Siemens SIPROTEC 6MD665, Manual

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2.7 Circuit breaker synchronisation
53
6MD665 Manual
C53000-G1876-C103-3
Field of application
external control,
internal synchroni-
sation The 6MD665 also enable the synchronisation via an external control and internal syn-
chronisation.
To directly connect an external control (e.g. AR), the setting of the control device to
be synchronised must be set to low.
At the time of the switching operation, the module selection can be controlled dynam-
ically via the Sync. effective input message. The Sync. effective input message can
be configured to a binary input, CFC or IRC. Unsynchronised switching is performed
if no synchronisation function is effective (Sync. effective OFF).
In this case, the contact between the control and the synchronisation function is per-
formed internally via messages:
•
´!6\0HDVµ
(Measurement request), on binary input
•
´6\QF&ORVH5HOµ
, on relay (for outputting the switch-on command)
•
´6\QFV\QFKURQµ
, to relay
Subfunctions The synchronisation check is composed of the two subfunctions control and synchro-
nisation.
• The control function ensures the coordination of the complete command proce-
dure:
– Coordination of the different switching directions
– Standard interlockings such as timeout protection
– Command connection/disconnection of the command relays
– Command logging CO+/-, FB+/- and COE.
– Feedback to the operator (operator response).
• The Synchronisation function processes the measuring phase of:
–
´!6\0HDVµ
(Measurement request), start of measurement, to
–
´6\QF&ORVH5HOµ
, switching release.
Command process-
ing phases with
synchrocheck Depending on the setting and the current process condition, the individual phases of
the command processing are executed, skipped or the command processing is
aborted. When integrating the synchronisation procedure into a switching sequence,
the deselection phases must be processed correspondingly also in case of an abort.
• Voltage application: The voltage application (applying measured values at the
time of the switching operation) is optional. It is, for example, set via a switching
sequence in CFC. The corresponding measured values must be switched to the
device analogue inputs via relays.
• Selection of the SYNC function group(if necessary): The SYNC function group
selection (selection of a function module with its settings and messages) is optional.
The selection is only required if several SYNC function modules are actually
switched active. It is, for example, set via a switching sequence in CFC. The selec-
tion is performed by activating the input indication
´!6\HIIµ
effective.
• Switchgear interlocking: This phase executes the control subfunction. It serves to
execute all switchgear interlocking checks and to state if switching is permitted or
not.
In additon to this, it is checked if maximally one synchronisation function (measuring
phase) is active.
• Checking start conditions: This phase executes the control subfunction. A check
determines whether switching is to occur with or without synchronisation. It serves