Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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A Study on the Health Evaluation Method of Oil-immersed Transformer through Analysis of Insulating Oil

활선중 절연유 분석을 통한 유입변압기 건전성 평가 방법에 관한 연구

  • Youn-Jin Shin (Dept. of Safety and Environment Technology, Seoul National University of Science and Technology) ;
  • Jae-Yong Lim (Dept. of Safety and Environment Technology, Seoul National University of Science and Technology)
  • 신연진 (서울과학기술대학교 안전환경기술융합학과) ;
  • 임재용 (서울과학기술대학교 안전공학과)
  • Received : 2023.10.04
  • Accepted : 2023.11.22
  • Published : 2023.12.31
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Abstract

The health state of the oil transformer is evaluated by the age of use and the state of internal defects. Mineral Oil, used as an insulator for oil transformers, creates specific gases and compounds through chemical reactions caused by heat, moisture, and partial discharge inside the transformer. It is possible to determine the aging and defect of the transformer through these gases and compounds. So, it is an important indicator to evaluate the health of a transformer. In this study, factors for assessing the health of transformers were hierarchically categorized, and key factors for each hierarchy were selected for design weighting. These weights were determined through surveys conducted with experts in the fields of transformer design, operation, and quality. For the health of a transformer, defect-related factors are approximately three times more important than factors related to aging. Additionally, defect-related factors showed a higher weighting for gases generated at high temperatures. Furthermore, Furan was determined to have a high weight, directly associated with insulating paper aging. Based on these findings, a health index was proposed, and a comparative analysis was conducted by categorizing 40 operational transformers into normal and comparison groups to evaluate and validate it.

Keywords

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