 19-short-circuit connecting frame, 20-hard connecting plate, 21-soft connecting plate. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described in detail below by way of embodiments with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0037] according to Figure 1-Figure 12 As shown, a universal short-circuit current-carrying device for testing a box-type transformer includes a clamp and a short-circuit connecting piece, wherein the clamp clamps and electrically connects the connected short-circuit connecting piece to the transformer 1. The clamp includes a clamp connection support, a clamp quick release piece, and a clamp pre-tightening piece, wherein the clamp quick release piece and the clamp pre-tightening piece are both connected to the clamp connection support.

[0038] The clamp connection support member includes a clamp connection support frame 3, the clamp connection support frame 3 is in a U-shaped groove shape, and the clamp connection support frame 3 can be sleeved outside the low-voltage winding terminal 2 of the transformer 1. Further, three clamp connection support frames 3 are provided, and the three clamp connection support frames 3 correspond to the three low-voltage winding terminals 2 one by one. It should be noted that the low-voltage winding terminal 2 is used to output current from the transformer 1.

[0039] The clamp quick-release parts include a single quick-release part and a unified quick-release part. The single quick-release part is arranged on the clamp connection support frame 3, and the unified quick-release part is arranged on the single quick-release part. The single quick-release part includes a quick-release transmission shaft 4, a quick-release pressing pad 5, a first spring 6 and a quick-release handle 7. One end of the quick-release transmission shaft 4 axially slides through a groove wall of the clamp connection support frame 3, and the quick-release pressing pad 5 is fixedly arranged on one end of the quick-release transmission shaft 4 to move so as to be pushed and pressed on one side of the low-voltage winding terminal 2. The first spring 6 is sleeved outside one end of the quick-release transmission shaft 4, and one end of the first spring 6 is connected to the quick-release pressing pad 5, and the other end of the first spring 6 is connected to a groove wall of the clamp connection support frame 3. One end of the quick-release handle 7 is in the shape of an arc plate, and one end of the quick-release handle 7 is hinged to the other end of the quick-release transmission shaft 4. The hinge between the quick-release handle 7 and the quick-release transmission shaft 4 is located at a non-center position of one end of the quick-release handle 7, so that when one end of the quick-release handle 7 rotates around the hinge, it rotates in an eccentric circle, thereby pulling out the quick-release transmission shaft 4, so as to drive the quick-release pressing pad 5 to quickly disengage from the low-voltage winding terminal 2, thereby completing the quick-release operation.

[0040] Furthermore, three sets of the single quick-release parts are provided, and the three sets of the single quick-release parts correspond to the three clamp connection support frames 3 one by one.

[0041] The unified quick-release part includes a quick-release transmission plate 8, which is in the shape of a long strip. The quick-release transmission plate 8 is provided with a quick-release through hole, which is in the shape of a long strip. The length of the quick-release through hole is greater than the length of the quick-release handle 7, and the width of the quick-release through hole is greater than the thickness of the quick-release handle 7, so that the quick-release through hole can be completely sleeved outside the quick-release handle 7. A rotating shaft 9 is provided on the inner wall of one end of the quick-insertion through hole, and the rotating shaft 9 rotates through the rotating hole on the other end of the quick-release handle 7. When the quick-release transmission plate 8 moves outward, the other end of the quick-release handle 7 is driven to rotate forwardly through the rotating shaft 9, and then the one end of the quick-release handle 7 is driven to rotate forwardly around the hinge. At this time, the quick-release pressing pad 5 is driven to be pulled outwardly through the quick-release transmission shaft 4 to complete the quick-release operation. When the quick-release transmission plate 8 moves inward, the other end of the quick-release handle 7 is driven to rotate in the opposite direction through the rotating shaft 9, thereby driving one end of the quick-release handle 7 to rotate in the opposite direction around the hinge. At this time, the quick-release pressing pad 5 is pushed inward by the first spring 6 to press against one side of the low-voltage winding terminal 2 to meet the requirements of quick installation. It should be noted that a first heat-insulating sleeve is mounted on the quick-release transmission plate 8 for easy use by the staff.

[0042] Furthermore, there are three quick-release through holes, which correspond to the three sets of single quick-release parts one by one, and the three quick-release through holes are rotatably connected to the three quick-release handles 7 one by one, so as to simultaneously meet the quick-release operation of the three low-voltage winding terminals 2, further improving the quick-release efficiency.

[0043] The clamp preload member includes a single preload transmission member and a unified preload transmission member, both of which are arranged on the clamp connection support frame 3. The single preload transmission member includes an axial preload transmission member and a circumferential transmission member, both of which are arranged on the clamp connection support frame 3.

