Circuit breaker with online over-travel monitoring function and monitoring method thereof

Abstract

The invention discloses a circuit breaker with an online over-travel monitoring function and a monitoring method thereof. The circuit breaker comprises a monitoring device (1) arranged on an insulating tension pole of a high-voltage vacuum circuit breaker, and the monitoring device (1) carries out data exchange with a control device (2) in a wireless transmission mode; the control device (2) is used for receiving data from the monitoring device (1), displaying a monitored over-travel on a display screen, and comparing the monitored over-travel with a preset numerical value. The monitoring method comprises the following steps that: the monitoring device (1) transmits a monitored over-travel signal to the control device (2) by a wireless transmission circuit (5); then, after the monitored over-travel signal is demodulated by a control processor, the obtained signal is displayed by a display circuit (7), or an alarm signal is sent out by an alarm control loop (8). The circuit breaker with the special structure can be used for detecting the over-travel of a vacuum circuit breaker in real time, thereby timely avoiding problems caused by the undersized over-travel of the vacuum circuit breaker, and reducing the loss.

Description

technical field [0001] The invention relates to a high-voltage switch device in a power system, in particular to a circuit breaker with an over-travel online monitoring function and a monitoring method thereof. Background technique [0002] Due to its unparalleled advantages, vacuum circuit breakers have been widely used in the medium voltage field of power transmission and transformation grids. Their reliability depends largely on the reliability of the mechanical operating mechanism, and overtravel is a very important factor. Mechanical characteristic parameters. Overtravel is the distance that the moving or static contacts can move after the vacuum switch contacts are completely closed. The functions of overtravel mainly include the following points: 1. Ensure that the contact can still maintain a certain contact pressure after electrical wear; 2. When the contact is closed, it can use the spring force of the contact to buffer and reduce the bounce; 3. In the contact Wh...

AI Technical Summary

Problems solved by technology

[0003] If the overtravel is too small, the proper contact pressure of the contact after burning cannot be guaranteed, which may cause the circuit breaker to fail to work normally; at the same time, the initial opening speed becomes smaller, which will affect the opening and closing of the vacuum switch And dynamic and thermal stability, even reclosing spring vibration

If the overtravel is too large, the closing work of the operating mechanism will be increased, making closing extremely unreliable

Images