Current Transformer Phase Displacement as per IEC 61869-2 In Practice there wiill always difference in phase displacement between primary and secondary currents, Allowed limits are defined in IEC 61869-2.
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.