Research on calculation of mechanical parameters of circuit breaker and engineering application in on-line monitoring system

Abstract EN

Mechanical parameters are important contents of on-line monitoring system of high voltage circuit breaker(HVCB).

Among mechanical parameters, closing and opening moments are the most important ones, which are difficult to be acquainted in on-line systems.

In this paper, a novel method of the judgment of closing and opening moments is proposed by dealing with three phase displacement data based on signal processing technique.

According to the features of sampling signals, three steps are employed to capture the characteristic points of displacement curves: Firstly, interferences are eliminated through wavelet de-noising processing session.

Secondly, characteristics of three phase displacements are highlighted through wavelet decomposition and reconstruction procedure.

Lastly, closing moment, mostly adopted to calculate the mechanical parameters, is obtained through Hilbert transform.

This method is used to analyze and process displacement data of VMB5-12 HVCB with rated voltage 10kV.

The calculation results of experiments are much more precise.