Acoustic emissions caused by the corona discharge in an oil-tank

Author

Sakoda, T. ; Arita, Takaya ; Nieda, H. ; Otsubo, M. ; Honda, C. ; Ando, Kiyoini

Author_Institution

Dept. of Electr. Eng., Kumamoto Inst. of Technol., Japan

Volume

5

fYear

1999

fDate

1999

Firstpage

164

Abstract

Measurements of sonic and ultrasonic waves caused by corona discharges were performed based on an acoustic emission (AE) technique, to diagnose the deterioration of insulation and its location in an oil filled pole transformer. The detected signals in these measurements were analyzed by means of a fast Fourier transform (FFT) and their properties were discussed. It was found that the AE signals due to the Lamb waves caused in a thin steel tank can be easily recognized by the FFT analyses of initial stages of the detected AE signals. This indicates that the accuracy on location of the AE sources in the transformer can be improved. Also, it was shown that a low pass filter was effective to improve the accuracy of location

Keywords

power transformer insulation; Lamb waves; acoustic emissions; corona discharge; fast Fourier transform; insulation deterioration; low pass filter; oil filled pole transformer; oil-tank; signals analysis; sonic waves measurement; thin steel tank; ultrasonic waves measurement;

fLanguage

English

Publisher

iet

Conference_Titel

High Voltage Engineering, 1999. Eleventh International Symposium on (Conf. Publ. No. 467)

Conference_Location

London

ISSN

0537-9989

Print_ISBN

0-85296-719-5

Type

conf

DOI

10.1049/cp:19990911

Filename

818263