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Proceedings of 131hInternational Conference on Dielectric Liquids ( ICDL 99 ), Nara, Japan, July 20-25, 1999
Analysis of Acoustic Emissions Caused by the Partial Discharge
in the Insulation Oil
T. Sakoda*, T. ita*, H. Nieda* and K. Ando**
*Department of Electrical Engineering, Kumamoto Institute of Technology, 4-22-1 Ikeda, Kumamoto 860-0082
**Center for Cooperative Research, Kyushu Institute of Technology, 1-1,Tobataku, Kitakyushu 804-0015
JAPAN
Abstract velocities of these elastic waves are different, a
calculation error in the location of the discharge
In order to diagnose the deterioration of position will be brought. By this reason, we have
insulation and evaluate its location in oil - filled pole been investigating characteristics of the detected AE
transformer, measurements of elastic waves brought signals for correct location.
by corona discharges in oil were performed based on In this study, the elastic waves caused by a
an acoustic emission (AE) technique. The detected single pulse corona in oil were measured and
signals in these measurements were analyzed by analyzed by a fast Fourier transform (FFT) technique
means of a fast Fourier transform (FFT) and their to understand theoretically the kinds and properties of
properties were discussed theoretically. It was detectable elastic Lamb waves.
found that the AE signals due to the Lamb waves of
symmetri
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