Fault type diagnosis method and system for circuit breaker

Abstract

The invention discloses a fault type diagnosis method of a circuit breaker, comprising: monitoring the opening command and the closing command in real time; if the closing command is valid, recording the forced vibration signal and the free vibration signal when the circuit breaker to be tested is closed, and when When the free vibration signal is less than the preset threshold when closing, return to continue monitoring the opening command and closing command; if the opening command is valid, record the forced vibration signal and free vibration signal when the circuit breaker to be tested is opened, and free When the vibration signal is less than the preset threshold, return to continue monitoring the opening command and closing command; the forced vibration signal and free vibration signal when the circuit breaker is closed and the forced vibration signal and free vibration signal when the circuit breaker is opened, and The pre-stored vibration signals of the circuit breaker under normal state and various fault states are compared, so as to diagnose the fault type of the circuit breaker under test in real time. The invention also provides a fault type diagnosis system of the circuit breaker. The invention has high diagnosis efficiency and high accuracy rate.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a fault type diagnosis method and system for a circuit breaker. Background technique [0002] The current fault detection of circuit breakers adopts planned preventive maintenance, which is blind, time-consuming and laborious, and will bring many unnecessary shutdowns, and frequent operations and excessive disassembly and maintenance will reduce the reliability of circuit breakers. Therefore, how to effectively monitor the working status of the circuit breaker, find out the fault of the circuit breaker in time, deal with the defective parts in advance, avoid the vicious development of the circuit breaker fault, and prevent the occurrence of vicious accidents such as the explosion of the circuit breaker. Safe and reliable operation is of great significance. With the continuous improvement of the economic requirements of the power system, the planned maintenance can no lon...

AI Technical Summary

Problems solved by technology

However, the vibration of the circuit breaker is affected by various excitation sources inside the circuit breaker, which makes the vibration response of the circuit breaker extremely complex. If the closing or the energy release process of the closing mechanism during the operation of the circuit breaker is ignored, although the excitation source and Vibration response signal, but some fault types of closing and opening mechanisms will not be monitored by the fault diagnosis system. If the vibration signal of the circuit breaker is collected indiscriminately, it will increase the difficulty of extracting the fault characteristics of the vibration signal. In some cases, the fault characteristics are easily covered by interference signals. Therefore, it is necessary to improve the current fault diagnosis method using the circuit breaker operating vibration signal, so as to improve the diagnostic efficiency and accuracy of fault diagnosis, etc.

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