GE Multilin 489 User Manual

CHAPTER 2: INTRODUCTION
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 2–9
HIGH-SET PHASE OVERCURRENT
Pickup level: 0.15 to 20.00 × CT in steps of 0.01
Time delay: 0.00 to 100.00 s in steps of 0.01
Pickup accuracy: as per phase current inputs
Timing accuracy: ±50 ms at 50/60 Hz or ±0.5% total time
Elements: Trip
INADVERTENT ENERGIZATION
Arming signal: undervoltage and/or offline from breaker status
Pickup level: 0.05 to 3.00 × CT in steps of 0.01 of any one phase
Time delay: no intentional delay
Pickup accuracy: as per phase current inputs
Timing accuracy: +50 ms at 50/60 Hz
Elements: Trip
LOSS OF EXCITATION (IMPEDANCE)
Pickup level: 2.5 to 300.0 Ω secondary in steps of 0.1 with adjustable
impedance offset 1.0 to 300.0 Ω secondary in steps of 0.1
Time delay: 0.1 to 10.0 s in steps of 0.1
Pickup accuracy: as per voltage and phase current inputs
Timing accuracy: ±100 ms or ±0.5% of total time
Elements: Trip (2 zones using impedance circles)
NEGATIVE SEQUENCE OVERCURRENT
Pickup level: 3 to 100% FLA in steps of 1
Curve shapes: I
2
2
t trip defined by k, definite time alarm
Time delay: 0.1 to 100.0 s in steps of 0.1
Pickup accuracy: as per phase current inputs
Timing accuracy: ±100ms or ± 0.5% of total time
Elements: Trip and Alarm
NEUTRAL OVERVOLTAGE (FUNDAMENTAL)
Pickup level: 2.0 to 100.0 V secondary in steps of 0.01
Time delay: 0.1 to 120.0 s in steps of 0.1
Pickup accuracy: as per neutral voltage input
Timing accuracy: ±100 ms or ±0.5% of total time
Elements: Trip and Alarm
NEUTRAL UNDERVOLTAGE
(3RD HARMONIC)
Blocking signals: low power and low voltage if open delta
Pickup level: 0.5 to 20.0 V secondary in steps of 0.01 if open delta VT;
adaptive if wye VT
Time delay: 5 to 120 s in steps of 1
Pickup accuracy: as per Neutral Voltage Input
Timing accuracy: ±3.0 s
Elements: Trip and Alarm
OFFLINE OVERCURRENT
Pickup level: 0.05 to 1.00 × CT in steps of 0.01 of any one phase
Time delay: 3 to 99 cycles in steps of 1
Pickup accuracy: as per phase current inputs
Timing accuracy: +50ms at 50/60 Hz
Elements: Trip
Courtesy of NationalSwitchgear.com

GE Multilin 489 Specifications

General

Brand	GE
Model	Multilin 489
Category	Relays
Language	English