GE D90 Plus Instruction Manual page 240

GROUPED PROTECTION ELEMENTS
230
Table 10: GE type IAC inverse time curve constants
IAC curve shape A
IAC extreme inverse 0.0040
IAC very inverse 0.0900
IAC inverse 0.2078
IAC short inverse 0.0428
Table 11: GE type IAC curve trip times (in seconds)
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 4.846
10.0 33.979 14.983 6.058
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 4.299
10.0 29.012 13.121 5.374
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
B C
0.6379 0.6200
0.7955 0.1000
0.8630 0.8000
0.0609 0.6200
)
3.0 4.0 5.0 6.0
0.303 0.178 0.123 0.093
0.606 0.356 0.246 0.186
1.212 0.711 0.491 0.372
2.423 1.422 0.983 0.744
3.635 2.133 1.474 1.115
2.844 1.966 1.487
3.555 2.457 1.859
0.269 0.172 0.133 0.113
0.537 0.343 0.266 0.227
1.075 0.687 0.533 0.453
2.150 1.374 1.065 0.906
3.225 2.061 1.598 1.359
2.747 2.131 1.813
3.434 2.663 2.266
0.266 0.221 0.196 0.180
0.532 0.443 0.392 0.360
1.064 0.885 0.784 0.719
2.128 1.770 1.569 1.439
3.192 2.656 2.353 2.158
4.256 3.541 3.138 2.878
5.320 4.426 3.922 3.597
0.035 0.031 0.028 0.027
0.070 0.061 0.057 0.054
0.140 0.123 0.114 0.108
0.279 0.245 0.228 0.217
0.419 0.368 0.341 0.325
0.559 0.490 0.455 0.434
0.699 0.613 0.569 0.542
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
D E t
r
1.7872 0.2461 6.008
–1.2885 7.9586 4.678
–0.4180 0.1947 0.990
–0.0010 0.0221 0.222
7.0 8.0 9.0 10.0
0.074 0.062 0.053 0.046
0.149 0.124 0.106 0.093
0.298 0.248 0.212 0.185
0.595 0.495 0.424 0.370
0.893 0.743 0.636 0.556
1.191 0.991 0.848 0.741
1.488 1.239 1.060 0.926
0.101 0.093 0.087 0.083
0.202 0.186 0.174 0.165
0.405 0.372 0.349 0.331
0.810 0.745 0.698 0.662
1.215 1.117 1.046 0.992
1.620 1.490 1.395 1.323
2.025 1.862 1.744 1.654
0.168 0.160 0.154 0.148
0.337 0.320 0.307 0.297
0.674 0.640 0.614 0.594
1.348 1.280 1.229 1.188
2.022 1.921 1.843 1.781
2.695 2.561 2.457 2.375
3.369 3.201 3.072 2.969
0.026 0.026 0.025 0.025
0.052 0.051 0.050 0.049
0.105 0.102 0.100 0.099
0.210 0.204 0.200 0.197
0.314 0.307 0.301 0.296
0.419 0.409 0.401 0.394
0.524 0.511 0.501 0.493