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Essentially it looks like three single-phase transformers sharing a joined core as in Figure below. A three-phase transformer is made of three sets of primary and secondary windings, each set wound around one leg of an iron core assembly. Each of these materials is suitable for certain applications. Three-Phase Transformer Windings and Connections. Commonly used core materials are air, soft iron, and steel. This will limit the frequency range of the CTCT Model + LmAll Rights Reserved Copyright (C) Bee Technologies Corporation 20115Measured and Added to the modelĬT Model Frequency RangeLm and Cp limit the frequency range of the current transformer. Transformer Core The composition of a transformer core depends on voltage, current, and frequency. Lm (CT equivalent inductive magnetization), Rp, and Cp can be measured and added to the model. Modeling Concept: Use the secondary side of a ‘voltage’ transformer model as a the current sensor then transform by 1/n to another side.The current transformer model (primitive)CT Model (Primitive)All Rights Reserved Copyright (C) Bee Technologies Corporation 20112IsensedIsensed/n(1 : n)++VOUTVOUT/nĮxample: Vpower=10kV, Rload=10, Rburden=10, and n=1000The current transformer model and its application (Isensed=1kA, VOUT=10V)CT Model and ApplicationAll Rights Reserved Copyright (C) Bee Technologies Corporation 20113Isensed=1kA(1 : 1000)Isensed/n=1AVOUT=10V++VOUT/n=10mVĬT Model and ApplicationThe current transformer model and its application (Isensed=1kA, VOUT=10V)All Rights Reserved Copyright (C) Bee Technologies Corporation 20114Isensed=1kA(peak)VOUT/n=10mV(peak)Isensed/n=1A(peak)VOUT=10V(peak) Summery : current transformer A current transformer (CT) usually used for measurement of currents (especially large values)when large values of current are expected, a CT reduces current proportional to the current in the circuit (primary current).Modeling Concept:Use the secondary side of a ‘voltage’ transformer model as a the current sensor then transform by 1/n to another side.All Rights Reserved Copyright (C) Bee Technologies Corporation 201111 : nIsensedIsensed/n