Circuit breaker of average or high voltage comprising a break chamber has a dielectric strength improved

摘要

The circuit breaker of average or high voltage has a breaking chamber containing a dielectric gas, in which the displacement of a moving contact (2) with respect to a fixed contact (3) in order to open the circuit breaker gives rise to an electric arc which quickly becomes established between the moving contact (2) and an external electrode (6) which is electrically connected to the fixed contact (3), and in which a coil (7) mounted in series with the external electrode (6) is supplied by the electric arc in order to generate a magnetic field which moves the electric arc, with respect to the dielectric gas which is at repos.une central electrode (9) is electrically connected to the moving contact (2) and passes through the external electrode (6) for the electric arc to be driven in movement being established between the two electrodes (6, 9). the electric field created between the two electrodes is substantially uniform, which makes it possible to minimize the risk of restart the electric arc.