Application of high voltage gradient zinc oxide elements to SF/sub 6/ gas insulated surge arresters for 22 kV-765 kV power systems

Zinc oxide elements have been developed for the surge arrester elements. Basically, these zinc oxide elements are evaluated by the reference voltage V/sub N/mA. Newly developed high voltage gradient zinc oxide elements have about twice value V/sub N/mA/mm of normal zinc oxide elements. This paper describes the application of the high voltage gradient zinc oxide elements to SF/sub 6/ gas insulated tank type surge arresters for 22 kV-765 kV power systems.