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What are CT and PT?
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Current Transformer (CT)

It is a step-up transformer that steps down the current to a known ratio. The primary of

this transformer consists of one or more turns of thick wire connected in series with the line. The secondary consists of a large number of turns of fine wire and provide for the measuring instruments and relay a current which is a constant fraction of current in the line

Potential Transformer (PT)

It is a step-down transformer and steps down the voltage to a known ratio. The primary of this transformer consists of a large number of fine wires connected across the line. The secondary winding consists of a few turns and provides for measuring instruments and relays a voltage which is a known fraction of the line voltage
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