Generator Protection M‑3420

Integrated Protection System® for Generators of All Sizes

• Microprocessor-based Generator Protection system

provides 17 protective relay functions

• Individually programmable input contacts can be

programmed to activate any one of eight output contacts

• Local and remote communications capability for both

monitoring and control functions

Protective Functions

• Overexcitation (V/Hz) protection (24)

• Phase Undervoltage protection (27)

• Sensitive dual-setpoint, reverse power detection suitable for sequential tripping (32)

• Dual-zone, offset-mho loss-of-field protection (40)

• Sensitive negative-sequence overcurrent protection and alarming (46)

• Instantaneous overcurrent (50) protection

• Inadvertent generator energizing protection (50/27)

• Generator breaker failure protection (50BF)

• Neutral inverse time overcurrent (51N)

• Instantaneous overcurrent (50N) protection

• Three-phase inverse time overcurrent (51V)

• Phase overvoltage (59)

• Generator ground fault protection (59N)

• VT fuse-loss detection and blocking (60FL)

• Four-step over/underfrequency protection (81)

• Generator phase differential (87)

• Ground differential (87GD) protection