Mutual inductor handover test system and method

Abstract

The invention discloses a mutual inductor handover test system and method, and belongs to the technical field of handover tests. A mutual inductor handover test system comprises a test connection sleeve, a switching device and a tester, the test connection sleeve is connected with an input end of the switching device through a test line, a test port of the switching device is connected with the tester, and the test connection sleeve is connected with a screw of a secondary side terminal of a mutual inductor. The test connection sleeve comprises a shell and a plurality of clamping assemblies which are circumferentially and uniformly arranged in the shell, the shell is provided with a wiring socket, the shell is internally provided with a stress assembly used for driving the clamping assemblies to act, and the stress assembly is movably connected with the clamping assemblies; according to the invention, the screw of the secondary side terminal of the mutual inductor can be conveniently and rapidly clamped and positioned, the test connection sleeve and the screw are prevented from slipping and separating, and the test efficiency and the accuracy of test results are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of handover test, and in particular to a transformer handover test system and method. Background Art

[0002] Before electrical equipment arrives at the site for installation or after installation is completed, it is necessary to conduct a handover test on the electrical equipment. Through the test, hidden defects that may occur in the electrical equipment during factory transportation and on-site installation can be discovered in time, safety and quality accidents can be prevented, and the safe and reliable operation of the equipment can be ensured.

[0003] When conducting test wiring and short-circuiting on the secondary terminals of the transformer, it is a time-consuming and laborious problem to reliably connect the test wire and short-circuit the secondary terminals of the transformer. In the test, traditional test wire clamps are usually used to short-circuit the secondary terminals. However, due to the limited area of ​​the terminal nut and the smooth surface of the nut, the traditional test wire clamp is also easy to slip off the nut; in order to make the short-circuit more secure, sometimes we remove all the bolts of the transformer secondary terminal, insert the test wire clamp into the secondary terminal hole and clamp it. Although this method is more reliable than the above method, it takes too long and the removed nut gasket is easy to lose. When the test wire clamp is used to short-circuit the secondary terminal, not only is the operation very inconvenient, but it is also easy to slip and miss the short-circuit, resulting in the termination of the test, affecting the test data, prolonging the test time, and causing the secondary side to discharge during the withstand voltage test, resulting in equipment damage.

[0004] The Chinese invention with application number CN202010244602.7 in the prior art discloses a transformer handover test device and a test method thereof. By switching the switching device, the functions of secondary winding open circuit, short circuit, and grounding operations can be completed relatively quickly. However, in the specific operation process, since the screw and the gasket are generally tightly connected around them and there is no gap between the two, it is difficult for the test wire clamp to bite the contact surface of the groove between the screw and the gasket through the arc-shaped bite jaws; and in order to prevent the arc-shaped jaws from slipping off the screw, the test wire clamp still needs to screw the locking screw, which is cumbersome to operate, and thus the test efficiency and the accuracy of the results cannot be guaranteed. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to propose a transformer handover test system and method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A transformer handover test system comprises a test connection sleeve, a switching device and a tester, wherein the test connection sleeve is connected to the input end of the switching device through a test line, the test port of the switching device is connected to the tester, the test connection sleeve is connected to the screws of the transformer secondary terminal, the test connection sleeve comprises a shell and a plurality of clamping assemblies uniformly arranged in a circle in the shell, a wiring socket is arranged on the shell, a force-bearing assembly for driving the clamping assembly to move is arranged in the shell, and the force-bearing assembly is movably connected to the clamping assembly.

[0007] Preferably, the tester includes an insulation resistance tester, a transformation ratio tester, a transformer characteristic tester and a DC resistance tester.

[0008] Preferably, the clamping assembly includes a first elastic telescopic rod fixedly connected to the inner wall of the shell, a movable frame connected to the first elastic telescopic rod away from the inner wall of the shell, and a guide plate obliquely arranged at the bottom of the movable frame.

