CHAPTER 5: SETPOINTS
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
5–71
FIGURE 5–14: Typical Time-Current and Thermal Limit Curves
(ANSI/IEEE C37.96)
5.10.2 Model Setup
Setpoints
PATH: SETPOINTS
ZV
S9 THERMAL MODEL
Z
MODEL SETUP
1
10
8
6
4
2
100
80
60
4
0
20
200
300
4
00
0
100
200
300
4
00
500
600
% C
U
RR
ENT
TIME-SE
CO
N
D
S
HIGH
INE
R
TIA
M
O
T
OR
R
UNNING
O
VE
R
L
O
A
D
A
G
B
C
A
,B,
AN
D C
A
R
E THE
A
CC
ELE
R
ATI
O
N THE
R
MAL LIMIT
C
U
R
VES AT
100%, 90%,
AN
D
80%
V
O
LTAGE
, R
E
P
E
C
TIVELY
E
,
F
,
AN
D
G A
R
E THE
SAFE STALL THE
R
MAL LIMIT
TIMES AT
100%, 90%,
AN
D
80%
V
O
LTAGE
, R
E
P
E
C
TIVELY
E
F
806827
A
1
.
CDR
1 MODEL SETUP
[
Z
]
ENABLE THERMAL
MODEL: No
Range: No, Yes
MESSAGE
OVERLOAD PICKUP
LEVEL: 1.01 x FLA
Range: 1.01 to 1.25
×
FLA in steps of
0.01
MESSAGE
UNBALANCE BIAS
K FACTOR: 0
Range: 0 to 12 in steps of 1. A value of
“0” disables this feature
MESSAGE
COOL TIME CONSTANT
ONLINE: 15 min.
Range: 0 to 500 min. in steps of 1
MESSAGE
COOL TIME CONSTANT
OFFLINE: 30 min.
Range: 0 to 500 min. in steps of 1
MESSAGE
HOT/COLD SAFE
STALL RATIO: 1.00
Range: 0.01 to 1.00 in steps of 0.01
MESSAGE
ENABLE RTD
BIASING: No
Range: No, Yes
MESSAGE
RTD BIAS
MINIMUM: 40°C
Range: 0 to 250°C in steps of 1