Logic Of The Function; Application And Setting Notes - Siemens 7SR51 Device Manual

Protection and Automation Functions
5.21 55 Power Factor

Logic of the Function

5.21.3
[lo_7SR5_55logicdiagram, 1, en_US]
Figure 5-33

Application and Setting Notes

5.21.4
Parameter: Operation
•
Default setting: Under
Each element can be individually set to indicate operation when the power factor is above or below the
set threshold. Normal system operating conditions generally have a power factor approaching unity and
an Under-PF element will operate to indicate unwanted conditions. An Over-PF element is useful to
provide an operated indication during normal healthy conditions.
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Logic Diagram: 55 Power Factor
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019