Estimation of the inductive current transformer derating for operation with distorted currents

Abstract

The aim of the paper is to present a new method for estimation of the CT (Current Transformer) rated primary current and/or load of the secondary winding derating levels for transformation of distorted current in relation to the rated values fixed for transformation of sinusoidal current. This ensures the values of the CT composite errors/transformer correction factors as resulting from its IEC 60044-1/IEEE C57.13 accuracy class in condition of distorted currents transformation.