GE D90 Plus Instruction Manual page 238
Line distance protection system
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Also See for D90 Plus:
- Instruction manual (688 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (602 pages)
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GROUPED PROTECTION ELEMENTS
Multiplier
Current (I / I
pickup
(TDM)
1.5
2.0
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
228
)
3.0
4.0
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
Table 8: IEC (BS) inverse time curve constants
IEC curve shape
IEC curve A (BS142)
IEC curve B (BS142)
IEC curve C (BS142)
IEC short inverse
Table 9: IEC (BS) curve trip times (in seconds)
Multiplier
Current (I / I
(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
5.0
6.0
7.0
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
K
0.140
13.500
80.000
0.050
)
pickup
3.0
4.0
5.0
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
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
8.0
9.0
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
E
t
r
0.020
9.7
1.000
43.2
2.000
58.2
0.040
0.500
6.0
7.0
8.0
9.0
0.192
0.176
0.165
0.156
0.384
0.353
0.330
0.312
0.767
0.706
0.659
0.623
1.535
1.411
1.319
1.247
2.302
2.117
1.978
1.870
10.0
6.891
0.603
1.207
2.414
4.827
7.241
9.654
12.068
Eq. 12
Eq. 13
10.0
0.149
0.297
0.594
1.188
1.782
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