摘要：Mechanical parameters are important contents of on-line monitoring system of high voltagecircuit breaker(HVCB). Among mechanical parameters, closing and opening moments are themost important ones, which are difficult to be acquainted in on-line systems. In this paper, anovel method of the judgment of closing and opening moments is proposed by dealing with threephase displacement data based on signal processing technique. According to the features ofsampling signals, three steps are employed to capture the characteristic points of displacementcurves: Firstly, interferences are eliminated through wavelet de-noising processing session.Secondly, characteristics of three phase displacements are highlighted through waveletdecomposition and reconstruction procedure. Lastly, closing moment, mostly adopted tocalculate the mechanical parameters, is obtained through Hilbert transform. This method is usedto analyze and process displacement data of VMB5-12 HVCB with rated voltage 10kV. Thecalculation results of experiments are much more precise.
