Coupling effects of LEMP on aerial multiconductor power lines

Based on the transmission line model, this paper proposes a method that integrates the lightning return stroke channel, the earth and the overhead lines together for calculating the lightning-induced voltages on overhead lines. The finite-difference time-domain (FDTD) method is used to obtain the electromagnetic field values near a cloud-to-ground lightning return stroke channel, and then these field values are put into the discretized transmission line equations to calculate the induced voltage at the end of overhead lines. Analyses show that the induced voltage on one conductor of the multi-conductor loaded lines is affected by the presence of other lines, and the voltages induced on each of the line conductors are generally 10%～20% lower than those corresponding to a single conductor l