# GE L60 Instruction Manual Page 303

Line phase comparison system, ur series.

5 SETTINGS
IEC CURVES
For European applications, the relay offers three standard curves defined in IEC 255-4 and British standard BS142. These
are defined as IEC Curve A, IEC Curve B, and IEC Curve C. The formulae for these curves are:
T
=
where: T = operate time (in seconds), TDM = Multiplier setting, I = input current, I
constants, t
= characteristic constant, and T
r
and
is "Timed")
RESET
Table 5–18: IEC (BS) INVERSE TIME CURVE CONSTANTS
IEC (BS) CURVE SHAPE
IEC Curve A (BS142)
IEC Curve B (BS142)
IEC Curve C (BS142)
IEC Short Inverse
Table 5–19: IEC CURVE TRIP TIMES (IN SECONDS)
MULTIPLIER
(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 TIME
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
GE Multilin
K
-------------------------------------- -
E
×
TDM
,
T
(
I I
)
1
RESET
pickup
RESET
K
E
0.140
0.020
13.500
1.000
80.000
2.000
0.050
0.040
CURRENT ( I / I
3.0
4.0
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
L60 Line Phase Comparison System
t
r
-------------------------------------- -
×
TDM
2
=
(
)
1
I I
pickup
pickup
= reset time in seconds (assuming energy capacity is 100%
T
R
9.7
43.2
58.2
0.500
)
pickup
5.0
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
5.5 GROUPED ELEMENTS
(EQ 5.11)
= Pickup Current setting, K, E =
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
5-165
5