GE 735 User Manual

5-18 735/737 Feeder Protection Relay
GE Power Management
5.4 IAC CURVES 5 OVERCURRENT CURVES
5
5.4.4 IAC EXTREMELY INVERSE CURVES
The trip time is given by:
where: T = trip time (in seconds) A = 0.004 (curve shape constant)
S = curve shift multiplier B = 0.638 (curve shape constant)
M = 735/737 curve multiplier setpoint C = 0.620 (curve shape constant)
I = input current (in amps) D = 1.787 (curve shape constant)
Ipu = pickup current setpoint E = 0.246 (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 14.249 3.398 1.498 0.606 0.356 0.246 0.186 0.149 0.124 0.106 0.093 0.057 0.042
2 28.497 6.796 2.997 1.212 0.711 0.491 0.372 0.298 0.248 0.212 0.185 0.114 0.083
3 42.746 10.194 4.495 1.817 1.067 0.737 0.558 0.447 0.372 0.318 0.278 0.171 0.125
4 56.994 13.591 5.993 2.423 1.422 0.983 0.744 0.595 0.495 0.424 0.370 0.228 0.167
5 71.243 16.989 7.492 3.029 1.778 1.229 0.929 0.744 0.619 0.530 0.463 0.285 0.209
6 85.491 20.387 8.990 3.635 2.133 1.474 1.115 0.893 0.743 0.636 0.556 0.343 0.250
7 99.740 23.785 10.488 4.241 2.489 1.720 1.301 1.042 0.867 0.742 0.648 0.400 0.292
8 113.989 27.183 11.987 4.846 2.844 1.966 1.487 1.191 0.991 0.848 0.741 0.457 0.334
9 128.237 30.581 13.485 5.452 3.200 2.212 1.673 1.340 1.115 0.954 0.834 0.514 0.375
10 142.486 33.979 14.983 6.058 3.555 2.457 1.859 1.488 1.239 1.060 0.926 0.571 0.417
0.5 1 7.124 1.699 0.749 0.303 0.178 0.123 0.093 0.074 0.062 0.053 0.046 0.029 0.021
2 14.249 3.398 1.498 0.606 0.356 0.246 0.186 0.149 0.124 0.106 0.093 0.057 0.042
3 21.373 5.097 2.248 0.909 0.533 0.369 0.279 0.223 0.186 0.159 0.139 0.086 0.063
4 28.497 6.796 2.997 1.212 0.711 0.491 0.372 0.298 0.248 0.212 0.185 0.114 0.083
5 35.621 8.495 3.746 1.514 0.889 0.614 0.465 0.372 0.310 0.265 0.232 0.143 0.104
6 42.746 10.194 4.495 1.817 1.067 0.737 0.558 0.447 0.372 0.318 0.278 0.171 0.125
7 49.870 11.893 5.244 2.120 1.244 0.860 0.651 0.521 0.434 0.371 0.324 0.200 0.146
8 56.994 13.591 5.993 2.423 1.422 0.983 0.744 0.595 0.495 0.424 0.370 0.228 0.167
9 64.119 15.290 6.743 2.726 1.600 1.106 0.837 0.670 0.557 0.477 0.417 0.257 0.188
10 71.243 16.989 7.492 3.029 1.778 1.229 0.929 0.744 0.619 0.530 0.463 0.285 0.209
0.8 1 11.399 2.718 1.199 0.485 0.284 0.197 0.149 0.119 0.099 0.085 0.074 0.046 0.033
2 22.798 5.437 2.397 0.969 0.569 0.393 0.297 0.238 0.198 0.170 0.148 0.091 0.067
3 34.197 8.155 3.596 1.454 0.853 0.590 0.446 0.357 0.297 0.254 0.222 0.137 0.100
4 45.595 10.873 4.795 1.939 1.138 0.786 0.595 0.476 0.396 0.339 0.296 0.183 0.133
5 56.994 13.591 5.993 2.423 1.422 0.983 0.744 0.595 0.495 0.424 0.370 0.228 0.167
6 68.393 16.310 7.192 2.908 1.707 1.179 0.892 0.714 0.595 0.509 0.445 0.274 0.200
7 79.792 19.028 8.391 3.392 1.991 1.376 1.041 0.833 0.694 0.594 0.519 0.320 0.234
8 91.191 21.746 9.589 3.877 2.275 1.573 1.190 0.953 0.793 0.678 0.593 0.365 0.267
9 102.590 24.465 10.788 4.362 2.560 1.769 1.338 1.072 0.892 0.763 0.667 0.411 0.300
10 113.989 27.183 11.987 4.846 2.844 1.966 1.487 1.191 0.991 0.848 0.741 0.457 0.334
1.1 1 15.673 3.738 1.648 0.666 0.391 0.270 0.204 0.164 0.136 0.117 0.102 0.063 0.046
2 31.347 7.475 3.296 1.333 0.782 0.541 0.409 0.327 0.272 0.233 0.204 0.126 0.092
3 47.020 11.213 4.945 1.999 1.173 0.811 0.613 0.491 0.409 0.350 0.306 0.188 0.138
4 62.694 14.951 6.593 2.665 1.564 1.081 0.818 0.655 0.545 0.466 0.408 0.251 0.184
5 78.367 18.688 8.241 3.332 1.955 1.351 1.022 0.819 0.681 0.583 0.509 0.314 0.229
6 94.041 22.426 9.889 3.998 2.347 1.622 1.227 0.982 0.817 0.700 0.611 0.377 0.275
7 109.714 26.164 11.537 4.665 2.738 1.892 1.431 1.146 0.954 0.816 0.713 0.440 0.321
8 125.387 29.901 13.185 5.331 3.129 2.162 1.636 1.310 1.090 0.933 0.815 0.502 0.367
9 141.061 33.639 14.834 5.997 3.520 2.433 1.840 1.474 1.226 1.049 0.917 0.565 0.413
10 156.734 37.377 16.482 6.664 3.911 2.703 2.045 1.637 1.362 1.166 1.019 0.628 0.459
TSMA
B
II
pu
⁄()
C
–
----------------------------
D
II
pu
⁄()
C
–
()
2
-----------------------------------
E
II
pu
⁄()
C
–
()
3
-----------------------------------
++ +
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
××
=

GE 735 Specifications

General

Brand	GE
Model	735
Category	Relays
Language	English