GE 869 Instruction Manual page 312

PROTECTION
4–180
Table 4-30: IEC CURVE TRIP TIMES (IN SECONDS)
MULTIPLIER CURRENT (I/I
pickup
(TDM)
1.5 2.0
IEC CURVE A
0.05 0.860 0.501
0.10 1.719 1.003
0.20 3.439 2.006
0.40 6.878 4.012
0.60 10.317 6.017
0.80 13.755 8.023
1.00 17.194 10.029 6.302
IEC CURVE B
0.05 1.350 0.675
0.10 2.700 1.350
0.20 5.400 2.700
0.40 10.800 5.400
0.60 16.200 8.100
0.80 21.600 10.800 5.400
1.00 27.000 13.500 6.750
IEC CURVE C
0.05 3.200 1.333
0.10 6.400 2.667
0.20 12.800 5.333
0.40 25.600 10.667 4.000
0.60 38.400 16.000 6.000
0.80 51.200 21.333 8.000
1.00 64.000 26.667 10.000 5.333
IEC SHORT INVERSE
0.05 0.153 0.089
0.10 0.306 0.178
0.20 0.612 0.356
0.40 1.223 0.711
0.60 1.835 1.067
0.80 2.446 1.423
1.00 3.058 1.778
IAC CURVES
The curves for the General Electric type IAC relay family are derived from the formula:
Where:
T = operate time (in seconds)
TDM = Multiplier setting
I = input current
I = Pickup Current setting
pickup
)
3.0 4.0 5.0 6.0
0.315 0.249 0.214 0.192
0.630 0.498 0.428 0.384
1.260 0.996 0.856 0.767
2.521 1.992 1.712 1.535
3.781 2.988 2.568 2.302
5.042 3.984 3.424 3.070
4.980 4.280 3.837
0.338 0.225 0.169 0.135
0.675 0.450 0.338 0.270
1.350 0.900 0.675 0.540
2.700 1.800 1.350 1.080
4.050 2.700 2.025 1.620
3.600 2.700 2.160
4.500 3.375 2.700
0.500 0.267 0.167 0.114
1.000 0.533 0.333 0.229
2.000 1.067 0.667 0.457
2.133 1.333 0.914
3.200 2.000 1.371
4.267 2.667 1.829
3.333 2.286
0.056 0.044 0.038 0.034
0.111 0.088 0.075 0.067
0.223 0.175 0.150 0.135
0.445 0.351 0.301 0.269
0.668 0.526 0.451 0.404
0.890 0.702 0.602 0.538
1.113 0.877 0.752 0.673
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
7.0 8.0 9.0 10.0
0.176 0.165 0.156 0.149
0.353 0.330 0.312 0.297
0.706 0.659 0.623 0.594
1.411 1.319 1.247 1.188
2.117 1.978 1.870 1.782
2.822 2.637 2.493 2.376
3.528 3.297 3.116 2.971
0.113 0.096 0.084 0.075
0.225 0.193 0.169 0.150
0.450 0.386 0.338 0.300
0.900 0.771 0.675 0.600
1.350 1.157 1.013 0.900
1.800 1.543 1.350 1.200
2.250 1.929 1.688 1.500
0.083 0.063 0.050 0.040
0.167 0.127 0.100 0.081
0.333 0.254 0.200 0.162
0.667 0.508 0.400 0.323
1.000 0.762 0.600 0.485
1.333 1.016 0.800 0.646
1.667 1.270 1.000 0.808
0.031 0.029 0.027 0.026
0.062 0.058 0.054 0.052
0.124 0.115 0.109 0.104
0.247 0.231 0.218 0.207
0.371 0.346 0.327 0.311
0.494 0.461 0.435 0.415
0.618 0.576 0.544 0.518