Special tool for measuring loop resistance of 10kV vacuum circuit breaker and use method of special tool

Abstract

The invention discloses a special tool for measuring loop resistance of a 10kV vacuum circuit breaker and a use method thereof, and relates to the technical field of vacuum circuit breaker measurement, and the special tool comprises a moving unit which comprises a fixed rod, a movable rod arranged at the inner side of the fixed rod, a clamping sleeve arranged at the outer side of one end of the fixed rod, and a guide column arranged at the end part of the movable rod, the binding post is arranged on the outer side of the guide post; and the guide post moves synchronously along with the movable rod, so that the resistance measurement position can be changed. The beneficial effects of the invention are that the measurement position can be flexibly adjusted through the arranged guide column; technicians can conveniently detect the resistance value of the tulip contact; meanwhile, technicians can locate problems more quickly and accurately and carry out targeted maintenance, the maintenance cost is reduced, the maintenance time is shortened, and meanwhile the safety and standardization of overall operation are improved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum circuit breaker measurement, in particular to a special tool for measuring loop resistance of a 10kV vacuum circuit breaker and a method for using the special tool for measuring loop resistance of a 10kV vacuum circuit breaker. Background Art

[0002] The 10kV vacuum circuit breaker is a key device for controlling and protecting high-voltage lines in power systems. It uses vacuum arc extinguishing and has high reliability and long life. It uses copper-chromium or copper-tungsten alloy contact materials, ceramic or glass insulation, and metallized ceramic seals to maintain the vacuum state. The operating mechanism includes spring energy storage and electromagnetic drive to ensure fast opening and closing. Modern circuit breakers integrate CT, PT and sensors to achieve real-time monitoring and protection, and support remote monitoring and automatic maintenance functions.

[0003] In the test of conventional 10kV vacuum circuit breakers, the large current alligator wire clips provided by the manufacturer are usually used to clamp the plum blossom contacts for overall testing; in daily loop resistance tests, it is sometimes necessary to accurately measure the resistance values ​​at both ends of the vacuum bubble to rule out whether the vacuum bubble is defective; however, the large alligator wire clips provided by the manufacturer cannot meet the requirements of on-site wiring, and may also damage the spring force of the plum blossom contacts when used improperly, resulting in inaccurate test results and equipment damage. Summary of the invention

[0004] In view of the above-mentioned prior art problems, the present invention is proposed.

[0005] The present invention aims to provide a special tool for measuring loop resistance of a 10kV vacuum circuit breaker, and aims to solve the problem that the existing resistance measuring tools cannot meet the use requirements in daily loop resistance tests.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A special tool for measuring loop resistance of a 10kV vacuum circuit breaker, comprising: a moving unit, comprising a fixed rod, a movable rod arranged inside the fixed rod, a clamping sleeve arranged outside one end of the fixed rod, a guide post arranged at the end of the movable rod, and a terminal arranged outside the guide post;

[0007] The guide column moves synchronously with the movable rod, thereby being able to change the position of resistance measurement.

[0008] As a preferred solution of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention, wherein: the fixing rod comprises a first connecting end arranged at the end;

[0009] The clamping sleeve comprises a connecting portion and a clamping portion; an internal thread structure adapted to the first connecting end is provided inside the connecting portion;

[0010] The movable rod passes through the clamping sleeve and the fixing rod and extends to the outside thereof.

[0011] As a preferred solution of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention, wherein: the movable rod further comprises a conical plate arranged on its side wall; the conical plate is located inside the clamping part and moves;

[0012] The conical plate can collide with the inner wall of the clamping portion, thereby enlarging the opening of the end of the clamping portion.

[0013] As a preferred solution of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention, wherein: the movable rod penetrates the fixed rod and extends outward;

[0014] The movable rod comprises a second connecting end arranged at the end thereof, and an internal thread structure matched with the second connecting end is provided inside the guide column.

[0015] As a preferred solution of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention, it also includes a holding unit, including a handle and a connecting buckle for connecting the handle to the movable rod.

[0016] As a preferred solution of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention, wherein: the fixing rod comprises an articulated seat arranged on the side wall thereof;

[0017] The handle includes a first rotating column disposed at an end thereof;

[0018] The first rotating column is matched with the hinge seat, and the handle is hinged to the fixing rod.

[0019] As a preferred solution of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention, wherein: the movable rod further comprises a connecting plate arranged at the end thereof;

[0020] The handle further includes a second rotating column on the side wall;

[0021] One end of the connecting buckle is hinged to the connecting plate, and the other end of the connecting buckle is hinged to the second rotating column.

[0022] As a preferred solution of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention, the number of the handles is two groups, and the two groups of handles are symmetrically arranged on both sides of the fixing rod;

[0023] The number of the connecting buckles corresponds to the number of the handles;

[0024] The rotation of the handle can push the movable rod to move along the axial direction of the fixed rod.

[0025] As a preferred solution of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention, two groups of the terminal posts are arranged on the outer wall of the clamping portion.

[0026] The beneficial effects of the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention are as follows: the measuring position can be flexibly adjusted by means of the provided guide column; it is more convenient for technicians to detect the resistance value of the plum blossom contact; at the same time, the technicians can locate the problem more quickly and accurately and carry out targeted maintenance, thereby reducing maintenance costs and time, and improving the safety and standardization of the overall operation.

[0027] Another object of the present invention is to provide a method for using a special tool for measuring loop resistance of a 10kV vacuum circuit breaker, which aims to solve the problem that the spring of the plum blossom contact may be damaged during the resistance measurement process of the existing large current alligator wire clamp.

[0028] In order to solve the above technical problems, the present invention also provides the following technical solutions: a method for using a special tool for measuring loop resistance of a 10kV vacuum circuit breaker, comprising a special tool for measuring loop resistance of a 10kV vacuum circuit breaker; and, S1: installing the guide post at the end of the movable rod, and then connecting the voltage loop of the resistance detection device to the terminal arranged on the side wall of the guide post, and connecting the current loop to the terminal arranged on the side wall of the connecting part;

[0029] S2: The end of the clamping portion is then placed inside the plum blossom contact, and the handle is pulled so that the end of the clamping portion expands and squeezes the inner wall of the plum blossom contact, thereby detecting the fatigue damage degree of the spring;

[0030] S3: When the handle is pulled, the movable rod drives the guide column to move, so that the end of the guide column enters the interior of the vacuum circuit breaker, thereby flexibly adjusting the measuring position of the guide column.

[0031] The beneficial effect of the method for using the special tool for measuring loop resistance of a 10kV vacuum circuit breaker of the present invention is that the method can reduce the damage to the plum blossom contact spring, extend the service life of the equipment, and improve the efficiency and reliability of fault diagnosis, thereby ensuring the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0034] Figure 2 It is a schematic diagram of the explosion structure in the present invention.

[0035] Figure 3 It is a half-section view in the present invention. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Example 1

[0040] Reference Figure 1 , is the first embodiment of the present invention, which provides a special tool for measuring loop resistance of a 10kV vacuum circuit breaker, including a moving unit 100, including a fixed rod 101, a movable rod 102 arranged on the inner side of the fixed rod 101, a clamping sleeve 103 arranged on the outer side of one end of the fixed rod 101, a guide column 104 arranged on the end of the movable rod 102, and a terminal 105 arranged on the outer side of the guide column 104; the guide column 104 moves synchronously with the movable rod 102, thereby being able to change the position of resistance measurement.

[0041] In this embodiment, the fixed rod 101 is a hollow tubular structure; assuming that the fixed rod 101 is in a fixed position, the movable rod 102 passes through the internal through hole of the fixed rod 101 and extends outward, and the movable rod 102 can move along the axial direction of the fixed rod 101.

[0042] It should be noted that the clamping sleeve 103 is arranged on one side of the end of the fixed rod 101, and the clamping sleeve 103 and the fixed rod 101 are connected and fixed by clamping; the end of the movable rod 102 penetrates the fixed rod 101 and also penetrates the clamping sleeve 103 and extends to the inside of the clamping sleeve 103.

[0043] Specifically, the outer wall of the clamping sleeve 103 can undergo a certain telescopic deformation; when the movable rod 102 moves, its outer wall contacts the inner wall of the clamping sleeve 103, thereby squeezing the end of the clamping sleeve 103 to open; thereby making the end of the clamping sleeve 103 contact the inner wall of the plum blossom contact.

[0044] It should be noted that the guide column 104 and the movable rod 102 are connected by welding and fixing. The movable rod 102 moves and the guide column 104 can be driven to move at the same time, and a terminal 105 is provided on the side wall of the guide column 104; the end of the guide column 104 extends into the interior of the plum blossom contact; thus, the measuring position can be changed by extending the guide column 104 to different distances; the resistance of the plum blossom contact can be better measured, and the outer wall of the guide column 104 is made of an insulating structure, which can effectively avoid contact between its side wall and the plum blossom contact, thereby ensuring the accuracy of the resistance measurement.

[0045] When in use, the end of the clamping sleeve 103 is inserted into the interior of the plum blossom contact, and then the movable rod 102 is pushed to move, so that the movement of the movable rod 102 can drive the guide column 104 to move, so that the guide column 104 can enter the interior of the vacuum circuit breaker, and the position of the resistance measurement can be flexibly changed; while moving, the movable rod 102 can use its outer wall to squeeze the inner wall of the clamping sleeve 103, so that the end of the clamping sleeve 103 expands, so that the outer wall of the clamping sleeve 103 can contact the inner wall of the plum blossom contact, and then the elastic fatigue strength can be detected.

[0046] In summary, the measuring position can be flexibly adjusted by setting the guide column, which better facilitates the technicians to detect the resistance value of the plum blossom contact. At the same time, the technicians can locate the problem more quickly and accurately and perform targeted maintenance, which reduces the maintenance cost and time, and improves the safety and standardization of the overall operation.

[0047] Example 2

[0048] Reference Figures 1 to 3 , which is the second embodiment of the present invention, includes: the fixed rod 101 includes a first connecting end 101a arranged at the end; the clamping sleeve 103 includes a connecting portion 103a and a clamping portion 103b; the connecting portion 103a is provided with an internal thread structure adapted to the first connecting end 101a; the movable rod 102 penetrates the clamping sleeve 103 and the fixed rod 101 and extends to the outside thereof.

[0049] In this embodiment, the interior of the fixed rod 101 is a hollow tubular structure, and a first connecting end 101a is provided outside one end of the fixed rod 101, and the first connecting end 101a is preferably an external threaded structure; the movable rod 102 penetrates the fixed rod 101 and extends outward.

[0050] It should be noted that the connecting portion 103a is a circular structure, and an internal thread structure compatible with the first connecting end 101a is opened inside the connecting portion 103a; the clamping sleeve 103 and the fixing rod 101 can be connected by threaded cooperation between the first connecting end 101a and the threaded hole opened in the center position of the connecting portion 103a.

[0051] Furthermore, the movable rod 102 also includes a conical plate 102a arranged on its side wall; the conical plate 102a is located inside the clamping part 103b and moves; the conical plate 102a can conflict with the inner wall of the clamping part 103b, thereby achieving a larger opening at the end of the clamping part 103b.

[0052] It should be noted that the conical plate 102a is a truncated cone structure, and the interior of the conical plate 102a is a hollow structure, which can effectively save the material used for the equipment; and the conical plate 102a is located inside the clamping portion 103b and moves, and the end of the conical plate 102a with a smaller diameter is close to the opening end of the clamping portion 103b. When the conical plate 102a approaches the opening end of the clamping portion 103b, the side wall of the conical plate 102a will contact the inner wall of the clamping portion 103b, thereby pushing the free end of the clamping portion 103b to open; thereby, the outer wall of the clamping portion 103b can be in contact with the inner wall of the plum blossom contact, and the plum blossom contact can be opened, so that the plum blossom contact can be removed.

[0053] Furthermore, the movable rod 102 penetrates the fixed rod 101 and extends outward; the movable rod 102 includes a second connecting end 102b arranged at its end, and an internal thread structure adapted to the second connecting end 102b is provided inside the guide column 104.

[0054] It should be noted that a second connecting end 102b is provided on the outer side of the end portion of the movable rod 102 close to the conical plate 102a; and the second connecting end 102b is preferably an external threaded structure, and the second connecting end 102b is threadedly connected to one end of the guide column 104; through the cooperation between the guide column 104 and the second connecting end 102b, a detachable connection between the guide column 104 and the movable rod 102 can be achieved; during the process of using tools to disassemble the plum blossom contact, the guide column 104 does not need to be installed, and it is only necessary to expand the end of the clamping portion 103b.

[0055] When the resistance of the vacuum circuit breaker needs to be tested, the guide column 104 can be quickly connected to the second connection end 102b, and then the guide column 104 can contact different positions inside the vacuum circuit breaker, so that the resistance at different positions of the vacuum circuit breaker can be changed for testing; making the resistance detection more accurate.

[0056] Furthermore, it also includes a holding unit 200, including a handle 201 and a connecting buckle 202 for connecting the handle 201 and the movable rod 102.

[0057] In this embodiment, the handle 201 and the connecting buckle 202 can cooperate with the movable rod 102. When the handle 201 rotates, it can drive the movable rod 102 to move along the axial direction of the fixed rod 101, so as to achieve the purpose of holding the handle 201 with one hand and then pushing the guide column 104 to detect the change of the resistor position, making it easier for the staff to operate.

[0058] Furthermore, the fixed rod 101 includes a hinge seat 101b arranged on its side wall; the handle 201 includes a first rotating column 201a arranged on its end; the first rotating column 201a is adapted to the hinge seat 101b, and the handle 201 is hinged to the fixed rod 101.

[0059] It should be noted that the hinge seat 101b is hinged to the first rotating column 201a, and when the handle 201 is held, the first rotating column 201a can rotate along the axial hole inside the hinge seat 101b; the position between the fixed rod 101 and the handle 201 is relatively fixed; and the second rotating column 201b is located on one side of the first rotating column 201a.

[0060] Furthermore, the movable rod 102 also includes a connecting plate 102c arranged at its end; the handle 201 also includes a second rotating column 201b on the side wall; one end of the connecting buckle 202 is hinged to the connecting plate 102c, and the other end thereof is hinged to the second rotating column 201b.

[0061] It should be noted that the connecting plate 102c is arranged at the end of the movable rod 102, one end of the connecting buckle 202 is hinged and rotated with the connecting plate 102c, and the other end of the connecting buckle 202 is hinged and rotated with the second rotating column 201b; when the handle 201 is pulled to rotate, the handle 201 rotates along the axial hole of the hinge seat 101b; the handle 201 rotates and the connecting buckle 202 is driven to rotate; the connecting buckle 202 rotates and the movable rod 102 is pushed to move along the axial direction of the fixed rod 101.

[0062] Furthermore, two groups of connecting posts 105 are provided on the outer wall of the clamping portion 103 b.

[0063] It should be noted that the number of terminal posts 105 is arranged outside the clamping portion 103b, and the terminal posts 105 can be better connected to an external resistance tester, thereby measuring the resistance at the end of the plum blossom contact; at the same time, the terminal posts 105 arranged outside the guide column 104 can be used to measure the resistance at different positions, making the detection of the vacuum circuit breaker more accurate.

[0064] When in use, the staff holds the handle 201 so that the end of the handle 201 can rotate along the axis direction of the hinge seat 101b. While the handle 201 rotates, the movable rod 102 can be pushed to move through the connecting buckle 202, so that the movable rod 102 moves along the axis direction of the fixed rod 101; as the movable rod 102 moves, the guide column 104 can be driven to move. When the guide column 104 moves, its position inside the vacuum circuit breaker can be changed, so that the resistance at different positions of the circuit breaker can be measured; while the movable rod 102 moves, the arc-shaped outer wall of the conical plate 102a contacts the inner wall of the clamping part 103b, and pushes the end of the clamping part 103b to be in an expanded state, so that the outer wall of the clamping part 103b can contact the inner wall of the plum blossom contact; so that the plum blossom contact can expand outward; and the fatigue strength of the spring can also be tested.

[0065] In summary, the guide column 104 is provided to change the detection position of the vacuum circuit breaker resistance, thereby realizing the detection of the vacuum circuit breaker resistance, making the resistance detection process more accurate; at the same time, the clamping portion 103b expands outward, and the elasticity of the outer side of the plum blossom contact can also be detected to detect the fatigue strength of the spring.

[0066] Example 3

[0067] This is the third embodiment of the present invention, which further provides a method for using a special tool for measuring loop resistance of a 10kV vacuum circuit breaker; comprising, S1: installing the guide column 104 at the end of the movable rod 102, and then connecting the voltage loop of the resistance detection equipment with the terminal 105 set on the side wall of the guide column 104, and connecting the current loop with the terminal 105 set on the side wall of the connecting part 103a.

[0068] In this embodiment, when the resistance needs to be tested, the wire is connected to the terminal 105, and then the wire is connected to the resistance testing instrument; then, the position of the guide post 104 is flexibly adjusted according to different testing positions.

[0069] S2: The end of the clamping portion 103b is then placed inside the plum blossom contact, and the handle 201 is pulled to expand the end of the clamping portion 103b and squeeze the inner wall of the plum blossom contact, thereby detecting the fatigue damage degree of the spring.

[0070] It should be noted that when measuring inside the circuit breaker, the guide column 104 is connected to the movable rod 102, and then the handle 201 is turned so that the handle 201 rotates to drive the movable rod 102 to move along the axis of the fixed rod 101. The movable rod 102 moves and can push the guide column 104 to move; the movement of the guide column 104 can change its position, thereby effectively realizing the detection of resistance at different positions of the vacuum circuit breaker.

[0071] Another method that can be adopted is to place the end of the clamping portion 103b inside the plum blossom contact, and then pull the handle 201 to drive the movable rod 102 to move along the axis of the fixed rod 101; as the movable rod 102 moves, the conical plate 102a can be driven to contact the inner wall of the clamping portion 103b, thereby causing the inner wall of the plum blossom contact to open; the clamping sleeve 103 is made to contact the plum blossom contact, which can facilitate the connection between the resistance detection instrument and the connecting column; and then the resistance at the end of the vacuum circuit breaker can be detected.

[0072] By detecting the resistance at different positions of the vacuum circuit breaker, the detection position can be flexibly changed, making the resistance detection value more accurate.

[0073] S3: When the handle 201 is pulled, the movable rod 102 drives the guide column 104 to move, so that the end of the guide column 104 enters the interior of the vacuum circuit breaker, so that the measuring position of the guide column 104 can be flexibly adjusted.

[0074] It should be noted that, to adjust the position of the guide column 104, the handle 201 can be pulled to make the handle 201 rotate along the axial hole of the hinge seat 101b. When the handle 201 rotates, the movable rod 102 can be pushed to move along the axial direction of the fixed rod 101. Then, the movement of the movable rod 102 can drive the guide column 104 to move, so that the position of the guide column 104 inside the vacuum circuit breaker changes; thereby, the resistance at different positions can be detected; thereby, the resistance detection can be more accurate.

[0075] In summary, the above method can reduce the damage to the plum blossom contact spring, extend the service life of the equipment, and improve the efficiency and reliability of fault diagnosis, thereby ensuring the stable operation of the power system.

[0076] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A special tool for measuring loop resistance of a 10kV vacuum circuit breaker, characterized by: include, The mobile unit (100) comprises a fixed rod (101), a movable rod (102) arranged inside the fixed rod (101), a clamping sleeve (103) arranged outside one end of the fixed rod (101), a guide post (104) arranged at the end of the movable rod (102), and a terminal (105) arranged outside the guide post (104); The guide column (104) moves synchronously with the movable rod (102), thereby being able to change the position of resistance measurement.

