Demonstrating Moisture as a Major Contributor to Transformer Failures: The Elusive Link Revealed Through Detailed Case Studies

This paper presents an Australian utility’s journey managing moisture in transformers from 2000 to 2025 through the lens of four comprehensive case studies of power transformer failures that occurred within the utility’s fleet between 2003 and 2010. The progression from the first case to the last demonstrates the gradual adoption and integration of online monitoring and dryout practices into the business’s transformer asset management strategy.