The art of generator synchronizing

摘要

This paper presents a review of power-system synchronization, proper sync-check coordination, and fast synchronization methods. When paralleling two sources, it is crucial that the interconnecting circuit breaker be closed only when both sources are in voltage, frequency, and phase coincidence. An operator can synchronize manually or use one of the latest, state-of-the-art automatic synchronizers (ANSI/IEEE device 25A) [1] and sync-check relays (ANSI/IEEE device 25) to automate closing. Generator and bus synchronization share most principles-with some important differences-for each type of synchronization. For generation plants, the method of generator synchronization selected depends greatly on the plant configuration and operating mode. For bus-line applications, the synchronizing method selected depends on the power-system "stiffness", motor loads, and whether a wye-delta transformer is located between the line and bus.