Analysis of ferroresonance in neutral grounding system with nonlinear core loss |
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Authors: | Hui Meng Zhang Yan-Bin and Liu Chong-Xin |
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Institution: | School of Electrical Engineering, Xi'an Jiao Tong University, Xi'an 710049, China |
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Abstract: | The chaotic behaviour exhibited by a typical ferroresonant circuit
in a neutral grounding system is investigated in this paper. In most
earlier ferroresonance studies the core loss of the power transformer
was neglected or represented by a linear resistance. However, this is
not always true. In this paper the core loss of the power transformer is
modelled by a third order series in voltage and the magnetization
characteristics of the transformer are modelled by an 11th order two-term
polynomial. Extensive simulations are carried out to analyse the
effect of nonlinear core loss on transformer ferroresonance. A
detailed analysis of simulation results demonstrates that, with the
nonlinear core loss model used, the onset of chaos appears at a
larger source voltage and the transient duration is shorter. |
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Keywords: | ferroresonance chaotic
behaviour nonlinear core loss |
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