Sensing of transient high-frequency large pulse resistive current in lightning arrester under waveform capture
To address the issue of lightning arrester transient high-frequency large pulse waveform perception being easily affected by interference signals and unable to obtain effective resistive current,a waveform capture based method for lightning arrester transient high-frequency large pulse resistive current perception is proposed.Based on the collected transient high-frequency large pulse resistive current of the lightning arrester,separate the weak resistive current from the capacitive current.Calculate the square of the fitting residual and use the least squares method to solve for the polynomial coefficients,so as to minimize the square of the fitting residual and capture the transient high-frequency large pulse waveform.Analyze the instantaneous high-frequency large pulse signal composed of fitting points,distinguish the discharge pulse and interference signal,and calculate the resistive current using the root mean square method.According to the experimental results,it can be seen that the perceived trend of resistive current by this method is consistent with the actual results.The maximum error between the current perception results and the actual data is 20 μA,which can accurately perceive resistive current.
waveform capturelightning arrestertransient high-frequencylarge pulseresistive current sensing
万方数据
维普
