The shot pointer increases when the reclose time elapses or at the falling edge of
the INC_SHOTP signal.
When SHOT_PTR has the value six, the AR function is in a so called pre-lockout
state. If a new initiation occurs during the pre-lockout state, the AR function goes
to lockout. Therefore, a new sequence initiation during the pre-lockout state is not
possible.
The AR function goes to the pre-lockout state in the following cases:
• During SOTF
• When the AR function is active, it stays in a pre-lockout state for the time defined
by the reclaim time
• When all five shots have been executed
• When the frequent operation counter limit is reached. A new sequence initiation
forces the AR function to lockout.
9.4.4.4 Reclose controller
The reclose controller calculates the reclose, discrimination and reclaim times.
The reclose time is started when the INPRO signal is activated, that is, when the
sequence starts and the activated CBB defines the reclose time.
When the reclose time has elapsed, the CLOSE_CB output is not activated until the
following conditions are fulfilled:
• The SYNC input must be TRUE if the particular CBB requires information about
the synchronism
• All AR initiation inputs that are defined protection lines (using the
Control line
setting) are inactive
• The circuit breaker is open
• The circuit breaker is ready for the close command, that is, the CB_READY input is
TRUE. This is indicated by active READY output.
If at least one of the conditions is not fulfilled within the time set with the
Auto wait
time
parameter, the autoreclose sequence is locked.
The synchronism requirement for the CBBs can be defined with the
Synchronisation
set
setting, which is a bit mask. The lowest bit in the
Synchronisation set
setting is
related to CBB1 and the highest bit to CBB7. For example, if the setting is set to "1",
only CBB1 requires synchronism. If the setting is it set to "7", CBB1, CBB2 and CBB3
require the SYNC input to be TRUE before the reclosing command can be given.
1MRS758755 C
Control functions
REC615 & RER615
Technical Manual
667
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