What is current transformer and why it is used? All Questions › Category: Switchgear And Protection › What is current transformer and why it is used? 0 Vote Up Vote Down Chetan Shidling Staff asked 5 years ago I need short information, can anyone explain. 1 Answers 0 Vote Up Vote Down Rahul answered 5 years ago Current transformer is a device which measures the high current because with help of Multimeter we cant measure the high current so we extend the range and thus we use c