•
Device Status Check (set = actual): The switching command is rejected, and an error indication is
displayed if the circuit breaker is already in the set position. (If this check is enabled, then it works
whether interlocking, e.g. zone controlled, is activated or deactivated.) This condition is checked in both
interlocked and non-interlocked status modes.
•
System Interlocking: To check the power system interlocking, a local command is transmitted to the
central unit with Switching Authority = LOCAL. A switching device that is subject to system interlocking
cannot be switched by DIGSI.
•
Zone Controlled / Bay Interlocking: Logic links in the device which were created via CFC are interrogated
and considered during interlocked switching.
•
Blocking by Protection: Switch-ON commands are rejected with interlocked switches, as soon as one of
the protection functions of the unit has opened a fault case. The OPEN-command, by contrast, can
always be executed. Please be aware, activation of thermal overload protection elements or sensitive
ground fault detection can create and maintain a fault condition status, and can therefore block CLOSE
commands.
•
Double Operation Block: Parallel switching operations are interlocked against one another; while one
command is processed, a second cannot be carried out.
•
Switching Authority LOCAL: A control command from the user interface of the device (command with
command source LOCAL) is only allowed if the Key Switch (by configuration) is set to LOCAL.
•
Switching Authority DIGSI: Switching commands that are issued locally or remotely via DIGSI (command
with command source DIGSI) are only allowed if remote control is admissible for the device (by configu-
ration). If a DIGSI-PC communicates with the device, it deposits here its virtual device number (VD). Only
commands with this VD (when Switching Authority = REMOTE) will be accepted by the device. Remote
switching commands will be rejected.
•
Switching authority REMOTE: A remote switch command (command with source REMOTE) is only
allowed if remote control is enabled at the device (by configuration).
Functions
2.24 Breaker Control
SIPROTEC 4, 7SJ80, Manual 303
E50417-G1140-C343-A8, Edition 12.2017
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