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운전중인 몰드형 전력변압기의 음향방출신호에 대한 주파수 스펙트럼 특성
구경철(Kyung-Chul Cu),이상우(Sang-Woo Lee),이동인(Dong-In Lee),이광식(Kwang-Sik Lee),김인식(In-Sik Kim),김이국(Lee-Kook Kim),신용철(Yong-Chul Shin) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-
In this paper, Frequency spectra of AE(acoustic emission) signals generated from the magnetizing and the load currents in the actual operating cast-resin power transformer of 500[kVA] under distribution system of 22.9[㎸] were also analysed to distinguish the AE signals due to void discharges from the magnetic circuit noises in the core of cast-resin power transformer. As the experimental results, we could distinguish the AE signals whether those signals were caused due to the void discharges or due to the magnetic circuit noises by analyzing the frequency spectrum of AE signals. Frequency spectra of AE signals generated from the cast-resin power transformer in operation due to both the magnetizing and the load currents appeared in the range of 40-120[㎑].