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 atone end of a line. There is a possibility to extend the auto reclosing dead time insuch a case by use of the PLCLOST input, and the tExtended t1 setting. Typicalsetting 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-speedauto reclosing, t1 3PhHS. This high-speed auto reclosing is activated by theSTARTHS input and is used when auto reclosing is done without the requirement ofsynchrocheck 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 possiblelater shots are usually set at 30s or more. A check that the circuit breaker dutycycle can manage the selected setting must be done. The setting can in some casesbe restricted by national regulations. For multiple shots the setting of shots two tofive must be longer than the circuit breaker duty cycle time.MasterSlave settingsPriority: In single circuit breaker applications, one sets Priority = None. Atsequential reclosing the auto recloser for the first circuit breaker, e.g. near thebusbar, is set as master (High) and the auto recloser for the second circuit breakeris set as slave (Low).tWaitForMaster: The slave should take the duration of the circuit breaker closingtime of the master into consideration before sending the circuit breaker closingcommand. A setting tWaitForMaster sets a maximum wait time for the WAIT inputto 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 setlonger than the auto reclosing dead time plus a margin for synchrocheck conditionsto 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 backthe auto reclosing operation. When the WAIT input is reset at the time of asuccessful reclosing of the first circuit breaker, the slave is released to continue theauto reclosing sequence after the set tSlaveDeadTime. The reason for shorteningthe time, for the normal dead timers with the value of tSlaveDeadTime, is to givethe slave permission to react almost immediately when the WAIT input resets. Theminimum settable time for tSlaveDeadTime is 0.1sec because both master and slaveshould not send the circuit breaker closing command at the same time.12.3 Apparatus control IP14560-1 v312.3.1 Application M13443-4 v14The apparatus control is a functionality for control and supervising of circuitbreakers, disconnectors, and earthing switches within a bay. Permission to operate1MRK 505 393-UEN B Section 12ControlLine differential protection RED650 2.2 IEC 251Application manual
