GE 735

5-22 735/737 Feeder Protection Relay
GE Power Management
5.5 IEC CURVES 5 OVERCURRENT CURVES
5
5.5.2 IEC A CURVES
The trip time is given by:
where: T = trip time (in seconds) K = 0.140 (curve shape constant)
S = curve shift multiplier E = 0.020 (curve shape constant)
M = 735/737 curve multiplier setpoint
I = input current (in amps)
Ipu = pickup current setpoint
S MULT CURRENT (per unit I /I
0
)– values below calculated using the IEC M value
735 IEC 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 0.1 14.340 1.718 1.002 0.632 0.499 0.428 0.383 0.351 0.328 0.309 0.295 0.251 0.228
2 0.2 28.680 3.435 2.004 1.263 0.998 0.856 0.765 0.702 0.655 0.619 0.589 0.501 0.457
3 0.3 43.020 5.153 3.007 1.895 1.497 1.284 1.148 1.053 0.983 0.928 0.884 0.752 0.685
4 0.4 57.360 6.870 4.009 2.526 1.996 1.712 1.531 1.404 1.310 1.237 1.179 1.003 0.914
5 0.5 71.700 8.588 5.011 3.158 2.495 2.139 1.913 1.755 1.638 1.546 1.473 1.253 1.142
6 0.6 86.040 10.305 6.013 3.789 2.993 2.567 2.296 2.106 1.965 1.856 1.768 1.504 1.371
7 0.7 ##### 12.023 7.016 4.421 3.492 2.995 2.679 2.457 2.293 2.165 2.063 1.755 1.599
8 0.8 ##### 13.740 8.018 5.052 3.991 3.423 3.061 2.808 2.620 2.474 2.357 2.005 1.828
9 0.9 ##### 15.458 9.020 5.684 4.490 3.851 3.444 3.159 2.948 2.783 2.652 2.256 2.056
10 1.0 ##### 17.175 10.022 6.315 4.989 4.279 3.827 3.510 3.275 3.093 2.947 2.507 2.284
0.5 1 0.1 7.170 0.859 0.501 0.316 0.249 0.214 0.191 0.176 0.164 0.155 0.147 0.125 0.114
2 0.2 14.340 1.718 1.002 0.632 0.499 0.428 0.383 0.351 0.328 0.309 0.295 0.251 0.228
3 0.3 21.510 2.576 1.503 0.947 0.748 0.642 0.574 0.527 0.491 0.464 0.442 0.376 0.343
4 0.4 28.680 3.435 2.004 1.263 0.998 0.856 0.765 0.702 0.655 0.619 0.589 0.501 0.457
5 0.5 35.850 4.294 2.506 1.579 1.247 1.070 0.957 0.878 0.819 0.773 0.737 0.627 0.571
6 0.6 43.020 5.153 3.007 1.895 1.497 1.284 1.148 1.053 0.983 0.928 0.884 0.752 0.685
7 0.7 50.190 6.011 3.508 2.210 1.746 1.498 1.339 1.229 1.146 1.082 1.031 0.877 0.800
8 0.8 57.360 6.870 4.009 2.526 1.996 1.712 1.531 1.404 1.310 1.237 1.179 1.003 0.914
9 0.9 64.530 7.729 4.510 2.842 2.245 1.925 1.722 1.580 1.474 1.392 1.326 1.128 1.028
10 1.0 71.700 8.588 5.011 3.158 2.495 2.139 1.913 1.755 1.638 1.546 1.473 1.253 1.142
0.8 1 0.1 11.472 1.374 0.802 0.505 0.399 0.342 0.306 0.281 0.262 0.247 0.236 0.201 0.183
2 0.2 22.944 2.748 1.604 1.010 0.798 0.685 0.612 0.562 0.524 0.495 0.471 0.401 0.366
3 0.3 34.416 4.122 2.405 1.516 1.197 1.027 0.918 0.842 0.786 0.742 0.707 0.602 0.548
4 0.4 45.888 5.496 3.207 2.021 1.597 1.369 1.225 1.123 1.048 0.990 0.943 0.802 0.731
5 0.5 57.360 6.870 4.009 2.526 1.996 1.712 1.531 1.404 1.310 1.237 1.179 1.003 0.914
6 0.6 68.832 8.244 4.811 3.031 2.395 2.054 1.837 1.685 1.572 1.484 1.414 1.203 1.097
7 0.7 80.304 9.618 5.612 3.536 2.794 2.396 2.143 1.966 1.834 1.732 1.650 1.404 1.279
8 0.8 91.776 10.992 6.414 4.042 3.193 2.738 2.449 2.247 2.096 1.979 1.886 1.604 1.462
9 0.9 ##### 12.366 7.216 4.547 3.592 3.081 2.755 2.527 2.358 2.227 2.122 1.805 1.645
10 1.0 ##### 13.740 8.018 5.052 3.991 3.423 3.061 2.808 2.620 2.474 2.357 2.005 1.828
1.1 1 0.1 15.774 1.889 1.102 0.695 0.549 0.471 0.421 0.386 0.360 0.340 0.324 0.276 0.251
2 0.2 31.548 3.779 2.205 1.389 1.098 0.941 0.842 0.772 0.721 0.680 0.648 0.552 0.503
3 0.3 47.322 5.668 3.307 2.084 1.646 1.412 1.263 1.158 1.081 1.021 0.972 0.827 0.754
4 0.4 63.096 7.557 4.410 2.779 2.195 1.883 1.684 1.545 1.441 1.361 1.297 1.103 1.005
5 0.5 78.870 9.446 5.512 3.473 2.744 2.353 2.105 1.931 1.801 1.701 1.621 1.379 1.256
6 0.6 94.644 11.336 6.615 4.168 3.293 2.824 2.526 2.317 2.162 2.041 1.945 1.655 1.508
7 0.7 ##### 13.225 7.717 4.863 3.842 3.295 2.947 2.703 2.522 2.381 2.269 1.930 1.759
8 0.8 ##### 15.114 8.820 5.557 4.390 3.765 3.368 3.089 2.882 2.721 2.593 2.206 2.010
9 0.9 ##### 17.004 9.922 6.252 4.939 4.236 3.789 3.475 3.242 3.062 2.917 2.482 2.262
10 1.0 ##### 18.893 11.024 6.947 5.488 4.707 4.209 3.861 3.603 3.402 3.241 2.758 2.513
TSM
K
II
pu
⁄()
E
1
–
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=