Influence of Oil Baffle Structure on Winding Temperature Distribution of Transformer under Different Cooling Modes

The oil baffle structure provides the guiding oil circuit for the transformer winding, which plays an important role in the heat dissipation of the winding. In this paper, the finite element simulation method is used to calculate the heat-flow field of the high voltage winding of a 110kV transformer, and the influence of the oil baffle structure on the oil velocity and temperature distribution of the winding under two different cooling modes is compared. When the bottom oil baffle structure of the forced oil circulation cooling winding is missing, the local temperature of the bottom of the winding increases, and the hot spot temperature increases by 1.3K, respectively. The temperature of other parts has little change. When the oil baffle structure at the bottom of the winding in the natural oil circulation cooling mode is missing, the local temperature at the bottom of the winding increases, but the overall temperature decreases by 2-3K. The reason for this difference is that the winding of natural oil circulation cooling mode has a certain `adaptability' when the structure changes.