Frequency Domain Analysis of Transient Interference

According to the real situation of severe transient disturbance , also easily causing equipment malfunction in the substation. The study analyzed the mechanism and features of transient disturbances in the substation, and drew the typical waveforms. Next, the EFT interference sources been imposed on the test device, experimental data was obtained by the digital oscilloscope. According to a single EFT / B double-exponential waveform, frequency domain analysis was done. By double-exponential model of a single EFT / B signal and experimental data, frequency-domain analysis was carried on. The simulation results and experimental results show that, EFT / B signal spectrum components is below of 100 M, focusing on 40M below. This results will provide reference and basis for EFT / B interference for shielding and rejecting, and provide guidance to analyze electrostatic discharge and lightning surge signal in the frequency-domain.