CN-121983457-A - Vacuum circuit breaker and mechanical property testing method thereof

CN121983457ACN 121983457 ACN121983457 ACN 121983457ACN-121983457-A

Abstract

The invention relates to the field of high-voltage switches, in particular to a vacuum circuit breaker and a mechanical characteristic testing method thereof. The vacuum arc-extinguishing chamber moving contact comprises a vacuum arc-extinguishing chamber moving contact, an electric connection, a moving support, a guide cylinder, an insulating pull rod and a contact spring assembly, wherein a guide channel is vertically distributed at the upper part of the moving support, the guide cylinder is arranged at the bottom end of the moving support, the vacuum arc-extinguishing chamber moving contact penetrates through the top end of the guide channel upwards, the electric connection is arranged at the periphery of the bottom end of the vacuum arc-extinguishing chamber moving contact, the contact spring assembly comprises a connecting rod arranged at the bottom end of the vacuum arc-extinguishing chamber moving contact, a trigger assembly arranged on the guide cylinder in a sliding manner and a contact spring connected between the trigger assembly and the connecting rod, the upper part of the trigger assembly is unlocked with the connecting rod when extending into the guide channel upwards, and the upper part of the trigger assembly is interlocked with the connecting rod when moving out of the guide channel downwards. The invention can avoid influencing the service life of key parts of the vacuum circuit breaker due to the brake opening overshoot. The mechanical characteristic test method can truly reflect the motion state of the moving contact of the vacuum arc-extinguishing chamber.

Inventors

ZHANG JIARUI
JIA ZONGQING
ZHAO KE
SUN LEI
CONG MENG
ZHANG JIANLEI
LI XINING
XIAO PEIWEI
SU WEI
WANG GONGSHUAI
YU HONGXU
WANG MENG

Assignees

山东泰开高压开关有限公司
国网江苏省电力有限公司
国网江苏省电力有限公司电力科学研究院

Dates

Publication Date: 20260505
Application Date: 20251028

Claims (8)

1. A vacuum circuit breaker, comprising: The upper part of the movable support (3) is provided with a guide channel which is vertically distributed, and the bottom end of the movable support is provided with a guide cylinder (5); the moving contact (1) of the vacuum arc-extinguishing chamber penetrates out of the top end of the guide channel upwards; The electric connection (2) is arranged at the periphery of the bottom end of the movable contact (1) of the vacuum arc-extinguishing chamber and is arranged at the inner side of the guide channel in a sliding manner; The contact spring assembly (4) comprises a connecting rod (401) arranged at the bottom end of a moving contact (1) of the vacuum arc-extinguishing chamber, a trigger assembly arranged on the guide cylinder (5) in a sliding manner and a contact spring (404) connected between the trigger assembly and the connecting rod (401), wherein the upper part of the trigger assembly is unlocked with the connecting rod (401) when extending into the guide channel upwards, and is interlocked with the connecting rod (401) when moving out of the guide channel downwards; and the insulating pull rod (6) is arranged at the bottom end of the trigger assembly.
2. The vacuum circuit breaker according to claim 1, wherein the trigger assembly comprises an end cap (402) for the connecting rod (401) to slide vertically, a spring cylinder (403) provided at a bottom end of the end cap (402), and a linkage assembly for interlocking or unlocking the end cap (402) and the connecting rod (401).
3. The vacuum interrupter of claim 2 wherein the linkage assembly is radially symmetrically disposed about the connecting rod (401) in two sets, including a first spring (405), a first sliding pin (406), a second spring (407) and a second sliding pin (408), the connecting rod (401) having a radially outwardly disposed runner, the end cap (402) having a radially extending runner for sliding the first sliding pin (406), the runner for sliding the first sliding pin (406) and the second sliding pin (408), the second sliding pin (408) being located on an outer peripheral side of the first sliding pin (406), the first spring (405) being connected between the first sliding pin (406) and a bottom of the runner slot, the second spring (407) being connected between the second sliding pin (408) and the end cap (402).
4. A vacuum circuit breaker according to claim 3, characterized in that the outer top and bottom ends of the sliding shaft pin one (406) are provided with chamfers, the outer end of the sliding shaft pin two (408) is of a semi-spherical structure, and the movable support (3) is distributed in a flaring manner at the bottom end of the guide channel.
5. A vacuum circuit breaker according to claim 3, wherein the linkage assembly further comprises a limiting plate (409) arranged at the outer end of the slide way, the limiting ring (9) is provided with a through hole for the outer end of the sliding shaft pin two (408) to pass through, the outer periphery of the sliding shaft pin two (408) is provided with a convex ring part which is convex, and the limiting plate (409) limits the outer movement limit position of the sliding shaft pin two (408) through the convex ring part.
6. The vacuum circuit breaker according to claim 5, wherein the slideway of the end cover (402) comprises a slideway part I, a communicating part and a slideway part II which are communicated in sequence from outside to inside, the cross section of the communicating part is smaller than that of the slideway part I and the slideway part II, the convex ring part of the sliding shaft pin II (408) is arranged on the inner side of the slideway part I in a sliding way, and one end of the inner side of the sliding shaft pin II (408) penetrates through the communicating part and stretches into the slideway part II.
7. The vacuum circuit breaker according to claim 6, wherein the passive support (3) pushes inward when the sliding pin two (408) is extended upward into the guide channel, and pushes the sliding pin one (406) inward into the slide channel from being caught between the slide channel portion two and the slide channel, releasing the interlocking of the end cover (402) and the connecting rod (401), and the sliding pin two (408) is pushed outward by the spring two (407) when moved downward out of the guide channel, the spring one (405) pushes the sliding pin one (406) to be caught between the slide channel portion two and the slide channel, interlocking the end cover (402) and the connecting rod (401).
8. A method for testing mechanical characteristics of a vacuum circuit breaker according to claim 2, comprising the steps of: S1, arranging a linear displacement sensor (7) between an end cover (402) and an electric coupling (2); S2, setting the sampling frequency of the linear displacement sensor (7) to be the same as the sampling frequency of a sensor at a mechanism transmission case; and S3, accurately reflecting the motion state of the moving contact (1) of the vacuum arc-extinguishing chamber according to the difference between the sampling data sets of the two sensors.

