CHAPTER 5: SETPOINTS
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–83
The following curves illustrate the resultant overload protection for 80% and 100%
voltage, respectively. For voltages between these levels, the 489 shifts the acceleration
curve linearly and constantly based upon the measured voltage during generator start.
FIGURE 5–21: Voltage Dependent Overload Protection at 80% Voltage
489
VOLTAGE DEPENDENT
OVERLOAD PROTECTION at 80% V
808830A3.CDR
1
123 45678
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
TIME TO TRIP (SECONDS)
MULTIPLES OF FULL LOAD AMPS
200
300
400
500
600
700
800
900
1000
GE Multilin
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
