Category: Beckwith Electric

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

• Accurate, independent controls require

no additional instrumentation for field setting

• Various ∆V and ∆F limits available

• Breaker closing times are field programmable

• 50 Hz operation available

Inputs

Gen/Line Voltage, nominal 120 V ac, 145 V ac maximum continuous. Will withstand 200 V ac for 1 sec.

Bus Voltage, nominal 120 V ac, 145 V ac maximum continuous. Will withstand 200 V ac for 1 sec.

Supply Voltage, minimum 100 V ac, maximum 140 V ac.

Enable Auto-Sync close.

Breaker Closing Time; field programmable from 20 to 800 ms.

 NOTE: Gen/Line, Bus and Supply voltages are transformer-isolated to allow complete freedom in

applications.

Burden

Gen/Line or Bus: 0.5 VA maximum at 120 V ac

Supply: 7 VA maximum at 120 V ac

Controls

UPPER VOLTAGE LIMIT (either input): 110 to 140 V ac, accuracy 1–1/2% of full scale

LOWER VOLTAGE LIMIT (either input): 90 to 120 V ac, accuracy 1–1/2% of full scale

∆V LIMIT (MAXIMUM VOLTAGE DIFFERENCE LIMIT): 1 to 5 V ac, accuracy 5% of full scale. Multiples of

this range are available. A ∆V LIMIT of 4 to 20 V ac or lower must be specified if the M-0193B is to be used

in conjunction with the M-0194 Generator Control Unit.

∆F LIMIT (Maximum Frequency Difference Limit): 0.05 to 0.5 Hz, accuracy 3% of full scale. An additional

range of 0.005 to 0.05 Hz is available.

Standard Functions

• Sync check with Phase, ∆V and ∆F with deadline/deadbus options (25)

• Phase undervoltage (27) protection

• Neutral over/undervoltage (59G/27G) protection

• Sensitive dual-setpoint, reverse power detection (32)

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

• Negative sequence voltage (47)

• Instantaneous overcurrent (50) protection

• Instantaneous neutral overcurrent (50G) protection

• Three-phase inverse time overcurrent (51V) with voltage control/voltage restraint

• Neutral inverse time overcurrent (51G) protection

• Phase overvoltage (59) protection

• Peak overvoltage (59I) protection

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

• Directional inverse and definite time phase overcurrent (67)

• Directional inverse and definite time neutral overcurrent (67N)

• Reconnect enable (79)

• Over/Underfrequency (81 O/U)

Intertie Protection M‑3520 Integrated Protection System®

• Integrated Protection System for DER Intertie, providing:

 Loss of parallel utility operation protections

 Abnormal power flow protections

 Comprehensive suite of phase and ground

fault backed protections

 Abnormal operating protections

 Reconnect and Sync Check functions

• Microprocessor-based Intertie Protection Relay integrates

protection, metering, monitoring and waveform capture

• Provides 18 base protective relay functions and

3 optional protective functions

• Local and remote serial communications capabilities, plus

IRIG-B interface

Optional Features

• Redundant power supply

• M-3915 Target Module

• M-3931 Human-Machine Interface Module

• M-3801D IPSplot® PLUS Oscillograph Analysis Software

• 4-Wire RS-485 Connection