A method for detecting circuit breaker tripping collisions

Abstract

This invention relates to a method for detecting circuit breaker tripping collisions. A signal triggering device is installed on a moving support. The position of the signal triggering device is adjusted so that when the internal connector of the circuit breaker collides with the moving contact, the top cap contacts the pressure cylinder. An end cover terminal is installed at the circuit breaker flange end cover. The inside of the end cover terminal is electrically connected to a spring via a trigger wire. The break line of a mechanical characteristic meter is electrically connected to the outside of the end cover terminal, and the grounding wire of the mechanical characteristic meter is electrically connected to the moving support terminal. During tripping, if the circuit formed by the break line, end cover terminal, trigger wire, spring, top cap, pressure cylinder, and moving support terminal is continuous, the mechanical characteristic meter displays a break, indicating a tripping collision. If the circuit is not continuous, the mechanical characteristic meter does not display a break, indicating no tripping collision. This detection method eliminates the need for disassembly and reassembly of the circuit breaker, significantly reducing workload and testing cycle.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, specifically to a method for detecting circuit breaker tripping collisions. Background Technology

[0002] High-voltage circuit breakers are key equipment in AC / DC power transmission systems. Most high-voltage circuit breakers have a tripping buffer, which is designed to absorb the residual energy of the circuit breaker's tripping spring when the circuit breaker is fully open. If the buffer is not properly adjusted, it will cause the internal joints of the circuit breaker to collide with the moving contact seat. With repeated collisions, this will damage the components and cause the circuit breaker to malfunction.

[0003] Existing methods for detecting collisions during circuit breaker tripping include: 1. Using sensors on a mechanical characteristic instrument to collect the circuit breaker's characteristic curve and observing the overshoot value to determine if a collision has occurred. However, the sensors are located outside the circuit breaker and the signals are collected after passing through the movement of components such as the insulating rod and crank arm. This cannot eliminate the influence of buckling deformation of the insulating rod during overshoot, pin hole clearance, and component errors, resulting in significant errors. 2. Disassembling the circuit breaker after a certain number of trips to check for collision marks. However, each disassembly requires the following steps: cleaning or marking the collision surface, reassembly, vacuuming, gas filling, characteristic adjustment, a certain number of trips, gas recovery, and disassembly inspection. These steps are quite cumbersome, especially during the repeated debugging of different buffering effects in new product development, which is time-consuming and labor-intensive. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for detecting circuit breaker tripping collisions.

[0005] This invention is achieved through the following technical solution, providing a method for detecting circuit breaker tripping collisions, comprising the following steps:

[0006] a. Install the signal triggering device on the moving support. The signal triggering device includes an insulating jacket fixed on the moving support and a top cap with one end inserted into the insulating jacket. A plug is fixed inside the insulating jacket. A spring is installed between the plug and the top cap. The spring and the top cap are electrically connected. The other end of the top cap extends out of the insulating jacket and is adapted to the air cylinder.

[0007] b. Adjust the position of the signal triggering device so that when the connector inside the circuit breaker collides with the moving contact seat, the top cap contacts the air cylinder;

[0008] c. Install end cover terminals at the circuit breaker flange end cover. The inside of the end cover terminals is electrically connected to the spring via a trigger wire. The break wire of the mechanical characteristic instrument is electrically connected to the outside of the end cover terminals. The ground wire of the mechanical characteristic instrument is electrically connected to the moving support terminals.

[0009] d. When operating the mechanical characteristic instrument, if the circuit formed by the break line, end cover terminal, trigger wire, spring, top cap, pressure cylinder and moving support terminal is continuous during the opening, the mechanical characteristic instrument will display a break, indicating that a breaking collision has occurred; if the circuit is not continuous, the mechanical characteristic instrument will not display a break, indicating that there was no breaking collision during the opening.

[0010] As an optimization, the number of breaks displayed by the mechanical characteristic instrument can be used to determine the number of impact oscillations. Since impact oscillations are generated when the internal connectors of the circuit breaker collide with the moving contact seat, the number of breaks can roughly determine the number of impact oscillations, which can reflect the strength of the collision to some extent.

[0011] As an optimization, the collision distance can be determined by the fracture length displayed by the mechanical characteristic instrument. Since the connector inside the circuit breaker will deform to a certain extent when it collides with the moving contact, there will be a certain impact time. The distance of deformation after the collision can be determined by the fracture length, which can reflect the strength of the collision to a certain extent.

