Publication

Abstract : Transformer failure is one of the main causes of distribution faults. Factors like an inter-winding failure, over current, oil leakage, ambient temperature, electrical faults, etc. are few of the main reasons for transformer failures. In this paper, various monitoring techniques are reviewed along with their advantages and disadvantages so that a proper monitoring technique for various transformer applications can be chosen. A case study is performed on a 500 KVA substation transformer using IEC 60076-7 specified thermal model of transformer. The parameters like top oil temperature and hot-spot temperature are calculated using differential method and exponential method to estimate the loss of life of the transformer and both the methods are compared with one another to decide on the best suited method for calculation of loss of life of the transformer.