what composit error,ratio error,phase error in CT and PT??
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Answer Posted / karuppasamy
The total error vector (composite error) can be seen as the composition of:
an amplitude error (ratio error), expressed in % and
an angle error, expressed in radians or seconds.
Note that for protection CT's, the angle error is disregarded and only the total composite error is given in %. When examining the equivalent diagram, one would easily conclude that the error current can only be the magnetising current of the CT. Indeed, normally the magnetising current is very low but at the saturation point of the core, 50% increase in magnetising current produces only 10% extra secondary voltage so at saturation the error current rises quickly. Therefore, the property's accuracy and saturation of the core are closely linked. Hense the error vector is allways a reducion in secondary output current; negative error. Positive error is only possible by ratio-turn correction.
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