[0009] Preferably, the movable frame is rotatably connected to the guide plate via a pin shaft, the pin shaft is provided with a torsion spring for driving the guide plate to reset and rotate, a groove is provided in the movable frame, a plug rod is slidably connected in the groove, a fifth elastic element is provided between the plug rod and the inner wall of the groove, a square groove matching the plug rod is provided at the end of the guide plate, the movable frame is also rotatably connected to a swing plate via a rotating shaft, and a second pull rope is provided between the swing plate and the plug rod.

[0010] Preferably, the mobile frame includes a frame body connected to the first elastic telescopic rod, a mobile plate slidably connected to the frame body, a first elastic element arranged between the mobile plate and the frame body, and a rubber pad and a clamping head arranged on the mobile plate.

[0011] Preferably, the force-bearing component includes a force-bearing seat slidably connected in the shell and a second elastic element arranged between the force-bearing seat and the inner wall of the shell, the force-bearing seat is provided with a conical surface, and a first wedge block and a second wedge block that are movably abutted against each other are slidably connected in the shell, and one end of the first wedge block away from the second wedge block movably abuts against the conical surface, and an abutment block that movably abuts against the second wedge block is fixed on the movable plate, and the abutment block movably abuts against one end of the second wedge block away from the first wedge block.

[0012] Preferably, the first wedge block and the second wedge block are both provided with a sliding block, a sliding groove for sliding of the sliding block is provided in the housing, and a third elastic element is provided between the inner wall of the sliding groove and the sliding block.

[0013] Preferably, an air cavity is provided on the rubber pad, an air pipe connected to the air cavity is connected to the rubber pad, a pneumatic cavity connected to the end of the air pipe away from the rubber pad is provided on the force-bearing seat, a moving part is slidably connected to the pneumatic cavity, a fourth elastic element is provided between the moving part and the inner wall of the pneumatic cavity, a positioning hole matching the moving part is provided on the inner wall of the outer shell, the moving part includes a piston slidably connected in the pneumatic cavity, a second elastic telescopic rod connected to the piston, and a positioning block connected to the second elastic telescopic rod, and the positioning block is slidably connected in the positioning hole.

[0014] Preferably, the shell includes a shell and a top plate slidably connected to the top of the shell, a third elastic telescopic rod is arranged between the top plate and the top wall of the shell, a first pull rope is fixed to the positioning block, and the end of the first pull rope away from the positioning block passes through the second elastic telescopic rod, the piston, the force seat and the shell in sequence and is connected to the top plate.

[0015] The present invention also discloses a transformer handover test method, which is conducted by applying a transformer handover test system, and includes the following steps: S1: The shell of the test connection sleeve is inserted into the outer side of the screw of the secondary terminal of the transformer; S2: The screw applies force to the force-bearing component, the force-bearing component drives the clamping component to move, and the clamping component automatically clamps and positions the screw; S3: The test connection sleeve is connected to the input end of the switching device through the test line, so that the test port of the switching device is connected to the tester, and the switching device connects and short-circuits the secondary winding of the transformer; S4: The switching device conducts a secondary insulation resistance test, a grounding insulation resistance test between secondary windings, a transformation ratio test, an excitation characteristic and polarity calibration test, and a DC resistance test in sequence through four sets of switching circuits.

[0016] Compared with the prior art, the present invention provides a transformer handover test system and method, which has the following beneficial effects: 1. The transformer handover test system and method inserts the outer shell of the test connection sleeve into the outer side of the screw of the transformer secondary terminal, and the force-bearing component automatically drives the clamping component to move, so as to quickly clamp and position the screw of the transformer secondary terminal, thereby improving the test efficiency.

[0017] 2. The transformer handover test system and method pushes the guide plate through the screws, and the guide plate drives the movable frame to move toward the inner wall of the shell, so that the enclosed space formed between the multiple movable frames in the shell can adapt to screws of different sizes. It has strong applicability, and the setting of the guide plate makes it easy for the shell to be quickly sleeved on the outside of the screw without precise alignment and matching, thereby improving the test efficiency.

