Siemens SIPROTEC 6MD665, Manual

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2 Functions
22
6MD665 Manual
C53000-G1876-C103-3
The following table shows some types of commands to switchgear and the accompa-
nying indications. For the device the indications designated with *) are displayed in the
event logs, for DIGSI
®
they appear in spontaneous indications.
The "plus" appearing in the indication is a confirmation of the command execution. The
command output has a positive result, as expected. The "minus" is a negative confir-
mation and means that the result was unexpected. The command was rejected.
The check of interlocking can be programmed separately for all switchgear and tags
that were set with a tagging command. Other internal commands such as overriding
or abort are not tested, i.e. are executed independently of the interlockings.
Figure 2-1 Example of an operational annunciation for switching circuit breaker 52
Standard Interlocking Defaults (fixed programming)
The Standard Interlocking Conditions comprehends as a default and for each switch-
gear the following checks which can be enabled or disabled individually via parame-
ters:
• Device Status Check (setpoint = 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 applies whether switch interlocking is activated or
deactivated.
• System Interlocking: For checking the system interlocking a locally issued
command to the central unit is instigated with switching authority = local. A switch-
ing device that is subject to system interlocking cannot be switched by DIGSI
®
.
• Bay Interlocking: Logic combinations deposited in the device using CFC are
scanned and taken into consideration for interlocked switching. We distinguish
between remote interlockings which can be deactivated and remote interlockings
which cannot be deactivated. Remote interlockings which cannot be deactivated
are considered in any case, also in case of unlocked control.
• Double operation locking: Parallel switchings are mutually interlocked; when a
switching is being processed a second one cannot be executed.
Type of command Control Cause Indication
Control issued Switching CO CO+/–
Manual tagging (positive / nega-
tive) Override MT MT+/–
Output blocking, Acquisition block-
ing Input blocking IB ST+/– *)
Output blocking Binary Output
Blocking OB ST+/– *)
Cancel command Cancel CA CA+/–