A Fault Diagnosis Method for Mechanical State of High Voltage Circuit Breaker

Abstract

The invention relates to a high-voltage circuit breaker mechanical state fault diagnosis method. The method includes the following steps that: 1, a characteristic parameter matrix, a basic state transition coefficient and a circuit breaker mechanical state parameter are established respectively; 2, the above three fault analysis parameters are written into the online monitoring system of a circuit breaker of a certain type; and 3, primary fault diagnosis is performed on the circuit breaker through an equation that phin+1=beta*Xn+1<T>, if phin+1 is larger than 0 and is smaller than 0.5, the mechanical state of the circuit breaker is free of fault hidden risks, if phin+1 does not range from 0 to 0.5, the mechanical state of the circuit breaker has a fault hidden risk, when the fault hidden risk exists on the circuit breaker, the value of the mechanical state parameter is corrected to be 0 or 1 according to an actual mechanical state. The high-voltage circuit breaker mechanical state fault diagnosis method of the invention has the advantages of simple and fast calculation, small computation quantity and high accuracy.

Description

Technical field [0001] The invention relates to the technical field of high-voltage circuit breakers, in particular to a fault diagnosis method for the mechanical state of a high-voltage circuit breaker. Background technique [0002] Circuit breakers play a very important role in the power system and protect the power system. In all types of circuit breakers, accidents in the operating mechanism occupy a relatively high proportion. Statistics show that more than half of the maintenance costs of substations are used for overhauling high-voltage circuit breakers, and 10% of circuit breaker failures are caused by improper overhauls. Therefore, effective detection of the working status of high-voltage circuit breakers, avoiding the in-depth development of faults, and preventing the occurrence of malignant sudden masters is of great significance to ensuring the safe and reliable operation of the power grid. During the closing and opening of the high-voltage circuit breaker, any chang...

AI Technical Summary

Problems solved by technology

In practical application, it is affected by many aspects, including: first, it is difficult to establish an accurate mathematical model; second, there is a lack of full understanding and understanding of the uncertainty and time-varying nature of the system structure and parameters; third, interference and noise caused The accuracy of the fault diagnosis algorithm is not high, and it cannot meet the real-time and reliability requirements of the smart grid for the fault diagnosis of high-voltage circuit breakers.

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