Functions
2.4 Command Processing
SIPROTEC, 7SC805, Manual
C53000-G1140-C380-1, Release date 05.2014
55
Switching Mode
The switching mode serves for activating or deactivating the configured interlocking conditions at the time of
the switching operation.
The following (local) switching modes are defined:
• For local commands (CS = LOCAL)
- interlocked (normal) or
- unlocked (non-interlocked)
With a 7SC805, the switching mode can be changed between "interlocked" and "unlocked" in the Web Monitor
after having entered the password, or by means of CFC also via binary inputs and a function key.
The following (remote) switching modes are defined:
• For remote or DIGSI commands (CS = LOCAL, REMOTE or DIGSI)
- interlocked or
- unlocked (non-interlocked). Here, bypassing the interlocking is accomplished via a separate unlocking
command.
- For commands from CFC (CS = Auto), please observe the notes in the CFC manual (component: BOOL
to command).
Zone Controlled/Field Interlocking
Zone controlled / field interlocking (e.g. via CFC) includes the verification that predetermined switchgear posi-
tion conditions are satisfied to prevent switching errors (e.g. disconnector vs. ground switch, ground switch only
if no voltage applied) as well as verification of the state of other mechanical interlocking in the switchgear bay
(e.g. High Voltage compartment doors).
Interlocking conditions can be programmed separately, for each switching device, for device control CLOSE
and/or OPEN.
The enable information with the data "switching device is interlocked (OFF/NV/FLT) or enabled (ON)" can be
set up,
• directly, using a single point or double point indication, key-switch, or internal indication (marking), or
• by means of a control logic via CFC.
When a switching command is initiated, the actual status is scanned cyclically. The assignment is done via "Re-
lease object CLOSE/OPEN".
System Interlocking
Substation Controller (System interlocking) involves switchgear conditions of other bays evaluated by a central
control system.
Double Activation Blockage
Parallel switching operations are interlocked. As soon as the command has arrived all command objects
subject to the interlocking are checked to know whether a command is being processed. While the command
is being executed, interlocking is enabled for other commands.
Device Status Check (set = actual)
For switching commands, a check takes place whether the selected switching device is already in the set/de-
sired position (set/actual comparison). This means, if a circuit breaker is already in the CLOSED position and
an attempt is made to issue a closing command, the command will be refused, with the operating message "set
