Structure Of The Function; Function Description - Siemens SIPROTEC 5 Manual

8.4.2.2

Structure of the Function

The Supervision of the device-internal analog-digital converters function is located in the Power-system
data function group of each 3-phase current measuring point.
[dwschstr-040211-01.tif, 1, en_US]
Figure 8-24
8.4.2.3

Function Description

Errors in the current circuits are detected if
I = |iA + iB + iC + iN| > Threshold value + Slope of the characteristic 1 •Σ| i | and
F
I > Slope of the characteristic 2 • (Σ| i | - Base point 2)
F
With the current inputs (iA, iB, iC, and iN), the device calculates:
•
The fault current I
•
The maximum current Σ| i | = |iA|+|iB|+|iC| + |iN|
[lokenisu-240413-01.tif, 2, en_US]
Figure 8-25
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
Structure/Embedding of the Function
= |iA + iB + iC + iN|
F
Characteristic Curve of the Supervision of the Device-Internal Analog-Digital Converters
Supervision Functions
8.4 Supervision of the Device Hardware
395