Classification of Fault and Failure Types Determined by Dissolved Gas Analysis for Transformers

  • Yonghyun Kim
  • Dongjin Kweon
  • Taesik Park
  • Seonghwan Kim
  • Jang-Seob LimEmail author
Original Article


In this study, the locations of fault and failure that can be visually identified during internal inspection are determined by classifying the fault and failure types by dissolved gas analysis (DGA). The fault types are classified by analyzing 195 internal inspected transformers that faults were identified, and the failure types are classified by analyzing 338 failed transformers of Korea Electric Power Corporation. The fault types that affected DGA in oil are classified as winding, core, clamp, bushing, on load tap changer (OLTC), and oil. The faults are classified into 18 types according to subcomponent and fault cause. The failure types that affected DGA in oil are classified as winding, bushing, and OLTC. The failures are classified into 21 types according to subcomponent and failure cause. The failure results are classified as turn-to-turn breakdown, breakdown, and oil leakage. The phenomena caused by faults and failures that can be identified by visual during internal inspection are classified as carbon, discharge, and overheat traces.


Dissolved gas analysis Failure type Fault location Fault type Internal inspection Power transformer 



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Copyright information

© The Korean Institute of Electrical Engineers 2019

Authors and Affiliations

  • Yonghyun Kim
    • 2
  • Dongjin Kweon
    • 2
  • Taesik Park
    • 3
  • Seonghwan Kim
    • 3
  • Jang-Seob Lim
    • 1
    Email author
  1. 1.Division of Marine MechatronicsMokpo National Maritime UniversityMokpoRepublic of Korea
  2. 2.Department of Electrical and Electronic EngineeringKiee UniversityDaejeonRepublic of Korea
  3. 3.Department of Electrical and Control EngineeringMokpo National UniversityChonnamRepublic of Korea

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