The Auto-Reclosing function will first receive a trip and initiate signal (RI) without anythree-phase signal (TR3P). The Auto-Reclosing function will start a single-phasereclosing, if programmed to do so. At the evolving fault clearance there will be a newsignal RI and three-pole trip information, TR3P. The single-phase reclosing sequence willthen be stopped, and instead the timer, t1 3Ph, for three-phase reclosing will be startedfrom zero. The sequence will continue as a three-phase reclosing sequence, if it is aselected alternative reclosing mode.The second fault which can be single phase is tripped three phase because trip module(TR) in the IED has an evolving fault timer which ensures that second fault is alwaystripped three phase. For other types of relays where the relays do not include this functionthe output PREP3PH (or the inverted PERMIT1PH) is used to prepare the other sub-system for three pole tripping. This signal will, for evolving fault situations be activateda short time after the first trip has reset and will thus ensure that new trips will be threephase.12.2.2.21 Automatic continuation of the reclosing sequenceSMBRREC (79) function can be programmed to proceed to the following reclosing shots(if multiple shots are selected) even if start signals are not received from the protectionfunctions, but the breaker is still not closed. This is done by setting parameter AutoCont =Enabled and tAutoContWait to the required delay for the function to proceed without anew start.12.2.2.22 Thermal overload protection holding the auto-reclosing function backIf the input THOLHOLD (thermal overload protection holding reclosing back) isactivated, it will keep the reclosing function on a hold until it is reset. There may thus bea considerable delay between start of Auto-Reclosing and reclosing command to thecircuit-breaker. An external logic limiting the time and sending an inhibit to the INHIBITinput can be used. The input can also be used to set the Auto-Reclosing on hold for a longeror shorter period.12.2.3 Setting guidelines12.2.3.1 ConfigurationUse the PCM600 configuration tool to configure signals.Autorecloser function parameters are set via the local HMI or Parameter Setting Tool(PST). Parameter Setting Tool is a part of PCM600.1MRK 505 337-UUS - Section 12Control313Application manual
