GE Multilin 489 Instruction Manual page 29

CHAPTER 2: INTRODUCTION
Note
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
Table 2–1: Trip and Alarm Protection Features
Trip Protection
Seven (7) Assignable Digital Inputs:
General Input, Sequential Trip (low
forward power or reverse power), Field-
Breaker discrepancy, and Tachometer
Offline Overcurrent (protection during
startup)
Inadvertent Energization
Phase Overcurrent with Voltage Restraint
Negative-Sequence Overcurrent
Ground Overcurrent
Percentage Phase Differential
Ground Directional
High-Set Phase Overcurrent
Undervoltage
Overvoltage
Volts Per Hertz
Voltage Phase Reversal
Underfrequency (two step)
Overfrequency (two step)
Neutral Overvoltage (Fundamental)
Neutral Undervoltage (3rd Harmonic)
Loss of Excitation (2 impedance circles)
Distance Element (2 zones of protection)
Reactive Power (kvar) for loss of field
Reverse Power for anti-motoring
Low Forward Power
RTDs: Stator, Bearing, Ambient, Other
Thermal Overload
Analog Inputs 1 to 4
Electrical Lockout
The following protection elements require neutral-end current inputs.
• Distance Element
• Offline Overcurrent
• Phase Differential
Alarm Protection
7 assignable digital inputs: general input
and tachometer
Overload
Negative Sequence
Ground Overcurrent
Ground Directional
Undervoltage
Overvoltage
Volts Per Hertz
Underfrequency
Overfrequency
Neutral Overvoltage (Fundamental)
Neutral Undervoltage (3rd Harmonic)
Reactive Power (kvar)
Reverse Power
Low Forward Power
RTD: Stator, Bearing, Ambient, Other
Short/Low RTD
Open RTD
Thermal Overload
Trip Counter
Breaker Failure
Trip Coil Monitor
VT Fuse Failure
Demand: Current, MW, Mvar, MVA
Generator Running Hours
Analog Inputs 1 to 4
Service (Self-Test Failure)
IRIG-B Failure
2–3