GE Multilin 850 Instruction Manual page 251

CHAPTER 4: SETPOINTS
MULTIPLIER CURRENT (I/I
(TDM)
1.5
4.0 11.605
6.0 17.407
8.0 23.209
10.0 29.012
IAC INVERSE
0.5 0.578
1.0 1.155
2.0 2.310
4.0 4.621
6.0 6.931
8.0 9.242
10.0 11.552
IAC SHORT INVERSE
0.5 0.072
1.0 0.143
2.0 0.286
4.0 0.573
6.0 0.859
8.0 1.145
10.0 1.431
2
Table 4-33: I T CURVE TRIP TIMES (IN SECONDS)
MULTIPLIER CURRENT (I/I
(TDM)
1.5
0.01 0.44
0.10 4.44
1.00 44.44
10.00 444.44
100.00 4444.44
600.00 26666.7
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
)
pickup
2.0 3.0 4.0
5.248 2.150 1.374
7.872 3.225 2.061
10.497 4.299 2.747
13.121 5.374 3.434
0.375 0.266 0.221
0.749 0.532 0.443
1.499 1.064 0.885
2.997 2.128 1.770
4.496 3.192 2.656
5.995 4.256 3.541
7.494 5.320 4.426
0.047 0.035 0.031
0.095 0.070 0.061
0.190 0.140 0.123
0.379 0.279 0.245
0.569 0.419 0.368
0.759 0.559 0.490
0.948 0.699 0.613
2
I T CURVES
2
The curves for the I t are derived from the formula:
Where:
T = operate time (in seconds)
TDM = Multiplier setting
I = input current
I = Pickup Current setting
pickup
T = reset time in seconds (assuming energy capacity is 100% and RESET is
RESET
"Timed")
)
pickup
2.0 3.0 4.0
0.25 0.11 0.06
2.50 1.11 0.63
25.00 11.11 6.25
250.00 111.11 62.50
2500.00 1111.1 625.00
15000.0 6666.7 3750.0
5.0 6.0 7.0
1.065 0.906 0.810
1.598 1.359 1.215
2.131 1.813 1.620
2.663 2.266 2.025
0.196 0.180 0.618
0.392 0.360 0.337
0.784 0.719 0.674
1.569 1.439 1.348
2.353 2.158 2.022
3.138 2.878 2.695
3.922 3.597 3.369
0.028 0.027 0.026
0.057 0.054 0.052
0.114 0.108 0.105
0.228 0.217 0.210
0.341 0.325 0.314
0.455 0.434 0.419
0.569 0.542 0.524
5.0 6.0 7.0
0.04 0.03 0.02
0.40 0.28 0.20
4.00 2.78 2.04
40.00 27.78 20.41
400.00 277.78 204.08
2400.0 1666.7 1224.5
PROTECTION
8.0 9.0 10.0
0.745 0.698 0.662
1.117 1.046 0.992
1.490 1.395 1.323
1.862 1.744 1.654
0.160 0.154 0.148
0.320 0.307 0.297
0.640 0.614 0.594
1.280 1.229 1.188
1.921 1.843 1.781
2.561 2.457 2.375
3.201 3.072 2.969
0.026 0.025 0.025
0.051 0.050 0.049
0.102 0.100 0.099
0.204 0.200 0.197
0.307 0.301 0.296
0.409 0.401 0.394
0.511 0.501 0.493
8.0 9.0 10.0
0.02 0.01 0.01
0.16 0.12 0.10
1.56 1.23 1.00
15.63 123.5 10.00
156.25 123.46 100.00
937.50 740.74 600.00
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