GE B90 Instruction Manual page 365

CHAPTER 5: SETTINGS
A to 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 is "Timed")
RESET
Table 5-27: GE type IAC inverse time curve constants
IAC curve shape
IAC Extreme Inverse
IAC Very Inverse
IAC Inverse
IAC Short Inverse
Table 5-28: 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
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
A B C
0.0040 0.6379 0.6200
0.0900 0.7955 0.1000
0.2078 0.8630 0.8000
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
1.7872 0.2461
–1.2885 7.9586
–0.4180 0.1947
–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
6.008
4.678
0.990
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
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