Analysis for Insulating Degradation Characteristics with Aging Time for Oil-filled Transformers and/or Correlation between using Linear Regression Method

유입식 변압기의 열화시간에 따른 절연 열화특성 및 선형회귀법을 이용한 상관관계 분석

  • 이승민 (충남대학교 사범대학 전기전자통신 공학교육과)
  • Received : 2010.02.18
  • Accepted : 2010.03.15
  • Published : 2010.04.01


General transformer's life is known as paper insulation' life. If a transformer is degraded by these aging factors, it is known that electrical, mechanical and chemical characteristics for transformer's oil-paper are changed. When the kraft paper is aged, the cellulose polymer chains break down into shorter lengths. It causes decrease in both tensile strength and degree of polymerization of paper insulation. The paper breakdown is accompanied by an increase in the content of furanic compounds within the dielectric liquid. In this paper it is aimed at analysis on correlation between aging characteristics for insulating diagnosis of thermally aged paper. For investigating the accelerated aging process of oil-paper samples accelerating aging cell was manufactured for estimating variation of paper insulation during 500 hours at $140^{\circ}C$ temperature. To derive the results, it was performed analysis such as tensile strength(TS), depolymerization(DP), dielectric strength(DS), relative permittivity, water content(WC) and furan compound(FC) for aged paper. Also for analyzing correlation between insulating degradation characteristics, we used linear regression method. As as results of linear regression analysis, there was a close correlation between TS and DP. WC, FC. But dielectric strength was a weak correlation with aging time.


  1. 倉持龍ー, "電氣機器の豫防保全技術の現狀と動向", 電氣學會雜誌, 104卷 1號,昭59-1, pp.25-31.
  2. 곽희로, "변압기의 절연진단기술", 전기학회지 제45권, 4호, 1996.
  3. 선종호, 김광화, "유중가스분석에 의한 변압기 이상진 단법 기술동향", 대한전기학회 신기술동향 제52권 12호, pp.35-41, 2003.
  4. 한국전력, "765kV 변전기기 예방진단 시스템 개발 2차년도 보고서", 1999.
  5. 김재훈, 한상옥, "전력용 변압기의 열화에 의해 생성된 부산물의 분석", 대한전기학회논문지 56A권 9호, pp.1561-1555, 2007.
  6. 한국전기안전공사, "전력용 변압기의 점검기준에 관한 연구", pp.139-145 2000.
  7. 박현주, 김석분, "변압기 열화진단을 위한 절연유중 퓨란화합물 최적 분석기법 고찰", 대한전기학회 하계학술대회 논문집, pp.2047-2048, 2009.
  8. 노형진, "Excel 및 SPSS를 활용한 다변량분석 이론과 실제", 형설출판사, 2005.
  9. 한국전력, "주변압기 운영기준", 한국전력공사 송변처, pp.1-67, 2008.
  10. 최광범, "절연유중의 수분 및 Fufural 검출을 이용한 유입변압기 상태진단", 전기학회논문지, 54C권 12호, pp.546-552, 2005.