Protection - GE Multilin 489 Instruction Manual

2.2.3

Protection

2–8
Courtesy of NationalSwitchgear.com
PULSE OUTPUT
Parameters: + kwh, +kvarh, –kvarh
Interval: 1 to 50000 in steps of 1
Pulse width: 200 to 1000 ms in steps of 1
RELAYS
Relay contacts must be considered unsafe to touch when the relay is energized! If the
output relay contacts are required for low voltage accessible applications, it is the
customer's responsibility to ensure proper insulation levels.
Configuration: 6 electromechanical Form-C relays
Contact material: silver alloy
Operate time: 10 ms
Make/carry: 30 A for 0.2 s,
10 A continuous (for 100000 operations)
Maximum ratings for 100000 operations:
DC Resistive
DC inductive
L/R = 40 ms
AC Resistive
AC Inductive PF
= 0.4
PHASE DISTANCE (IMPEDANCE)
Characteristics: offset mho
Reach (secondary Ω): 0.1 to 500.0 Ω in steps of 0.1
Reach accuracy: ±5%
Characteristic angle: 50 to 85° in steps of 1
Time delay: 0.15 to 150.0 s in steps of 0.1
Timing accuracy: ±50 ms or ±0.5% of total time
Number of zones: 2
GROUND DIRECTIONAL
0.05 to 20.00 × CT in steps of 0.01
Pickup level:
Time delay: 0.1 to 120.0 s in steps of 0.1
Pickup accuracy: as per phase current inputs
Timing accuracy: ±100 ms or ±0.5% of total time
Elements: Trip and Alarm
GROUND OVERCURRENT
Pickup level: 0.05 to 20.00 × CT in steps of 0.01
Curve shapes: ANSI, IEC, IAC, Flexcurve, Definite Time
Time delay: 0.00 to 100.00 s in steps of 0.01
Pickup accuracy: as per ground current input
Timing accuracy: +50 ms at 50/60 Hz or ±0.5% total time
Elements: Trip
Voltage Break Max. Load
30 V 10 A 300 W
125 V 0.5 A 62.5 W
250 V 0.3 A 75 W
30 V 5 A 150 W
125 V 0.25 A 31.3 W
250 V 0.15 A 37.5 W
120 V 10 A 2770 VA
250 V 10 A 2770 VA
120 V 4 A 480 VA
250 V 3 A 750 VA
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 2: INTRODUCTION