Our Questions and Answers section in this edition of Electrical Tester is a little different from those that have appeared in past issues. That’s because this time we’re dealing with a more complex and demanding issue than usual: IEC 61850, the...

Transformer Turns Ratio (TTR) testing is one of the most common ways of assessing the condition of a transformer’s windings and core. Throughout the life of a transformer, TTR results are compared against the nameplate ratings to reveal insulation...