Areva MiCOM P441, Техническое руководство

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P44x/EN AP/E33 Application Notes
Page 142/220 MiCOM P441/P442 & P444
CB Discrepancy
The DDB CB Discrepancy if assigned to an opto input in the PSL and when energized, will
inform the protection about a pole Discrepancy status. 1 pole opened and two other poles
closed. Must be Set to high logical level before Dead time 1 is issued (see Figure 83) -can
be generated also internally (see Figure 85 and Figure 109 Cbaux logic).
External TripA
External TripB
External TripC
From External Protection Devices (via Opto Inputs)- see General trip logic Figure 94.
Opto inputs are assigned as External Trip A, External Trip B and External Trip C (external
Trip Order issued by main 2 or in order to initiate the internal AR backup protection).
External trip is integrated in the DDB: Any Trip. No Dwell timer is associated as for an
internal trip (see Figure 94: trip logic).
4.5.7 Logical Outputs generated by the Autoreclose logic
The following DDB signals can be masked to a relay contact in the PSL or assigned to a
Monitor Bit in Commissioning Tests, to provide information about the status of the
autoreclose cycle. These are described below, identified by their DDB signal text.
AR Lockout Shot>
Indicates an unsuccessful autoreclose (definitive trip following the last AR shot). The relay
will be driven to lockout and the autoreclose function will be disabled until the lockout
condition has been reset. An alarm, "AR Lockout Shots>" (along with AR Lockout) will be
raised. – (see Figure 79 and Figure 81)
AR Fail
If the check sync conditions are not meet prior to reclose within the time window, an alarm
"AR Fail" will be raised. (see Figure 78)
AR Close
Initiates the reclosing command pulse for the circuit breaker. This output feeds a signal to
the Reclose Time Delay timer, which maintains the assigned reclose contact closed for a
sufficient time period to ensure reliable CB mechanism operation. This DDB signal may also
be useful during relay commissioning to check the operation of the autoreclose cycle.
Where three single pole circuit breakers are used, the AR Close contact will need to
energise the closing circuits for all three breaker poles (or alternatively assign three CB
Close contacts). (See Figure 78)
AR 1P In Prog.
A single pole autoreclose cycle is in progress. This output will remain activated from the
initiating protection trip, until the circuit breaker is closed successfully, or the AR function is
Locked Out, thus indicating that dead time timeout is in progress. This signal may be useful
during relay commissioning to check the operation of the autoreclose cycle.