Siemens 7SJ82, Manual

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Figure 6-312 Cyclic Reclosing Function: Logic for the Query of the Circuit-Breaker Readiness Directly before
Closing
Synchrocheck
For each of the configured automatic reclosing cycles, you can set if a synchrocheck should be executed and
which functionality should be used here, see
Figure 6-313 . You may only use the internal synchrocheck if the
device is connected to a voltage transformer.
Alternatively, you can also connect an external device with synchrocheck through a binary input.
The measuring request for the synchrocheck is placed if the optional test of the circuit-breaker readiness was
positive. The measuring request for the synchrocheck exists until the synchrocheck assigns the allowance for
the closure. If the allowance is not given within the set maximum dead time extension, the closure will be
cancelled through the blocking of the automatic reclosing function. The minimum duration of the measuring
request is 50 ms.
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Figure 6-313 Cyclic Reclosing Function: Logic for the Inquiry of the Synchronism
Close Command
As soon as the test of the circuit-breaker readiness and the synchrocheck deliver a positive result, the closing
indication will be created. It will be assigned for 100 ms. The actual close command is not created by the auto-
matic reclosing function, but rather from the circuit-breaker function block outside of the automatic reclosing
function. Here the set maximum duration of the close command is also considered.
Protection and Automation Functions
6.45 Automatic Reclosing Function
SIPROTEC 5, Overcurrent Protection, Manual 907
C53000-G5040-C017-8, Edition 07.2017