The guide assists protection engineers in applying relays and relaying schemes for stator ground faults on various generator grounding schemes. This revision of the guide includes techniques that increase security and sensitivity to ground detection schemes now easily achieved with multifunction relays. Application examples and implementation issues are also included and addressed by this guide. The guide is not intended for the selection of generator or ground connection schemes.
The recommendations made pertain to most generator installations. However, sufficient background information relating to protection requirements, applications, and setting philosophy is given to enable the reader to evaluate the need to select and apply suitable protection for most situations.