Siemens siprotec SJ62 User Manual page 245

2 Functions
Figure 2-85 CFC Logic for ManCI with AR via Control
Connection to In-
ternal Synchro-
check (only 7SJ64)
Auto-Reclosing
with External Syn-
chrocheck
243
The selection list for parameter 7137 is created dynamically depending on the allocat-
ed switchgear components. If one of the switchgear components is selected, usually
the circuit breaker „52Breaker", reclosure is accomplished via control. In this case,
the automatic reclosure function does not create a close command but issues a close
request. It is forwarded to the control which then takes over the switching. Thus, the
properties defined for the switchgear component such as interlocking and command
times apply. Hence, it is possible that the close command will not be carried out due
to an applying interlocking condition.
If this behavior is not desired, the auto-reclose function can also generate the close
command „79 Close" directly which must be allocated to the associated contact.
The CFC Chart as in Figure 2-85 is not needed in this case.
The auto-reclose function can interact with the internal synchronizing function of the
7SJ64 relay. If this is desired as well as the Manual Close functionality, the CFC chart
depicted in Figure 2-85 is obligatory since the synchronizing function always works to-
gether with the control function. In addition, one of the four synchronization groups
must be selected via parameter 7138 Internal SYNC. Thus, synchronization con-
ditions for automatic reclosing are specified. The selected synchronization group
defines in that case the switchgear component to be used (usually the circuit breaker
„52Breaker"). The switchgear component defined there and the one specified at
7137 Cmd.via control must be identical. Synchronous reclosing via the close
command „79 Close" is not possible.
If interaction with the internal synchronization is not desired, the CFC Chart, as in
Figure 2-85, is not required and the parameter 7138 is set to none.
Parameter 7139 External SYNC can be set to determine that the auto-reclose func-
tion operates with external synchrocheck. External synchronization is possible if the
parameter is set to YES and 7SJ64 is linked to the external synchrocheck via the
message 2865 „79 Sync.Request" and the binary input „>Sync.release".
Note: The automatic reclosure function cannot be connected to the internal and exter-
nal synchrocheck at the same time !
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015