The Transactions of the Korean Institute of Electrical Engineers C (대한전기학회논문지:전기물성ㆍ응용부문C)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Detection of Ultrasonic Characteristics of Oil Corona by Wide-Band AE Sensor

광대역 AE 센서에 의한 유중코로나의 초음파 특성

  • 김인식 (경일대 전기공학과) ;
  • 이상우 (영남대 전기전자공학부 박사과정 수료) ;
  • 이동인 (영남대 전기전자공학부) ;
  • 이광식 (영남대 전기전자공학부) ;
  • 김이국 (경일대 전기공학과)
  • Published : 2000.01.01
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Abstract

In this paper, using a wide-band AE sensor with the frequency range from 100[kHz] to 1.5[kHz], the frequency spectra of AE signals generated from the corona discharges of the needle-plane gap and from the partial discharges of an epoxy void were analyzed to determine the proper ultrasonic sensor with optimum frequency range according to the patterns of corona discharges. We also examined the propagation characteristics of AE signals in oil and the relationship between the magnitude of corona discharge and the magnitude of AE signals in peak-to-peak value under the application of 60[Hz] ac high-voltage. From these results, the main frequency spectra of AE signals emitted from the corona discharges of the needle-plane gap were about 130[kHz] by the fast fourier transform, but the main frequency spectra appeared to be 230[kHz] in the partial discharges of an epoxy void. The magnitude of AE signals was proportional to the magnitude of corona discharge and discharge current pulse with increasing the applied voltages.

Keywords

References

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