Development and application effect of polymeric surge ZnO arresters for 500 kV compact transmission line

500 kV polymeric ZnO surge arresters for a compact transmission line against lightning were developed and have been put into operation. The design of the arrester unit and the series gap are discussed. The calculated results states that the line surge arrester can highly improve the lightning withstand level of compact transmission line, and the line arrester can withstand the effects of lighting.