GE L30 Instruction Manual page 431
Line current differential system
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CHAPTER 5: SETTINGS
Multiplier
Current ( I / I
pickup
(TDM)
1.5
2.0
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:
where
T = operate time (in seconds)
TDM = Multiplier setting
I = Input current
I
= Pickup Current setting
pkp
A to E = constants defined in the table
t
= characteristic constant defined in the table
r
T
= reset time in seconds (assuming energy capacity is 100% and RESET is "Timed")
RESET
Table 5-33: GE type IAC inverse time curve constants
IAC curve shape
IAC Extreme Inverse
IAC Very Inverse
IAC Inverse
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
)
3.0
4.0
5.0
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
A
B
C
0.0040
0.6379
0.6200
0.0900
0.7955
0.1000
0.2078
0.8630
0.8000
6.0
7.0
8.0
3.837
3.528
3.297
0.135
0.113
0.096
0.270
0.225
0.193
0.540
0.450
0.386
1.080
0.900
0.771
1.620
1.350
1.157
2.160
1.800
1.543
2.700
2.250
1.929
0.114
0.083
0.063
0.229
0.167
0.127
0.457
0.333
0.254
0.914
0.667
0.508
1.371
1.000
0.762
1.829
1.333
1.016
2.286
1.667
1.270
0.034
0.031
0.029
0.067
0.062
0.058
0.135
0.124
0.115
0.269
0.247
0.231
0.404
0.371
0.346
0.538
0.494
0.461
0.673
0.618
0.576
D
E
1.7872
0.2461
–1.2885
7.9586
–0.4180
0.1947
GROUPED ELEMENTS
9.0
10.0
3.116
2.971
0.084
0.075
0.169
0.150
0.338
0.300
0.675
0.600
1.013
0.900
1.350
1.200
1.688
1.500
0.050
0.040
0.100
0.081
0.200
0.162
0.400
0.323
0.600
0.485
0.800
0.646
1.000
0.808
0.027
0.026
0.054
0.052
0.109
0.104
0.218
0.207
0.327
0.311
0.435
0.415
0.544
0.518
Eq. 5-16
t
r
6.008
4.678
0.990
5-217
5
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