[0044] The axial preload transmission member includes a screw 10 and a preload washer 11. One end of the screw 10 is rotatably embedded in a threaded hole on another groove wall of the clamp connection support frame 3. When the screw 10 rotates in the threaded hole, it moves axially. The preload washer 11 is rotatably arranged on one end surface of the screw 10 to tightly press and electrically connect the short-circuit connection member to the low-voltage winding terminal 2.

[0045] The circumferential transmission member includes a circumferential transmission tongue 12, a second spring 13 and a circumferential transmission tube 14. The circumferential transmission tongue 12 is in a rectangular block shape. One end of the circumferential transmission tongue 12 is provided with an inclined surface. The other end of the circumferential transmission tongue 12 is slidably embedded in the transmission groove on the side wall of the other end of the screw rod 10. The transmission groove is in a rectangular groove shape. The depth of the transmission groove is less than the diameter of the screw rod 10, and the axis of the transmission groove coincides with the axis of the screw rod 10. The second spring 13 is embedded in the bottom of the transmission groove, and the two ends of the second spring 13 are respectively connected to the other end surface of the circumferential transmission tongue 12 and the bottom of the transmission groove to push the circumferential transmission tongue 12 to move axially in the transmission groove. One end of the circumferential transmission tube 14 is sleeved on the other end of the screw rod 10 and then rotated to be set on the other groove wall of the clamp connection support frame 3. The inner wall of the circumferential transmission tube 14 is circumferentially provided with ratchet teeth, and the ratchet teeth can cooperate with one end of the circumferential transmission tongue 12. It should be noted that, by controlling the elastic force of the second spring 13, the ratchet teeth are adjusted to drive the rotation force of the screw 10 through the circumferential transmission tongue 12, thereby adjusting the thrust value of the pre-tightening pad 11. When the circumferential transmission tube 14 rotates forward, the screw 10 will be driven to rotate forward through the circumferential transmission tongue 12, thereby driving the pre-tightening pad 11 to move inward, so as to tightly press the short-circuit connector to be electrically connected to the low-voltage winding terminal 2; when the pressure of the short-circuit connector pressed on the low-voltage winding terminal 2 reaches a predetermined pressure, due to the inclined surface and the ratchet tooth inclined surface, the rotating circumferential transmission tube 14 will press the circumferential transmission tongue 12 into the transmission groove through the ratchet teeth and the inclined surface, so as to realize the relative rotation of the circumferential transmission tube 14 on the screw 10. This satisfies the non-simultaneous pre-tightening requirements of the three sets of the single pre-tightening parts for the three low-voltage winding terminals 2.

[0046] Furthermore, three sets of the single preload transmission parts are provided, and the three sets of the single preload transmission parts correspond to the three low-voltage winding terminals 2 one by one. It should be noted that the three low-voltage winding terminals 2 on the transformer 1 are often not on the same plane, so the number of turns of the screw 10 required is different.

[0047] As an option, a circumferentially rotating tube is fixedly arranged on another groove wall of the clamp connection support frame 3, the inner diameter of the circumferentially rotating tube is larger than the diameter of the screw 10, and the axis of the circumferentially rotating tube coincides with the axis of the screw 10. One end of the circumferential transmission tube 14 is rotatably sleeved on the circumferentially rotating tube, so that the circumferential transmission tube 14 is circumferentially rotated and axially locked on the circumferentially rotating tube.

[0048] The unified pre-tightening transmission member includes a transmission rod 15, a worm 16 and a rotating handle 17. The transmission rod 15 is rotatably arranged on the mounting seat 18 of the clamp connection support frame 3. The worm 16 is axially slidably sleeved on the transmission rod 15, and the slider on the inner wall of the worm cooperates with the slide groove on the transmission rod, so that the worm 16 slides axially on the transmission rod and is relatively locked circumferentially. The worm 16 is meshed with the gear teeth on the outer wall of the circumferential transmission tube 14. Further, three worms 16 are provided, and the three worms 16 correspond to the three sets of the one-way pre-tightening transmission members one by one to transmit to the three sets of the one-way pre-tightening transmission members. The rotating handle 17 is arranged on one end of the transmission rod 15 to facilitate personnel to rotate the transmission rod 15. It should be noted that a second heat insulation sleeve is sleeved on the rotating handle 17 to facilitate personnel operation.

