Difference Between CT and PT


 

S.No. Current Transformer (CT) Potential Transformer (PT)
1. It is connected in series with the power circuit. It is connected in parallel with the power circuit.
2. Its secondary is connected to an Ammeter. Its secondary is connected to a Voltmeter.
3. Its secondary work always in short circuit condition. Its secondary work always in open circuit condition.
4. CT primary current depends on power circuit current. PT primary current depends on the Secondary burden.
5. CT primary current and excitation vary over a wide range with the change of power circuit current. PT primary current and excitation are restricted to a small range.
6. In this transformer, one terminal of the secondary is earthed to avoid the insulation break down. In this transformer, one terminal of secondary can be earthed for safety.
7. Its secondary never be open circuited under operation. Its secondary can be open under operation.

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