Question

What is potential transformer and current transformer?

Answer 1

A current transformer (CT) is a type of transformer that is used to measure alternating current (AC). It produces a current in its secondary which is proportional to the current in its primary. Current transformers, along with voltage or potential transformers, are instrument transformers.

Answer 2

The current transformer is mainly used for measuring such magnitude of current that the meter or instrument cannot conveniently be measured whereas the potential transformer is used for measuring the high voltage of the current.