CHAPTER 5: SETTINGS GROUPED ELEMENTSB90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-1735A to E = constants defined in the tabletr = characteristic constant defined in the tableTRESET = reset time in seconds (assuming energy capacity is 100% and RESET is “Timed”)Table 5-27: GE type IAC inverse time curve constantsTable 5-28: GE type IAC curve trip timesIAC curve shape A B C D E trIAC Extreme Inverse 0.0040 0.6379 0.6200 1.7872 0.2461 6.008IAC Very Inverse 0.0900 0.7955 0.1000 –1.2885 7.9586 4.678IAC Inverse 0.2078 0.8630 0.8000 –0.4180 0.1947 0.990IAC Short Inverse 0.0428 0.0609 0.6200 –0.0010 0.0221 0.222Multiplier(TDM)Current ( I / I pickup )1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0IAC Extremely Inverse0.5 1.699 0.749 0.303 0.178 0.123 0.093 0.074 0.062 0.053 0.0461.0 3.398 1.498 0.606 0.356 0.246 0.186 0.149 0.124 0.106 0.0932.0 6.796 2.997 1.212 0.711 0.491 0.372 0.298 0.248 0.212 0.1854.0 13.591 5.993 2.423 1.422 0.983 0.744 0.595 0.495 0.424 0.3706.0 20.387 8.990 3.635 2.133 1.474 1.115 0.893 0.743 0.636 0.5568.0 27.183 11.987 4.846 2.844 1.966 1.487 1.191 0.991 0.848 0.74110.0 33.979 14.983 6.058 3.555 2.457 1.859 1.488 1.239 1.060 0.926IAC Very Inverse0.5 1.451 0.656 0.269 0.172 0.133 0.113 0.101 0.093 0.087 0.0831.0 2.901 1.312 0.537 0.343 0.266 0.227 0.202 0.186 0.174 0.1652.0 5.802 2.624 1.075 0.687 0.533 0.453 0.405 0.372 0.349 0.3314.0 11.605 5.248 2.150 1.374 1.065 0.906 0.810 0.745 0.698 0.6626.0 17.407 7.872 3.225 2.061 1.598 1.359 1.215 1.117 1.046 0.9928.0 23.209 10.497 4.299 2.747 2.131 1.813 1.620 1.490 1.395 1.32310.0 29.012 13.121 5.374 3.434 2.663 2.266 2.025 1.862 1.744 1.654IAC Inverse0.5 0.578 0.375 0.266 0.221 0.196 0.180 0.168 0.160 0.154 0.1481.0 1.155 0.749 0.532 0.443 0.392 0.360 0.337 0.320 0.307 0.2972.0 2.310 1.499 1.064 0.885 0.784 0.719 0.674 0.640 0.614 0.5944.0 4.621 2.997 2.128 1.770 1.569 1.439 1.348 1.280 1.229 1.1886.0 6.931 4.496 3.192 2.656 2.353 2.158 2.022 1.921 1.843 1.7818.0 9.242 5.995 4.256 3.541 3.138 2.878 2.695 2.561 2.457 2.37510.0 11.552 7.494 5.320 4.426 3.922 3.597 3.369 3.201 3.072 2.969IAC Short Inverse0.5 0.072 0.047 0.035 0.031 0.028 0.027 0.026 0.026 0.025 0.0251.0 0.143 0.095 0.070 0.061 0.057 0.054 0.052 0.051 0.050 0.0492.0 0.286 0.190 0.140 0.123 0.114 0.108 0.105 0.102 0.100 0.0994.0 0.573 0.379 0.279 0.245 0.228 0.217 0.210 0.204 0.200 0.1976.0 0.859 0.569 0.419 0.368 0.341 0.325 0.314 0.307 0.301 0.2968.0 1.145 0.759 0.559 0.490 0.455 0.434 0.419 0.409 0.401 0.39410.0 1.431 0.948 0.699 0.613 0.569 0.542 0.524 0.511 0.501 0.493
