Lock-outRXMD1111221MAIN ZAK CLOSE CLOSE COMMANDSMBOORSMBRRECORCCRBRFBU-TRIPZCVPSOF-TRIP INHIBITUNSUCCLTRBUIEC05000315-4-en.vsdIEC05000315-WMF V4 EN-USFigure 60: Lock-out arranged with an external Lock-out relayCLOSE COMMANDORSMBRRECORCCRBRFBU-TRIPZCVPSOF-TRIP INHIBITUNSUCCLTRBUSMPPTRCANDRESET LOCK-OUTORORSESRSYNFunctional key,SOFTWAREOR IO RESETMANSYOKMAN CLOSESMBRREC CLOSECLLKOUTRSTLOUTSETLKOUTIEC05000316-3-en.vsdSMBOMANENOKIEC05000316-WMF V3 EN-USFigure 61: Lock-out arranged with internal logic with manual closing going through inIED10.1.2.20 Evolving fault M12391-217 v3An evolving fault starts as a single-phase fault which leads to single-phase tripping and thenthe fault spreads to another phase. The second fault is then cleared by three-phase tripping.The Auto-Reclosing function will first receive a trip and start signal (START) without any three-phase signal (TR3P). The Auto-Reclosing function will start a single-phase reclosing, ifprogrammed to do so. At the evolving fault clearance there will be a new signal START andthree-phase trip information, TR3P. The single-phase reclosing sequence will then be stopped,and instead the timer,t1 3Ph, for three-phase reclosing will be started from zero. The sequencewill continue as a three-phase reclosing sequence, if it is a selected alternative reclosing mode.The second fault which can be single phase is tripped three phase because trip module (TR) inthe IED has an evolving fault timer which ensures that second fault is always tripped threephase. For other types of relays where the relays do not include this function the outputPREP3PH (or the inverted PERMIT1PH) is used to prepare the other sub-system for three phasetripping. This signal will, for evolving fault situations be activated a short time after the firsttrip has reset and will thus ensure that new trips will be three phase.Section 10 1MRK 505 355-UEN AControl158Application manual
