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 CS Electrical And Electronics Staff asked 4 years ago I need short information, can anyone explain. 1 Answers 0 Vote Up Vote Down Rahul answered 4 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