ABB RELION REX640 Technical Manual page 1521

1MRS759142 C
REX640
Technical Manual
GUID-BDB31C61-F77C-4AC0-A33C-4E1FE6DFBB59 V1 EN
Figure 797: 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.
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.
Section 9
Control functions
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