Calculation and analysis of hot-spot temperature-rise of transformer structure parts based on magnetic-thermal coupling method

It is difficult to predict the hot-spot temperature-rise due to the uneven distribution of structure parts stray loss of large power transformer. This paper calculate the stray loss of transformer structure parts by using FEM, then treat it as heat source to obtain the accurate temperature distribution based on magnetic-thermal coupling method, and appropriate magnetic shields are used to reduce the stray loss and hot-spot temperature-rise in transformer structure parts. Through the magnetic-thermal simulation analysis of transformer, its follow-up to the hot-spot temperature-rise prediction, optimization designed to provide some references, with the value of engineering applications.