4-40 469 Motor Management Relay GE Power Management
4.6 S5 THERMAL MODEL 4 SETPOINT PROGRAMMING
4
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 4–14: VOLTAGE DEPENDENT OVERLOAD PROTECTION AT 80% V
1
123 456 78
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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
806825A3.CDR806825A3.CDR
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