Siemens 7SR51 - Logic of the Function; Application and Setting Notes

Logic of the Function
[lo_7SR5_78VSlogicdiagram, 1, en_US]
Figure 5-49
Logic Diagram: 78VS Voltage Vector Shift
Application and Setting Notes
Parameter: Element
•
Default setting: Disabled
This setting is used to allow the element to be switched on and off if it is not required. A separate setting
is provided for each element. These setting can be used to select the number of elements required.
Parameter: Setting
•
Default setting: 10°
This is the operating threshold of the element. The measured voltage vector phase shift in all 3 phases
must be above setting for operation. This should be set to suit the individual application. There is an
absolute cut-off of vector shift measurement at 30°.
Element Inhibits
In the event of an inhibit being applied by a binary input or logic signal, an element that is picked up will be
reset. Reset of the inhibit will allow restart of the operating delay.
5.26.3
5.26.4
Protection and Automation Functions
5.26 78VS Voltage Vector Shift
338 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019