Siemens 6MD86 - Voltage-Balance Supervision; Overview of Functions; Structure of the Function; Function Description

Voltage-Balance Supervision
Overview of Functions
In healthy system operation, a certain balance between voltages can be assumed.
The Voltage-balance supervision function detects the following errors:
•
Unbalance of phase-to-phase voltages in the secondary circuit
•
Connection errors during commissioning or short circuits and interruptions in the secondary circuit
The voltage measurement is based on the RMS values of the fundamental component.
Structure of the Function
The Voltage-balance supervision function is located in the Power-system data of each 3-phase voltage
measuring point.
[dwstrusy-300913, 2, en_US]
Figure 8-11 Structure/Embedding of the Function
Function Description
The voltage balance is checked by a magnitude supervision function. This function relates the smallest phase-
to-phase voltage to the largest phase phase-to-phase voltage. Unbalance is detected if
|Vmin| / |Vmax| < Threshold min/max, as long as Vmax > Release threshold
[lokenuns-040211-01.tif, 1, en_US]
Figure 8-12 Characteristic of the Voltage-Balance Supervision
8.3.5
8.3.5.1
8.3.5.2
8.3.5.3
Supervision Functions
8.3 Supervision of the Secondary System
952 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017