GE 489 User Manual
Page 10
1-2
489 Generator Management Relay
GE Multilin
1.1 OVERVIEW
1 INTRODUCTION
1
Power metering is a standard feature in the 489. The table below outlines the metered parameters available to the operator
or plant engineer either through the front panel or communications ports. The 489 is equipped with three fully functional and
independent communications ports. The front panel RS232 port may be used for setpoint programming, local interrogation
or control, and firmware upgrades. The computer RS485 port may be connected to a PLC, DCS, or PC based interface
software. The auxiliary RS485 port may be used for redundancy or simultaneous interrogation and/or control from a second
PLC, DCS, or PC program. There are also four 4 to 20 mA transducer outputs that may be assigned to any measured
parameter. The range of these outputs is scalable. Additional features are outlined below.
Table 1–1: TRIP AND ALARM PROTECTION FEATURES
TRIP PROTECTION
ALARM PROTECTION
Seven (7) Assignable Digital Inputs: General Input,
Sequential Trip (low forward power or reverse power), Field-
Breaker discrepancy, and Tachometer
7 assignable digital inputs: general input and tachometer
Overload
Negative Sequence
Offline Overcurrent (protection during startup)
Ground Overcurrent
Inadvertent Energization
Ground Directional
Phase Overcurrent with Voltage Restraint
Undervoltage
Negative-Sequence Overcurrent
Overvoltage
Ground Overcurrent
Volts Per Hertz
Percentage Phase Differential
Underfrequency
Ground Directional
Overfrequency
High-Set Phase Overcurrent
Neutral Overvoltage (Fundamental)
Undervoltage
Neutral Undervoltage (3rd Harmonic)
Overvoltage
Reactive Power (kvar)
Volts Per Hertz
Reverse Power
Voltage Phase Reversal
Low Forward Power
Underfrequency (two step)
RTD: Stator, Bearing, Ambient, Other
Overfrequency (two step)
Short/Low RTD
Neutral Overvoltage (Fundamental)
Open RTD
Neutral Undervoltage (3rd Harmonic)
Thermal Overload
Loss of Excitation (2 impedance circles)
Trip Counter
Distance Element (2 zones of protection)
Breaker Failure
Reactive Power (kvar) for loss of field
Trip Coil Monitor
Reverse Power for anti-motoring
VT Fuse Failure
Low Forward Power
Demand: Current, MW, Mvar, MVA
RTDs: Stator, Bearing, Ambient, Other
Generator Running Hours
Thermal Overload
Analog Inputs 1 to 4
Analog Inputs 1 to 4
Service (Self-Test Failure)
Electrical Lockout
IRIG-B Failure
Table 1–2: METERING AND ADDITIONAL FEATURES
METERING
ADDITIONAL FEATURES
Voltage (phasors)
Drawout Case (for ease of maintenance and testing)
Current (phasors) and Amps Demand
Breaker Failure
Real Power, MW Demand, MWh
Trip Coil Supervision
Apparent Power and MVA Demand
VT Fuse Failure
Reactive Power, Mvar Demand, Positive and Negative MVarh
Simulation
Frequency
Flash Memory for easy firmware upgrades
Power Factor
RTD
Speed in RPM with a Key Phasor Input
User-Programmable Analog Inputs