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유중방전 초음파 신호의 광학적 측정 및 wavelet 분석
이상훈(S.H. Lee),이현철(H.C. Lee),지승욱(S.W. Jee),김충년(Ch.N. Kim),송현직(H.J. Song),이광식(K.S. Lee) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
It is well known that a discharge in oil is the source of various physical phenomena Ultrasonic-wave detection is a useful method to the diagnosis of the transformer-insulation condition. Conventionally, ultrasonic waves are detected by Piezo- electric transducer, and we use optical method that has many advantages. In this paper, we constructed a Mach-Zehnder interferometer with optical fiber and investigated the principle of operation. Test arrangement is based on the needle-plane electrode system in oil and applied AC high voltage Ultrasonic waves wire detected and showed signal- analysis results with wavelet transform.
池昇昱(S. W. Jee),李春夏(C. H. Lee),金忠年(Ch. N. Kim),李廣植(K. S. Lee),沈光烈(K. Y. Sim) 대한전기학회 2006 전기학회논문지C Vol.55 No.2
Most of electric accidents are happened in the place where activities are frequent by common people who has low electric knowledge. Also, accidents are increased in the low voltage electric equipment. So, it is increased to spread the dispersion or non-utility power generation system. It means that ordinary times observation is required for electric equipments by common people. This paper is studied for the diagnosis method of electric equipment that common people can diagnose easily. Voltage is generally and exactly measured in the electric and electronic field. We suggest new analysis tools using only electric voltage. It is called the Time-Energy analysis. The Time-Energy analysis is as following First, divide measured voltage waves into same parts, Second, conducted FFT(Fast Fourier Transform) transform for each divided period, Finally, each results are reassembled after graphic treatment. We compared Time-Energy analysis with discharge form by tracking tester. As the result, tracking discharge processes distinguished clearly.