Observation of a Shielding Failure to UHV Line

Abstract

Lightning strikes have been observed to study the lightning phenomena particular to a system in which both UHV designed and 500kV designed transmission lines coexist. This observation covers the lightning phenomena through lightning strikes, surge propagation on transmission lines and generation of overvoltages in substations. This paper describes the study of the lightning phenomenon of a shielding failure to a UHV designed line and the analysis result by the EMTP, which are based on the observation result of the lightning surge at a substation.