Investigation on Probabilistic Distribution of Wiring Harness Radiated Immunity of Power Transmission Line

Based on the nodal admittance method which is convenient to analyze the responses at terminals of multiconductor transmission lines excited by EM field, Monte Carlo method for the characterization of wiring-harness susceptibility to external interference is applied. The problems of field-coupling onto high voltage alternate current (HVAC) transmission line and high voltage direct current (HVDC) transmission line loaded by terminal resistances are considered. The external field is modeled by a uniform plane wave with random parameters. Investigated configuration is wave with three random parameters of polarization angle, incident angle and azimuth angle, and the set of random values is generated by computer. The formulas of response of multiconductor line are applied, and the amplitude of voltages or current is computed for every set of random values. When the range of incident parameters of wave is of [0,pi/2], the probability distributions of terminal currents and voltages are investigated.