Siemens 6MD86 - Undervoltage Protection with any Voltage; Overview of Functions; Structure of the Function

Undervoltage Protection with Any Voltage
Overview of Functions
The function Undervoltage protection with any voltage (ANSI 27) detects any 1-phase undervoltage and is
intended for special applications.
Structure of the Function
The Undervoltage protection with any voltage function is used in protection function groups, which are
based on voltage measurement.
The function Undervoltage protection with any voltage comes factory-set with 2 stages. A maximum of 3
tripping stages can be operated simultaneously in the function. The tripping stages have an identical struc-
ture.
The protection function is structured such that one current-flow criterion can act on all undervoltage protec-
tion stages (see Figure 7-154).
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Figure 7-154 Structure/Embedding of the Function
7.17
7.17.1
7.17.2
Protection and Automation Functions
7.17 Undervoltage Protection with Any Voltage
818 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017