GE b30 Instruction Manual page 339
Bus differential system
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CHAPTER 5: SETTINGS
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 curves. The IEEE curves are derived from the operate and reset time equations.
where
T = operate time (in seconds)
TDM = Multiplier setting
I = input current
I
= Pickup Current setting
pickup
A, B, p = constants defined in the table
T
= reset time in seconds (assuming energy capacity is 100% and RESET is "Timed")
RESET
t
= characteristic constant defined in the table
r
Table 5-24: IEEE inverse time curve constants
IEEE curve shape
IEEE Extremely Inverse
IEEE Very Inverse
IEEE Moderately Inverse
Table 5-25: IEEE curve trip times (in seconds)
Multiplier
Current ( I / I
pickup
(TDM)
1.5
2.0
IEEE Extremely Inverse
0.5
11.341
4.761
1.0
22.682
9.522
2.0
45.363
19.043
4.0
90.727
38.087
6.0
136.090
57.130
8.0
181.454
76.174
10.0
226.817
95.217
IEEE Very Inverse
0.5
8.090
3.514
1.0
16.179
7.028
2.0
32.358
14.055
4.0
64.716
28.111
6.0
97.074
42.166
8.0
129.432
56.221
10.0
161.790
70.277
IEEE Moderately Inverse
0.5
3.220
1.902
1.0
6.439
3.803
2.0
12.878
7.606
4.0
25.756
15.213
6.0
38.634
22.819
8.0
51.512
30.426
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
A
B
28.2
0.1217
19.61
0.491
0.0515
0.1140
)
3.0
4.0
5.0
1.823
1.001
0.648
3.647
2.002
1.297
7.293
4.003
2.593
14.587
8.007
5.187
21.880
12.010
7.780
29.174
16.014
10.374
36.467
20.017
12.967
1.471
0.899
0.654
2.942
1.798
1.308
5.885
3.597
2.616
11.769
7.193
5.232
17.654
10.790
7.849
23.538
14.387
10.465
29.423
17.983
13.081
1.216
0.973
0.844
2.432
1.946
1.688
4.864
3.892
3.377
9.729
7.783
6.753
14.593
11.675
10.130
19.458
15.567
13.507
p
t
r
2.0000
29.1
2.0000
21.6
0.02000
4.85
6.0
7.0
8.0
0.464
0.355
0.285
0.927
0.709
0.569
1.855
1.418
1.139
3.710
2.837
2.277
5.564
4.255
3.416
7.419
5.674
4.555
9.274
7.092
5.693
0.526
0.450
0.401
1.051
0.900
0.802
2.103
1.799
1.605
4.205
3.598
3.209
6.308
5.397
4.814
8.410
7.196
6.418
10.513
8.995
8.023
0.763
0.706
0.663
1.526
1.412
1.327
3.051
2.823
2.653
6.102
5.647
5.307
9.153
8.470
7.960
12.204
11.294
10.614
GROUPED ELEMENTS
Eq. 5-5
9.0
10.0
0.237
0.203
0.474
0.407
0.948
0.813
1.897
1.626
2.845
2.439
3.794
3.252
4.742
4.065
0.368
0.345
0.736
0.689
1.472
1.378
2.945
2.756
4.417
4.134
5.889
5.513
7.361
6.891
0.630
0.603
1.260
1.207
2.521
2.414
5.041
4.827
7.562
7.241
10.083
9.654
5-173
5
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