Fuzzy based transformer failure analysis under uncertainty

A typical power system consists of three sub-systems, namely, generation, transmission and distribution. The power transformation from generation to transmission to consumers is carried out through step-up or step-down transformers so as to reduce transmission losses as well as for making the electrical appliances to work. Transformers are also used to control voltage and are equipped with tap changers on one or more windings to change the turn ratio. Therefore, successful operation of a power transformer is an essential requirement for any power system to work which makes it an integral part of the entire system. The present study uses the conventional and expert fuzzy based fault tree analysis and highlights the importance of fuzzy based failure analysis of power transformers which will help the power system managers for paying attention towards maintenance. The expert opinions are utilized using the concept of decision making under uncertainty to carry out the failure analysis. It also ranks the importance of various failures which will fix the priority for maintenance. The suggested methodology has been illustrated with the help of an example which is a case study from India.