Abstract
This paper discusses the possibility of using line surge arresters (LSAs) for the reduction of switching overvoltages (SOVs) on voltage uprated transmission lines. The method for the selection of LSA energy class and determination of optimum installation locations was proposed. The method was applied in case of improving the overvoltage protection of the transmission line uprated from 220kV to 400kV.The possibility of compacting a 400kV transmission line by installing LSAs was considered. Since a risk of flashover increases due to the reduction of insulation clearances, an algorithm that estimates the risk of flashover was developed and applied in case of compacting a 400kV transmission line.
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