Resumen de Inrush current computations using an optimised analytical hysteresis model

Werner Renhart, Oszkár Bíró, Christian Magele, Kurt Preis, Alexander Rabel

• Purpose The 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/approach The model is implemented into a standard finite element formulation to compute transient problems.

  Findings Inrush currents behave like faults in power distribution facilities. Its prior estimation helps to distinguish between operating conditions and faults.

  Research limitations/implications The 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/value The 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.