GE 469

CHAPTER 5: SETTINGS
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–53
The following two figures illustrate the resultant overload protection curves for 80% and
100% line voltage, respectively. For voltages in between, the 469 will shift the acceleration
curve linearly and constantly based on measured line voltage during a motor start.
FIGURE 5–12: Voltage Dependent Overload Protection at 80% Voltage
1
123 4567 8
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
HIGH INERTIA LOAD OVERLOAD CURVES
8800 HP, 13.2 kV, REACTOR COOLANT PUMP
TIME TO TRIP (SECONDS)
MULTIPLES OF FULL LOAD AMPS
200
300
400
500
600
700
800
900
1000
GE Multilin
806825A4.CDR