GE Multilin 489 Instruction Manual page 193

CHAPTER 5: SETPOINTS
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
The following curves illustrate the resultant overload protection for 80% and 100%
voltage, respectively. For voltages between these levels, the 489 shifts the acceleration
curve linearly and constantly based upon the measured voltage during generator start.
GE Multilin
1000
900
800
700
600
500
400
300
200
100
90
80
70
60
50
40
30
20
10
9
8
7
6
5
4
3
2
1
1 2
FIGURE 5–21: Voltage Dependent Overload Protection at 80% Voltage
489
VOLTAGE DEPENDENT
OVERLOAD PROTECTION at 80% V
3 4 5 6
MULTIPLES OF FULL LOAD AMPS
7 8
808830A3.CDR
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