Beckwith Electric M-3425A Comprehensive Generator Relay

Integrated Protection System® for Generators of All Sizes

Expanded I/O (15 additional Output contacts and 8 additional control/status Inputs).

• Exceeds IEEE C37.102 and Standard 242 requirements for generator protection

• Protects generators of any prime mover, grounding and connection type

• Provides all major protective functions for generator protection including

Out‑of‑Step (78), Split‑Phase Differential (50DT), Under Frequency Time

Accumulation (81A), Inadvertent Energizing (50/27) and Turn‑to‑Turn Fault (59X)

• Expanded IPScom® Communications Software provides simple and logical setting

and programming, including logic schemes

• Simple application with Base and Comprehensive protection packages

• Load encroachment blinders and power swing blocking for system backup

protection (21) to enhance security during system abnormal conditions

• Options: Ethernet Connection, Field Ground/Brush Lift‑Off Protection

(64F/B), 100% Stator Ground Fault Protection by low frequency

injection (64S) and Expanded I/O (15 additional Output Contacts

and 8 additional Control/Status Inputs)

Protective Functions

Base Package

• Overexcitation (V/Hz) (24)

• Phase Undervoltage (27)

• Directional power sensitive triple‑setpoint Reverse Power, Low Forward

Power or Overpower detection, one of which can be used for sequential

tripping (32)

• Dual‑zone, offset‑mho Loss of Field (40), which may be applied with

undervoltage controlled accelerated tripping

• Sensitive Negative Sequence Overcurrent protection and alarm (46)

• Instantaneous Phase Overcurrent (50)

• Inadvertent Energizing (50/27)

• Generator Breaker Failure (50BF)

• Instantaneous Neutral Overcurrent (50N)

• Inverse Time Neutral Overcurrent (51N)

• Three‑phase Inverse Time Overcurrent (51V) with voltage control and

voltage restraint.

• Phase Overvoltage (59)

• Neutral Overvoltage (59N)

• Multi‑purpose Overvoltage (59X)

• VT Fuse‑Loss Detection and blocking (60FL)

• Residual Directional Overcurrent (67N)

• Four‑step Over/Underfrequency (81)

• Phase Differential Current (87)

• Ground (zero sequence) Differential Current (87GD)

• IPSlogic takes the contact input status and function status and generates

outputs by employing (OR, AND, and NOT) boolean logic and a timer.