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Temporary Overvoltage (TOV) Discharge Capability of Surge Arresters for 1,000kV Power System Yasuhiko Nakada, Member, (Tokyo Electric Power Co.), Seiichi Yamada, Kazuya Oishi, Shingo Shirakawa, Member (HITACHI, Ltd.) Insulation Level (LIWV 2,250kV) of 1,000kV gas insulated switchgear will be adopted by installing high performance 1,000kV surge arresters. But, when Temporary OverVoltage (TOV) is generated in power systems at line faults and load rejection including Ferranti effects, high performance surge arresters flow discharge current according to the value of TOV. Therefore, it is important to checkTOV discharge capability of surge arresters. This paper describes the screening of zinc oxide elements using of thermography (thermal uniformity factor) obtained by an infrared radiation camera, discharge capability of surge arresters for 1,000kV power system.

Temporary Overvoltage (TOV) Discharge Capability of Surge Arresters for 1, 000kV Power System