GE Multilin 489 Instruction Manual page 157
Generator management relay
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Also See for Multilin 489:
- Instruction manual (306 pages) ,
- Communications manual (78 pages) ,
- Instruction manual (38 pages)
Table of Contents
CHAPTER 5: SETPOINTS
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
The V/Hz Curve 1 trip curves are shown below for delay settings of 0.1, 0.3, 1, 3, and 10
seconds.
1000
100
10
1
0.1
0.01
1.00
The formula for Volts/Hertz Curve 2 is:
T
---------------------------------------------------------- -
=
V F ⁄
------------------------------------------------- - 1
(
V
⁄
F
nom
where: T = trip time in seconds
D =
VOLTS/HERTZ TRIP DELAY
V = RMS measurement of Vab
F = frequency of Vab
V
= generator voltage setpoint
NOM
F
= generator frequency setpoint
S
Pickup =
VOLTS/HERTZ TRIP PICKUP
The V/Hz Curve 2 trip curves are shown below for delay settings of 0.1, 0.3, 1, 3, and 10
seconds.
1000
100
10
1
0.1
1.00
1.20
1.40
1.60
Multiples of Volts/Hertz Pickup
D
V
-- -
>
, when
Pickup
F
–
) Pickup
×
s
setpoint
setpoint
1.20
1.40
1.60
Multiples of Volts/Hertz Pickup
10
3
1
0.3
0.1
1.80
2.00
808743A1-X1.CDR
(EQ 5.21)
10
3
1
0.3
0.1
1.80
2.00
808743A1-X2.CDR
5–47
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