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Some aspects of generator backup protection in relation to synchronous-machine performance during h.v.-system faults

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2 Author(s)
Cook, V. ; University College, Cardiff, UK ; Rushton, J.

The fault performance of large generator units is considered in relation to the selection of generator-backup-protection settings, and a method of determining protection performance is presented, based on a simplified analysis of generator fault currents and neglecting rotor-angle swings. The validity of this approach is demonstrated and the method is used to determine the fault performance of negative-phase-sequence current and overcurrent protection. Alternative methods of overcurrent protection are examined which appear to provide improved backup protection for internal and external faults.

Published in:

Electrical Engineers, Proceedings of the Institution of  (Volume:119 ,  Issue: 7 )