Section 11 Logic11.1 Tripping logic SMPPTRC IP14576-1 v411.1.1 IdentificationSEMOD56226-2 v6Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberTripping logic SMPPTRCI->OSYMBOL-K V1 EN-US94Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberTripping logic SMPPTRC1 -> 0IEC15000314 V1 EN-US9411.1.2 Application M12252-3 v8All trip signals from the different protection functions shall be routed through the trip logic. Inits simplest alternative the logic will only link the TRIP signal and make sure that it is longenough.Tripping logic SMPPTRC offers three different operating modes:• Three-phase tripping for all fault types (3ph operating mode)• Single-phase tripping for single-phase faults and three-phase tripping for multi-phase andevolving faults (1ph/3ph operating mode). The logic also issues a three-phase trippingcommand when phase selection within the operating protection functions is not possible,or when external conditions request three-phase tripping.• Two-phase tripping for two-phase faults.The three-phase trip for all faults offers a simple solution and is often sufficient in well meshedtransmission systems and in sub-transmission systems. Since most faults, especially at thehighest voltage levels, are single phase-to-earth faults, single-phase tripping can be of greatvalue. If only the faulty phase is tripped, power can still be transferred on the line during thedead time that arises before reclosing. Single-phase tripping during single-phase faults mustbe combined with single pole reclosing.One SMPPTRC function block should be used for each breaker, if the line is connected to thesubstation via more than one breaker. Assume that single-phase tripping and autoreclosing isused on the line. Both breakers are then normally set up for 1/3-phase tripping and 1/3-phaseautoreclosing. As an alternative, the breaker chosen as master can have single-phase tripping,while the slave breaker could have three-phase tripping and autoreclosing. In the case of apermanent fault, only one of the breakers has to be operated when the fault is energized a1MRK 505 355-UEN A Section 11Logic183Application manual
