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Analysis of circuits containing components with cores of ferromagnetic material

Analysis of circuits containing components with cores of ferromagnetic material

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Examinations of ferromagnetic behaviour under conditions likely on power systems show that eddy currents may be allowed for by including an appropriate linear resistor in mathematical models. They also show that hysteresis paths depend on the previous history of a core but are hardly affected by the time derivative of the flux. Current-transformer studies are described to illustrate a computational method in which discrete points on a number of hysteresis paths are specified. An extrapolation technique is used, and consideration is given to points at which flux reversals occur. It is shown that highly-accurate representation may be achieved.

References

    1. 1)
      • Power transformer core behaviour under transient conditions
    2. 2)
      • An appraisal of several nonlinear hysteresis loop models
    3. 3)
      • A generalised hysteresis model
    4. 4)
      • , Transient performance of current transformers and capacitance potential device under system fault
    5. 5)
      • Digital simulation of the hysteresis motor
    6. 6)
      • , Current transformers—their transient and steady-state performance
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