GE M60 Instruction Manual page 337

CHAPTER 5: SETTINGS
Table 5-29: 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
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
1.00 27.000 13.500
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
0.60 38.400 16.000
0.80 51.200 21.333
1.00 64.000 26.667
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 formulae:

A + -------------------------- -
TDM

T = 
 
I I

pkp
where
T = operate time (in seconds)
TDM = Multiplier setting
I = Input current
I = Pickup Current setting
pkp
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
)
3.0 4.0 5.0
0.315 0.249 0.214
0.630 0.498 0.428
1.260 0.996 0.856
2.521 1.992 1.712
3.781 2.988 2.568
5.042 3.984 3.424
6.302 4.980 4.280
0.338 0.225 0.169
0.675 0.450 0.338
1.350 0.900 0.675
2.700 1.800 1.350
4.050 2.700 2.025
5.400 3.600 2.700
6.750 4.500 3.375
0.500 0.267 0.167
1.000 0.533 0.333
2.000 1.067 0.667
4.000 2.133 1.333
6.000 3.200 2.000
8.000 4.267 2.667
10.000 5.333 3.333
0.056 0.044 0.038
0.111 0.088 0.075
0.223 0.175 0.150
0.445 0.351 0.301
0.668 0.526 0.451
0.890 0.702 0.602
1.113 0.877 0.752
B D
+ --------------------------------- + ---------------------------------
2
 C
    C    
I I I I
–
–
pkp
6.0 7.0
0.192 0.176
0.384 0.353
0.767 0.706
1.535 1.411
2.302 2.117
3.070 2.822
3.837 3.528
0.135 0.113
0.270 0.225
0.540 0.450
1.080 0.900
1.620 1.350
2.160 1.800
2.700 2.250
0.114 0.083
0.229 0.167
0.457 0.333
0.914 0.667
1.371 1.000
1.829 1.333
2.286 1.667
0.034 0.031
0.067 0.062
0.135 0.124
0.269 0.247
0.404 0.371
0.538 0.494
0.673 0.618
E

 ,
T =
3 TDM
 C  RESET

–
pkp
GROUPED ELEMENTS
8.0 9.0 10.0
0.165 0.156 0.149
0.330 0.312 0.297
0.659 0.623 0.594
1.319 1.247 1.188
1.978 1.870 1.782
2.637 2.493 2.376
3.297 3.116 2.971
0.096 0.084 0.075
0.193 0.169 0.150
0.386 0.338 0.300
0.771 0.675 0.600
1.157 1.013 0.900
1.543 1.350 1.200
1.929 1.688 1.500
0.063 0.050 0.040
0.127 0.100 0.081
0.254 0.200 0.162
0.508 0.400 0.323
0.762 0.600 0.485
1.016 0.800 0.646
1.270 1.000 0.808
0.029 0.027 0.026
0.058 0.054 0.052
0.115 0.109 0.104
0.231 0.218 0.207
0.346 0.327 0.311
0.461 0.435 0.415
0.576 0.544 0.518
t
Eq. 5-33
r

---------------------------- -
2
  
1 I I
–
pkp
5-209
5