2. The special tool for measuring loop resistance of a 10kV vacuum circuit breaker according to claim 1, characterized in that: The fixing rod (101) comprises a first connecting end (101a) arranged at an end portion; The clamping sleeve (103) comprises a connecting portion (103a) and a clamping portion (103b); an internal thread structure adapted to the first connecting end (101a) is provided inside the connecting portion (103a); The movable rod (102) passes through the clamping sleeve (103) and the fixed rod (101) and extends to the outside thereof.

3. The special tool for measuring loop resistance of a 10kV vacuum circuit breaker according to claim 2, characterized in that: The movable rod (102) further comprises a conical plate (102a) arranged on a side wall thereof; the conical plate (102a) is located inside the clamping portion (103b) and moves; The conical plate (102a) can come into contact with the inner wall of the clamping portion (103b), thereby enlarging the end opening of the clamping portion (103b).

4. The special tool for measuring loop resistance of a 10kV vacuum circuit breaker according to claim 2 or 3, characterized in that: The movable rod (102) passes through the fixed rod (101) and extends outwards; The movable rod (102) comprises a second connecting end (102b) arranged at the end thereof, and an internal thread structure matching the second connecting end (102b) is provided inside the guide column (104).

5. The special tool for measuring loop resistance of a 10kV vacuum circuit breaker according to claim 4, characterized in that: Also includes, The holding unit (200) comprises a handle (201) and a connecting buckle (202) for connecting the handle (201) to the movable rod (102).

6. The special tool for measuring loop resistance of a 10kV vacuum circuit breaker according to claim 5, characterized in that: The fixing rod (101) comprises a hinge seat (101b) arranged on a side wall thereof; The handle (201) comprises a first rotating column (201a) arranged at an end thereof; The first rotating column (201a) is matched with the hinge seat (101b), and the handle (201) is hinged to the fixing rod (101).

7. The special tool for measuring loop resistance of a 10kV vacuum circuit breaker according to claim 5 or 6, characterized in that: The movable rod (102) further comprises a connecting plate (102c) arranged at an end thereof; The handle (201) further comprises a second rotating column (201b) on the side wall; One end of the connecting buckle (202) is hinged to the connecting plate (102c), and the other end thereof is hinged to the second rotating column (201b).

8. The special tool for measuring loop resistance of a 10kV vacuum circuit breaker according to claim 7, characterized in that: The number of the handles (201) is two groups, and the two groups of handles (201) are symmetrically arranged on both sides of the fixing rod (101); The number of the connecting buckles (202) corresponds to the number of the handles (201); The handle (201) is rotated to push the movable rod (102) to move along the axial direction of the fixed rod (101).

9. The special tool for measuring loop resistance of a 10kV vacuum circuit breaker according to claim 8, characterized in that: The outer wall of the clamping portion (103b) is provided with two groups of connecting posts (105).

10. A method for using a special tool for measuring loop resistance of a 10kV vacuum circuit breaker, characterized in that: A special tool for measuring loop resistance of a 10kV vacuum circuit breaker comprising any one of claims 5 to 9; and S1: installing the guide column (104) at the end of the movable rod (102), and then connecting the voltage loop of the resistance detection device to the terminal (105) provided on the side wall of the guide column (104), and connecting the current loop to the terminal (105) provided on the side wall of the connecting portion (103a); S2: the end of the clamping portion (103b) is then placed inside the plum blossom contact, and the handle (201) is pulled so that the end of the clamping portion (103b) expands and presses the inner wall of the plum blossom contact, thereby detecting the degree of fatigue damage of the spring; S3: When the handle (201) is pulled, the movable rod (102) drives the guide column (104) to move, so that the end of the guide column (104) enters into the vacuum circuit breaker, thereby flexibly adjusting the measuring position of the guide column (104).

Images