Learnings From Power Transformer Failures in Tata Power

In the recent past, failures of few new as well as old Power Transformers have been experienced in Tata Power System. In view of substantial increase in failure of Power Transformers, detailed study of these failures were carried out along with system studies, operation and maintenance practices, design review etc. to obtain sustainable solutions to minimize transformer failures, which will lead to reliable & safe power supply to customers. This paper presents findings from the detailed study and recommendations to minimize recurrence of power transformer failures. Some of the technical cum administrative approaches are also discussed enabling Asset Manager to derive necessary justifications for life cycle management of Power Transformers (Design, Operation & Maintenance, Renovation and Modernization - repairs, overhauls, rewinding and replacement strategy).