2–12
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 2: INTRODUCTION
GENERAL INPUT A TO G
Configurable:
ssignable Digital Inputs 1 to 7
Time delay:
0.1 to 5000.0 s in steps of 0.1
Block from online:
0 to 5000 s in steps of 1
Timing accuracy:
±100 ms or ±0.5% of total time
Elements:
Trip, Alarm, and Control
SEQUENTIAL TRIP
Configurable:
assignable to Digital Inputs 1 to 7
Pickup level:
0.02 to 0.99
×
rated MW in steps of 0.01, Low Forward Power /
Reverse Power
Time delay:
0.2 to 120.0 s in steps of 0.1
Pickup accuracy:
see power metering
Timing accuracy:
±100 ms or ±0.5% of total time
Elements:
Trip
TACHOMETER
Configurable:
assignable to Digital Inputs 4 to 7
RPM measurement:
0 to 7200 RPM
Duty cycle of pulse:
>
10%
Pickup level:
101 to 175
×
rated speed in steps of 1
Time delay:
1 to 250 s in steps of 1
Timing accuracy:
±0.5 s or ±0.5% of total time
Elements:
Trip and Alarm
2.2.5
Monitoring
DEMAND METERING
Metered values:
maximum phase current,
3 phase real power,
3 phase apparent power,
3 phase reactive power
Measurement type:
rolling demand
Demand interval:
5 to 90 min. in steps of 1
Update rate:
1 minute
Elements:
Alarm
ENERGY METERING
Description:
continuous total of +watthours and ±varhours
Range:
0.000 to 4000000.000 Mvarh
Timing accuracy:
±0.5%
Update Rate:
50 ms
LOW FORWARD POWER
Block from online:
0 to 15000 s in steps of 1
Pickup level:
0.02 to 0.99
×
rated MW
Time delay:
0.2 to 120.0 s in steps of 0.1
Pickup accuracy:
see power metering
Timing accuracy:
±100 ms or ±0.5% of total time
Elements:
Trip and Alarm