[0012] As an optimization, the movable support has a threaded through hole on its end face facing the pressure cylinder, and the insulating sleeve is threaded into the threaded through hole. In this design, the insulating sleeve is threaded into the threaded through hole, so the distance between the top cap and the pressure cylinder can be adjusted by rotating the insulating sleeve.

[0013] As an optimization, the plug is threaded inside the insulating jacket. In this design, the plug is threaded inside the insulating jacket, which facilitates spring installation and allows for adjustment of the spring's clamping force.

[0014] As an optimization, the plug has a through hole to allow a trigger wire to pass through. The through hole in this design is used to trigger the wire to pass through.

[0015] As an optimization, the inner hole of the insulating jacket is a stepped hole, and the top cap is a stepped shaft. The large-diameter end of the top cap is disposed inside the large-diameter hole of the insulating jacket, and the small-diameter end of the top cap protrudes from the small-diameter hole of the insulating jacket. In this design, the inner hole of the insulating jacket is a stepped hole, and the top cap is a stepped shaft, thereby preventing the top cap from coming out of the insulating jacket.

[0016] The beneficial effects of the present invention are as follows: The method for detecting circuit breaker tripping collision of the present invention realizes the detection of collision between the internal joint and the moving contact seat of the circuit breaker through a mechanical characteristic instrument and a signal triggering device. The circuit breaker does not need to be disassembled and assembled, and the collision of the circuit breaker can be detected, which greatly reduces the workload and test cycle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation of the present invention;

[0018] Figure 2 This is a partially enlarged view of the present invention;

[0019] Figure 3 This is a schematic diagram showing the installation position of the signal triggering device of the present invention;

[0020] Figure 4 This is a schematic diagram of the signal triggering device of the present invention;

[0021] Figure 5 This is a diagram showing the mechanical characteristics of the circuit breaker during a tripping collision according to the present invention.

[0022] Figure 6 This is a display diagram of the mechanical characteristics of the circuit breaker during collision-free tripping according to the present invention;

[0023] As shown in the figure:

[0024] 1. Top cap; 2. Insulating jacket; 3. Spring; 4. Plug; 5. Trigger wire; 6. Moving support; 7. Connector; 8. Moving contact seat; 9. Air cylinder; 10. End cap terminal block; 11. Break wire; 12. Mechanical characteristic instrument; 13. Grounding wire; 14. Moving support terminal block. Detailed Implementation

[0025] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0026] like Figure 1 As shown, the connector 7 is fixed on the movable contact seat 8, and the front end of the movable contact seat 8 is also fixedly connected to a pressure cylinder 9 that is sleeved outside the movable contact seat 8.

[0027] like Figures 1-6 As shown, a method for detecting circuit breaker tripping collision according to the present invention includes the following steps:

[0028] a. Install the signal triggering device on the moving support 6.

[0029] The signal triggering device includes an insulating sleeve 2 fixed on a movable support 6 and a top cap 1 inserted into the insulating sleeve 2 at one end. The insulating sleeve 2 is a circular sleeve, and the top cap 1 is a circular shaft. The inner hole of the insulating sleeve 2 is a stepped hole, and the top cap 1 is a stepped shaft. The large-diameter end of the top cap 1 is set in the large-diameter hole of the insulating sleeve 2, and the small-diameter end of the top cap 1 passes through the small-diameter hole of the insulating sleeve 2, thereby preventing the top cap 1 from falling out.

[0030] The outer sleeve 2 is made of insulating material and has threads on the outside. The end face of the moving support 6 facing the air cylinder 9 has a threaded through hole, and the insulating outer sleeve 2 is threaded into the threaded through hole.

[0031] A plug 4 is fixed inside the insulating jacket 2. The plug 4 is made of insulating material and has external threads on its outer circumference, thus being threadedly connected inside the insulating jacket 2.

[0032] A spring 3 is installed between the plug 4 and the top cap 1. Both the top cap 1 and the spring 3 are made of conductive materials. The spring 3 and the top cap 1 are electrically connected. The other end of the top cap 1 extends out of the insulating jacket 2 and is adapted to the air cylinder 9. The air cylinder moves towards the top cap 1 when the circuit is opened.

[0033] b. Adjust the position of the signal triggering device so that when the connector 7 inside the circuit breaker collides with the moving contact seat 8, the top cap 1 contacts the air cylinder 9.

