Simulation Research on Transmission Characteristics of Partial Discharge Signals in Cables Based on PSCAD

Abstract:
This paper first analyzes the structural parameters of the cable. Resistance, inductance, capacitance and conductance are the primary parameters of the cable. The characteristic impedance and propagation constant of the cable are derived from the primary parameters of the cable. Based on the uniform transmission line theory, the transmission law of the signal in the cable is studied. The attenuation constant α is determined by the series resistance and parallel conductance of the cable, which mainly affects the size of the signal, and the phase shift constant β is determined by the series inductance and parallel capacitance of the cable, which mainly affects the signal. Propagation velocity in the cable body. Finally, a three-phase cable model is established by PSCAD/EMTDC, and the transmission law of the signal in the transmission line is verified by analyzing the amplitude, frequency and pulse width of the transmission signal in the cable, and it has a high consistency.