GE Multilin 489 Instruction Manual page 104

4–42
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• Generator status either stopped, starting, or running. It includes values such as
generator load, thermal capacity used, generator speed, and instantaneous values
of power system quantities.
• The status of digital inputs.
• Last trip information, including values such as cause of last trip, time and date of
trip, generator speed and load at the time of trip, pre-trip temperature
measurements, pre-trip analog inputs values, and pre-trip instantaneous values of
power system quantities.
• Active alarms.
• Relay date and time.
• Present blocking conditions.
• General system status indication including the status of output relays, active
pickup, alarm and trip conditions.
2.
Metering Data:
• Instantaneous current measurements including phase, differential, unbalance,
ground, average, generator load, and differential currents.
• RTD Temperatures including hottest RTDs.
• Instantaneous phase to phase and phase to ground voltages (depending on the VT
connections), average voltage, and system frequency.
• Generator Speed
• Power Quantities including Apparent, Real and Reactive Power.
• Current and power demand including peak values.
• Analog inputs
• Vector information.
3.
Generator Learned Data:
• Average Generator Load
• Average Negative-Sequence Current
• Phase-Phase Voltage
• RTD Maximum Values
4. Maintenance data.
This is useful statistical information that may be used for preventive maintenance. It
includes:
• Trip counters
• General counter such as Number of Breaker Operations.
• Timers such as Generator Running Hours.
5. RTD Learned Data - includes the maximum temperature measured by each of the 12
RTDs.
6. Event recorder downloading tool.
7. Product information including model number, firmware version, additional product
information, and calibration dates.
8. Oscillography and Data Logger downloading tool.
CHAPTER 4: INTERFACES
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL