Voltage-Sum Supervision; Overview Of Functions; Structure Of The Function; Function Description - Siemens SIPROTEC 5 Manual

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Voltage-Sum Supervision

8.3.3

Overview of Functions

8.3.3.1
In healthy system operation, the sum of all voltages at one measuring point must be approximately 0. The
Voltage-sum supervision monitors the sum of all voltages of one measuring point in the secondary circuit. It
detects connection errors during commissioning or short circuits and interruptions in the secondary circuit. For
summation of the voltages, the 3 phase-to-ground voltages and the residual voltage (da-dn - voltage of an
open-circuited delta winding) are required.
The voltage measurement is based on the RMS values of the fundamental component.
NOTE
i
i
For the Voltage-sum supervision, the externally generated residual voltage must be connected to the 4th
voltage measuring input.
For the Voltage-sum supervision to work correctly, the Matching ratio Vph / VN parameter must be
set accordingly.
8.3.3.2

Structure of the Function

The Voltage-sum supervision function is located in the Power-system data function group of each 3-phase
voltage measuring point.
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Figure 8-8
8.3.3.3

Function Description

The voltage sum is generated by addition of the voltage phasors. Errors in the voltage circuits are detected if
VF = |VA+ VB + VC + Vph/VN • VN | > Threshold, where Vph/VN forms the Matching ratio Vph / VN
parameter.
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
Information
Supv. balan. V:Health
Supv. balan. V:Failure
Structure/Embedding of the Function
Supervision Functions
8.3 Supervision of the Secondary System
Data Class Type
(Type)
ENS O
SPS O
375