Functions
2.18 Breaker Control
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
219
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.
Figure 2-83
Example of an operational annunciation for switching circuit breaker 52 (Q0)
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-in-
terlocked 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 de-
tection can create and maintain a fault condition status, and can therefore block CLOSE commands. If the
interlocking is removed, consider that, on the other hand, the restart inhibit for motors will not automatically
reject a CLOSE command to the motor. Therefore, a restart inhibit must be provided by other means, e.g.
by a bay interlocking using CFC.
• 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 via 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 key switch
or configuration). 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 control command (command with command source REMOTE) is
only allowed if the Key Switch (for devices without key switch via configuration) is set to REMOTE.
