GE 869 Instruction Manual page 313

CHAPTER 4: SETPOINTS
Table 4-32: IAC CURVE TRIP TIMES (IN SECONDS)
MULTIPLIER CURRENT (I/I
(TDM)
1.5
IAC EXTREMELY INVERSE
0.5 1.699
1.0 3.398
2.0 6.796
4.0 13.591
6.0 20.387
8.0 27.183
10.0 33.979
IAC VERY INVERSE
0.5 1.451
1.0 2.901
2.0 5.802
4.0 11.605
6.0 17.407
8.0 23.209
10.0 29.012
IAC INVERSE
0.5 0.578
1.0 1.155
2.0 2.310
4.0 4.621
6.0 6.931
8.0 9.242
10.0 11.552
IAC SHORT INVERSE
0.5 0.072
1.0 0.143
2.0 0.286
4.0 0.573
6.0 0.859
8.0 1.145
10.0 1.431
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
A to E = constants
t = characteristic constant
r
T = reset time in seconds (assuming energy capacity is 100% and RESET is
RESET
"Timed")
Table 4-31: GE TYPE IAC INVERSE TIME CURVE CONSTANTS
IAC CURVE SHAPE A
IAC Extremely Inverse 0.0040
IAC Very Inverse 0.0900
IAC Inverse 0.2078
IAC Short Inverse 0.0428
)
pickup
2.0 3.0 4.0
0.749 0.303 0.178
1.498 0.606 0.356
2.997 1.212 0.711
5.993 2.423 1.422
8.990 3.635 2.133
11.987 4.846 2.844
14.983 6.058 3.555
0.656 0.269 0.172
1.312 0.537 0.343
2.624 1.075 0.687
5.248 2.150 1.374
7.872 3.225 2.061
10.497 4.299 2.747
13.121 5.374 3.434
0.375 0.266 0.221
0.749 0.532 0.443
1.499 1.064 0.885
2.997 2.128 1.770
4.496 3.192 2.656
5.995 4.256 3.541
7.494 5.320 4.426
0.047 0.035 0.031
0.095 0.070 0.061
0.190 0.140 0.123
0.379 0.279 0.245
0.569 0.419 0.368
0.759 0.559 0.490
0.948 0.699 0.613
2
I T CURVES
B C
0.6379 0.6200
0.7965 0.1000
0.8630 0.8000
0.0609 0.6200
5.0 6.0 7.0
0.123 0.093 0.074
0.246 0.186 0.149
0.491 0.372 0.298
0.983 0.744 0.595
1.474 1.115 0.893
1.966 1.487 1.191
2.457 1.859 1.488
0.133 0.113 0.101
0.266 0.227 0.202
0.533 0.453 0.405
1.065 0.906 0.810
1.598 1.359 1.215
2.131 1.813 1.620
2.663 2.266 2.025
0.196 0.180 0.618
0.392 0.360 0.337
0.784 0.719 0.674
1.569 1.439 1.348
2.353 2.158 2.022
3.138 2.878 2.695
3.922 3.597 3.369
0.028 0.027 0.026
0.057 0.054 0.052
0.114 0.108 0.105
0.228 0.217 0.210
0.341 0.325 0.314
0.455 0.434 0.419
0.569 0.542 0.524
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
8.0 9.0 10.0
0.062 0.053 0.046
0.124 0.106 0.093
0.248 0.212 0.185
0.495 0.424 0.370
0.743 0.636 0.556
0.991 0.848 0.741
1.239 1.060 0.926
0.093 0.087 0.083
0.186 0.174 0.165
0.372 0.349 0.331
0.745 0.698 0.662
1.117 1.046 0.992
1.490 1.395 1.323
1.862 1.744 1.654
0.160 0.154 0.148
0.320 0.307 0.297
0.640 0.614 0.594
1.280 1.229 1.188
1.921 1.843 1.781
2.561 2.457 2.375
3.201 3.072 2.969
0.026 0.025 0.025
0.051 0.050 0.049
0.102 0.100 0.099
0.204 0.200 0.197
0.307 0.301 0.296
0.409 0.401 0.394
0.511 0.501 0.493
4–181