[0018] 3. The transformer handover test system and method, through the side wall of the screw abutting against the swing plate on the outside of the movable frame, the swing plate is deflected by the force and applies tension to the second pull rope, the second pull rope pulls the insertion rod to retract into the groove, the insertion rod no longer limits the guide plate, the guide plate is no longer restricted, as the shell continues to be downwardly sleeved on the outside of the screw, the guide plate is blocked and fits to the bottom of the movable frame, so that the shell can continue to move downward, the screw goes deeper into the shell, the clamping area of ​​the movable frame inside the shell on the side of the screw is increased, and the clamping effect of the screw is improved.

[0019] 4. The transformer handover test system and method drives the rubber pad and the chuck to move toward the screw through the moving plate. The setting of the moving plate squeezing the rubber pad further improves the clamping stability of the screw and avoids the phenomenon of unstable clamping caused by only pushing the frame to abut against the screw through the reaction of the compressed first elastic telescopic rod. When the rubber pad is squeezed, the air in the air cavity is introduced into the pneumatic cavity through the air pipe, and the positioning block is forcefully inserted in the positioning hole to limit the position of the force-bearing seat, so as to avoid the compressed second elastic element always having a rebound force during the test, causing the force-bearing seat to push the screw downward, resulting in unstable clamping between the housing and the screw and easy slippage, thereby ensuring the accuracy of the test results and the smooth progress of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 The structure of the present invention is schematically shown Figure 2 ; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 For the present invention Figure 3 A partial enlarged structural diagram of the middle part; Figure 5 It is a schematic cross-sectional structure diagram of the mobile rack of the present invention; Figure 6 It is a schematic diagram of the connection structure of the first pull rope end of the present invention; Figure 7 It is a structural schematic diagram of the present invention when the movable frame is separated from the guide plate; Figure 8 It is a partial cross-sectional structural schematic diagram of the force bearing seat of the present invention; Fig. 9 It is a schematic diagram of the connection structure of the switching device of the present invention.

[0021] In the figure: 1, test connection sleeve; 2, switching device; 3, tester; 4, screw; 5, shell; 501, shell; 502, top plate; 503, third elastic telescopic rod; 504, wiring socket; 6, first elastic telescopic rod; 601, mobile frame; 6011, frame body; 6012, mobile plate; 6013, first elastic element; 6014, rubber pad; 6015, chuck; 602, guide plate; 7, force bearing seat; 701, second elastic element; 702, conical surface ; 8. first wedge block; 9. second wedge block; 10. abutment block; 11. slide groove; 111. slider; 112. third elastic element; 12. air cavity; 13. pneumatic cavity; 131. fourth elastic element; 14. moving part; 141. piston; 142. second elastic telescopic rod; 143. positioning block; 15. positioning hole; 16. first pull rope; 17. groove; 171. plug rod; 172. fifth elastic element; 18. square groove; 19. swing plate; 191. second pull rope. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example: Refer to Figure 1 , Figure 2 , Figure 3 and Fig. 9 A transformer handover test system includes a test connection sleeve 1, a switching device 2 and a tester 3. The test connection sleeve 1 is connected to the input end of the switching device 2 through a test line, the test port of the switching device 2 is connected to the tester 3, the test connection sleeve 1 is connected to the screw 4 of the transformer secondary terminal, the test connection sleeve 1 includes a shell 5 and a plurality of clamping components uniformly arranged in a circle in the shell 5, a wiring socket 504 is arranged on the shell 5, a force-bearing component for driving the clamping component to move is arranged in the shell 5, and the force-bearing component is movably connected to the clamping component.

[0026] Furthermore, the tester 3 includes an insulation resistance tester, a transformation ratio tester, a transformer characteristic tester and a DC resistance tester.

