GE Multilin 489 Instruction Manual page 35
Generator management relay
Hide thumbs
Also See for Multilin 489:
- Instruction manual (306 pages) ,
- Communications manual (78 pages) ,
- Instruction manual (259 pages)
Table of Contents
Advertisement
CHAPTER 2: INTRODUCTION
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
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)
2.5 to 300.0 Ω secondary in steps of 0.1 with adjustable
Pickup level:
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
2
Curve shapes:
I
2
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
t trip defined by k, definite time alarm
2–9
Advertisement
Table of Contents
