Current-Balance Supervision; Overview Of Functions; Structure Of The Function; Function Description - Siemens SIPROTEC 5 Manual

Supervision Functions
8.3 Supervision of the Secondary System
No.
_:307
_:308

Current-Balance Supervision

8.3.6

Overview of Functions

8.3.6.1
In healthy network operation, a certain balance between currents can be assumed.
The Current-balance supervision function detects the following errors:
•
Unbalance of phase currents in the secondary circuit
•
Connection errors during commissioning or short circuits and interruptions in the secondary circuit
The current measurement is based on the RMS values of the fundamental component.
8.3.6.2

Structure of the Function

The Current-balance supervision function is located in the Power-system data of each 3-phase current
measuring point.
[dwstrsym-060611-01.tif, 2, en_US]
Figure 8-15
8.3.6.3

Function Description

The current balance is checked by a magnitude monitoring function. This function relates the smallest phase
current to the largest phase current. Unbalance is detected if
|Imin| / |Imax| < Threshold min/max, as long as Imax > Release threshold.
[losymmke-040211-01.tif, 1, en_US]
Figure 8-16
384
Information
Brk.wire det.:Broken wire suspected
Brk.wire det.:Broken wire confirmed
Structure/Embedding of the Function
Characteristic of the Current-Balance Supervision
Data Class Type
(Type)
SPS O
SPS O
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017