[0027] Specifically, the shell 5 of the test connection sleeve 1 is inserted into the outside of the screw 4 of the secondary terminal of the transformer, the force-bearing component automatically drives the clamping component to move, so that the clamping component automatically clamps and positions the screw 4, the test connection sleeve 1 is connected to the input end of the switching device 2 through the test line, and the test port of the switching device 2 is connected to the tester 3. The test connection sleeve 1 can clamp the screw 4 of the secondary terminal of the transformer, the switching device 2 connects and short-circuits the secondary winding of the transformer, and the tester 3 includes an insulation resistance tester, a ratio tester, a transformer characteristic tester and a DC resistance tester; the switching device 2 includes four groups of switching circuits, namely: a first group of secondary winding switching circuits, a second group of secondary winding switching circuits, a third group of secondary winding switching circuits and a fourth group of secondary winding switching circuits, thereby realizing a primary-to-secondary insulation resistance test, an insulation resistance test of grounding between secondary windings, a ratio test, an excitation characteristic and polarity calibration test and a DC resistance test. The switching device 2 is a prior art and will not be described in detail here.

[0028] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7 As a preferred technical solution of the present invention, the clamping assembly includes a first elastic telescopic rod 6 fixedly connected to the inner wall of the shell 5, a movable frame 601 connected to the first elastic telescopic rod 6 away from the inner wall of the shell 5, and a guide plate 602 obliquely arranged at the bottom of the movable frame 601; specifically, the staff sleeves the test connection sleeve 1 on the outside of the screw 4 of the secondary terminal of the transformer, the screw 4 pushes the guide plate 602, and the guide plate 602 drives the movable frame 601 to move toward the inner wall of the shell 5, so that the enclosed space formed between the multiple movable frames 601 in the shell 5 is adapted to screws 4 of different sizes, and the applicability is strong. The setting of the guide plate 602 facilitates the shell 5 to be quickly sleeved on the outside of the screw 4 without the need for precise alignment and matching.

[0029] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 As a preferred technical solution of the present invention, the movable frame 601 is rotatably connected to the guide plate 602 through a pin shaft, and a torsion spring is arranged on the pin shaft for driving the guide plate 602 to reset and rotate. A groove 17 is provided in the movable frame 601, and a plug rod 171 is slidably connected in the groove 17. A fifth elastic element 172 is arranged between the plug rod 171 and the inner wall of the groove 17. A square groove 18 matching the plug rod 171 is provided at the end of the guide plate 602. The movable frame 601 is also rotatably connected to a swing plate 19 through a rotating shaft, and a second pull rope 191 is arranged between the swing plate 19 and the plug rod 171.

[0030] Furthermore, an end of the insertion rod 171 away from the fifth elastic element 172 is provided with an extrusion slope, and the extrusion slope movably abuts against the guide plate 602 .

[0031] Specifically, when the screw 4 of the secondary terminal of the transformer is placed in the space surrounded by the multiple mobile frames 601, the side wall of the screw 4 abuts against the swing plate 19 on the outside of the mobile frame 601, and the swing plate 19 is deflected by the force and exerts a pulling force on the second pull rope 191. The second pull rope 191 pulls the plug 171 to retract into the groove 17, and the plug 171 no longer limits the guide plate 602, and the guide plate 602 is no longer restricted. As the housing 5 continues to be downwardly sleeved on the outside of the screw 4, the guide plate 602 is blocked and moves backward. The bottom of the frame 601 fits together, so that the shell 5 can continue to move downward, and the screw 4 goes deeper into the shell 5, increasing the clamping area of ​​the movable frame 601 inside the shell 5 on the side of the screw 4, thereby improving the clamping effect on the screw 4. When the shell 5 is separated from the screw 4, the guide plate 602 at the bottom of the shell 5 is no longer subjected to force and resets and rotates under the action of the torsion spring. After the side wall of the screw 4 no longer abuts against the swing plate 19, the insertion rod 171 is reinserted into the square groove 18 under the push of the fifth elastic element 172 to limit the guide plate 602.

