Apparatus Control Apc - ABB REQ650 Applications Manual

1MRK 505 383-UEN A
9.3
Breaker protection REQ650 2.2 IEC
Application manual
permissive (not strict) line protection scheme, for instance a power line carrier
(PLC) link, may not always be available. If lost, it can result in delayed tripping at
one end of a line. There is a possibility to extend the auto reclosing dead time in
such a case by use of the PLCLOST input, and the tExtended t1 setting. Typical
setting in such a case: Extended t1 = On and tExtended t1 = 0.8 s.
t1 3PhHS: There is also a separate time setting facility for three-phase high-speed
auto reclosing, t1 3PhHS. This high-speed auto reclosing is activated by the
STARTHS input and is used when auto reclosing is done without the requirement of
synchrocheck conditions to be fulfilled. A typical dead time is 400ms.
t2 3Ph, t3 3Ph, t4 3Ph, t5 3Ph: The delay of auto reclosing shot two and possible
later shots are usually set at 30s or more. A check that the circuit breaker duty
cycle can manage the selected setting must be done. The setting can in some cases
be restricted by national regulations. For multiple shots the setting of shots two to
five must be longer than the circuit breaker duty cycle time.
MasterSlave settings
Priority: In single circuit breaker applications, one sets Priority = None. At
sequential reclosing the auto recloser for the first circuit breaker, e.g. near the
busbar, is set as master (High) and the auto recloser for the second circuit breaker
is set as slave (Low).
tWaitForMaster: The slave should take the duration of the circuit breaker closing
time of the master into consideration before sending the circuit breaker closing
command. A setting tWaitForMaster sets a maximum wait time for the WAIT input
to reset. If the wait time expires, the auto reclosing cycle of the slave is inhibited.
The maximum wait time, tWaitForMaster for the second circuit breaker is set
longer than the auto reclosing dead time plus a margin for synchrocheck conditions
to be fulfilled for the first circuit breaker. Typical setting is 2sec.
tSlaveDeadTime: When activating the WAIT input, in the auto recloser set as slave,
every dead timer is changed to the value of setting tSlaveDeadTime and holds back
the auto reclosing operation. When the WAIT input is reset at the time of a
successful reclosing of the first circuit breaker, the slave is released to continue the
auto reclosing sequence after the set tSlaveDeadTime. The reason for shortening
the time, for the normal dead timers with the value of tSlaveDeadTime, is to give
the slave permission to react almost immediately when the WAIT input resets. The
minimum settable time for tSlaveDeadTime is 0.1sec because both master and slave
should not send the circuit breaker closing command at the same time.

Apparatus control APC

Section 9
Control
IP14560-1 v2
169