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SPICE Model of Current Transformer
SPICE Model of Current Transformer
SPICE Model of Current Transformer
SPICE Model of Current Transformer
SPICE Model of Current Transformer
SPICE Model of Current Transformer
SPICE Model of Current Transformer
SPICE Model of Current Transformer
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SPICE Model of Current Transformer

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SPICE Model of Current Transformer

SPICE Model of Current Transformer

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  • 1. Summery : current transformer <br />A current transformer (CT) <br />usually used for measurement of currents (especially large values)<br />when large values of current are expected, a CT reduces current proportional to the current in the circuit (primary current).<br />Modeling Concept:<br />Use the secondary side of a ‘voltage’ transformer model as a the current sensor then transform by 1/n to another side.<br />All Rights Reserved Copyright (C) Bee Technologies Corporation 2011<br />1<br />1 : n<br />Isensed<br />Isensed/n<br />
  • 2. <ul><li>Modeling Concept: Use the secondary side of a ‘voltage’ transformer model as a the current sensor then transform by 1/n to another side.</li></ul>The current transformer model (primitive)<br />CT Model (Primitive)<br />All Rights Reserved Copyright (C) Bee Technologies Corporation 2011<br />2<br />Isensed<br />Isensed/n<br />(1 : n)<br />+<br />+<br />VOUT<br />VOUT/n<br /><br /><br />
  • 3. <ul><li>Example: Vpower=10kV, Rload=10 , Rburden=10 , and n=1000</li></ul>The current transformer model and its application (Isensed=1kA, VOUT=10V)<br />CT Model and Application<br />All Rights Reserved Copyright (C) Bee Technologies Corporation 2011<br />3<br />Isensed=1kA<br />(1 : 1000)<br />Isensed/n=1A<br />VOUT=10V<br />+<br />+<br />VOUT/n=10mV<br /><br /><br />
  • 4. CT Model and Application<br />The current transformer model and its application (Isensed=1kA, VOUT=10V)<br />All Rights Reserved Copyright (C) Bee Technologies Corporation 2011<br />4<br />Isensed=1kA(peak)<br />VOUT/n=10mV(peak)<br />Isensed/n=1A(peak)<br />VOUT=10V(peak)<br />
  • 5. <ul><li>Lm (CT equivalent inductive magnetization), Rp, and Cp can be measured and added to the model.
  • 6. This will limit the frequency range of the CT</li></ul>CT Model + Lm<br />All Rights Reserved Copyright (C) Bee Technologies Corporation 2011<br />5<br />Measured and Added to the model<br />
  • 7. CT Model Frequency Range<br /><ul><li>Lm and Cp limit the frequency range of the current transformer.</li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2011<br />6<br />FREQUENCY RANGE<br />
  • 8. <ul><li>The leakage inductance and wire resistance of the secondary side can be measured and added to the model for better simulation result</li></ul>CT Model + Lleakage + Rwire<br />All Rights Reserved Copyright (C) Bee Technologies Corporation 2011<br />7<br />Measured and Added to the model<br />
  • 9. Device Modeling<br />Input the current transformer spec: 1:n<br />Measure and input Lm, Rp, and Cp<br />Measure and input Llk, Rlk, and Clk<br />All Rights Reserved Copyright (C) Bee Technologies Corporation 2011<br />8<br />

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