5.21.1 CB TRIP CONVERSION LOGIC DIAGRAMV03386Trip Inputs A 1R QS Trip Output ATrip Inputs B 1R QS Trip Output BTrip Inputs C 1R QS Trip Output CTripping Mode3 Pole11AR Force 3 poleForce 3Pole TripTrip Inputs 3Ph&1R QS Trip 3ph1 Any TripDwell100 ms111Pole Dead APole Dead BPole Dead CTrip Inputs ATrip Inputs BTrip Inputs C&&&1&R QSR QS2/3 Ph Fault3 Ph Fault≥2530531532858533529530531532892893894523524525526522527528Figure 203: Circuit Breaker Trip Conversion Logic Diagram (Module 63)5.22 MONITOR CHECKS FOR CB CLOSUREFor single-phase Autoreclose neither voltage nor synchronisation checks are needed as synchronising powershould be flowing in the two healthy phases. For three-phase Autorelcose, for the first shot (and only the first shot),you can choose to attempt reclosure without performing a synchronisation check. The setting to permitAutoreclose without checking synchronising conditions is CB SC Shot 1.Otherwise, synchronising checks on voltages, relative frequencies, and relative phase angles are needed to ensurethat sympathetic conditions exist before CB closure is attempted.The following diagrams detail the Monitor Checks for CB closure.P543i/P545i Chapter 11 - AutorecloseP54x1i-TM-EN-1 343