[0049] Furthermore, the other end of the transmission rod 15 is circumferentially rotatable and axially locked on one of the mounting seats 18, and one end of the transmission rod 15 slides through the other mounting seat 18, so that the transmission rod 15 slides axially and rotates circumferentially on the other mounting seat 18; the two mounting seats are respectively arranged on the clamp connection support frame 3 at both ends to meet the requirements of the clamp connection support frames 3 at both ends to be adjusted away from or close to each other.

[0050] The short-circuit connecting piece includes a short-circuit connecting frame 19 and a short-circuit connecting plate, and the short-circuit connecting plate is arranged on the short-circuit connecting frame 19. The short-circuit connecting frame 19 is in the shape of a plate. As an option, the short-circuit connecting frame 19 is a TMY copper bar (TMY copper bar is a hard copper bar). The short-circuit connecting plate includes a hard connecting plate 20 and a soft connecting plate 21. The hard connecting plate 20 is in the shape of a plate, and the hard connecting plate 20 is vertically fastened to the short-circuit connecting frame 19 by a first bolt. Further, one end of the hard connecting plate 20 is used to be tightly pressed and electrically connected to the other side of the low-voltage winding terminal 2 (B phase connector) in the middle position by the pre-tightening pad 11. As an option, the hard connecting plate 20 is a TMY copper bar (TMY copper bar is a hard copper bar). One end of the soft connecting plate 21 is electrically connected to the short-circuit connecting frame 19 after passing through the connecting through hole on the short-circuit connecting frame 19 by a second bolt. The other end of the soft connection plate 21 is used to be tightly pressed and electrically connected to the low-voltage winding terminal 2 (A phase or C phase connector) at the end position by the pre-tightening pad 11. Furthermore, two soft connection plates 21 are provided, and the two soft connection plates 21 are correspondingly connected to the two ends of the short-circuit connection frame 19, so that the two soft connection plates 21 are respectively connected to the two low-voltage winding terminals 2 at the two end positions one by one. As an option, the soft connection plate 21 is a TMR copper busbar (TMR copper busbar is a soft copper busbar). It should be noted that the middle vertical copper busbar (hard copper busbar) can be adjusted in height through the first bolt hole, and the vertical soft copper busbars on both sides can be moved and rotated by adjusting the second bolt to match the low-voltage winding terminals with different spacings and arranged at different angles, so as to achieve a quick, effective and tight connection. The specific connection method is as follows:

[0051] 1) When the sample is a large dry transformer and the spacing between the low-voltage winding terminals is large and greater than the length of the connecting through-hole, the hard connecting plate 20 is lowered to the lowest position, and the soft connecting plates 21 at both ends are pulled to the outermost side and rotated outward to expand the connection distance to match the low-voltage winding terminals with large spacing.

[0052] 2) When the sample is a small dry transformer and the spacing between the low-voltage winding terminals is small and less than the length of the connecting through-hole, the hard connecting plate 20 is raised to the highest position, and the soft connecting plates 21 at both ends are pulled to the innermost side and rotated inward to shorten the connection distance and match the small-pitch low-voltage winding terminals.

[0053] The above two connection methods are shown in the following figure: Fig.13 shown.

[0054] It should be noted that after the temperature rise test with load loss, the three low-voltage winding terminals 2 will generate heat after being short-circuited by the clamp and the short-circuit connecting piece. After the winding and core temperatures reach stability, the tester will determine whether the transformer 1 is qualified by comprehensive calculation by detecting the winding resistance, winding and core temperature rise and combining the temperature rise test under the no-load loss test.

[0055] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A universal short-circuit current-carrying device for testing box-type transformers, characterized in that: include: A clamp member, the clamp member comprising a clamp connection support member, a clamp quick release member and a clamp pre-tightening member, the clamp quick release member and the clamp pre-tightening member are both connected to the clamp connection support member; A short-circuit connecting piece is clamped and electrically connected to the transformer by the connected clamp piece. The short-circuit connecting piece includes a short-circuit connecting frame and a short-circuit connecting plate. The short-circuit connecting plate is on the short-circuit connecting frame and is clamped and connected to the low-voltage winding terminal of the transformer by the clamp quick-release piece and the clamp pre-tightening piece to electrically connect multiple low-voltage winding terminals.

2. The universal short-circuit current-carrying device for testing box-type transformer according to claim 1 is characterized in that: The clamp connection support member includes a clamp connection support frame, and the clamp connection support frame can be sleeved outside the low-voltage winding terminal of the transformer; multiple clamp connection support frames correspond to multiple low-voltage winding terminals one by one; the clamp quick-release part includes a single quick-release part and a unified quick-release part, the single quick-release part is arranged on the clamp connection support frame, and the unified quick-release part is arranged on the single quick-release part.

