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http://dx.doi.org/10.14775/ksmpe.2021.20.07.048

Evaluation of Structural Integrity and Cooling Performance of 4250 kVA Power Transformer with ONAN Mode  

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)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.20, no.7, 2021 , pp. 48-57 More about this Journal
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
Power Transformer; Seismic Analysis; Thermal Analysis; Hot Spot Temperature; Top Oil Temperature;
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