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Both Current and Potential Transformer are instrument Transformers which are used to measure very high current and voltage respectivly.

Current Transformer is a Step up transformer and used to measure high current, its secondry is connected to ammeter of very small capacity (usally 5 A) but its Scale is calibrated according to actul values.

Potential Transformer is a step down tansformer and its secondry is connected to voltmeter of small range but again the scale is calibrated for actul values.

So as a whole both Current and Potential Transformers are used to measure high values of Current and Voltage respectivly.

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