To eliminate the jitter at the very on and off points of high voltage breakers caused by mechanical vibration and EMI in their stroke displacement monitoring

a stroke displacement data fitting and processing algorithm based on least square method is presented. The derivative criterion of the original data of online monitoring is adopted to eliminate the corresponding interference and perform first data fitting

then the fitted data and the original data are compared to exclude a certain number of interference data for second fitting. And record waveform processing and calculation of mechanical parameters of the fitted data are conducted. Practical verification indicates that the proposed algorithm can effectively eliminate the interference points of displacement data and reflect real circuit breaker displacement curve

so as to accurately calculate the key parameters such as circuit breaker stroke displacement

switching speed

switching time

and so on

showing its effectiveness and applicability.