Analysis of failed and working power transformer and their diagnostics

The Transformer sustains various types of faults while in the working condition. There will be changes in electrical, mechanical and chemical properties in different parts of transformer before its failure. These changes in properties can be monitored by different condition monitoring methods. With proper analyzing the results of conditioning monitoring test the transformer can be easily saved from complete failure. In this paper various condition monitoring methodologies and its results analysis are explained by discussing the different case studies of failed and saved transformers.