Theoretical Aproach for Impulse Arc Energy Estimation

An impulse energy causes a dissolved gas from an insulation oil when breakdown occurs during the impulse test. The paper proposes the estimation method of impulse arc energy into the insulation oil from the record of breakdown waveform with high frequency oscillation. Namely, an arc resistance was calculated by the resonant frequency and the decay time of high frequency oscillation waveform. Using this, theoretical value of the arc energy is derived by the electric circuit analysis.