GE 735

5-8 735/737 Feeder Protection Relay
GE Power Management
5.2 ANSI CURVES 5 OVERCURRENT CURVES
5
5.2.4 ANSI EXTREMELY INVERSE CURVES
The trip time is given by:
where: T = trip time (in seconds) A = 0.0399 (curve shape constant)
S = curve shift multiplier B = 0.2294 (curve shape constant)
M = 735/737 curve multiplier setpoint C = 0.5000 (curve shape constant)
I = input current (in amps) D = 3.0094 (curve shape constant)
Ipu = pickup current setpoint E = 0.7222 (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 14.746 4.001 1.744 0.659 0.368 0.247 0.185 0.149 0.126 0.110 0.098 0.070 0.060
2 29.492 8.002 3.489 1.319 0.736 0.495 0.371 0.298 0.251 0.219 0.196 0.141 0.119
3 44.239 12.003 5.233 1.978 1.104 0.742 0.556 0.447 0.377 0.329 0.295 0.211 0.179
4 58.985 16.004 6.977 2.638 1.472 0.990 0.742 0.596 0.503 0.439 0.393 0.281 0.239
5 73.731 20.005 8.722 3.297 1.840 1.237 0.927 0.745 0.628 0.549 0.491 0.351 0.298
6 88.477 24.005 10.466 3.956 2.208 1.484 1.113 0.894 0.754 0.658 0.589 0.422 0.358
7 103.224 28.006 12.210 4.616 2.576 1.732 1.298 1.043 0.880 0.768 0.688 0.492 0.418
8 117.970 32.007 13.955 5.275 2.944 1.979 1.483 1.192 1.006 0.878 0.786 0.562 0.477
9 132.716 36.008 15.699 5.934 3.312 2.227 1.669 1.341 1.131 0.987 0.884 0.632 0.537
10 147.462 40.009 17.443 6.594 3.680 2.474 1.854 1.491 1.257 1.097 0.982 0.703 0.597
0.5 1 7.373 2.000 0.872 0.330 0.184 0.124 0.093 0.075 0.063 0.055 0.049 0.035 0.030
2 14.746 4.001 1.744 0.659 0.368 0.247 0.185 0.149 0.126 0.110 0.098 0.070 0.060
3 22.119 6.001 2.616 0.989 0.552 0.371 0.278 0.224 0.189 0.165 0.147 0.105 0.090
4 29.492 8.002 3.489 1.319 0.736 0.495 0.371 0.298 0.251 0.219 0.196 0.141 0.119
5 36.866 10.002 4.361 1.648 0.920 0.619 0.464 0.373 0.314 0.274 0.246 0.176 0.149
6 44.239 12.003 5.233 1.978 1.104 0.742 0.556 0.447 0.377 0.329 0.295 0.211 0.179
7 51.612 14.003 6.105 2.308 1.288 0.866 0.649 0.522 0.440 0.384 0.344 0.246 0.209
8 58.985 16.004 6.977 2.638 1.472 0.990 0.742 0.596 0.503 0.439 0.393 0.281 0.239
9 66.358 18.004 7.849 2.967 1.656 1.113 0.834 0.671 0.566 0.494 0.442 0.316 0.269
10 73.731 20.005 8.722 3.297 1.840 1.237 0.927 0.745 0.628 0.549 0.491 0.351 0.298
0.8 1 11.797 3.201 1.395 0.528 0.294 0.198 0.148 0.119 0.101 0.088 0.079 0.056 0.048
2 23.594 6.401 2.791 1.055 0.589 0.396 0.297 0.238 0.201 0.176 0.157 0.112 0.095
3 35.391 9.602 4.186 1.583 0.883 0.594 0.445 0.358 0.302 0.263 0.236 0.169 0.143
4 47.188 12.803 5.582 2.110 1.177 0.792 0.593 0.477 0.402 0.351 0.314 0.225 0.191
5 58.985 16.004 6.977 2.638 1.472 0.990 0.742 0.596 0.503 0.439 0.393 0.281 0.239
6 70.782 19.204 8.373 3.165 1.766 1.188 0.890 0.715 0.603 0.527 0.472 0.337 0.286
7 82.579 22.405 9.768 3.693 2.061 1.386 1.038 0.835 0.704 0.614 0.550 0.394 0.334
8 94.376 25.606 11.164 4.220 2.355 1.583 1.187 0.954 0.804 0.702 0.629 0.450 0.382
9 106.173 28.806 12.559 4.748 2.649 1.781 1.335 1.073 0.905 0.790 0.707 0.506 0.430
10 117.970 32.007 13.955 5.275 2.944 1.979 1.483 1.192 1.006 0.878 0.786 0.562 0.477
1.1 1 16.221 4.401 1.919 0.725 0.405 0.272 0.204 0.164 0.138 0.121 0.108 0.077 0.066
2 32.442 8.802 3.838 1.451 0.809 0.544 0.408 0.328 0.277 0.241 0.216 0.155 0.131
3 48.663 13.203 5.756 2.176 1.214 0.816 0.612 0.492 0.415 0.362 0.324 0.232 0.197
4 64.883 17.604 7.675 2.901 1.619 1.089 0.816 0.656 0.553 0.483 0.432 0.309 0.263
5 81.104 22.005 9.594 3.627 2.024 1.361 1.020 0.820 0.691 0.603 0.540 0.386 0.328
6 97.325 26.406 11.513 4.352 2.428 1.633 1.224 0.984 0.830 0.724 0.648 0.464 0.394
7 113.546 30.807 13.431 5.077 2.833 1.905 1.428 1.148 0.968 0.845 0.756 0.541 0.460
8 129.767 35.208 15.350 5.803 3.238 2.177 1.632 1.312 1.106 0.966 0.864 0.618 0.525
9 145.988 39.609 17.269 6.528 3.643 2.449 1.836 1.476 1.244 1.086 0.973 0.696 0.591
10 162.208 44.010 19.188 7.253 4.047 2.722 2.040 1.640 1.383 1.207 1.081 0.773 0.656
TSMA
B
II
pu
⁄()
C
–
----------------------------
D
II
pu
⁄()
C
–
()
2
-----------------------------------
E
II
pu
⁄()
C
–
()
3
-----------------------------------
++ +



××
=