Overvoltage protection during GCU failure

摘要

An overvoltage protection system (100) for a power generating system includes a generator control relay (GCR) (108) controlling a conduction path through a generator exciter field (110), a flyback impedance (109) in parallel communication with the generator exciter field (110), the flyback impedance (109) being configured to dissipate energy from the generator exciter field (110) in response to opening of the conduction path, a gate drive (107) configured to open and close the GCR (108), and an overvoltage prevention unit (105) being in signal communication with the gate drive, the overvoltage prevention unit configured to monitor a voltage and a current associated with the generator (114) and selectively open and close the conduction path in response to the monitored voltage and current.