GE C60 Instruction Manual page 363

CHAPTER 5: SETTINGS
K, E = constants defined in the table
t = characteristic constant defined in the table
r
T = reset time in seconds (assuming energy capacity is 100% and
RESET
Table 5-31: IEC (BS) inverse time curve constants
IEC (BS) curve shape
IEC Curve A (BS142)
IEC Curve B (BS142)
IEC Curve C (BS142)
IEC Short Inverse
Table 5-32: IEC curve trip times (in seconds)
Multiplier Current ( I / I
pickup
(TDM)
1.5 2.0
IEC Curve A
0.05 0.860 0.501
0.10 1.719 1.003
0.20 3.439 2.006
0.40 6.878 4.012
0.60 10.317 6.017
0.80 13.755 8.023
1.00 17.194 10.029
IEC Curve B
0.05 1.350 0.675
0.10 2.700 1.350
0.20 5.400 2.700
0.40 10.800 5.400
0.60 16.200 8.100
0.80 21.600 10.800
1.00 27.000 13.500
IEC Curve C
0.05 3.200 1.333
0.10 6.400 2.667
0.20 12.800 5.333
0.40 25.600 10.667
0.60 38.400 16.000
0.80 51.200 21.333
1.00 64.000 26.667
IEC Short Inverse
0.05 0.153 0.089
0.10 0.306 0.178
0.20 0.612 0.356
0.40 1.223 0.711
0.60 1.835 1.067
0.80 2.446 1.423
1.00 3.058 1.778
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
K E t
r
0.140 0.020 9.7
13.500 1.000 43.2
80.000 2.000 58.2
0.050 0.040 0.500
)
3.0 4.0 5.0
0.315 0.249 0.214
0.630 0.498 0.428
1.260 0.996 0.856
2.521 1.992 1.712
3.781 2.988 2.568
5.042 3.984 3.424
6.302 4.980 4.280
0.338 0.225 0.169
0.675 0.450 0.338
1.350 0.900 0.675
2.700 1.800 1.350
4.050 2.700 2.025
5.400 3.600 2.700
6.750 4.500 3.375
0.500 0.267 0.167
1.000 0.533 0.333
2.000 1.067 0.667
4.000 2.133 1.333
6.000 3.200 2.000
8.000 4.267 2.667
10.000 5.333 3.333
0.056 0.044 0.038
0.111 0.088 0.075
0.223 0.175 0.150
0.445 0.351 0.301
0.668 0.526 0.451
0.890 0.702 0.602
1.113 0.877 0.752
is "Timed")
RESET
6.0 7.0 8.0
0.192 0.176 0.165
0.384 0.353 0.330
0.767 0.706 0.659
1.535 1.411 1.319
2.302 2.117 1.978
3.070 2.822 2.637
3.837 3.528 3.297
0.135 0.113 0.096
0.270 0.225 0.193
0.540 0.450 0.386
1.080 0.900 0.771
1.620 1.350 1.157
2.160 1.800 1.543
2.700 2.250 1.929
0.114 0.083 0.063
0.229 0.167 0.127
0.457 0.333 0.254
0.914 0.667 0.508
1.371 1.000 0.762
1.829 1.333 1.016
2.286 1.667 1.270
0.034 0.031 0.029
0.067 0.062 0.058
0.135 0.124 0.115
0.269 0.247 0.231
0.404 0.371 0.346
0.538 0.494 0.461
0.673 0.618 0.576
GROUPED ELEMENTS
9.0 10.0
0.156 0.149
0.312 0.297
0.623 0.594
1.247 1.188
1.870 1.782
2.493 2.376
3.116 2.971
0.084 0.075
0.169 0.150
0.338 0.300
0.675 0.600
1.013 0.900
1.350 1.200
1.688 1.500
0.050 0.040
0.100 0.081
0.200 0.162
0.400 0.323
0.600 0.485
0.800 0.646
1.000 0.808
0.027 0.026
0.054 0.052
0.109 0.104
0.218 0.207
0.327 0.311
0.435 0.415
0.544 0.518
5-195
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