[0032] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As a preferred technical solution of the present invention, the mobile frame 601 includes a frame body 6011 connected to the first elastic telescopic rod 6, a mobile plate 6012 slidably connected to the frame body 6011, a first elastic element 6013 arranged between the mobile plate 6012 and the frame body 6011, and a rubber pad 6014 and a clamp 6015 arranged on the mobile plate 6012.

[0033] Furthermore, the force-bearing component includes a force-bearing seat 7 slidably connected in the outer shell 5 and a second elastic element 701 arranged between the force-bearing seat 7 and the inner wall of the outer shell 5. A conical surface 702 is opened on the force-bearing seat 7. A first wedge block 8 and a second wedge block 9 that are movably abutted against each other are slidably connected in the outer shell 5. The end of the first wedge block 8 away from the second wedge block 9 movably abuts against the conical surface 702. An abutment block 10 that is movably abutted against the second wedge block 9 is fixed on the movable plate 6012. The abutment block 10 movably abuts against the end of the second wedge block 9 away from the first wedge block 8.

[0034] Furthermore, a slider 111 is disposed on each of the first wedge block 8 and the second wedge block 9 , a slide groove 11 for the slider 111 to slide is provided in the housing 5 , and a third elastic element 112 is provided between the inner wall of the slide groove 11 and the slider 111 .

[0035] Specifically, the housing 5 of the test connecting sleeve 1 is inserted into the screw 4 of the secondary terminal of the transformer, the screw 4 abuts against the force-bearing seat 7, the second elastic element 701 is compressed, the force-bearing seat 7 moves up inside the housing 5, and the conical surface 702 of the force-bearing seat 7 abuts against the first wedge block 8, the first wedge block 8 abuts against the second wedge block 9, and the second wedge block 9 pushes the abutment block 10, so that the abutment block 10 drives the movable plate 6012 to move relative to the frame 6011, and the movable plate 6012 drives the rubber pad 6014 and the chuck 6015 to move toward the screw 4. The setting of the rubber pad 6014 further increases the clamping contact surface between the movable frame 601 and the screw 4, improves the clamping stability of the screw 4, and avoids the phenomenon of unstable clamping caused by only pushing the frame 6011 to abut against the screw 4 through the reaction of the compressed first elastic telescopic rod 6.

[0036] Reference Figure 3 , Figure 4 , Figure 5 and Figure 8 As a preferred technical solution of the present invention, an air cavity 12 is provided on the rubber pad 6014, an air pipe connected to the air cavity 12 is connected to the rubber pad 6014, a pneumatic cavity 13 connected to the end of the air pipe away from the rubber pad 6014 is provided on the force-bearing seat 7, a moving part 14 is slidably connected to the pneumatic cavity 13, a fourth elastic element 131 is provided between the moving part 14 and the inner wall of the pneumatic cavity 13, a positioning hole 15 matching the moving part 14 is provided on the inner wall of the outer shell 5, the moving part 14 includes a piston 141 slidably connected in the pneumatic cavity 13, a second elastic telescopic rod 142 connected to the piston 141, and a positioning block 143 connected to the second elastic telescopic rod 142, and the positioning block 143 is slidably connected in the positioning hole 15.

[0037] Specifically, when the movable plate 6012 drives the rubber pad 6014 to clamp and position the side wall of the screw 4, the air in the air cavity 12 of the rubber pad 6014 is introduced into the pneumatic cavity 13 through the trachea, and the air in the pneumatic cavity 13 pushes the piston 141 to move, so that the piston 141 drives the positioning block 143 to be inserted into the positioning hole 15 through the second elastic telescopic rod 142, thereby limiting the position of the force-bearing seat 7, and avoiding the compressed second elastic element 701 always having a rebound force during the test, so that the force-bearing seat 7 pushes the screw 4 downward, resulting in unstable clamping of the housing 5 and the screw 4 and easy slippage, thereby ensuring the accuracy of the test results and the smooth progress of the test.

