[dwschstr-040211-01.tif, 1, en_US]
Figure 9-38 Structure/Embedding of the Function
Function Description
Errors in the current circuits are detected if
I
F
= |iA + iB + iC + iN| > Threshold value + Slope of the characteristic 1 •Σ| i | and
I
F
> Slope of the characteristic 2 • (Σ| i | - Base point 2)
With the current inputs (iA, iB, iC, and iN), the device calculates:
•
The fault current I
F
= |iA + iB + iC + iN|
•
The maximum current Σ| i | = |iA|+|iB|+|iC| + |iN|
[lokenisu-240413-01.tif, 2, en_US]
Figure 9-39 Characteristic Curve of the Supervision of the Device-Internal Analog-Digital Converters
9.4.2.3
Supervision Functions
9.4 Supervision of the Device Hardware
1290 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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