Transient Current and Dispersion Characteristics of Transmission Lines Subjected to Lightning Stroke at Different Locations

In order to study the lightning current diversion and potential distribution and diversion characteristics of grounding devices in different locations of transmission lines subjected to lightning strikes, a complete model of transmission line poles, towers and grounding devices is established, and the voltage and current on poles and towers and grounding devices subjected to lightning strikes under three different lightning strikes, namely lightning arresters, shielding wires and lightning strikes on the top of poles and towers, and lightning strikes on lines are analysed. The influence of different locations on the distribution of ground potential and the distribution of current density. The calculation results show that lightning strikes on conductors have the greatest impact on the safe operation of transmission lines. The voltage on the grounding device is the highest when lightning strikes the tower top. The decreasing rate of ground potential and current density decreases gradually with the distance from the lightning current injection point. The research results can provide references for the optimization design of transmission line tower grounding body and the reduction of impulse grounding resistance. When the field test is difficult to carry out, the research method selected in this paper can be used as an alternative analysis.