From 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 861: 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 circuit breaker. 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.
The circuit breaker control function block receives information about the circuit
breaker status and thus is able to adjust the command signal to be delivered to
ASGCSYN. If the closing command is active longer than necessary, the CMD_FAIL_AL
alarm output is activated. To avoid unnecessary alarms, the maximum length of the
closing command signal should be below
Maximum Syn time
+ 5 s.
CLOSE_CB
t = Maximum Syn time
CMD_FAIL_AL
t = 5 s
CL_COMMAND or
Synchronize CB
Figure 862: Determination of the alarm limit for a still-active command signal
Control functions
1MRS759142 F
1568 REX640
Technical Manual
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General
