GE C70 Instruction Manual page 397
Capacitor bank protection
and control system
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CHAPTER 5: SETTINGS
IAC curve shape
IAC Short Inverse
Table 5-30: GE type IAC curve trip times
Multiplier
Current ( I / I
pickup
(TDM)
1.5
2.0
IAC Extremely Inverse
0.5
1.699
0.749
1.0
3.398
1.498
2.0
6.796
2.997
4.0
13.591
5.993
6.0
20.387
8.990
8.0
27.183
11.987
10.0
33.979
14.983
IAC Very Inverse
0.5
1.451
0.656
1.0
2.901
1.312
2.0
5.802
2.624
4.0
11.605
5.248
6.0
17.407
7.872
8.0
23.209
10.497
10.0
29.012
13.121
IAC Inverse
0.5
0.578
0.375
1.0
1.155
0.749
2.0
2.310
1.499
4.0
4.621
2.997
6.0
6.931
4.496
8.0
9.242
5.995
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
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
A
B
C
0.0428
0.0609
0.6200
)
3.0
4.0
5.0
0.303
0.178
0.123
0.606
0.356
0.246
1.212
0.711
0.491
2.423
1.422
0.983
3.635
2.133
1.474
4.846
2.844
1.966
6.058
3.555
2.457
0.269
0.172
0.133
0.537
0.343
0.266
1.075
0.687
0.533
2.150
1.374
1.065
3.225
2.061
1.598
4.299
2.747
2.131
5.374
3.434
2.663
0.266
0.221
0.196
0.532
0.443
0.392
1.064
0.885
0.784
2.128
1.770
1.569
3.192
2.656
2.353
4.256
3.541
3.138
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
D
E
–0.0010
0.0221
6.0
7.0
8.0
0.093
0.074
0.062
0.186
0.149
0.124
0.372
0.298
0.248
0.744
0.595
0.495
1.115
0.893
0.743
1.487
1.191
0.991
1.859
1.488
1.239
0.113
0.101
0.093
0.227
0.202
0.186
0.453
0.405
0.372
0.906
0.810
0.745
1.359
1.215
1.117
1.813
1.620
1.490
2.266
2.025
1.862
0.180
0.168
0.160
0.360
0.337
0.320
0.719
0.674
0.640
1.439
1.348
1.280
2.158
2.022
1.921
2.878
2.695
2.561
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
GROUPED ELEMENTS
t
r
0.222
9.0
10.0
0.053
0.046
0.106
0.093
0.212
0.185
0.424
0.370
0.636
0.556
0.848
0.741
1.060
0.926
0.087
0.083
0.174
0.165
0.349
0.331
0.698
0.662
1.046
0.992
1.395
1.323
1.744
1.654
0.154
0.148
0.307
0.297
0.614
0.594
1.229
1.188
1.843
1.781
2.457
2.375
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. 5-10
5-193
5
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