ABB 615 Series ANSI, Technical Manual

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Section 7
1MAC050144-MB C
Control functions
496 615 series ANSI
Technical Manual
Figure 268: Shot pointer function
Every time the shot pointer increases, the reclaim time starts. When the reclaim time ends,
the shot pointer sets to its initial value, unless no new shot is initiated. 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.
7.2.4.4 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.
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.