Hybrid algorithm for calculating cable current response in high-altitude electromagnetic pulse environment

The effect of the high-altitude nuclear explosion pulse on cable above ground is studied. Considering the effect of ground, Time Domain Integral Equation(TDIE) combined with reflection coefficient method are proposed to solve the transient current of the cable above ground. The time domain reflections of electromagnetic waves from half-space are obtained by eigenmodes method. The exact solution of time reflection coefficient could be obtained without calculating the infinite term of the Bessel function. Finally, the simulation results of the current induced by the cable above the ground are given. The results show that the reflection field always tries to cancel the incident field when the reflection pulse reaches the horizontal cable, the induced current on the cable is less than that only considering the incident pulse. The coupling current of the cable varies significantly with the height above ground, the overhead cable has a larger coupling current compared to the ground cable.