What is the working principle of a transformer cooling system?

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This post was last edited by yuchenchf on 2015-7-19 09:04. During operation, the iron loss, copper loss, and additional losses of a transformer are converted into heat, causing the temperature of components such as the core and windings to rise. The heat dissipation process of an oil-immersed transformer is as follows: First, heat generated inside the core and windings is transferred to their surfaces through heat conduction, and then to the oil. Natural convection of the oil then carries this heat to the inner walls of the oil tank and the oil tubes of the radiator. Heat conduction further transfers this heat to the outer surfaces of the oil tank and the radiator oil tubes, after which the heat is dissipated into the surrounding air through radiation and convection. The process of forcing oil circulation to cool the transformer involves using an submersible pump to pump oil into the core or the oil channels between the windings, so that the heat there can be carried away by the cold oil flowing at a certain speed. The hot oil at the upper part of the transformer is drawn out using a submersible pump, cooled in a cooler, and then sent back to the bottom of the transformer tank, thereby forcing the transformer oil to circulate and cool the transformer.