What is potential transformer and where it used? All Questions › Category: Switchgear And Protection › What is potential transformer and where it used? 0 Vote Up Vote Down Chetan Shidling Staff asked 5 years ago I need short information. 1 Answers 0 Vote Up Vote Down Chetan Shidling Staff answered 5 years ago The potential transformer is used to measure high voltage. It is mainly used in electrical substations.