GISの非標準雷インパルス振動波形に対する絶縁特性

-- フィールド過電圧波形評価法とその適用--

抄録

To improve GIS insulation specifications, it is important to recognize the insulation characteristics under oscillatory overvoltage waveforms occurring in the field. This paper describes evaluation of field overvoltage waveforms and its applications using experimental data of insulation characteristics for single-frequency oscillatory waveforms and double-frequency oscillatory waveforms. As a result, it was obtained that the evaluation method based on duration for which applied voltage is more than 80% of peak voltage. This evaluation method can estimate the insulation levels for field overvoltage waveforms at these for standard lightning impulse waveform. Furthermore, this method was applied to evaluation of filed overvoltage waveforms. It was obtained that this method is applicative and has higher precision than conventional method for evaluation under experimental conditions.