Studies on Acoustic Emission Signals Detected in an Oil-immersed Pole Transformer
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概要
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Acoustic emission (AE) waves owing to partial discharges (PDs) in a 6 kV-oil-immersed pole transformer are influenced by windings, a magnetic core, and insulating paper because the AE waves proceed in all directions. To evaluate the amount of electrical charge due to a PD from AE signals detected by piezoelectric AE sensors, characteristics of AE signals obtained by arranging AE sensors at various positions were evaluated. We also investigated that the intensity ratio of frequency components of a detected AE signal was useful for estimating the rough location of a PD.
著者
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NAKASHIMA Toshihiko
Department of Neurosurgery, Gifu Prefectural General Medical Center
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YAMAMOTO Takuya
Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
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Sakoda Tatsuya
Department Of Electrical System And Computer Engineering Sojo University
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OTSUBO Masahisa
Department of Electrical and Electronic Engineering, University of Miyazaki
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Kurihara Satoshi
Miyazaki Branch Kyushu Electric Power Co., Inc.
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Nagasato Shinya
Miyazaki Branch Kyushu Electric Power Co., Inc.
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Yarimitsu Takayoshi
Miyazaki Branch Kyushu Electric Power Co., Inc.
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