Simulation of influence of current transformer saturation characteristic by aperiodic current

The current transformer is the important measuring element which transfers primary current to secondary circuit. Most relay protection operating depends on the current transformer signal. It is very important that whether the current transformer could accurately transfer the primary current waveform to secondary circuit. Therefore,current transformer model plays an important role in power system simulation. This paper introduces the Jiles-Atherton current transformer model which is commonly used in transient electromagnetism simulation. The process of transformer operating with no load by Jiles-Atherton current transformer model is simulated,and the influence of current transformer saturation characteristic by aperiodic component current is analyzed.