(GE) Air Cooled Generator One-Line Diagram and Protection
Course Overview
In this Learning-Doc, the learner should be able
describe use of the one-line diagram, functionality of the protective relays
and how the generator may be at risk. Discussions include discussions of the
information contained on a one-line diagram, use of the R-X diagram, and
shutdown considerations. Abnormal
conditions described include stator over-current, over voltage, a stator
ground, phase-to-phase fault protection, volts-per-hertz protection, field
over-excitation, field ground, loss of excitation, negative phase sequence
currents, loss of synchronism, abnormal frequency operation, inadvertent
energization, reverse power, and use of a distance relay. Each abnormal condition description includes
the risk to the generator, instrumentation used, description of the protective
relay function, and actions to be taken.