Function Description - Siemens SIPROTEC 5 Manual

8.3.8.3

Function Description

Logic
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Figure 8-22
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
To supervise the phase rotation, the device compares the measured phase sequence with the set phase
sequence. For abnormal phase sequences, the indication
The connection of the currents to the device does not depend on the selected phase sequence. The connec-
tion diagrams are shown in the chapter
Release Condition
The supervision of the current phase rotation is carried out when all measured phase currents are greater than
0.5 I .
rated
Blocking of the Function
The following blockings reset the function completely:
•
Via the binary input signal
•
Via a protection pickup
The pickup signal from a protection function blocks the indication
Delay failure indication
When the device detects an inverted phase sequence for the duration of the Delay failure indication,
the indication Failure is generated.
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
Logic Diagram of the Current Phase-Rotation Supervision
5 Power-System
A Appendix.
>Block function from an external or internal source
8.3 Supervision of the Secondary System
Data).
Failure is generated.
Failure .
Supervision Functions
391