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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
    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 2011
    1
    1 : n
    Isensed
    Isensed/n
  • 2.
    • 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 2011
    2
    Isensed
    Isensed/n
    (1 : n)
    +
    +
    VOUT
    VOUT/n


  • 3.
    • Example: Vpower=10kV, Rload=10 , Rburden=10 , and n=1000
    The current transformer model and its application (Isensed=1kA, VOUT=10V)
    CT Model and Application
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
    3
    Isensed=1kA
    (1 : 1000)
    Isensed/n=1A
    VOUT=10V
    +
    +
    VOUT/n=10mV


  • 4. CT Model and Application
    The current transformer model and its application (Isensed=1kA, VOUT=10V)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
    4
    Isensed=1kA(peak)
    VOUT/n=10mV(peak)
    Isensed/n=1A(peak)
    VOUT=10V(peak)
  • 5.
    • 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
    CT Model + Lm
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
    5
    Measured and Added to the model
  • 7. CT Model Frequency Range
    • Lm and Cp limit the frequency range of the current transformer.
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
    6
    FREQUENCY RANGE
  • 8.
    • The leakage inductance and wire resistance of the secondary side can be measured and added to the model for better simulation result
    CT Model + Lleakage + Rwire
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
    7
    Measured and Added to the model
  • 9. Device Modeling
    Input the current transformer spec: 1:n
    Measure and input Lm, Rp, and Cp
    Measure and input Llk, Rlk, and Clk
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
    8