Drive boost for gas blast circuit breaker - uses differential piston to compress quenching gas to high press. for arc quenching

摘要

The quenching gas flow is produced by a compression device during switching off. The quenching gas in the circuit breaker is compressed in a compression chamber (2) by the face (1a) of a differential piston (1). The high compression causes the quenching gas to flow in the direction of the light arc. At least part of the quenching gas, heated by the light arc, is expanded in a quenching gas expansion chamber (6). Thus the other face (1b) of the piston ana at least a part of the chamber boundary (6a) are moved apart. This fraction of the quenching gas is drawn off towards the end of the switching off from the expansion chamber to the quenching chamber of the circuit breaker surrounding the compression and expansion chambers.