restarted when the conditions are fulfilled again. Circuit breaker closing is thus not permitted untilthe energizing condition has remained constant throughout the set delay setting time.13.2 Autorecloser for 1 phase, 2 phase and/or 3 phaseoperation SMBRREC (79) IP14559-1 v613.2.1 IdentificationM14890-1 v6Function Description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberAutorecloser for 1 phase, 2 phase and/or 3phaseSMBRRECO->ISYMBOL-L V1 EN-US7913.2.2 Application M12391-3 v7Automatic reclosing is a well-established method for the restoration of service in a power systemafter a transient line fault. The majority of line faults are flashover arcs, which are transient bynature. When the power line is switched off by the operation of line protection and line breakers,the arc de-ionizes and recovers its ability to withstand voltage at a somewhat variable rate. Thus, acertain dead time with a de-energized line is necessary. Line service can then be resumed byautomatic reclosing of the line breakers. The dead time selected should be long enough to ensurea high probability of arc de-ionization and successful reclosing.For individual line breakers, auto-reclosing equipment, the auto-reclosing open time is used todetermine line “dead time”. When simultaneous tripping and reclosing at the two line ends occurs,auto-reclosing open time is approximately equal to the line “dead time”. If the open time and deadtime differ then, the line will be energized until the breakers at both ends have opened.Section 13 1MRK 511 358-UUS AControl270Application manual
