| 摘要 |
An axial blast breaking chamber for self-blasting compressed gas electric circuit breakers wherein the chamber wall is provided with sets of upstream and downstream radial holes having entrances to the inside of the breaker chamber through respective ring-like feeding grooves coaxial to the longitudinal axis of the chamber. When the circuit breaker contacts are closed, the fixed contact, which is in close proximity to the inner wall of the chamber, extends past the feeding grooves thereby inhibiting flow of quenching gas. Flow of quenching gas remains inhibited until the chamber and attached movable contact are displaced sufficiently to withdraw the feeding groove and upstream set of radial holes below the lower end of the fixed contact. The flow is appreciably increased after the downstream set of radial holes is uncovered and interruption of the arc completed as the chamber and movable contact are further separated from the fixed contact. |
