Functions
2.19 Synchronization Function
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
313
With AR
The automatic reclosing (AR) function can also interact with the synchronizing function. They are linked via the
device control. The selection is made via parameter setting of the automatic reclosing function. The AR param-
eters (7138 Internal SYNC) determine which SYNC function group (SYNC FG) is used. The applicable
switch is defined in the selected function group. The switchgear component indicated in the AR parameters
(7137 Cmd.via control) and the selected SYNC function group should be identical. If their settings differ,
the SYNC function group setting will overwrite that of the AR function. If no SYNC function group is entered in
the AR parameter, the close command of the auto reclose function is carried out in unsynchronized form via
the switchgear component indicated in the AR parameters. Equally, the close command „79 Close“ (mes-
sage 2851) allows only unsynchronized switching. If e.g. circuit breaker Q0 is configured as component to be
switched synchronized, a CLOSE command of the AR function will address this breaker and assign it a CLOSE
command which will be processed by the control. As this breaker requires synchronization, the control launches
the synchronizing function and awaits release. If the configured conditions are fulfilled, the release is granted
and the control issues the CLOSE command (see Figure 2-119).
Figure 2-119 Connection of the automatic reclosing function to the synchronization function
With External Control
As another option the synchronizing function can be activated via external measurement request. The synchro-
nizing function can be started via binary input using a measurement request („>25 Sync req.“ or pulse-like
start and stop signals „>25 Start“ „>25 Stop“). After the synchronizing function has completed the check,
it issues a release message („25 CloseRelease“see Figure 2-120). Measurement is finished as soon as
the measurement request is reset via the binary input. In this case there is no need to configure any control
device to be synchronized.
Figure 2-120 Interaction of synchronizing function and external control
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