Siemens 6MD85, Manual

Page: 567 / 1256

Testing the Circuit-Breaker Readiness Directly before Closing
For each of the automatic reclosing cycles, you can set if a test of the circuit-breaker readiness should occur
directly before closing (parameters
CB ready check bef.close
, Figure 7-46 ). Independent of this, a test
of the circuit-breaker readiness before the start of the 1st automatic reclosing cycle can be set, see Chapter
7.2.4.5 Start and chapter 7.2.4.16 Circuit-Breaker Readiness and Circuit-Breaker Condition .
[lolsvoei-130511-01.tif, 1, en_US]
Figure 7-46 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 7-47 . 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.
[losyncro-130511-01.tif, 1, en_US]
Figure 7-47 Cyclic Reclosing Function: Logic for the Inquiry of the Synchronism
Protection and Automation Functions
7.2 Automatic Reclosing Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 567
C53000-G5040-C015-9, Edition 11.2017