CHAPTER 2: INTRODUCTION
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 2–11
Time delay: 0.000 to 100.000 s in steps of 0.001
Pickup accuracy: as per phase current inputs
Timing accuracy: +50 ms at 50/60 Hz or ±0.5% total time
Elements: Trip
RTDS 1 TO 12
Pickup: 1 to 250°C in steps of 1
Pickup hysteresis: 2°C
Time delay: 3 sec.
Elements: Trip and Alarm
UNDERFREQUENCY
Required voltage: 0.50 to 0.99 × rated voltage in Phase A
Block from online: 0 to 5 sec. in steps of 1
Pickup level: 20.00 to 60.00 in steps of 0.01
Curve shapes: 1 level alarm, two level trip definite time
Time delay: 0.1 to 5000.0 sec. in steps of 0.1
Pickup accuracy: ±0.02 Hz
Timing accuracy: ±150 ms or ±1% of total time at 50Hz and 60Hz; ±300 ms or 2%
of total time at 25Hz
Elements: Trip and Alarm
UNDERVOLTAGE
Pickup level: 0.50 to 0.99 × rated V in steps of 0.01
Curve shapes: Inverse Time, definite time alarm
Time Delay: 0.2 to 120.0 s in steps of 0.1
Pickup accuracy: as per voltage inputs
Timing accuracy: ±100 ms or ±0.5% of total time
Elements: Trip and Alarm
VOLTAGE PHASE REVERSAL
Configuration: ABC or ACB phase rotation
Timing accuracy: 200 to 400 ms
Elements: Trip
VOLTS PER HERTZ
Pickup level: 1.00 to 1.99 × nominal in steps of 0.01
Curve shapes: Inverse Time, definite time alarm
Time delay: 0.1 to 120.0 s in steps of 0.1
Pickup accuracy: as per voltage inputs
Timing accuracy: ±100 ms at ≥ 1.2 × Pickup
±300 ms at < 1.2 × Pickup
Elements: Trip and Alarm
2.2.4 Digital Inputs
FIELD BREAKER DISCREPANCY
Configurable: assignable to Digital Inputs 1 to 7
Time delay: 0.1 to 500.0 s in steps of 0.1
Timing accuracy: ±100 ms or ±0.5% of total time
Elements: Trip
Courtesy of NationalSwitchgear.com
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