Siemens SIPROTEC 5 User Manual

Function Description
Logic
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Figure 8-22
Logic Diagram of the Current 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 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 currents to the device does not depend on the selected phase sequence. The connec-
tion diagrams are shown in the chapter A Appendix.
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
>Block function from an external or internal source
•
Via a protection pickup
The pickup signal from a protection function blocks the indication Failure .
Delay failure indication
When the device detects an inverted phase sequence for the duration of the Delay failure indication,
the indication Failure is generated.
8.3.8.3
Supervision Functions
8.3 Supervision of the Secondary System
SIPROTEC 5, Fault Recorder, Manual 391
C53000-G5040-C018-5, Edition 11.2017

Siemens SIPROTEC 5 Specifications

General

Brand	Siemens
Model	SIPROTEC 5
Category	Controller
Language	English