GE D90 Plus Instruction Manual page 197
Line distance protection system
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- Instruction manual (694 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (688 pages)
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CHAPTER 7: PROTECTION
Table 7-1: 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
10.0
64.390
38.032
IEC curves
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
)
3.0
4.0
1.823
1.001
3.647
2.002
7.293
4.003
14.587
8.007
21.880
12.010
29.174
16.014
36.467
20.017
1.471
0.899
2.942
1.798
5.885
3.597
11.769
7.193
17.654
10.790
23.538
14.387
29.423
17.983
1.216
0.973
2.432
1.946
4.864
3.892
9.729
7.783
14.593
11.675
19.458
15.567
24.322
19.458
For European applications, the D90
and British standard BS142. These are defined as IEC curves A, B, and C. The IEC curves are
derived by the operate and reset time equations.
The terms in the above equations are defined as follows.
•
T
represents the operate time in seconds.
operate
•
TDM represents the multiplier setting.
•
I represents the input current.
•
I
represents the pickup current setting value.
pickup
•
K and E are constants and are defined in the table below.
•
T
represents reset time in seconds, assuming the energy capacity is 100% and the
reset
reset mode is timed.
•
t
represents the characteristic constant and is defined in the table below.
r
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
Plus
offers three standard curves defined in IEC 255-4
GROUPED PROTECTION ELEMENTS
8.0
9.0
10.0
0.285
0.237
0.203
0.569
0.474
0.407
1.139
0.948
0.813
2.277
1.897
1.626
3.416
2.845
2.439
4.555
3.794
3.252
5.693
4.742
4.065
0.401
0.368
0.345
0.802
0.736
0.689
1.605
1.472
1.378
3.209
2.945
2.756
4.814
4.417
4.134
6.418
5.889
5.513
8.023
7.361
6.891
0.663
0.630
0.603
1.327
1.260
1.207
2.653
2.521
2.414
5.307
5.041
4.827
7.960
7.562
7.241
10.614
10.083
9.654
13.267
12.604
12.068
Eq. 10
Eq. 11
189
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