Current transformer analysis under transient conditions

This paper deals with detailed analysis of a current transformer (CT) under transient conditions. The equivalent circuit parameters of a real CT are determined by means of FEM and verified by measurement for measuring and protective part of CT. A developed mathematical model of CT with nonlinear B-H curve is then used in a circuit simulation to study different transient conditions under normal and fault operation. A comparison to the measured signal on a real power line during fault condition is also given.