Current Transformer Accuracy Class as per IEC 61869-2

Current transformer Accuracy class is highest permissible percentage error at rated current for that accuracy class, as per IEC 61869-2 and IS 2705.
Current transformer Accuracy class is highest permissible percentage error at rated current for that accuracy class, as per IEC 61869-2 and IS 2705.
Accuracy
Class		Allowed Error
at 1% of
Rated Current		Allowed Error
at 5 % of
Rated Current		Allowed Error
at 20 % of
Rated Current		Allowed Error
at 100 % of
Rated Current		Allowed Error
at 120 % of
Rated Current
Class 13 %1.5 %1 %1 %
Class 0.51.5 %0.75 %0.5 %0.5 %
Class 0.5s1.5 %0.75 %0.5 %0.5 %0.5 %
Class 0.20.75 %0.35 %0.2 %0.2 %
Class 0.2s0.75 %0.35 %0.2 %0.2 %0.2 %
Class 0.10.4 %0.2 %0.1 %0.1 %
Current Transformer Accuracy Class

Energy Meter or Load Manager Accuracy is defined in IEC 62053.

Accuracy of Energy Measurement is addition of all the components used for measurement, that is CT and Meter both, which is called System Accuracy.
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