Stator fault damage considerations for generators on solidly grounded systems

Abstract

In recent years, the practice of connecting small turbine generators on solidly grounded medium voltage systems has become increasingly more popular. This practice introduces unique problems because of the relatively high magnitude of phase-to-ground fault current available on effectively grounded systems, and requires that special consideration be given to the increased risk of serious generator stator iron damage that can result. This paper extends earlier work on the relationship between grounding practices and generator stator ground fault damage to the special case of these solidly grounded systems.