Ansi Normal Inverse Curves - GE 735 Instruction Manual

5.2 ANSI 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 17.229
2 34.457
3 51.686 12.852
4 68.915 17.137
5 86.143 21.421
6 103.372 25.705 10.593
7 120.600 29.989 12.359
8 137.829 34.273 14.124
9 155.058 38.557 15.890
10 172.286 42.841 17.656
0.5 1 8.614
5
2 17.229
3 25.843
4 34.457
5 43.072 10.710
6 51.686 12.852
7 60.300 14.994
8 68.915 17.137
9 77.529 19.279
10 86.143 21.421
0.8 1 13.783
2 27.566
3 41.349 10.282
4 55.132 13.709
5 68.915 17.137
6 82.697 20.564
7 96.480 23.991
8 110.263 27.418
9 124.046 30.846 12.712
10 137.829 34.273 14.124
1.1 1 18.952
2 37.903
3 56.855 14.138
4 75.806 18.850
5 94.758 23.563
6 113.709 28.275
7 132.661 32.988 13.595
8 151.612 37.700 15.537
9 170.564 42.413 17.479
10 189.515 47.125 19.421
5-4

B
× ×

T S M A
= + --------------------------- -
( ⁄

I I
pu
1.50 2.00 3.00 4.00
4.284 1.766 0.754 0.513
8.568 3.531 1.508 1.025
5.297 2.262 1.538
7.062 3.016 2.051
8.828 3.769 2.563
4.523 3.076
5.277 3.589
6.031 4.101
6.785 4.614
7.539 5.127
2.142 0.883 0.377 0.256
4.284 1.766 0.754 0.513
6.426 2.648 1.131 0.769
8.568 3.531 1.508 1.025
4.414 1.885 1.282
5.297 2.262 1.538
6.179 2.639 1.794
7.062 3.016 2.051
7.945 3.392 2.307
8.828 3.769 2.563
3.427 1.412 0.603 0.410
6.855 2.825 1.206 0.820
4.237 1.809 1.230
5.650 2.412 1.641
7.062 3.016 2.051
8.475 3.619 2.461
9.887 4.222 2.871
11.300 4.825 3.281
5.428 3.691
6.031 4.101
4.713 1.942 0.829 0.564
9.425 3.884 1.659 1.128
5.826 2.488 1.692
7.768 3.317 2.256
9.711 4.146 2.820
11.653 4.976 3.384
5.805 3.948
6.634 4.512
7.463 5.076
8.293 5.640
735/737 Feeder Protection Relay

5.2.2 ANSI NORMAL INVERSE CURVES

D
+ ---------------------------------- - + ---------------------------------- -
) C
( ( ⁄ ) C ) ( (
2
–
I I I I
–
pu
A = 0.0274 (curve shape constant)
B = 2.2614 (curve shape constant)
C = 0.3000 (curve shape constant)
D = –4.1899 (curve shape constant)
E = 9.1272 (curve shape constant)
CURRENT (per unit I /I )
0
5.00 6.00 7.00 8.00
0.407 0.344 0.302 0.270
0.813 0.689 0.604 0.541
1.220 1.033 0.906 0.811
1.627 1.378 1.208 1.082
2.034 1.722 1.509 1.352
2.440 2.067 1.811 1.622
2.847 2.411 2.113 1.893
3.254 2.755 2.415 2.163
3.661 3.100 2.717 2.433
4.067 3.444 3.019 2.704
0.203 0.172 0.151 0.135
0.407 0.344 0.302 0.270
0.610 0.517 0.453 0.406
0.813 0.689 0.604 0.541
1.017 0.861 0.755 0.676
1.220 1.033 0.906 0.811
1.424 1.205 1.057 0.946
1.627 1.378 1.208 1.082
1.830 1.550 1.359 1.217
2.034 1.722 1.509 1.352
0.325 0.276 0.242 0.216
0.651 0.551 0.483 0.433
0.976 0.827 0.725 0.649
1.302 1.102 0.966 0.865
1.627 1.378 1.208 1.082
1.952 1.653 1.449 1.298
2.278 1.929 1.691 1.514
2.603 2.204 1.932 1.730
2.929 2.480 2.174 1.947
3.254 2.755 2.415 2.163
0.447 0.379 0.332 0.297
0.895 0.758 0.664 0.595
1.342 1.137 0.996 0.892
1.790 1.515 1.328 1.190
2.237 1.894 1.660 1.487
2.685 2.273 1.993 1.784
3.132 2.652 2.325 2.082
3.579 3.031 2.657 2.379
4.027 3.410 2.989 2.677
4.474 3.789 3.321 2.974
5 OVERCURRENT CURVES

E

⁄ ) C )

3
–
pu
9.00 10.00 15.00
0.246 0.226 0.165
0.492 0.452 0.329
0.737 0.678 0.494
0.983 0.904 0.659
1.229 1.130 0.823
1.475 1.356 0.988
1.721 1.582 1.153
1.966 1.808 1.317
2.212 2.034 1.482
2.458 2.260 1.647
0.123 0.113 0.082
0.246 0.226 0.165
0.369 0.339 0.247
0.492 0.452 0.329
0.614 0.565 0.412
0.737 0.678 0.494
0.860 0.791 0.576
0.983 0.904 0.659
1.106 1.017 0.741
1.229 1.130 0.823
0.197 0.181 0.132
0.393 0.362 0.263
0.590 0.542 0.395
0.787 0.723 0.527
0.983 0.904 0.659
1.180 1.085 0.790
1.376 1.265 0.922
1.573 1.446 1.054
1.770 1.627 1.186
1.966 1.808 1.317
0.270 0.249 0.181
0.541 0.497 0.362
0.811 0.746 0.543
1.082 0.994 0.725
1.352 1.243 0.906
1.622 1.491 1.087
1.893 1.740 1.268
2.163 1.989 1.449
2.433 2.237 1.630
2.704 2.486 1.812
GE Power Management
20.00
0.133
0.265
0.398
0.530
0.663
0.795
0.928
1.060
1.193
1.326
0.066
0.133
0.199
0.265
0.331
0.398
0.464
0.530
0.596
0.663
0.106
0.212
0.318
0.424
0.530
0.636
0.742
0.848
0.954
1.060
0.146
0.292
0.437
0.583
0.729
0.875
1.021
1.166
1.312
1.458