[0038] Reference Figure 3 , Figure 4 and Figure 8 As a preferred technical solution of the present invention, the housing 5 includes a shell 501 and a top plate 502 slidably connected to the top of the shell 501, a third elastic telescopic rod 503 is arranged between the top plate 502 and the top wall of the shell 501, a first pull rope 16 is fixed on the positioning block 143, and the end of the first pull rope 16 away from the positioning block 143 passes through the second elastic telescopic rod 142, the piston 141, the force seat 7 and the shell 501 in sequence and is connected to the top plate 502; specifically, when it is necessary to release the clamping state of the test connection sleeve 1 and the screw 4, the staff pulls the top plate 50 2. Move the top plate 502 relative to the shell 501. When the top plate 502 moves, tension is applied to the first pull rope 16. The first pull rope 16 pulls the positioning block 143. The positioning block 143 moves out of the positioning hole 15 and squeezes the second elastic telescopic rod 142, so that the force-bearing seat 7 and the shell 501 are no longer locked. As the tension is continued to be applied to the top plate 502, the top plate 502 drives the shell 501 to move upward through the third elastic telescopic rod 503, so that the force-bearing seat 7 no longer squeezes the screw 4, and the clamping assembly releases the clamping and positioning state of the screw 4. The operation is simple and quick, which is convenient for improving the test efficiency.

[0039] The present invention also discloses a transformer handover test method, which is conducted by applying a transformer handover test system, and includes the following steps: S1: The housing 5 of the test connection sleeve 1 is inserted into the outer side of the screw 4 of the secondary terminal of the transformer; S2: The screw 4 applies force to the force-bearing component, the force-bearing component drives the clamping component to move, and the clamping component automatically clamps and positions the screw 4; S3: The test connection sleeve 1 is connected to the input end of the switching device 2 through the test line, so that the test port of the switching device 2 is connected to the tester 3, and the switching device 2 connects and short-circuits the secondary winding of the transformer; S4: The switching device 2 sequentially performs a secondary insulation resistance test, an insulation resistance test for grounding between secondary windings, a transformation ratio test, an excitation characteristic and polarity calibration test, and a DC resistance test through four sets of switching circuits.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A transformer handover test system, comprising a test connection sleeve (1), a switching device (2) and a tester (3), characterized in that: The test connection sleeve (1) is connected to the input end of the switching device (2) through a test line, the test port of the switching device (2) is connected to the tester (3), the test connection sleeve (1) is connected to the screw (4) of the secondary terminal of the transformer, the test connection sleeve (1) comprises a housing (5) and a plurality of clamping components uniformly arranged in a circumference in the housing (5), the housing (5) is provided with a wiring socket (504), the housing (5) is provided with a force-bearing component for driving the clamping component to move, and the force-bearing component is movably connected to the clamping component.

2. A transformer handover test system according to claim 1, characterized in that: The tester (3) comprises an insulation resistance tester, a transformation ratio tester, a transformer characteristic tester and a DC resistance tester.

3. A transformer handover test system according to claim 1, characterized in that: The clamping assembly comprises a first elastic telescopic rod (6) fixedly connected to the inner wall of the outer shell (5), a movable frame (601) connected to the first elastic telescopic rod (6) away from the inner wall of the outer shell (5), and a guide plate (602) obliquely arranged at the bottom of the movable frame (601).

4. A transformer handover test system according to claim 3, characterized in that: The movable frame (601) is rotatably connected to the guide plate (602) via a pin shaft, and a torsion spring for driving the guide plate (602) to return and rotate is arranged on the pin shaft. A groove (17) is provided in the movable frame (601), and a plug rod (171) is slidably connected in the groove (17). A fifth elastic element (172) is arranged between the plug rod (171) and the inner wall of the groove (17). A square groove (18) matching with the plug rod (171) is provided at the end of the guide plate (602). The movable frame (601) is also rotatably connected to a swing plate (19) via a rotating shaft, and a second pull rope (191) is arranged between the swing plate (19) and the plug rod (171).

