Monitoring - GE Multilin 489 Instruction Manual

2.2.5

Monitoring

2–12
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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
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
CHAPTER 2: INTRODUCTION
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL