GE L60 Instruction Manual page 302

Line phase comparison system, ur series
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5.5 GROUPED ELEMENTS
IEEE CURVES:
The IEEE time overcurrent curve shapes conform to industry standards and the IEEE C37.112-1996 curve classifications
for extremely, very, and moderately inverse. The IEEE curves are derived from the formulae:
where: T = operate time (in seconds), TDM = Multiplier setting, I = input current, I
A, B, p = constants, T
t
= characteristic constant
r
Table 5–16: IEEE INVERSE TIME CURVE CONSTANTS
IEEE CURVE SHAPE
IEEE Extremely Inverse
IEEE Very Inverse
IEEE Moderately Inverse
Table 5–17: IEEE CURVE TRIP TIMES (IN SECONDS)
MULTIPLIER
(TDM)
1.5
IEEE EXTREMELY INVERSE
5
0.5
11.341
1.0
22.682
2.0
45.363
4.0
90.727
6.0
136.090
8.0
181.454
10.0
226.817
IEEE VERY INVERSE
0.5
8.090
1.0
16.179
2.0
32.358
4.0
64.716
6.0
97.074
8.0
129.432
10.0
161.790
IEEE MODERATELY INVERSE
0.5
3.220
1.0
6.439
2.0
12.878
4.0
25.756
6.0
38.634
8.0
51.512
10.0
64.390
5-164
A
--------------------------------- -
B
+
p
I
T
TDM
×
=
--------------- -
1
I
pickup
= reset time in seconds (assuming energy capacity is 100% and
RESET
A
28.2
0.1217
19.61
0.491
0.0515
0.1140
2.0
3.0
4.0
4.761
1.823
1.001
9.522
3.647
2.002
19.043
7.293
4.003
38.087
14.587
8.007
57.130
21.880
12.010
76.174
29.174
16.014
95.217
36.467
20.017
3.514
1.471
0.899
7.028
2.942
1.798
14.055
5.885
3.597
28.111
11.769
7.193
42.166
17.654
10.790
56.221
23.538
14.387
70.277
29.423
17.983
1.902
1.216
0.973
3.803
2.432
1.946
7.606
4.864
3.892
15.213
9.729
7.783
22.819
14.593
11.675
30.426
19.458
15.567
38.032
24.322
19.458
L60 Line Phase Comparison System
t
----------------------------------- -
T
TDM
×
,
=
RESET
--------------- -
1
I
pickup
pickup
B
P
T
R
2.0000
29.1
2.0000
21.6
0.02000
4.85
CURRENT ( I / I
)
pickup
5.0
6.0
7.0
0.648
0.464
0.355
1.297
0.927
0.709
2.593
1.855
1.418
5.187
3.710
2.837
7.780
5.564
4.255
10.374
7.419
5.674
12.967
9.274
7.092
0.654
0.526
0.450
1.308
1.051
0.900
2.616
2.103
1.799
5.232
4.205
3.598
7.849
6.308
5.397
10.465
8.410
7.196
13.081
10.513
8.995
0.844
0.763
0.706
1.688
1.526
1.412
3.377
3.051
2.823
6.753
6.102
5.647
10.130
9.153
8.470
13.507
12.204
11.294
16.883
15.255
14.117
5 SETTINGS
r
I
2
= Pickup Current setting
is "Timed"),
RESET
8.0
9.0
0.285
0.237
0.569
0.474
1.139
0.948
2.277
1.897
3.416
2.845
4.555
3.794
5.693
4.742
0.401
0.368
0.802
0.736
1.605
1.472
3.209
2.945
4.814
4.417
6.418
5.889
8.023
7.361
0.663
0.630
1.327
1.260
2.653
2.521
5.307
5.041
7.960
7.562
10.614
10.083
13.267
12.604
(EQ 5.10)
10.0
0.203
0.407
0.813
1.626
2.439
3.252
4.065
0.345
0.689
1.378
2.756
4.134
5.513
6.891
0.603
1.207
2.414
4.827
7.241
9.654
12.068
GE Multilin

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