ABB Relion 670 Series Applications Manual page 303

1MRK 505 370-UUS Rev. K
The settings for the auto recloser are found under Main menu /Settings /IED Settings /Control /
AutoRecloser(79,5(0->1)) /SMBRREC(79,5(0->)):X and have been divided into four different setting
groups: General, CircuitBreaker, DeadTime and MasterSlave.
General settings
Operation: The operation of the auto recloser can be switched Enabled or Disabled.
ExternalCtrl: This setting makes it possible to switch the auto recloser On or Off using an external switch
via IO or communication ports.
ARMode: There are six different possibilities in the selection of auto reclosing programs. The type of auto
reclosing used for different kinds of faults depends on the power system configuration and the users
practices and preferences. When the circuit breaker only have three-pole operation, then three-pole auto
reclosing has to be chosen. This is usually the case in sub-transmission and distribution lines. Three-pole
tripping and reclosing for all types of faults is also widely accepted in completely meshed power systems.
In transmission systems with few parallel circuits, single-pole reclosing for single-phase faults is an
attractive alternative for maintaining service and system stability.
AutoContinue: Automatic continuation to the next shot if the circuit breaker is not closed within the set
time of tAutoContWait. The normal setting is AutoContinue = Disabled.
tAutoContWait: This is the length in time the auto recloser waits to see if the circuit breaker is closed
when AutoContinue is set to Enabled. Normally, the setting of tAutoContWait can be 2 sec.
StartByCBOpen: The normal setting Disabled is used when the function is started by protection trip
signals. If set Enabled the start of the auto recloser is controlled by an circuit breaker auxiliary contact.
LongStartInhib: Usually the protection trip command, used as an auto reclosing start signal, resets
quickly as the fault is cleared. A prolonged trip command may depend on a circuit breaker failing to clear
the fault. A protection trip signal present when the circuit breaker is reclosed will result in a new trip. The
user can set a maximum start pulse duration time tLongStartInh. This start pulse duration time is
controlled by the LongStartInhib setting. When the start pulse duration signal is longer than set maximum
start pulse duration, the auto reclosing sequence interrupts in the same way as for a signal to the
INHIBIT input.
tLongStartInh: The user can set a maximum start pulse duration time tLongStartInh. At a set time
somewhat longer than the auto reclosing dead time, this facility will not influence the auto reclosing. A
typical setting of tLongStartInh could be close to the auto reclosing dead time.
tInhibit: To ensure reliable interruption and temporary blocking of the auto recloser a resetting time delay
tInhibit is used. The auto recloser will be blocked this time after the deactivation of the INHIBIT input. A
typical resetting delay is 5.0 s.
ZoneSeqCoord: The ZONESTEP input is used when coordination between local auto reclosers and
down stream auto reclosers is needed. When this input is activated the auto recloser increases its actual
shot number by one and enters "reset time" status. If a start is received during this reclaim time the auto
recloser is proceeding as usual but with the dead time for the increased shot number. Every new
increase of the shot number needs a new activation of the ZONESTEP input. The setting NoOfShots
limits of course the possibility to increase the shot number. This functionality is controlled by the setting
ZoneSeqCoord.
CircuitBreaker settings
CBReadyType: The selection depends on the type of performance available from the circuit breaker
operating gear. At setting OCO (circuit breaker ready for an Open – Close – Open cycle), the condition is
checked only at the start of the auto reclosing cycle. The signal will disappear after tripping, but the circuit
Busbar protection REB670
Application manual
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Section 12
Control
297