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

NOTE
i
i
For current-sum supervision, the ground current of the line to be protected must be connected to the 4th
current measurement input (I
8.3.7.2

Structure of the Function

The Current-sum supervision function is located in the Power-system data of each 3-phase current meas-
urement point.
[dwstrcss-300913, 2, en_US]
Figure 8-18
8.3.7.3

Function Description

The current sum is generated by addition of the current phasors. Errors in the current circuits are detected if
IF = |IA + IB + IC + kl• IN| > Threshold + Slope factor •Σ | I |.
[lokensum-300311-01.tif, 1, en_US]
Figure 8-19
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
).
N
Structure/Embedding of the Function
Characteristic of the Current-Sum Supervision
Supervision Functions
8.3 Supervision of the Secondary System
387