MofPU = 1 bis 1.94 MofPU = 2 bis 4.75 MofPU = 5 bis 7.75 MofPU = 8 bis 20
1.31 1.81 3.25 4.75 6.25 7.75 13.00 20.00
1.38 1.88 14.00
1.44 1.94
The value pairs are entered at address 1531 MofPU Res T/Tp to recreate the reset curve. The following
must be observed:
•
The current values entered should be those from Table 2-9, along with the matching times. Deviating
values Ι/Ιp are rounded. This, however, will not be indicated.
Current flows greater than the highest current value entered will not lead to a prolongation of the reset
time. The reset curve (see Figure 2-18, left side) is parallel to the current axis, beginning with the largest
current point.
Current flows which are less than the smallest current value entered will not lead to a reduction of the
reset time. The reset curve (see Figure 2-18, left side) is parallel to the current axis, beginning with the
smallest current point.
Table 2-10 Preferential values of standardized currents for user-defined dropout curves
MofPU = 1 bis 0.86 MofPU = 0.84 bis 0.67 MofPU = 0.66 bis 0.38 MofPU = 0.34 bis 0.00
1.00 0.93 0.84 0.75 0.66 0.53 0.34 0.16
0.99 0.92 0.83 0.73 0.64 0.50 0.31 0.13
0.98 0.91 0.81 0.72 0.63 0.47 0.28 0.09
0.97 0.90 0.80 0.70 0.61 0.44 0.25 0.06
0.96 0.89 0.78 0.69 0.59 0.41 022 0.03
0.95 0.88 0.77 0.67 0.56 0.38 0.19 0.00
0.94 0.86
[anwenderkennl-260602-kn, 1, en_US]
Figure 2-35 Using a user-defined curve
Inrush Restraint
When applying the protection device to transformers where high inrush currents are to be expected, the
7SJ62/64 can make use of an inrush restraint function for the directional overcurrent elements 67-1
PICKUP, 67-TOC PICKUP, 67N-1 PICKUP and 67N-TOC PICKUP as well as the non-directional overcur-
rent elements. The inrush restraint option is enabled or disabled in 2201 INRUSH REST. (in the settings
option non-directional time overcurrent protection). The characteristic values of the inrush restraint are
already listed in the section discussing the non-directional time overcurrent (Section 2.2.11 Setting Notes).
Functions
2.3 Directional Overcurrent Protection 67, 67N
104 SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
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