GE C60 Instruction Manual page 365

CHAPTER 5: SETTINGS
Multiplier Current ( I / I
pickup
(TDM)
1.5 2.0
10.0 11.552 7.494
IAC Short Inverse
0.5 0.072 0.047
1.0 0.143 0.095
2.0 0.286 0.190
4.0 0.573 0.379
6.0 0.859 0.569
8.0 1.145 0.759
10.0 1.431 0.948
2
I t curves
2
The I t curves are derived as follows:
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 "Timed")
RESET
2
Table 5-35: I t curve trip times
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 4444.4
600.00 26666.7
FlexCurves
FlexCurves are described in the FlexCurves section later in this chapter. The curve shapes for the FlexCurves are derived
from the formulae:
where
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
)
3.0 4.0 5.0
5.320 4.426 3.922
0.035 0.031 0.028
0.070 0.061 0.057
0.140 0.123 0.114
0.279 0.245 0.228
0.419 0.368 0.341
0.559 0.490 0.455
0.699 0.613 0.569
)
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
2500.0 1111.1 625.00
15000.0 6666.7 3750.0
6.0 7.0 8.0
3.597 3.369 3.201
0.027 0.026 0.026
0.054 0.052 0.051
0.108 0.105 0.102
0.217 0.210 0.204
0.325 0.314 0.307
0.434 0.419 0.409
0.542 0.524 0.511
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
GROUPED ELEMENTS
9.0 10.0
3.072 2.969
0.025 0.025
0.050 0.049
0.100 0.099
0.200 0.197
0.301 0.296
0.401 0.394
0.501 0.493
Eq. 5-11
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 12.35 10.00
156.25 123.46 100.00
937.50 740.74 600.00
Eq. 5-12
Eq. 5-13
5-197
5