CHAPTER 5: SETPOINTS
5.4 PROTECTION ELEMENTS
GEK-106310-AF
F650 DIGITAL BAY CONTROLLER
5-49
5.4.2.2 IEC curves
This family of curves follows the European standard IEC 255-4, and the British standard BF142 for IEC Curves A, B and C,
IEC Long-Time Inverse and IEC Short-Time Inverse. The formulas that define these curves are as follows:
Where:
t = Operation time in seconds
Dial = multiplying factor
I = Input current
Itap = Current pickup value
K, E = constants defined by the standard
T
RESET
= reset time in seconds (assuming 100% of power capacity and that the reset is activated)
t
r
= characteristic constant.
Table 5-23: Constants for IEC curves
8.0
129.432
56.221
23.538
14.387
10.465
8.410
7.196
6.418
5.889
5.513
10.0
161.790
70.277
29.423
17.983
13.081
10.513
8.995
8.023
7.361
6.891
IEEE Inverse
0.5
3.220
1.902
1.216
0.973
0.844
0.763
0.706
0.663
0.630
0.603
1.0
6.439
3.803
2.432
1.946
1.688
1.526
1.412
1.327
1.260
1.207
2.0
12.878
7.606
4.864
3.892
3.377
3.051
2.823
2.653
2.521
2.414
4.0
25.756
15.213
9.729
7.783
6.753
6.102
5.647
5.307
5.041
4.827
6.0
38.634
22.819
14.593
11.675
10.130
9.153
8.470
7.960
7.562
7.241
8.0
51.512
30.426
19.458
15.567
13.507
12.204
11.294
10.614
10.083
9.654
10.0
64.390
38.032
24.322
19.458
16.883
15.255
14.117
13.267
12.604
12.068
IEC Curve Shape
Name
K
E
tr
IEC Curve A
IEC Curve A
0.140
0.020
9.7
IEC Curve B
IEC Curve B
13.500
1.000
43.2
IEC Curve C
IEC Curve C
80.000
2.000
58.2
IEC Long-Time Inverse
IEC Long-Time Inv
120.000
1.000
120.0
IEC Short-Time Inverse
IEC Short-Time Inv
0.050
0.040
0.5
Summary of Contents for F650
Page 406: ...6 58 F650 DIGITAL BAY CONTROLLER GEK 106310 AF 6 5 RECORDS CHAPTER 6 ACTUAL VALUES ...
Page 994: ...H 2 F650 DIGITAL BAY CONTROLLER GEK 106310 AF APPENDIX H FACTORY DEFAULT LOGIC ...
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