Study of magnetic fields from different types of lightning faults on a multi-tower system

Models of one or several extremely simple transmission towers (pylons) are usually used for analyzing the influence of lightning strikes on power network. Models of more complex transmission towers with transmission lines, ground wires and even lightning channel are required. In this paper, first of all, the reason why one only focuses on the magnetic field at the observation points is briefly explained. Secondly, a method used to get the time-domain results from the frequency-domain results by Antenna Design Framework Electromagnetic Satellite (ADF-EMS) software is established and its validity is proved. Thirdly, the effects of the lightning channels with different geometries are discussed. Finally, this paper comes up with a complex multi-tower system under the following fault types of lightning strikes, 1) direct lightning strikes to the edge phase wire without flashover, 2) direct lightning strikes to the edge phase wire with flashover, 3) lightning strikes to the top of the tower without flashover, and 4) lightning strikes to the top of the tower with back flashover. The magnetic field waveforms from these fault types are very important for the follow-up activity to achieve the fault type identification of lightning strikes in the observation system automatically.