Information List
No. Information Data Class
(Type)
Type
Definite-T #
_:500 VT miniatureCB:>Open SPS I
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 9-11 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
9.3.4.6
9.3.5
9.3.5.1
9.3.5.2
9.3.5.3
Supervision Functions
9.3 Supervision of the Secondary System
1258 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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