GE 489 Instruction Manual page 114

4.10 S9 THERMAL MODEL
The following curves illustrate the resultant overload protection for 80% and 100% voltage, respectively. For voltages inbe-
tween 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
4
90
80
70
60
50
40
30
20
10
9
8
7
6
5
4
3
2
1
1 2 3
MULTIPLES OF FULL LOAD AMPS
Figure 4–16: VOLTAGE DEPENDENT O/L PROTECTION AT 80% AND 100% VOLTAGE
4-64
489
VOLTAGE DEPENDENT
OVERLOAD PROTECTION at 80% V
4 5 6 7
808830A3.CDR
489 Generator Management Relay
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 3
8
4 SETPOINTS
489
VOLTAGE DEPENDENT
OVERLOAD PROTECTION at 100% V
4 5 6 7
MULTIPLES OF FULL LOAD AMPS
808829A3.CDR
GE Multilin
8