Guide for transformer maintenance – 2025 Edition

Transformers convert voltage and current to allow electrical power transportation over very long distances economically and efficiently and are among the most important and costly equipment in the electrical grid. Transformers are specified, designed and manufactured to be robust, and users expect them to maintain their function for several decades. Several international standards are available to help transformer users to specify transformers but there are only a few international documents that address transformer maintenance globally. This brochure aims to fill that gap.