절연진단용 광섬유 센서의 초음파 검출특성

Ultrasonic-detection characteristics of optical-fiber sensor for insulation diagnosis

  • Lee, S.H. (Research Institute of Industrial Science & Technology(RIST)) ;
  • Sim, S.H. (Yeungnam University) ;
  • Lee, K.S. (Yeungnam University) ;
  • Kim, D.W. (Research Institute of Industrial Science & Technology(RIST))
  • 발행 : 2002.11.09

초록

It is well known that a discharge in oil is the source of various physical and chemical phenomena. One of them is ultra-sonic wave, and its detection is a useful method to the diagnosis of the transformer insulation condition. Conventionally, ultra-sonic waves are detected by Piezo-electric trans-ducer(PZT), 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 of the ultrasonic-detecting ability was performed for both of PZT and fiber-optic sensor. Discharge test arrangement is based on the needle-plane electrode system in oil and applied AC high voltage. Ultrasonic waves were detected and showed time-delay characteristics. We analyzed the data with frequency domain and wavelet transform.

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