Logic of the Function
[lo_7SR5_81logicdiagram, 1, en_US]
Figure 5-42
Logic Diagram: 81 Frequency Protection – "f>" or "f<"
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:
Input Selection
•
Default setting:
VT1/2/3
Each 81 element can be individually set to measure frequency from the 3 phase VT inputs or single phase
VT input.
Parameter:
Operation
•
Default setting:
Under
Each 81 element can be individually set to be either an underfrequency or overfrequency element.
5.20.3
5.20.4
Protection and Automation Functions
5.20 81 Frequency Protection – "f>" or "f<"
Reyrolle 7SR5, Transformer Protection Device, Device Manual
289
C53000-G7040-C015-1, Edition 11.2019
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