Insulation Coordination for UHV AC Systems based on Surge Arrester Application (CIGRE C4.306)

摘要

Different countries in the world are planning and realizing UHV AC systems with operatingvoltages of 1000kV and above. The research activities within previous CIGRE SC33 in thetopic of UHV transmission provided a good basis on overvoltages and air insulationperformance to make possible the basic design for both 1100kV and 1200kV highest voltageof a system.Since 1990's, metal oxide surge arresters have been applied to UHV substation design.Insulation coordination for UHV has changed to be based on these arresters throughoutsubstation and transmission line. Also, gas insulated switchgears (GIS, MTS) have beengenerally applied to UHV substation design.This paper describes the recent practice on insulation coordination for UHV AC systems ofItaly, Japan, China and India, taking the future task of CIGRE WG C4.306 (Insulationcoordination for UHV AC systems) into account.