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Current Transformer Vs Potential Transformer

2013-03-10 11:04:29

Difference between C.T. and P.T.

Current Transformer
 Potential transformer
The secondary of a C.T can not be open circuited on any circumstance when it is under service.
 The secondary of  a P.T can be open circuited without any damage being caused either to the operator or the transformer.
A CT may be considered as a series transformer.
 P.T may be considered as a parallel transformer.
The primary current in a C.T is independent of the secondary circuit conditions (burden).
 The primary current of a P.T depends upon the secondary circuit conditions (burden).
The primary winding of the CT is connected in series with the line carring the current to be measured. Hence it carries of the full line current.
 The primary winding P.T is connected across the line of voltage to be measured. Hence the full line voltage is impressed across its terminal.
With the help of CT, a 5A ammeter can be used measure a high current like 200A.
 With the help of P.T, a 120V voltmeter can be used to measure very high voltages like 11KV.

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