Lightning Transient Performances Analysis of Substation Based on Complete Transmission Line Model of Power Network and Grounding Systems

摘要

The lightning transient performance of substation strongly decides the safe operation of substation. The traditional lightning transient analysis of substation simply regards the grounding grid of the substation and the grounding devices of transmission towers as resistances with constant values. A complete transmission line models are proposed in this paper to consider the actual transient process of power network and the grounding grid of the substation and the grounding devices of transmission towers. A loss transmission line model with time-variable parameters is proposed to calculate the transient characteristic of a grounding grid and grounding devices under lightning current in which the ionization phenomena around the ground conductors are also considered. The analyzed results show that the proposed method can provide more accurate results.