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PROTECTION
MULTIPLIER
CURRENT (I/I
(TDM)
1.5
10.0
11.552
IAC SHORT INVERSE
0.5
0.072
1.0
0.143
2.0
0.286
4.0
0.573
6.0
0.859
8.0
1.145
10.0
1.431
2
Table 4-28: I
T CURVE TRIP TIMES (IN SECONDS)
MULTIPLIER
CURRENT (I/I
(TDM)
1.5
0.01
0.44
0.10
4.44
1.00
44.44
10.00
444.44
100.00
4444.44
600.00
26666.7
4–178
)
pickup
2.0
3.0
4.0
7.494
5.320
4.426
0.047
0.035
0.031
0.095
0.070
0.061
0.190
0.140
0.123
0.379
0.279
0.245
0.569
0.419
0.368
0.759
0.559
0.490
0.948
0.699
0.613
2
I
T CURVES
2
The curves for the I
t are derived from the formula:
Where:
T = operate time (in seconds)
TDM = Multiplier setting
I = input current
I
= Pickup Current setting
pickup
T
= reset time in seconds (assuming energy capacity is 100% and RESET is
RESET
"Timed")
)
pickup
2.0
3.0
4.0
0.25
0.11
0.06
2.50
1.11
0.63
25.00
11.11
6.25
250.00
111.11
62.50
2500.00
1111.1
625.00
15000.0
6666.7
3750.0
4
I
T CURVES
4
The curves for the I
t are derived from the formula:
Where:
T = operate time (in seconds)
TDM = Multiplier setting
I = input current
I
= Pickup Current setting
pickup
5.0
6.0
7.0
3.922
3.597
3.369
0.028
0.027
0.026
0.057
0.054
0.052
0.114
0.108
0.105
0.228
0.217
0.210
0.341
0.325
0.314
0.455
0.434
0.419
0.569
0.542
0.524
5.0
6.0
7.0
0.04
0.03
0.02
0.40
0.28
0.20
4.00
2.78
2.04
40.00
27.78
20.41
400.00
277.78
204.08
2400.0
1666.7
1224.5
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
8.0
9.0
10.0
3.201
3.072
2.969
0.026
0.025
0.025
0.051
0.050
0.049
0.102
0.100
0.099
0.204
0.200
0.197
0.307
0.301
0.296
0.409
0.401
0.394
0.511
0.501
0.493
8.0
9.0
10.0
0.02
0.01
0.01
0.16
0.12
0.10
1.56
1.23
1.00
15.63
123.5
10.00
156.25
123.46
100.00
937.50
740.74
600.00
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