CO_2ガスの非標準雷インパルス振動波形に対する絶縁特性 : CO_2ガスにおける非標準雷インパルス波形の評価法

概要

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SF6 gas is widely used in electric power apparatus such as gas insulated switchgears (GIS), because of its superior dielectric properties; however, it has been identified as a greenhouse gas at COP3 in 1997, alternative insulation gases to SF6 are recently investigated. The one of the candidates is CO2 gas, which has lower global warming potential (GWP). However CO2 gas has a lower withstand voltage level than SF6 gas; therefore, it is necessary to rationalize the equipment insulation level and reexamine the insulating test voltage for electric power apparatus as low as possible. From our previous investigation, in SF6 gas insulation system, it is obtained that the insulation requirements of the real surges (called non-standard lightning impulse waveform) are not as severe as those of the standard lightning impulse waveform. This paper describes the evaluation method for real surges, based on insulation characteristics of CO2 gas gaps. Furthermore, the method was applied to typical field overvoltage waveform in the lightning surge time region for 500kV systems and it is obtained that the equivalent peak value of the standard lightning impulse waveform is possibly reduced by 10 to 15 percents.
社団法人電気学会の論文
2006-07-01