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침 - 평판 전극 구조에서 발생하는 기중 코로나 방전의 해석 기법
박영구,권순석,강성화,정수현,류부형,임기조 한국산업안전학회 1996 한국안전학회지 Vol.11 No.4
Corona discharges in air insulated electric power systems cause power loss, produce interfering electromagnetic radiation, and can indicate incipient failure. An understanding of corona discharges in air gap is clearly important. The Wavelet transformation is an extended method of fourier transformation. The fourier method is a powerful tool for signal analysis, but it can't include information for time. However the wavelet transformation analysis can include on the information of time and frequencies at the same time. In this paper we apply the wavelet transformation to the corona signals in needle-plane air gap for the purpose of analysis of developing aspects of corona discharges. We analyzed the developing aspects of corona discharges, namely, corona discharge current, repetition rates, width of pulse distribution region, pulseless region and frequencies distribution of corona discharge pulses.