Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Evaluation of Structural Integrity and Cooling Performance of 4250 kVA Power Transformer with ONAN Mode

ONAN 모드 4250kVA 변압기의 구조 건전성과 냉각 성능의 평가

  • Yang, Chaofan (Dept. of Mechanical Engineering, Korea Maritime & Ocean University) ;
  • Kim, Seongik (Dept. of Mechanical Engineering, Korea Maritime & Ocean University) ;
  • Cho, Jong-Rae (Dept. of Mechanical Engineering, Korea Maritime & Ocean University)
  • ;
  • 김성익 (한국해양대학교 대학원 기계공학과) ;
  • 조종래 (한국해양대학교 대학원 기계공학과)
  • Received : 2021.04.29
  • Accepted : 2021.06.04
  • Published : 2021.07.31
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Abstract

The main research content of this paper is to evaluate the structural integrity and the cooling performance of 4250 kVA power transformer with ONAN(Oil Natural and Air Natural) mode. The dynamic analysis is used to verify the structural safety of the transformer by seismic loading. The transformer structure is simplified and NX software is used to build a three-dimensional model, and ANSYS commercial software is used to calculate the stress and deformation by applying corresponding load. The analysis result was evaluated whether it satisfies the design requirements according to the IEEE Std 693 standard. In terms of thermal analysis to evaluate the cooling performance, the thermal physical model is used to calculate the heat exchange between the radiator and the tank in the steady state, and the result is input into the Fluent software to calculate the internal temperature field of the transformer tank, which reduces the calculation cost of thermal fluid. Comparing the simulated hot spot temperature and top oil temperature of the transformer with the calculation results of the IEC60076 classic model, it is found that the error is only 1.9%.

Keywords

Acknowledgement

This work was supported by IEN Hanchang Co., LTD using the financial resource granted by the Ministry of SMEs and Startups (S2869647).

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