Section 10 Control10.1 Synchronism check, energizing check, andsynchronizing SESRSYN (25)10.1.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberSynchrocheck, energizing check, andsynchronizingSESRSYNsc/vcSYMBOL-M V1 EN2510.1.2 FunctionalityThe Synchronizing function allows closing of asynchronous networks at the correctmoment including the breaker closing time, which improves the network stability.Synchrocheck, energizing check, and synchronizing SESRSYN (25) function checks thatthe voltages on both sides of the circuit breaker are in synchronism, or with at least oneside dead to ensure that closing can be done safely.SESRSYN (25) function includes a built-in voltage selection scheme for double bus andbreaker-and-a-half or ring busbar arrangements.Manual closing as well as automatic reclosing can be checked by the function and canhave different settings.For systems, which are running asynchronous, a synchronizing function is provided. Themain purpose of the synchronizing function is to provide controlled closing of circuitbreakers when two asynchronous systems are going to be connected. The synchronizingfunction evaluates voltage difference, phase angle difference, slip frequency andfrequency rate of change before issuing a controlled closing of the circuit breaker. Breakerclosing time is a parameter setting.1MRK 511 287-UUS A Section 10Control221Technical manual
