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4-64 489 Generator Management Relay GE Multilin
4.10 S9 THERMAL MODEL 4 SETPOINTS
4
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.
Figure 4–16: VOLTAGE DEPENDENT O/L PROTECTION AT 80% AND 100% VOLTAGE
489
VOLTAGE DEPENDENT
OVERLOAD PROTECTION at 80% V
808830A3.CDR
1
1 23 4 567 8
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
TIME TO TRIP (SECONDS)
MULTIPLESOFFULL LOAD AMPS
200
300
400
500
600
700
800
900
1000
GE Multilin
489
VOLTAGE DEPENDENT
OVERLOAD PROTECTION at 100% V
808829A3.CDR
1
1 23 4 567 8
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
TIME TO TRIP (SECONDS)
MULTIPLESOFFULL LOAD AMPS
200
300
400
500
600
700
800
900
1000
GE Multilin