Section 5 1MAC309294-MB FControl functions350 RER620Technical Manualservice, as does S2 to recloser T. Figure 188 and Table 317 summarize the sequence ofevents.Figure 188: 5-Reclosre Fault 3 scenario Sequence of EventsTable 317: 5-Reclosre Fault 3 scenario Sequence of Events5.4.5.3 Four-Recloser System OperationA four-recloser system is a hybrid of the three- and five-recloser systems. Between onesource and the TiePoint, recloser is a Sectionalizing recloser and a Midpoint recloser. Onlya Sectionalizing recloser appears between the other source and the TiePoint. TheSectionalizer and Midpoint from one source of the TiePoint is configured like reclosers ina five-recloser system. The other Sectionalizing recloser is configured like its counterpartin a three-recloser system. TiePoint configuration and operation is similar in all threetopologies.5.4.5.4 Restoring Normal OperationThe "Reset Logic" section covered previously explains on the steps involved in resettingthe LCM function and activated again safely when reclosers working in different modes.All the restoration steps should be performed before in full compliance with all applicablesafety procedures before resetting the LCM functionality in RER620 relay.Time Event or Conditont0 Permanent line fault occurs. Midpoint recloser trips and locks out causing loss of voltage atthe TiePoint reclosers.t1 TiePoint recloser declares phases dead, initiates loop control sequence, and closes itsbreaker. May request ALT thresholds (per settings) before closing breaker.t2 TiePoint breaker trips and locks out.Recoser CPermanentFault Initiates Recloser T senses faultcurrent then lockoutRecloser Tchanges to ALT1setting and closest0 + 10s2t0t t145 s - 3rd reclose and lockout15 s - 2nd reclose0.5 s - 1st reclose
