Temperature Rise Calculation and Thermal Modeling for Oil Filled Transformers

Abstract

Continuous efforts are being made in the existing power network to make it efficient where transformer are an important part of today's network and thus thermal modeling of trans- formers has become important. Advances are being made in the design as well as material which can affect the temperature inside the transformer. So the temperature inside the transformer is a significant parameter to be governed for a transformer's performance and life expectancy. The temperature rise inside the transformer may not have immediate effects, but it still triggers other undesirable consequences like insulation failure, reducing the transformer life which ultimately affects the efficiency of the power system. And so the possible maximum temperature rise in the transformer needs to be estimated to decide the operational conditions and estimating the remaining life of the transformer. So to know the accurate temperature rise in the transformer, proper thermal modeling needs to be done. But the empirical formula method is not accurate and also a time consuming method and so software modeling becomes essential to get faster and accurate results. Therefore, FEMM analysis is been done in this report which will analyze the results obtained from that software with the results obtained with empirical formula.