The present paper investigates the conditions which make possible the occurrence of delayed current zeros in power stations equipped with three-winding step-up transformers. The current resulting from a fault at the LV-terminals of the three-winding step-up transformer is usually characterized by a high degree of asymmetry and can lead to delayed zeros. Despite the delayed current zeros resulting from this type of fault are not considered in IEEE Standard C37.013-1997 (R2008) and in its amendment IEEE Standard C37.013a-2007, they should be taken into account when studying the suitability of a generator circuit-breaker for the application. The conditions which make possible the occurrence of such a phenomenon are analysed by means of Laplace transform. The corresponding results in time-domain are validated by comparing the waveform of the current obtained with ATP simulations.

Application of Laplace Transform to Analyse Delayed Current Zeros in Power Stations Which Employ Three-Winding Step-Up Transformer

DELFANTI, MAURIZIO;PALAZZO, MIRKO
2013

Abstract

The present paper investigates the conditions which make possible the occurrence of delayed current zeros in power stations equipped with three-winding step-up transformers. The current resulting from a fault at the LV-terminals of the three-winding step-up transformer is usually characterized by a high degree of asymmetry and can lead to delayed zeros. Despite the delayed current zeros resulting from this type of fault are not considered in IEEE Standard C37.013-1997 (R2008) and in its amendment IEEE Standard C37.013a-2007, they should be taken into account when studying the suitability of a generator circuit-breaker for the application. The conditions which make possible the occurrence of such a phenomenon are analysed by means of Laplace transform. The corresponding results in time-domain are validated by comparing the waveform of the current obtained with ATP simulations.
EuroCon 2013
978-146732232-4
Delayed current zeros, Fault currents, Generator circuit-breaker, Laplace transform, Three-winding step-up transformer
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/741366
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