THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Fating Yuan

,

Yuqing Jiang

,

Naiyue Zhang

,

Boyuan Kuang

,

Shengkai Jian

,

Tang Bo

online first only

Heat dissipation performance analysis and cooling module optimization of oil-immersed transformer based on multi-physical field simulation

ABSTRACT
The long-term operation of the oil-immersed transformer will cause the internal temperature to rise rapidly, which may lead to accidents such as transformer burning, which has a certain impact on the safe and reliable operation of the power grid. In this paper, the model of oil-immersed transformer is established by finite element simulation software, and the three-dimensional circuit magnetic field simulation model is established according to the structural parameters of the transformer, and the core loss and winding loss of the transformer are calculated accurately. The calculated loss is loaded into the simulation model of the flow temperature field, and the distribution characteristics of the temperature field and flow field of the transformer core and winding are obtained accurately by analyzing the heat transfer mode of the transformer and calculating the convection heat transfer coefficient formula in the heat convection theory. According to the structure of the transformer winding, the main variable parameters of the winding that affect the transformer temperature rise are selected. Through the center composite design method and range analysis, the winding geometry parameters which minimize the hot spot temperature of the transformer are obtained. In order to further reduce the temperature rise of the transformer, the principle of enhanced heat dissipation is used, and the cooling module is attached to the radiator of the transformer model, and the shape, installation position, installation method and number of the cooling module are changed respectively. Through heat flow coupling calculation, the optimal structure and installation mode of heat dissipation performance are obtained: symmetrical rectangular cooling module is installed at the upper end of the heat sink, which can effectively reduce the hot spot temperature of the transformer. The results show that the hot spot temperature of the oil-immersed transformer can be reduced from 78.1℃ to 60.7℃, and the hot spot temperature can be reduced by 22.3%. The above research provides a new idea and reference for oil immersed transformer to reduce temperature rise and improve heat dissipation performance.
KEYWORDS
oil-immersed transformer, temperature distribution, Central composite design method, Cooling module
PAPER SUBMITTED: 2024-10-03
PAPER REVISED: 2024-11-12
PAPER ACCEPTED: 2024-11-20
PUBLISHED ONLINE: 2025-01-09
DOI REFERENCE: https://doi.org/10.2298/TSCI241003281Y
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Heat dissipation performance analysis and cooling module optimization of oil-immersed transformer based on multi-physical field simulation