Why is it important to specify the minimum accuracy of Current Transformers (CTs) for power measurement?

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Why is it important to specify the minimum accuracy of Current Transformers (CTs) for power measurement?

The Current Transformer is the main component affecting power measurement(s). The accuracy class of the CT has to be better than that of the power meter in order to achieve the required measurement accuracy. Power Meter suppliers will usually specify the minimum CT accuracy class required to achieve the meter measurement accuracy.

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