Abstract
A reliable and endless supply of electricity is highly dependent on good operation of distribution transformers. A huge number of customers are directly supplied via any of the transformers. Loading of the transformers under unbalance conditions is an important factor that influences the life of their insulation. In this paper we will consider two typical 315 KVA, 20 kV distribution transformers with the same characteristics but under different operating conditions. Thermal coefficients and remnant life of two distribution transformers are measured and show a remarkable difference between thermal coefficients of two transformers.
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