A High Efficient Time-domain Modeling Method for Partial Discharge Propagation in XLPE Cables with Large Length

Partial discharge (PD) detection is one of the most acceptable method for monitoring the cable insulation. The dispersion and attenuation caused by the PD propagation in cables greatly affect the localization and pattern recognition of PDs. In this paper, a time-domain modeling method of PD propagation in power cables that solves the problem of large amount of long cable modeling calculation is presented. The method is realized by establishing equivalent circuit of the cable and solving the corresponding state-equation. The equivalent circuit of per-unit-length is established by vector fitting analysis. The state-equation is solved by Runge-Kutta method. Three optimization algorithms are proposed to reduce the amount of computation. Finally, the process of a PD signal propagating in a 5 km cable is modeled and calculated as a simple.