GE 469 Instruction Manual page 146

469
Motor Management Relay
5–40
1000
900
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100
90
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FIGURE 5–8: Thermal Limits for High Inertial Load
To illustrate the Voltage Dependent Overload Curve feature, the thermal limits of
FIGURE 5–8: Thermal Limits for High Inertial Load will be used.
1. Construct a custom curve for the running overload thermal limit. If the curve
does not extend to the acceleration thermal limits, extend it such that the curve
intersects the acceleration thermal limit curves (see the Custom Curve below).
2. Enter the per unit current value for the acceleration overload curve intersect
with the custom curve for 80% line voltage. Also enter the per unit current and
safe stall protection time for 80% line voltage (see the Acceleration Curves
below).
3. Enter the per unit current value for the acceleration overload curve intersect
with the custom curve for 100% line voltage. Also enter the per unit current and
safe stall protection time for 100% line voltage (see the Acceleration Curves
below).
http://www.GEindustrial.com/multilin
GE Multilin
HIGH INERTIA LOAD OVERLOAD CURVES
8800 HP, 13.2 kV, REACTOR COOLANT PUMP
1- Running Overload Thermal Limit
1
2- Acceleration Thermal Limit at 80%V
3- Acceleration Thermal Limit at 100%V
4- Locked Rotor Thermal Limit
5- Motor Acceleration Curve at 80% V
6- Motor Acceleration Curve at 100%V
2
3
5
6
3 4 5
MULTIPLES OF FULL LOAD AMPS
S5 Thermal Model
4
6 7 8
806821A4.CDR
GE Multilin