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  • 1.
    Theocharis, Andreas
    et al.
    Univ Patras, Dept Elect & Comp Engn, Patras 26500, Rion, Greece..
    Milias-Argitis, J.
    Zacharias, T.
    Three-phase transformer model including magnetic hysteresis and eddy currents effects2009Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 24, nr 3, s. 1284-1294Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, a three-phase transformer model is developed to be suitable for slow transient and power-quality studies. The proposed model takes into account the eddy currents, the magnetic core topology, and the nonlinear characteristics of the core material. In order to model the eddy currents effects in the magnetic core, Bertotti’s work for the eddy currents is used and nonlinear resistors dependent on the magnetic core topology are proposed. A systematic procedure is developed for the determination of the incremental self and mutual inductances of the windings. The nonlinear characteristics of the core material are represented either by a magnetization curve or by a hysteresis loop. The hysteresis loop is introduced either by the mathematical model proposed by Tellinen or by the macroscopic model presented by Jiles-Atherton. Simulations results are compared to published measurements in order to verify the proposed model. © 2009 IEEE.

  • 2.
    Theocharis, Andreas
    et al.
    Delft Univ Technol, Fac EEMCS, NL-2628 CD Delft, Netherlands..
    Popov, M.
    Delft Univ Technol, Fac EEMCS, NL-2628 CD Delft, Netherlands..
    Seibold, R.
    Siemens AG, Power Transmiss Div Transformers, D-73230 Kirchheim Unter Teck, German.
    Voss, S.
    Siemens AG, Power Transmiss Div Transformers, D-90461 Nurnberg, Germany.
    Eiselt, M.
    Siemens AG, D-13629 Berlin, Germany.
    Analysis of switching effects of vacuum circuit breaker on dry-type foil-winding transformers validated by experiments2015Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 30, nr 1, s. 351-359Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, the prestrike and the restrike effects during switching a vacuum circuit breaker (VCB) connected to a dry-type foil-winding transformer are theoretically and experimentally analyzed. The analysis is conducted by performing a wide range of experimental three-phase switching ON/OFF tests for a 3.75-MVA prototype test transformer connected to a VCB by a cable with different lengths and for different loading conditions. A refined transformer model is successfully applied for the computation of the voltage distribution along the transformer windings. In particular, the winding properties are separately investigated, for which the core influence for frequencies above some tens of kilohertz is studied, and the terminal impedance variation for a broad frequency range is accurately calculated. The simulated results are excellent. Based on these results, an analysis was performed to evaluate the severity of the switching operations by applying spectral analysis of the recorded signals. The statistical analysis of the overvoltages with respect to the cable length and the load value shows that long cables do not guarantee lower overvoltages because of the load and its interaction with the system that makes each case unique. © 2014 IEEE.

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