It can also operate in a scheme comprising two or more protection functions.5.8.6.2 Connections between autoreclosure and distance functionsGUID-6A5B98BA-F1BC-4111-847E-73E435ADDECC v1The autoreclosure function determines from the states of the input signals start, Trip CB andTrip CB 3P, whether the distance protection has picked up and whether it has performed asingle or a three-phase trip. Only the Trip CB signal is generated for a single-phase trip,whereas both the Trip CB and Trip CB 3P signals are generated for a three-phase trip.The external distance relay or internal distance function decides whether single or three-phasetripping should take place.The autoreclosure function can send two signals to the distance protection. The Trip 3-Polsignal informs the distance protection whether it should perform a single or a three-phasetrip. The ZExtension signal switches the distance protection’s over-reaching zone on and off.Where the SOTF logic is not required to operate during autoreclosure, connect the AR in prog.signal to the ExtBlkSOTF binary input of the distance function. The SOTF 10 s timer in thedistance function’s SOTF logic is normally activated for dead times <10 s and in this case theabove connection is not necessary.If the SOTF logic initiates tripping, an autoreclosure cycle can be inhibited by connecting thestart SOTF from the distance function to the CondBlkAR input of the autoreclosure function.18000048-IEC19000453-1-en.vsdxIEC19000453 V1 EN-USFigure 49: Distance and autoreclosure functions in the same unitSection 5 1MRK 505 406-UEN BBay protection functions138 Bay protection functions REB500Technical manual© Copyright 2019 ABB. All rights reserved
