Siemens siprotec SJ62 User Manual page 293

2 Functions
With AR
With External
Control
291
The automatic reclosing (AR) function can also interact with the synchronizing func-
tion. They are linked via the device control. The selection is made via parameter
setting of the automatic reclosing function. The AR parameters (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 pa-
rameter, the close command of the auto reclose function is carried out in unsynchro-
nized form via the switchgear component indicated in the AR parameters. Equally, the
close command „79 Close" (message 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 synchroni-
zation, the control launches the synchronizing function and awaits release. If the con-
figured conditions are fulfilled, the release is granted and the control issues the
CLOSE command (see Figure 2-103).
Figure 2-103 Connection of the automatic reclosing function to the synchrocheck
As another option the synchronizing function can be activated via external measure-
ment request. The synchronizing function can be started via binary input using a mea-
surement request („>25 Measu. Only" 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 2-104). 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 2-104 Interaction of synchronizing function and external control
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015