SYNCHRONOUS CIRCUIT INTERRUPTER

摘要

In a circuit breaker, main current carrying contacts are in parallel with secondary or synchronous interrupter contacts, and an isolating switch is in series with both the main contacts and the synchronous interrupter. The synchronous interrupter is switched into the circuit when the main contacts open and interrupts the current at a current zero after the opening of the main contacts. The synchronous contacts are operated by electrodynamic drive means controlled by a current zero anticipator of a static type. The synchronous contacts can be small and light to facilitate synchronous operation since they carry the fault current only for the time between the opening of the main contacts and interruption of the fault.