14.2.2.2 Initiate auto reclosing and conditions for start of a reclosing cycle
M12391-94 v5
The usual way to start an auto reclosing cycle, or sequence, is to start it at selective
tripping by line protection by applying a signal to the RI input. Starting signals can be
either, general trip signals or
, only the conditions for differential, distance protection
zone 1 and distance protection aided trip. In some cases also directional ground fault
protection aided trip can be connected to start an auto reclose attempt. If general trip is
used to start the auto recloser it is important to block it from other functions that should
not start an auto reclosing sequence.
In cases where one wants to differentiate three-phase auto reclosing dead time, for
different power system configuration or at tripping by different protection stages, one
can also use the RI_HS input (initiate high-speed reclosing). When initiating RI_HS,
the auto reclosing dead time for three-phase shot 1, t1 3PhHS is used and the closing is
done without checking the synchrocheck condition.
A number of conditions need to be fulfilled for the start to be accepted and a new auto
reclosing cycle to be started. They are linked to dedicated inputs. The inputs are:
• CBREADY, circuit breaker ready for a reclosing cycle, for example, charged
operating gear.
• CBCLOSED to ensure that the circuit breaker was closed when the line fault
occurred and start was applied.
• No signal at INHIBIT input that is, no blocking or inhibit signal present. After the
start has been accepted, it is latched in and an internal signal “start” is set. It can be
interrupted by certain events, like an “inhibit” signal.
14.2.2.3 Initiate auto reclosing from circuit breaker open information
M12391-100 v6
If a user wants to initiate auto reclosing from the circuit breaker open position instead
of from protection trip signals, the function offers such a possibility. This starting mode
is selected with the setting parameter StartByCBOpen=Enabled. Typically a circuit
breaker auxiliary contact of type NO (normally open) is connected to CBCLOSED and
RI. When the signal changes from circuit breaker closed to circuit breaker open an auto
reclosing start pulse is generated and latched in the function, subject to the usual
checks. The auto reclosing sequence continues then as usual. Signals from manual
tripping and other functions, which shall prevent auto reclosing, need to be connected
to the INHIBIT input.
14.2.2.4 Blocking of the auto recloser
M12391-103 v4
Auto reclose attempts are expected to take place only for faults on the own line. The
auto recloser must be blocked by activating the INHIBIT input for the following
conditions:
Section 14 1MRK 511 401-UUS A
Control
328 Bay control REC670 2.2 ANSI
Application manual
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