3. The universal short-circuit current-carrying device for testing box-type transformer according to claim 2 is characterized in that: The single quick-release component includes a quick-release transmission shaft, a quick-release pressure pad, a first spring and a quick-release handle. One end of the quick-release transmission shaft slides through a groove wall of the clamp connection support frame. The quick-release pressure pad is arranged on one end of the quick-release transmission shaft and moves with it. The first spring is sleeved outside one end of the quick-release transmission shaft. One end of the quick-release handle is hinged to the other end of the quick-release transmission shaft, and the hinge between the quick-release handle and the quick-release transmission shaft is located at a non-center position of one end of the quick-release handle. Multiple sets of the single quick-release components correspond one by one to multiple clamp connection support frames.

4. The universal short-circuit current-carrying device for testing box-type transformer according to claim 3 is characterized in that: The unified quick-release part includes a quick-release transmission plate, the quick-release transmission plate is provided with a quick-release through hole, the quick-release through hole is sleeved outside the quick-release handle, a rotating shaft is provided on the inner wall of one end of the quick-release through hole, and the rotating shaft rotates through the rotating hole on the other end of the quick-release handle; the multiple quick-release through holes correspond one by one to the multiple sets of single quick-release parts.

5. The universal short-circuit current-carrying device for testing a box-type transformer according to any one of claims 2 to 4, characterized in that: The clamp pre-tightening member comprises a single pre-tightening transmission member and a unified pre-tightening transmission member, and both the single pre-tightening transmission member and the unified pre-tightening transmission member are arranged on the clamp connection support frame.

6. The universal short-circuit current-carrying device for testing box-type transformer according to claim 5 is characterized in that: The single pre-tightening transmission member comprises an axial pre-tightening transmission member and a circumferential transmission member, and both the axial pre-tightening transmission member and the circumferential transmission member are arranged on the clamp connection support frame.

7. The universal short-circuit current-carrying device for testing box-type transformer according to claim 6 is characterized in that: The axial preload transmission member comprises a screw and a preload washer. One end of the screw is rotatably embedded in a threaded hole on another groove wall of the clamp connection support frame. The preload washer is rotatably arranged on one end face of the screw.

8. The universal short-circuit current-carrying device for testing box-type transformer according to claim 5 is characterized in that: The circumferential transmission member includes a circumferential transmission tongue, a second spring and a circumferential transmission tube. One end of the circumferential transmission tongue is provided with an inclined surface, and the other end of the circumferential transmission tongue is slidably embedded in the transmission groove on the side wall of the other end of the screw rod. The second spring is embedded in the bottom of the transmission groove. One end of the circumferential transmission tube is sleeved on the other end of the screw rod and then rotatably set on the other groove wall of the clamp connecting support frame; the ratchet teeth on the inner wall of the circumferential transmission tube cooperate with one end of the circumferential transmission tongue; multiple sets of the single pre-tightening transmission members correspond one by one to multiple low-voltage winding terminals.

9. The universal short-circuit current-carrying device for testing box-type transformer according to claim 5, characterized in that: The unified pre-tightening transmission member includes a transmission rod, a worm gear and a rotating handle. The transmission rod is rotatably arranged on the mounting seat of the clamp connecting support frame, the worm gear is sleeved on the transmission rod, and the worm gear is meshed with the gear teeth on the outer wall of the circumferential transmission tube; the multiple worm gears correspond one by one to the multiple sets of the one-way pre-tightening transmission members to transmit to the multiple sets of the one-way pre-tightening transmission members, and the rotating handle is arranged on the free end of the transmission rod.

10. The universal short-circuit current-carrying device for testing box-type transformer according to claim 7, characterized in that: The short-circuit connection plate includes a hard connection plate and a soft connection plate, the hard connection plate is vertically fastened to the short-circuit connection frame, one end of the hard connection plate is used to be tightly pressed and electrically connected to the low-voltage winding terminal at the middle position by the pre-tightening pad; one end of the soft connection plate is electrically connected to the short-circuit connection frame, and the other end of the soft connection plate is used to be tightly pressed and electrically connected to the low-voltage winding terminal at the end position by the pre-tightening pad; the two soft connection plates are correspondingly connected to the two ends of the short-circuit connection frame, and the two soft connection plates are respectively connected to the two low-voltage winding terminals at the two end positions one by one; by adjusting the vertical position of the hard connection plate on the short-circuit connection frame, and adjusting the distance and angle of the soft connection plates at both ends of the short-circuit connection frame, the test requirements of low-voltage winding terminals with different spacings of different types of transformers can be met.

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