Beckwith Electric M-3420 Generator Protection Relay

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

Standard Features

• Eight programmable outputs and six programmable inputs

• Oscillography recording

• 32-target storage

• Metering of all measured parameters

• Two RS-232 and one RS-485 communications ports

• Standard 19" rack-mount design

• Removable printed circuit board and power supply

• Both 50 and 60 Hz models available

• Both 1 and 5 A rated CT inputs available

• Additional trip inputs for externally connected devices

• M-3800A IPScom® Communications Software

• S-3400 IPScom Communications Software for Windows 7 or later

• IRIG-B time synchronization

• Includes Modbus and BECO 2200 protocols

Optional Features

• Redundant power supply

• M-3920 Target Module

• M-3931 HMI Module

• M-3801A IPSplot® Oscillograph Analysis Software

• 4-Wire RS-485 Connection