ABB RELION REX640, Техническое руководство, Страница: 1598 / 1960

I
ASNSCSYN
CBXCBR
CLOSE_CB
AU_CLOSE EXE_CL
SYNC_OK
SYNC_OK
Figure 876: Simplified configuration block diagram of ASNSCSYN in auto
synchronization mode operation
Alarms generation
In auto synchronization control mode, the closing command generation is activated
either by the command input
CL_COMMAND
or by command parameter
Synchronize
CB.
After the closing command activation, if the conditions for closing CB are not
fulfilled within the set time of
Maximum Syn time, a failed closing attempt alarm
is given. The
CL_FAIL_AL
alarm output signal is pulse-shaped and the pulse length
is 500 ms.
CLOSE_CB
t = Maximum Syn time
CL_FAIL_AL
t = 500 ms
CL_COMMAND or
Synchronize CB
Figure 877: Determination of checking time for closing
CB closing is permitted during Maximum Syn time, starting from the moment
the close command is activated. The close command must be active while the
closing conditions are fulfilled, otherwise the procedure is cancelled. If the closing
conditions are fulfilled during Maximum Syn time, a closing pulse output is delivered
to the CB. If the closing conditions are not fulfilled during the checking time, the
alarm
CL_FAIL_AL
is activated as an indication of a failed closing attempt. The
closing pulse is not delivered if the closing conditions become valid after
Maximum
Syn time has elapsed. The closing pulse is delivered only once for each activated
close command, and a new closing command sequence cannot be started until the
close command is reset and reactivated.
CBXCBR receives information about the CB status and thus is able to adjust
the command signal to be delivered to ASNSCSYN. If the closing command is
Control functions 1MRS759142 F
1598 REX640
Technical Manual