5. A transformer handover test system according to claim 4, characterized in that: The mobile frame (601) comprises a frame body (6011) connected to a first elastic telescopic rod (6), a mobile plate (6012) slidably connected inside the frame body (6011), a first elastic element (6013) arranged between the mobile plate (6012) and the frame body (6011), and a rubber pad (6014) and a clamp (6015) arranged on the mobile plate (6012).

6. A transformer handover test system according to claim 5, characterized in that: The force-bearing component comprises a force-bearing seat (7) slidably connected in the housing (5) and a second elastic element (701) arranged between the force-bearing seat (7) and the inner wall of the housing (5); a conical surface (702) is provided on the force-bearing seat (7); a first wedge block (8) and a second wedge block (9) movably abutting against each other are slidably connected in the housing (5); an end of the first wedge block (8) away from the second wedge block (9) movably abuts against the conical surface (702); an abutting block (10) movably abuts against the second wedge block (9) is fixedly provided on the movable plate (6012); the abutting block (10) movably abuts against an end of the second wedge block (9) away from the first wedge block (8).

7. A transformer handover test system according to claim 6, characterized in that: The first wedge block (8) and the second wedge block (9) are both provided with a sliding block (111), a sliding groove (11) for the sliding block (111) to slide is provided in the housing (5), and a third elastic element (112) is provided between the inner wall of the sliding groove (11) and the sliding block (111).

8. A transformer handover test system according to claim 7, characterized in that: The rubber pad (6014) is provided with an air cavity (12), the rubber pad (6014) is connected with an air pipe communicating with the air cavity (12), the force bearing seat (7) is provided with a pneumatic cavity (13) communicating with an end of the air pipe away from the rubber pad (6014), the pneumatic cavity (13) is slidably connected with a moving part (14), a fourth elastic element (131) is provided between the moving part (14) and the inner wall of the pneumatic cavity (13), the inner wall of the housing (5) is provided with a positioning hole (15) matching with the moving part (14), the moving part (14) comprises a piston (141) slidably connected in the pneumatic cavity (13), a second elastic telescopic rod (142) connected to the piston (141), and a positioning block (143) connected to the second elastic telescopic rod (142), the positioning block (143) being slidably connected in the positioning hole (15).

9. A transformer handover test system according to claim 8, characterized in that: The housing (5) comprises a shell (501) and a top plate (502) slidably connected to the top of the shell (501); a third elastic telescopic rod (503) is arranged between the top plate (502) and the top wall of the shell (501); a first pull rope (16) is fixedly arranged on the positioning block (143); an end of the first pull rope (16) away from the positioning block (143) passes through the second elastic telescopic rod (142), the piston (141), the force bearing seat (7) and the shell (501) in sequence and is connected to the top plate (502).

10. A transformer handover test method, which is performed by applying a transformer handover test system according to claim 9, characterized in that: The following steps are involved: S1: The housing (5) of the test connection sleeve (1) is inserted outside the screw (4) of the secondary terminal of the transformer; S2: The screw (4) applies a force to the force-bearing component, the force-bearing component drives the clamping component to move, and the clamping component automatically clamps and positions the screw (4); S3: The test connection sleeve (1) is connected to the input end of the switching device (2) through a test line, so that the test port of the switching device (2) is connected to the tester (3), and the switching device (2) connects and short-circuits the secondary winding of the transformer; S4: The switching device (2) performs a secondary insulation resistance test, an insulation resistance test between the secondary windings and the grounding test, a transformation ratio test, an excitation characteristic and polarity calibration test, and a DC resistance test in sequence through four sets of switching circuits.

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