Siemens 6MD85, Manual

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Figure 8-17 Structure/Embedding of the Function
Function Description
Logic
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Figure 8-18 Logic Diagram of the Voltage Phase-Rotation Supervision
The phase rotation is important for protection functions which process phase, loop, and directional informa-
tion. You can set the phase sequence with the
Phase sequence
parameter in the function block General of
the power-system data (see chapter 5.1 Power-System Data ).
To supervise the phase rotation, the device compares the measured phase sequence with the set phase
sequence. For abnormal phase sequences, the indication
Failure
is generated.
The connection of the voltages to the device does not depend on the selected phase sequence. The connec-
tion diagrams are shown in chapter
A Appendix .
Release Condition
The supervision of the voltage phase rotation is carried out when all measured phase-to-phase voltages are
greater than 40 V.
8.3.7.3
Supervision Functions
8.3 Supervision of the Secondary System
958 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017