GE 735

5-2 735/737 Feeder Protection Relay
GE Power Management
5.2 ANSI CURVES 5 OVERCURRENT CURVES
5
5.2 ANSI CURVES 5.2.1 ANSI MODERATELY INVERSE CURVES
The trip time is given by:
where: T = trip time (in seconds) A = 0.1735 (curve shape constant)
S = curve shift multiplier B = 0.6791 (curve shape constant)
M = 735/737 curve multiplier setpoint C = 0.8000 (curve shape constant)
I = input current (in amps) D = –0.0800 (curve shape constant)
Ipu = pickup current setpoint E = 0.1271 (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 9.744 1.351 0.757 0.478 0.382 0.332 0.302 0.281 0.267 0.255 0.247 0.221 0.209
2 19.489 2.702 1.515 0.955 0.764 0.665 0.604 0.563 0.533 0.511 0.493 0.442 0.417
3 29.233 4.053 2.272 1.433 1.145 0.997 0.906 0.844 0.800 0.766 0.740 0.663 0.626
4 38.977 5.404 3.030 1.910 1.527 1.329 1.208 1.126 1.066 1.021 0.986 0.884 0.835
5 48.722 6.755 3.787 2.388 1.909 1.662 1.510 1.407 1.333 1.277 1.233 1.105 1.043
6 58.466 8.106 4.544 2.866 2.291 1.994 1.812 1.689 1.600 1.532 1.479 1.326 1.252
7 68.210 9.457 5.302 3.343 2.672 2.327 2.114 1.970 1.866 1.788 1.726 1.547 1.461
8 77.954 10.807 6.059 3.821 3.054 2.659 2.416 2.252 2.133 2.043 1.972 1.768 1.669
9 87.699 12.158 6.817 4.298 3.436 2.991 2.718 2.533 2.400 2.298 2.219 1.989 1.878
10 97.443 13.509 7.574 4.776 3.818 3.324 3.020 2.815 2.666 2.554 2.465 2.210 2.087
0.5 1 4.872 0.675 0.379 0.239 0.191 0.166 0.151 0.141 0.133 0.128 0.123 0.110 0.104
2 9.744 1.351 0.757 0.478 0.382 0.332 0.302 0.281 0.267 0.255 0.247 0.221 0.209
3 14.616 2.026 1.136 0.716 0.573 0.499 0.453 0.422 0.400 0.383 0.370 0.331 0.313
4 19.489 2.702 1.515 0.955 0.764 0.665 0.604 0.563 0.533 0.511 0.493 0.442 0.417
5 24.361 3.377 1.894 1.194 0.954 0.831 0.755 0.704 0.667 0.638 0.616 0.552 0.522
6 29.233 4.053 2.272 1.433 1.145 0.997 0.906 0.844 0.800 0.766 0.740 0.663 0.626
7 34.105 4.728 2.651 1.672 1.336 1.163 1.057 0.985 0.933 0.894 0.863 0.773 0.730
8 38.977 5.404 3.030 1.910 1.527 1.329 1.208 1.126 1.066 1.021 0.986 0.884 0.835
9 43.849 6.079 3.408 2.149 1.718 1.496 1.359 1.267 1.200 1.149 1.109 0.994 0.939
10 48.722 6.755 3.787 2.388 1.909 1.662 1.510 1.407 1.333 1.277 1.233 1.105 1.043
0.8 1 7.795 1.081 0.606 0.382 0.305 0.266 0.242 0.225 0.213 0.204 0.197 0.177 0.167
2 15.591 2.161 1.212 0.764 0.611 0.532 0.483 0.450 0.427 0.409 0.394 0.354 0.334
3 23.386 3.242 1.818 1.146 0.916 0.798 0.725 0.676 0.640 0.613 0.592 0.530 0.501
4 31.182 4.323 2.424 1.528 1.222 1.064 0.967 0.901 0.853 0.817 0.789 0.707 0.668
5 38.977 5.404 3.030 1.910 1.527 1.329 1.208 1.126 1.066 1.021 0.986 0.884 0.835
6 46.773 6.484 3.636 2.292 1.833 1.595 1.450 1.351 1.280 1.226 1.183 1.061 1.002
7 54.568 7.565 4.242 2.675 2.138 1.861 1.691 1.576 1.493 1.430 1.381 1.237 1.169
8 62.364 8.646 4.847 3.057 2.443 2.127 1.933 1.802 1.706 1.634 1.578 1.414 1.335
9 70.159 9.727 5.453 3.439 2.749 2.393 2.175 2.027 1.920 1.839 1.775 1.591 1.502
10 77.954 10.807 6.059 3.821 3.054 2.659 2.416 2.252 2.133 2.043 1.972 1.768 1.669
1.1 1 10.719 1.486 0.833 0.525 0.420 0.366 0.332 0.310 0.293 0.281 0.271 0.243 0.230
2 21.437 2.972 1.666 1.051 0.840 0.731 0.664 0.619 0.587 0.562 0.542 0.486 0.459
3 32.156 4.458 2.499 1.576 1.260 1.097 0.997 0.929 0.880 0.843 0.814 0.729 0.689
4 42.875 5.944 3.333 2.101 1.680 1.462 1.329 1.239 1.173 1.124 1.085 0.972 0.918
5 53.594 7.430 4.166 2.627 2.100 1.828 1.661 1.548 1.466 1.404 1.356 1.215 1.148
6 64.312 8.916 4.999 3.152 2.520 2.194 1.993 1.858 1.760 1.685 1.627 1.458 1.377
7 75.031 10.402 5.832 3.677 2.940 2.559 2.326 2.167 2.053 1.966 1.898 1.701 1.607
8 85.750 11.888 6.665 4.203 3.360 2.925 2.658 2.477 2.346 2.247 2.169 1.945 1.836
9 96.469 13.374 7.498 4.728 3.780 3.290 2.990 2.787 2.640 2.528 2.441 2.188 2.066
10 107.187 14.860 8.332 5.253 4.200 3.656 3.322 3.096 2.933 2.809 2.712 2.431 2.295
TSMA
B
II
pu
⁄()
C
–
----------------------------
D
II
pu
⁄()
C
–
()
2
-----------------------------------
E
II
pu
⁄()
C
–
()
3
-----------------------------------
++ +



××
=