Online monitoring method and online monitoring device of high voltage vacuum circuit breaker

Abstract

Aiming at the condition that primary line current and voltage are not easily monitored by a sensor due to high voltage and large current when a high voltage circuit breaker works online, the invention provides an online monitoring method and an online monitoring device of a high voltage vacuum circuit breaker. The method comprises the steps of: using a displacement sensor directly connected with a moving contact of the high voltage circuit breaker to collect a stroke signal of the moving contact; calculating characteristic points on a stroke curve through a series of filtering and correction; and analyzing the characteristic points to calculate relevant parameters so as to judge the work condition of the circuit breaker online. The online monitoring method and device provided by the invention effectively monitor the high voltage circuit breaker online and can resist the monitoring environment of high voltage and large current. As the displacement sensor directly connected with the moving contact of the circuit breaker is just used as a unique signal collecting device in the invention, the problem of difficulty in implementation and high cost caused by the fact that high voltage resisting voltage or current sensors are needed to be used on a primary side line is solved.

Description

technical field [0001] The invention relates to a device capable of on-line monitoring of the working state of a high-voltage vacuum circuit breaker and an on-line monitoring method based on the device. Background technique [0002] A high-voltage circuit breaker is an electrical device that can break, close and carry normal current in the operating state, and can carry, close and break abnormal current (such as short-circuit current) within a specified time. Its working characteristic is that it changes from the conduction state to the insulation state instantaneously or from the insulation state to the conduction state instantaneously. In the power system, it is of practical significance to effectively use the control and protection functions of the high-voltage circuit breaker to ensure the safe and reliable operation of the power grid. Accidents caused by high-voltage circuit breakers account for more than 60% of the total in terms of number of times and blackout ti...

AI Technical Summary

Problems solved by technology

[0004] In view of the high voltage and high current when the high voltage circuit breaker is working online, it is difficult to use the sensor to monitor the current and voltage of the primary line, the present invention provides a high voltage vacuum circuit breaker online The monitoring device and the online monitoring method based on the device use a displacement sensor directly connected to the moving contact of the high-voltage circuit breaker to collect the stroke signal of the moving contact, and after a series of filtering and correction, calculate the characteristic points on the stroke curve, and pass Analyze these feature points to calculate relevant parameters, so that the working condition of the circuit breaker can be judged online

Images