GE c60 Instruction Manual page 308

GROUPED ELEMENTS
IEC (BS) curve shape
IEC Short Inverse
Table 5-30: IEC curve trip times (in seconds)
Multiplier Current ( I / I
(TDM)
1.5
IEC Curve A
0.05 0.860
0.10 1.719
0.20 3.439
0.40 6.878
0.60 10.317
0.80 13.755
1.00 17.194
IEC Curve B
0.05 1.350
0.10 2.700
0.20 5.400
0.40 10.800
0.60 16.200
0.80 21.600
5
1.00 27.000
IEC Curve C
0.05 3.200
0.10 6.400
0.20 12.800
0.40 25.600
0.60 38.400
0.80 51.200
1.00 64.000
IEC Short Inverse
0.05 0.153
0.10 0.306
0.20 0.612
0.40 1.223
0.60 1.835
0.80 2.446
1.00 3.058
IAC curves
The curves for the General Electric type IAC relay family are derived from the formulae:
TDM
T =
where
5-182
K E
0.050 0.040
)
pickup
2.0 3.0 4.0
0.501 0.315 0.249
1.003 0.630 0.498
2.006 1.260 0.996
4.012 2.521 1.992
6.017 3.781 2.988
8.023 5.042 3.984
10.029 6.302 4.980
0.675 0.338 0.225
1.350 0.675 0.450
2.700 1.350 0.900
5.400 2.700 1.800
8.100 4.050 2.700
10.800 5.400 3.600
13.500 6.750 4.500
1.333 0.500 0.267
2.667 1.000 0.533
5.333 2.000 1.067
10.667 4.000 2.133
16.000 6.000 3.200
21.333 8.000 4.267
26.667 10.000 5.333
0.089 0.056 0.044
0.178 0.111 0.088
0.356 0.223 0.175
0.711 0.445 0.351
1.067 0.668 0.526
1.423 0.890 0.702
1.778 1.113 0.877
B D

A + -------------------------- - + ---------------------------------


   C
I I     C
I I
 –
–
pkp
pkp
t
r
0.500
5.0 6.0 7.0
0.214 0.192 0.176
0.428 0.384 0.353
0.856 0.767 0.706
1.712 1.535 1.411
2.568 2.302 2.117
3.424 3.070 2.822
4.280 3.837 3.528
0.169 0.135 0.113
0.338 0.270 0.225
0.675 0.540 0.450
1.350 1.080 0.900
2.025 1.620 1.350
2.700 2.160 1.800
3.375 2.700 2.250
0.167 0.114 0.083
0.333 0.229 0.167
0.667 0.457 0.333
1.333 0.914 0.667
2.000 1.371 1.000
2.667 1.829 1.333
3.333 2.286 1.667
0.038 0.034 0.031
0.075 0.067 0.062
0.150 0.135 0.124
0.301 0.269 0.247
0.451 0.404 0.371
0.602 0.538 0.494
0.752 0.673 0.618
E

+ ---------------------------------
 ,
T
2 3
     C  RESET
I I

–
pkp
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
8.0 9.0
0.165 0.156
0.330 0.312
0.659 0.623
1.319 1.247
1.978 1.870
2.637 2.493
3.297 3.116
0.096 0.084
0.193 0.169
0.386 0.338
0.771 0.675
1.157 1.013
1.543 1.350
1.929 1.688
0.063 0.050
0.127 0.100
0.254 0.200
0.508 0.400
0.762 0.600
1.016 0.800
1.270 1.000
0.029 0.027
0.058 0.054
0.115 0.109
0.231 0.218
0.346 0.327
0.461 0.435
0.576 0.544
t
= r

TDM ---------------------------- -
2
  
1 I I
–
pkp
10.0
0.149
0.297
0.594
1.188
1.782
2.376
2.971
0.075
0.150
0.300
0.600
0.900
1.200
1.500
0.040
0.081
0.162
0.323
0.485
0.646
0.808
0.026
0.052
0.104
0.207
0.311
0.415
0.518
Eq. 5-10