Method and system for diagnosing fault type of breaker

Abstract

The invention discloses a method for diagnosing a fault type of a breaker. The method comprises the following steps: opening instructions and closing instructions are monitored in real time; if the closing instructions are valid, forced vibration signals and free vibration signals are recorded when the to-be-detected breaker is closed, when each free vibration signal is less than a preset threshold during closing, the opening instructions and the closing instructions are continuously monitored; if the opening instructions are valid, forced vibration signals and free vibration signals are recorded when the to-be-detected breaker is opened, when each free vibration signal is less than the preset threshold during opening, the opening instructions and the closing instructions are continuously monitored; forced vibration signals and free vibration signals occurred by closing and opening the to-be-detected breaker are compared with the vibration signals of the breaker under pre-stored normal states and multiple faults, so that the fault type of the to-be-detected breaker is in real time diagnosed. The invention further discloses a system for diagnosing the fault type of the breaker. The system is high in diagnosing efficiency and accuracy.

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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