This book is a one-stop guide to state-of-the-art research in transformer ageing, condition monitoring and diagnosis. It is backed by rigorous research projects supported by the Australian Research Council in collaboration with several transmission and distribution companies. Many of the diagnostic techniques and tools developed in these projects have been applied by electricity utilities and would appeal to both researchers and practicing engineers. Important topics covered in this book include transformer insulation materials and their ageing behaviour, transformer condition monitoring techniques and detailed diagnostic techniques and their interpretation schemes. It also features a monitoring framework for smart transformers as well as a chapter on biodegradable oil. . Offers a comprehensive coverage of transformer ageing topics including insulation materials, dielectric properties and ageing mechanisms, condition monitoring and diagnostic techniques. Features chapters on smart transformer monitoring frameworks, transformer life estimation and biodegradable oil behaviour. Highlights industrially relevant techniques adopted in electricity utilities, backed by extensive research Transformer Ageing: Monitoring and Estimation Techniques is an industrially relevant and essential textbook for graduate students, engineers and researchers studying transformers and condition monitoring techniques. It is also a helpful reference for industry professionals working in transformer condition monitoring and life assessment.