Section 12 Control12.1 Synchronism check, energizing check, andsynchronizing SESRSYN (25) IP14558-1 v412.1.1 IdentificationM14889-1 v4Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberSynchrocheck, energizing check, andsynchronizingSESRSYNsc/vcSYMBOL-M V1 EN-US2512.1.2 Application IP15111-1 v112.1.2.1 Synchronizing SEMOD171992-5 v9To allow closing of breakers between asynchronous networks, a synchronizing featureis provided. The breaker close command is issued at the optimum time whenconditions across the breaker are satisfied in order to avoid stress on the network andits components.The systems are defined as asynchronous when the frequency difference between busand line is larger than an adjustable parameter. If the frequency difference is less thanthis threshold value the system is defined to have a parallel circuit and the synchronismcheck function is used.The synchronizing function measures the difference between the V-Line and the V-Bus. It operates and enables a closing command to the circuit breaker when thecalculated closing angle is equal to the measured phase angle and the followingconditions are simultaneously fulfilled:1MRK 505 370-UUS A Section 12ControlBusbar protection REB670 2.2 ANSI 293Application manual
