GE 735

5-4 735/737 Feeder Protection Relay
GE Power Management
5.2 ANSI CURVES 5 OVERCURRENT CURVES
5
5.2.2 ANSI NORMAL INVERSE CURVES
The trip time is given by:
where: T = trip time (in seconds) A = 0.0274 (curve shape constant)
S = curve shift multiplier B = 2.2614 (curve shape constant)
M = 735/737 curve multiplier setpoint C = 0.3000 (curve shape constant)
I = input current (in amps) D = –4.1899 (curve shape constant)
Ipu = pickup current setpoint E = 9.1272 (curve shape constant)
SHIFT
S
CURVE
M
CURRENT (per unit I /I
0
)
1.05 1.50 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00
1 1 17.229 4.284 1.766 0.754 0.513 0.407 0.344 0.302 0.270 0.246 0.226 0.165 0.133
2 34.457 8.568 3.531 1.508 1.025 0.813 0.689 0.604 0.541 0.492 0.452 0.329 0.265
3 51.686 12.852 5.297 2.262 1.538 1.220 1.033 0.906 0.811 0.737 0.678 0.494 0.398
4 68.915 17.137 7.062 3.016 2.051 1.627 1.378 1.208 1.082 0.983 0.904 0.659 0.530
5 86.143 21.421 8.828 3.769 2.563 2.034 1.722 1.509 1.352 1.229 1.130 0.823 0.663
6 103.372 25.705 10.593 4.523 3.076 2.440 2.067 1.811 1.622 1.475 1.356 0.988 0.795
7 120.600 29.989 12.359 5.277 3.589 2.847 2.411 2.113 1.893 1.721 1.582 1.153 0.928
8 137.829 34.273 14.124 6.031 4.101 3.254 2.755 2.415 2.163 1.966 1.808 1.317 1.060
9 155.058 38.557 15.890 6.785 4.614 3.661 3.100 2.717 2.433 2.212 2.034 1.482 1.193
10 172.286 42.841 17.656 7.539 5.127 4.067 3.444 3.019 2.704 2.458 2.260 1.647 1.326
0.5 1 8.614 2.142 0.883 0.377 0.256 0.203 0.172 0.151 0.135 0.123 0.113 0.082 0.066
2 17.229 4.284 1.766 0.754 0.513 0.407 0.344 0.302 0.270 0.246 0.226 0.165 0.133
3 25.843 6.426 2.648 1.131 0.769 0.610 0.517 0.453 0.406 0.369 0.339 0.247 0.199
4 34.457 8.568 3.531 1.508 1.025 0.813 0.689 0.604 0.541 0.492 0.452 0.329 0.265
5 43.072 10.710 4.414 1.885 1.282 1.017 0.861 0.755 0.676 0.614 0.565 0.412 0.331
6 51.686 12.852 5.297 2.262 1.538 1.220 1.033 0.906 0.811 0.737 0.678 0.494 0.398
7 60.300 14.994 6.179 2.639 1.794 1.424 1.205 1.057 0.946 0.860 0.791 0.576 0.464
8 68.915 17.137 7.062 3.016 2.051 1.627 1.378 1.208 1.082 0.983 0.904 0.659 0.530
9 77.529 19.279 7.945 3.392 2.307 1.830 1.550 1.359 1.217 1.106 1.017 0.741 0.596
10 86.143 21.421 8.828 3.769 2.563 2.034 1.722 1.509 1.352 1.229 1.130 0.823 0.663
0.8 1 13.783 3.427 1.412 0.603 0.410 0.325 0.276 0.242 0.216 0.197 0.181 0.132 0.106
2 27.566 6.855 2.825 1.206 0.820 0.651 0.551 0.483 0.433 0.393 0.362 0.263 0.212
3 41.349 10.282 4.237 1.809 1.230 0.976 0.827 0.725 0.649 0.590 0.542 0.395 0.318
4 55.132 13.709 5.650 2.412 1.641 1.302 1.102 0.966 0.865 0.787 0.723 0.527 0.424
5 68.915 17.137 7.062 3.016 2.051 1.627 1.378 1.208 1.082 0.983 0.904 0.659 0.530
6 82.697 20.564 8.475 3.619 2.461 1.952 1.653 1.449 1.298 1.180 1.085 0.790 0.636
7 96.480 23.991 9.887 4.222 2.871 2.278 1.929 1.691 1.514 1.376 1.265 0.922 0.742
8 110.263 27.418 11.300 4.825 3.281 2.603 2.204 1.932 1.730 1.573 1.446 1.054 0.848
9 124.046 30.846 12.712 5.428 3.691 2.929 2.480 2.174 1.947 1.770 1.627 1.186 0.954
10 137.829 34.273 14.124 6.031 4.101 3.254 2.755 2.415 2.163 1.966 1.808 1.317 1.060
1.1 1 18.952 4.713 1.942 0.829 0.564 0.447 0.379 0.332 0.297 0.270 0.249 0.181 0.146
2 37.903 9.425 3.884 1.659 1.128 0.895 0.758 0.664 0.595 0.541 0.497 0.362 0.292
3 56.855 14.138 5.826 2.488 1.692 1.342 1.137 0.996 0.892 0.811 0.746 0.543 0.437
4 75.806 18.850 7.768 3.317 2.256 1.790 1.515 1.328 1.190 1.082 0.994 0.725 0.583
5 94.758 23.563 9.711 4.146 2.820 2.237 1.894 1.660 1.487 1.352 1.243 0.906 0.729
6 113.709 28.275 11.653 4.976 3.384 2.685 2.273 1.993 1.784 1.622 1.491 1.087 0.875
7 132.661 32.988 13.595 5.805 3.948 3.132 2.652 2.325 2.082 1.893 1.740 1.268 1.021
8 151.612 37.700 15.537 6.634 4.512 3.579 3.031 2.657 2.379 2.163 1.989 1.449 1.166
9 170.564 42.413 17.479 7.463 5.076 4.027 3.410 2.989 2.677 2.433 2.237 1.630 1.312
10 189.515 47.125 19.421 8.293 5.640 4.474 3.789 3.321 2.974 2.704 2.486 1.812 1.458
TSMA
B
II
pu
⁄()
C
–
----------------------------
D
II
pu
⁄()
C
–
()
2
-----------------------------------
E
II
pu
⁄()
C
–
()
3
-----------------------------------
++ +



××
=