Iac Very Inverse Curves - GE 735 Instruction Manual

5.4 IAC CURVES
The trip time is given by:
where: T = trip time (in seconds)
S = curve shift multiplier
M = 735/737 curve multiplier setpoint
I = input current (in amps)
Ipu = pickup current setpoint
SHIFT CURVE
S M
1.05
1 1 8.782
2 17.564
3 26.347
4 35.129
5 43.911 14.506
6 52.693 17.407
7 61.475 20.308
8 70.257 23.209 10.497
9 79.040
10 87.822 29.012 13.121
0.5 1 4.391
5
2 8.782
3 13.173
4 17.564
5 21.955
6 26.347
7 30.738 10.154
8 35.129
9 39.520 13.055
10 43.911 14.506
0.8 1 7.026
2 14.051
3 21.077
4 28.103
5 35.129
6 42.154 13.926
7 49.180 16.247
8 56.206 18.568
9 63.232 20.889
10 70.257 23.209 10.497
1.1 1 9.660
2 19.321
3 28.981
4 38.642 12.765
5 48.302 15.956
6 57.962 19.148
7 67.623 22.339 10.103
8 77.283 25.530
9 86.944 28.722 12.990
10 96.604 31.913 14.433
5-16

× ×

T S M A
= + --------------------------- -
( ⁄

I I
pu
1.50 2.00 3.00 4.00
2.901 1.312 0.537 0.343
5.802 2.624 1.075 0.687
8.704 3.936 1.612 1.030
11.605 5.248 2.150 1.374
6.560 2.687 1.717
7.872 3.225 2.061
9.185 3.762 2.404
4.299 2.747
26.111 11.809 4.837 3.091
5.374 3.434
1.451 0.656 0.269 0.172
2.901 1.312 0.537 0.343
4.352 1.968 0.806 0.515
5.802 2.624 1.075 0.687
7.253 3.280 1.344 0.859
8.704 3.936 1.612 1.030
4.592 1.881 1.202
11.605 5.248 2.150 1.374
5.904 2.418 1.545
6.560 2.687 1.717
2.321 1.050 0.430 0.275
4.642 2.099 0.860 0.549
6.963 3.149 1.290 0.824
9.284 4.199 1.720 1.099
11.605 5.248 2.150 1.374
6.298 2.580 1.648
7.348 3.010 1.923
8.397 3.439 2.198
9.447 3.869 2.473
4.299 2.747
3.191 1.443 0.591 0.378
6.383 2.887 1.182 0.756
9.574 4.330 1.773 1.133
5.773 2.365 1.511
7.216 2.956 1.889
8.660 3.547 2.267
4.138 2.644
11.546 4.729 3.022
5.320 3.400
5.912 3.778
735/737 Feeder Protection Relay
B D
+ ---------------------------------- - + ---------------------------------- -
) C
( ( ⁄ ) C ) ( (
2
–
I I
–
pu
A = 0.090 (curve shape constant)
B = 0.796 (curve shape constant)
C = 0.100 (curve shape constant)
D = –1.289 (curve shape constant)
E = 7.959 (curve shape constant)
CURRENT (per unit I /I )
0
5.00 6.00 7.00 8.00
0.266 0.227 0.202 0.186
0.533 0.453 0.405 0.372
0.799 0.680 0.607 0.559
1.065 0.906 0.810 0.745
1.332 1.133 1.012 0.931
1.598 1.359 1.215 1.117
1.864 1.586 1.417 1.303
2.131 1.813 1.620 1.490
2.397 2.039 1.822 1.676
2.663 2.266 2.025 1.862
0.133 0.113 0.101 0.093
0.266 0.227 0.202 0.186
0.399 0.340 0.304 0.279
0.533 0.453 0.405 0.372
0.666 0.566 0.506 0.465
0.799 0.680 0.607 0.559
0.932 0.793 0.709 0.652
1.065 0.906 0.810 0.745
1.198 1.020 0.911 0.838
1.332 1.133 1.012 0.931
0.213 0.181 0.162 0.149
0.426 0.363 0.324 0.298
0.639 0.544 0.486 0.447
0.852 0.725 0.648 0.596
1.065 0.906 0.810 0.745
1.278 1.088 0.972 0.894
1.491 1.269 1.134 1.043
1.705 1.450 1.296 1.192
1.918 1.631 1.458 1.341
2.131 1.813 1.620 1.490
0.293 0.249 0.223 0.205
0.586 0.498 0.445 0.410
0.879 0.748 0.668 0.614
1.172 0.997 0.891 0.819
1.465 1.246 1.113 1.024
1.758 1.495 1.336 1.229
2.051 1.745 1.559 1.434
2.344 1.994 1.782 1.638
2.637 2.243 2.004 1.843
2.930 2.492 2.227 2.048
5 OVERCURRENT CURVES

5.4.3 IAC VERY INVERSE CURVES


E

⁄ ) C )

3
I I
–
pu
9.00 10.00 15.00
0.174 0.165 0.140
0.349 0.331 0.280
0.523 0.496 0.420
0.698 0.662 0.560
0.872 0.827 0.700
1.046 0.992 0.840
1.221 1.158 0.980
1.395 1.323 1.120
1.570 1.489 1.260
1.744 1.654 1.400
0.087 0.083 0.070
0.174 0.165 0.140
0.262 0.248 0.210
0.349 0.331 0.280
0.436 0.414 0.350
0.523 0.496 0.420
0.610 0.579 0.490
0.698 0.662 0.560
0.785 0.744 0.630
0.872 0.827 0.700
0.140 0.132 0.112
0.279 0.265 0.224
0.419 0.397 0.336
0.558 0.529 0.448
0.698 0.662 0.560
0.837 0.794 0.672
0.977 0.926 0.784
1.116 1.059 0.896
1.256 1.191 1.008
1.395 1.323 1.120
0.192 0.182 0.154
0.384 0.364 0.308
0.576 0.546 0.462
0.767 0.728 0.616
0.959 0.910 0.770
1.151 1.092 0.924
1.343 1.274 1.078
1.535 1.456 1.232
1.727 1.638 1.386
1.918 1.820 1.540
GE Power Management
20.00
0.128
0.255
0.383
0.511
0.639
0.766
0.894
1.022
1.150
1.277
0.064
0.128
0.192
0.255
0.319
0.383
0.447
0.511
0.575
0.639
0.102
0.204
0.307
0.409
0.511
0.613
0.715
0.817
0.920
1.022
0.141
0.281
0.422
0.562
0.703
0.843
0.984
1.124
1.265
1.405