A transformer transfers AC electrical power between windings through electromagnetic induction. It changes voltage and current while the supply frequency remains the same. Power systems use step-up transformers for efficient transmission and step-down transformers for distribution. The articles below cover operating principles, construction, equivalent circuits and common transformer types.
The collection also covers losses, efficiency, voltage regulation, insulation, oil, testing, installation, maintenance and protection. Transformer requirements depend on rating, application and the applicable standard, so practical work must follow current manufacturer instructions and site safety rules.
