Measurement on the permittivity and propagation velocity of used insulation oil at UHF Band using time domain reflectometry

TDR을 이용한 극초단파 대역에서 사용 절연유의 유전율과 전파속도 측정

  • 구선근 (한전 전력연구원 전력계통연구소) ;
  • 주형준 (한전 전력연구원 전력계통연구소) ;
  • 박기준 (한국 전력공사 전력연구원 전력계통연구소) ;
  • 한기선 (한전 전력연구원 전력계통연구소) ;
  • 윤진열 (한전 전력연구원)
  • Published : 2008.11.01

Abstract

We measured the permittivity and electromagnetic wave propagation velocity of used insulation oil with wide frequency range including ultra-high frequency by time domain reflectometry. The permittivity or propagation velocity is essential for locating discharge faults of oil filled power transformer. We derived 2.21 as a permittivity and $2.03{\times}10^8 m/s$ as a velocity from the measurement of pulse travelling time along a coaxial line filled with used insulation oil or air. The permittivity measurement system we designed shows high measurement accuracy and the convenience for field use.

Keywords

References

  1. 구선근 등. 'UHF 부분방전 상시감사시스템 실변전소 실증시험' 제 37회 대한전기학회 하계학술대회 초록집, APP-3, 용평, 2006
  2. B. F. Hampton & R. J. Meat, 'Diagnostic Measurements at UHF in Gas Insulated Substations', IEE Proc., Vol. 135, No. 2, p.141, 1988
  3. M. D. Judd, B. M. Pryor, S. C. Kelly & B. F. Hampton, 'Transformer Monitoring Using the UHF Technique', Proc. of ISH, Paper 5.362.P5, London, 1999
  4. K. Raja, F. Devauz & S. Lelaidier, 'Recogniton of Discharge Sources Using UHF PD Signatures', IEEE Electrical Insulation Magazine, Vol. 18, No.5, pp. 8-14, 2002
  5. 구선근, 주형준, 박기준, 한기선, 윤진열, 'TDR을 이용한 극초단파 대역에서 절연유 유전율 측정', 2008년 대한전기학회 전기물성응용부분회 합동 춘계학술대회 논문집, pp173-174, 대전, 2008
  6. A. Cataldo, L. Taricone, M. Vallone, F. Attividdimo & A. Trotta, 'Uncertainly Estimation in Simultaneous Measurements of Levels and Permittivities of Liquid Using TDR Technique', IEEE Transcations on Instrumentation and Measurement, Vol. 57, No. 3, pp 454-466, 2008 https://doi.org/10.1109/TIM.2007.911700
  7. Edgar Hund, 'Microwave Communication', p 10, McGraw-hill Book Company, 1982