Siemens SIPROTEC 4 7SJ61 Manual page 64

Functions
2.2 Overcurrent Protection 50, 51, 50N, 51N
Table 2-3
MofPU = 1 bis 1.94
1.00 1.50
1.06 1.56
1.13 1.63
1.19 1.69
1.25 1.75
1.31 1.81
1.38 1.88
1.44 1.94
[anwenderkennl-260602-kn, 1, en_US]
Figure 2-15
The value pairs are entered at address 1231 MofPU Res T/Tp or 1331 MofPU Res T/TEp to recreate the
reset curve. The following must be observed:
•
The current values entered should be those from the following
Deviating values of MofPU are rounded. This, however, will not be indicated.
Currents larger than the largest current value entered will not lead to an extension of the dropout time.
The dropout curve (see
value point.
Currents which are smaller than the smallest current value entered will not lead to a reduction of the
dropout time. The dropout curve (see
with the smallest curve value point.
Table 2-4
.MofPU = 1 bis 0.86
1.00 0.93
0.99 0.92
0.98 0.91
0.97 0.90
0.96 0.89
0.95 0.88
0.94 0.86
When using DIGSI to make settings, a dialog box opens where you can enter up to 20 value pairs (measured
quantity and trip time) (see
64
Preferential values of standardized currents for user-defined tripping curves
MofPU = 2 bis 4.75
2.00 3.50
2.25 3.75
2.50 4.00
2.75 4.25
3.00 4.50
3.25 4.75
Using a user-defined curve
Figure 2-15, left side) runs parallel to the current axis, up to the largest curve
Preferential values of standardized currents for user-defined reset curves
MofPU = 0.84 bis 0.67
0.84 0.75
0.83 0.73
0.81 0.72
0.80 0.70
0.78 0.69
0.77 0.67
Figure 2-16).
MofPU = 5 bis 7.75
5.00
5.25
5.50
5.75
6.00
6.25
Table
Figure 2-15, left side) runs parallel to the current axis, beginning
MofPU = 0.66 bis 0.38
0.66 0.53
0.64 0.50
0.63 0.47
0.61 0.44
0.59 0.41
0.56 0.38
MofPU = 8 bis 20
6.50 8.00
6.75 9.00
7.00 10.00
7.25 11.00
7.50 12.00
7.75 13.00
14.00
2-4, along with the matching times.
MofPU = 0.34 bis 0.00
0.34
0.31
0.28
0.25
0.22
0.19
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016
15.00
16.00
17.00
18.00
19.00
20.00
0.16
0.13
0.09
0.06
0.03
0.00