Abstract
PurposeThe purpose of this paper is the modelling and estimation of inrush currents while energising power devices under no load conditions. An analytical representation of the nonlinear B-H curve serves for considering the hysteresis behaviour in the numerical model.Design/methodology/approachThe model is implemented into a standard finite element formulation to compute transient problems.FindingsInrush currents behave like faults in power distribution facilities. Its prior estimation helps to distinguish between operating conditions and faults.Research limitations/implicationsThe magnetic cores may become extremely magnetised. At such high material saturations, the material characteristics are not measurable accurately. Hence, the results depend on the extrapolation of the B-H curves.Originality/valueThe use of first-order reversal curves within the major hysteresis loops helps in a convenient way to estimate peak and shape of the inrush currents.
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