GE C70 Instruction Manual page 395
Capacitor bank protection
and control system
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CHAPTER 5: SETTINGS
Multiplier
Current ( I / I
pickup
(TDM)
1.5
2.0
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
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 IEC curves are derived by the operate and reset time
equations.
where
T = operate time (in seconds)
TDM = Multiplier setting
I = input current
I
= Pickup Current setting
pickup
K, E = constants defined in the table
t
= characteristic constant defined in the table
r
T
= reset time in seconds (assuming energy capacity is 100% and
RESET
Table 5-27: 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 5-28: IEC curve trip times (in seconds)
Multiplier
Current ( I / I
pickup
(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
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
)
3.0
4.0
5.0
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
24.322
19.458
16.883
K
E
t
r
0.140
0.020
9.7
13.500
1.000
43.2
80.000
2.000
58.2
0.050
0.040
0.500
)
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
5.042
3.984
3.424
6.0
7.0
8.0
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
15.255
14.117
13.267
is "Timed")
RESET
6.0
7.0
8.0
0.192
0.176
0.165
0.384
0.353
0.330
0.767
0.706
0.659
1.535
1.411
1.319
2.302
2.117
1.978
3.070
2.822
2.637
GROUPED ELEMENTS
9.0
10.0
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
12.604
12.068
Eq. 5-8
9.0
10.0
0.156
0.149
0.312
0.297
0.623
0.594
1.247
1.188
1.870
1.782
2.493
2.376
5-191
5
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