Independent machine protection using digital exciters

摘要

This paper discusses the use of digital exciters as indpendent protective systems to provide redundancy to primary multifunction protective systems. The study discussed in this paper shows that digital excitation systems can be used with confidence for this purpose. The analysis was done using GE's Digital Generator Protection (DGP) multifunction protective system as a bench mark for domparison. The loss of field was tested for various operating and system conditions using EMTP and a playback system. The simulation results show that the LOE protective function in EX2000 works identical to the conventional protection systems and provides reliable protection that can be implemented independent of the primary protection.