Description

Vacuum circuit breaker and mechanical property testing method thereof Technical Field The invention relates to the field of high-voltage switches, in particular to a vacuum circuit breaker and a mechanical characteristic testing method thereof. Background The vacuum circuit breaker has the advantages of small volume, light weight, suitability for frequent operation and no maintenance for arc extinction, and wide application in power distribution networks. However, SF6 circuit breakers predominate in circuit breakers of 126kV and above. With the improvement of voltage class, the vacuum interrupter moves the contact quality and promotes by a wide margin because of the reasons such as insulating, temperature rise, switching performance. After the mass of the moving contact of the vacuum arc-extinguishing chamber is increased, the moving contact and the operating mechanism are inconsistent when the breaker is opened. The vacuum circuit breaker is characterized in that a contact spring is arranged between a moving contact of a vacuum arc-extinguishing chamber and an operating mechanism, and the vacuum circuit breaker is required to achieve a certain speed and then decelerate and stop in order to meet the requirement of opening and closing when opening the switch. When the mechanism is opened and decelerated or stopped, the moving contact overcomes the elasticity of the contact spring under the action of kinetic energy, and continuously compresses the contact spring to cause abnormal overshoot, collision and rebound, thereby affecting the breaking performance of the vacuum circuit breaker and the service life of key parts. In addition, the conventional test method for the mechanical characteristics of the vacuum circuit breaker is to install a sensor at a mechanism transmission box, and for the reasons, the action between a moving contact of the vacuum arc-extinguishing chamber and an operating mechanism is inconsistent, and the detection result of the conventional sensor cannot truly reflect the movement state of the moving contact of the vacuum arc-extinguishing chamber. Disclosure of Invention The invention aims to solve the problems in the background technology and provides a vacuum circuit breaker and a mechanical characteristic testing method thereof, which can avoid influencing the service life of key parts of the vacuum circuit breaker due to opening overshoot. The mechanical characteristic test method can truly reflect the motion state of the moving contact of the vacuum arc-extinguishing chamber. On one hand, the invention provides a vacuum circuit breaker, which comprises a vacuum arc-extinguishing chamber moving contact, an electric connection, a moving support, a guide cylinder, an insulating pull rod and a contact spring assembly, wherein a guide channel is vertically distributed at the upper part of the moving support, the guide cylinder is arranged at the bottom end of the moving support, the vacuum arc-extinguishing chamber moving contact penetrates through the top end of the guide channel upwards, the electric connection is arranged at the periphery of the bottom end of the vacuum arc-extinguishing chamber moving contact and is arranged at the inner side of the guide channel in a sliding manner, the contact spring assembly comprises a connecting rod arranged at the bottom end of the vacuum arc-extinguishing chamber moving contact, a trigger assembly arranged on the guide cylinder in a sliding manner and a contact spring connected between the trigger assembly and the connecting rod, the upper part of the trigger assembly is unlocked with the connecting rod when extending into the guide channel upwards, the upper part of the trigger assembly is interlocked with the connecting rod when moving out of the guide channel downwards, and the insulating pull rod is arranged at the bottom end of the trigger assembly. Preferably, the trigger assembly comprises an end cap for the vertical sliding of the connecting rod, a spring barrel arranged at the bottom end of the end cap, and a linkage assembly for interlocking or releasing the end cap and the connecting rod. Preferably, the linkage assembly is symmetrically arranged in the radial direction about the connecting rod and comprises a first spring, a first sliding shaft pin, a second spring and a second sliding shaft pin, the connecting rod is provided with a sliding groove which is distributed outwards in the radial direction, the end cover is provided with a sliding way which is penetrated in the radial direction, the sliding groove is used for sliding the first sliding shaft pin and the second sliding shaft pin, the second sliding shaft pin is positioned on the outer peripheral side of the first sliding shaft pin, the first spring is connected between the first sliding shaft pin and the bottom of the sliding groove, and the second spring is connected between the second sliding shaft pin and the end cover. Preferably, the outer top and bottom ends of the