Grounding Reliability of 110kV Shared Tower under Lightning

Abstract:
In order to obtain the electromagnetic transient characteristics of the shared tower under lightning strike and the influence of different grounding schemes on the grounding reliability of the shared tower, a 110 kV shared tower model under lightning strike is established, and the transient potential and current distribution of the tower top and the grounding body are calculated. Finally, the influence of grounding type on the grounding reliability of the tower is analyzed from the perspective of ground potential rise balance and tower lightning protection performance. The results show that before and after the tower sharing, the lightning overvoltage amplitude deviation at the top of the tower and the cross arm position is small, which will not affect the lightning protection performance of the tower. When the base station network is equip potential connected to the tower network, the ground potential rise is significantly reduced and the potential balance is improved. The research results provide guidance and reference for the grounding scheme of shared tower.