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The following table shows the possible types of commands in a switching device and their corresponding
annunciations. For the device the messages designated with *) are displayed in the event logs, for DIGSI they
appear in spontaneous messages.
Control issued
Manual tagging (positive / negative)
Information state command, input blocking
Information state command, output blocking
Cancel command
The "plus" appearing in the message is a confirmation of the command execution. The command execution
was as expected, in other words positive. The minus sign means a negative confirmation, the command was
rejected. Possible command feedbacks and their causes are dealt with in the SIPROTEC 4 System Description.
The following figure shows operational indications relating to command execution and operation response
information for successful switching of the circuit breaker.
The check of interlocking can be programmed separately for all switching devices and tags that were set with
a tagging command. Other internal commands such as manual entry or abort are not checked, i.e. carried out
independent of the interlocking.
[leistungsschalterbetriebsmeldung-020315-wlk, 1, en_US]
Figure 2-83
Standard Interlocking (default)
The standard interlockings contain the following fixed programmed tests for each switching device, which can
be individually enabled or disabled using parameters:
•
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 (for devices without key switch by configura-
tion) is set to LOCAL.
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Type of Command
Example of an operational annunciation for switching circuit breaker 52 (Q0)
Command
Cause
Switching
CO
Manual tagging
MT
Input blocking
ST
Output blocking
ST
Cancel
CA
Functions
2.18 Breaker Control
Message
CO +/–
MT+/–
ST+/– *)
ST+/– *)
CA+/–
197
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