High-voltage circuit breaker mechanical state fault diagnosis method

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 high-voltage circuit breakers. Background technique [0002] The circuit breaker plays a very important role in the power system and plays a protective role in the power system. Among all kinds of circuit breakers, the accidents of the operating mechanism account for a relatively high proportion. Statistics show that more than half of the substation maintenance cost is used for the maintenance of high-voltage circuit breakers, and 10% of circuit breaker failures are caused by incorrect maintenance. Therefore, it is of great significance to effectively detect the working status of high-voltage circuit breakers, avoid the deep development of faults, and prevent the occurrence of vicious emergencies to ensure the safe and reliable operation of the power grid. During the closing and opening operation of the h...

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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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