A Study on the Detection of Acoustic Signal Produced by Partial Discharges in Insulation Oil and its Positioning

부분방전에 의한 음향신호의 검출과 위치추정에 관한 연구

  • 길경석 (한국해양대학교 전기전자공학부) ;
  • 박대원 (한국해양대학교 전기전자공학부) ;
  • 김일권 (한국해양대학교 전기전자공학부) ;
  • 최수연 (한국해양대학교 전기전자공학부) ;
  • 박찬용 (한국해양대학교 전기전자공학부)
  • Published : 2007.10.01


This paper dealt with the frequency spectrum analysis of acoustic signal produced by partial discharge (PD) in insulation oil and the positioning of PD occurrence to apply in diagnosis of oil insulated transformers. Three types of electrode system ; the needle-plane, the plane-plane, and the wire-wire structure were assembled to simulate partial discharges in oil insulated transformers. A low-noise amplifier and a decoupling circuit were designed to detect acoustic signal with high sensitivity The frequency spectrum of the acoustic signal were 50 kHz ${\sim}$ 260 kHz in the needle-plane, 50 kHz ${\sim}$ 250 kHz in the plane-plane, and 45 kHz${\sim}$195 kHz in the wire-wire electrode system. Their peak frequencies were 145 kHz, 130 kHz and 114 kHz, respectively The position of PD occurrence was calculated by the time difference of arrival (TOA) using three acoustic emission (AE) sensors, and we could find the position within the error of 1 % in the experimental apparatus.


  1. P. D. Agoris, S. Meijer, and J. J. Smit, 'Evaluation of On-line Insulation Condition Assessment Techniques for power transformers', International Symposium on High-Voltage Engineering(ISH), Beijing, China, 2005
  2. S. Tenbohlen, D. Uhde, J. Poittevin, U. Sundermann, H. Borsi, P. Werle, and H. Matthes, 'Enhanced Diagnosis of Power Transformers using On- and Off-line Methods: Results, Examples and Future Trends', CIGRE Paris, paper 12-204, 2000
  3. T. Leibfried and K. Feser, 'Off-line and On-line Monitoring of Power Transformers using the Transfer Function Methode', IEEE International Symposium on Electrical Insulation, Montreal, p. 34, 1996
  4. Th. Aschwanden, M. Hassig, and V. Der Houhanessoan, 'Development and Application of New Condition Assessment Methods for Power Transformers', CIGRE Paris, paper 12-207, 1998
  5. P. Guuinic and J. Aubin, 'Cigre's Work on Power Transformers', EPRI, Substation Equipment Diagnostics Conference IX, New Orleans, Louisiana, USA, 2001
  6. H. Kawada, M. Honda, T. inoue, and T. Amemiya, 'Partial discharges automatic monitor for oil-filled power transformer', IEEE Transaction on Power Apparatus and System, Vol. PAS-103, No. 6, p. 1045, 1986
  7. 권동진, 박재준, '변압기 부분방전 상시 감시기법에 관한 연구', 전기전자재료학회논문지, 14권, 12호, p. 1032, 2001
  8. Ghirelli. L., Koltunowicz. W., Pigini, A, Rama Prasath, S, and Yellaiah, A., 'Acoustical method for partial discharge detection in high power capacitors', Proceeding of International Conference on Partial Discharge, IEE, Canterbury, p. 92, 1993
  9. E. Howells and E. T. Norton, 'Detection of partial discharge in transformers using acoustic emission techniques', IEEE Transaction on Power Apparatus and System, Vol. PAS-97, No. 5, p. 1538, 1978
  10. P. M. Eleftherion, 'Acoustic emission-based PD source location in transformers', Electrical Insulation Magazine, IEEE, Vol. 11, Iss. 6, p. 22, 1995
  11. Y. Lu, X. Tan, and X. Hu, 'PD detection and localization by acoustic measurements in an oil-filled transformer', lEE Proceeding of Science Measurement Technology, Vol. 147, No. 2, 2000
  12. 길경석, 송재용, 서황동, 김용주, 강동식, 황돈하, '저압유도전동기에서 미소부분방전 측정에 관한 연구', 전기전자재료학회논문지, 18권, 10호, p. 960, 2005
  13. 권태호, 이종길, 이준호, '광섬유 센서를 이용한 절연유내의 부분방전 위치검출에 관한 연구', 전기전자재료학회논문지, 16권, 9호, p. 838, 2003