GE B90 Instruction Manual page 311
Low impedance bus differential
system
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CHAPTER 5: SETTINGS
Table 5-25: 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
IAC curves
The curves for the General Electric type IAC relay family are derived from the formulae:
where
T = operate time (in seconds)
TDM = Multiplier setting
I = Input current
I
= Pickup Current setting
pkp
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
)
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
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
Eq. 5-7
5-155
5
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