[0034] c. Install end cover terminal 10 at the flange end cover of the circuit breaker. End cover terminal 10 is insulated from the housing and other components. The inside of end cover terminal 10 is electrically connected to spring 3 through trigger wire 5. The plug 4 has a through hole for trigger wire 5 to pass through.

[0035] The break wire 11 of the mechanical characteristic instrument 12 is electrically connected to the outside of the end cover terminal 10, and the ground wire 13 of the mechanical characteristic instrument is electrically connected to the moving support terminal 14.

[0036] d. When operating the mechanical characteristic instrument, if the circuit formed by the break line 11, end cover terminal 10, trigger wire 5, spring 3, top cap 1, air cylinder 9 and moving support terminal 14 is continuous during the tripping operation, the mechanical characteristic instrument will display a break, proving that a tripping collision has occurred. Figure 5 The protrusion on the upper horizontal line is the break.

[0037] If the circuit is not conductive, the mechanical characteristic instrument will not show a break, proving that there was no collision when the circuit breaker was tripped.

[0038] The number of breaks displayed by the mechanical characteristic instrument can indicate the number of impact oscillations. Since impact oscillations are generated when the internal connectors of the circuit breaker collide with the moving contact seat, the number of breaks can roughly indicate the number of impact oscillations, which can reflect the strength of the collision to some extent.

[0039] The collision distance can be determined by the fracture length displayed by the mechanical characteristic instrument. Since the internal connectors of the circuit breaker will deform to a certain extent when they collide with the moving contact seat, there is a certain impact time. The fracture length can be used to determine the distance of deformation after the collision, which can reflect the strength of the collision to a certain extent.

[0040] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A method for detecting circuit breaker tripping collisions, characterized in that, Includes the following steps: a. Install the signal triggering device on the moving support (6). The signal triggering device includes an insulating jacket (2) fixed on the moving support (6) and a top cap (1) inserted into the insulating jacket (2) at one end. A plug (4) is fixed inside the insulating jacket (2). A spring (3) is installed between the plug (4) and the top cap (1). The spring (3) and the top cap (1) are electrically connected. The other end of the top cap (1) extends out of the insulating jacket (2) and is adapted to the air cylinder (9). b. Adjust the position of the signal triggering device so that when the connector (7) inside the circuit breaker collides with the moving contact seat (8), the top cap (1) contacts the air cylinder (9); c. Install end cover terminal (10) at the end cover of the circuit breaker flange. The inside of the end cover terminal (10) is electrically connected to the spring (3) through the trigger wire (5). The break wire (11) of the mechanical characteristic instrument (12) is electrically connected to the outside of the end cover terminal (10). The ground wire (13) of the mechanical characteristic instrument is electrically connected to the moving support terminal (14). d. When operating the mechanical characteristic instrument, if the circuit formed by the break line (11), end cover terminal (10), trigger wire (5), spring (3), top cap (1), air cylinder (9) and moving support terminal (14) is continuous, the mechanical characteristic instrument will show the break, proving that a circuit breaking collision has occurred; if the circuit is not continuous, the mechanical characteristic instrument will not show the break, proving that there is no circuit breaking collision.

2. The method for detecting circuit breaker tripping collisions according to claim 1, characterized in that: The number of fractures can be determined by displaying the number of fractures on a mechanical property analyzer, which indicates the number of oscillations during the collision.

3. The method for detecting circuit breaker tripping collisions according to claim 1, characterized in that: The collision distance can be determined by the fracture length displayed by the mechanical properties tester.

4. The method for detecting circuit breaker tripping collisions according to claim 1, characterized in that: The moving support (6) has a threaded through hole on its end face facing the air cylinder (9), and the insulating jacket (2) is threaded into the threaded through hole.

5. The method for detecting circuit breaker tripping collisions according to claim 1, characterized in that: The plug (4) is threaded into the insulating jacket (2).

6. The method for detecting circuit breaker tripping collisions according to claim 1, characterized in that: The plug (4) has a through hole for the trigger wire (5) to pass through.

7. The method for detecting circuit breaker tripping collisions according to claim 1, characterized in that: The inner hole of the insulating jacket (2) is a stepped hole, the top cap (1) is a stepped shaft, the large diameter end of the top cap (1) is set in the large diameter hole of the insulating jacket (2), and the small diameter end of the top cap (1) passes through the small diameter hole of the insulating jacket (2).

Images