An Investigation on the Failure of 12.5 MVA Power Transformer at 66/11 kV Thapar Grid

Abstract

The failure of a 12.5 MVA power transformer can have significant implications for power systems, impacting reliability and efficiency. This study investigates the common causes and diagnostic methods associated with such failures. Key factors contributing to transformer failure include insulation breakdown, mechanical issues, thermal problems, and electrical disturbances. Advanced diagnostic techniques such as Dissolved Gas Analysis (DGA), Sweep Frequency Response Analysis (SFRA), and Partial Discharge (PD) testing are utilized to identify and analyze the root causes. The role of maintenance practices, design flaws, and operational stresses is also examined. Through case studies and data analysis, the research highlights the importance of proactive monitoring and timely interventions to extend the lifespan and performance of power transformers. Recommendations for improving diagnostic accuracy and enhancing transformer reliability are provided to mitigate the risks associated with transformer failures in power systems. The Study presented in this work is based on the failure of a 12.5 MVA power transformer in the Thapar grid. A detailed investigation of the failure, possible causes, relevant data, etc, are presented.