Gas blast circuit breaker - has two annular electrodes, one acting as intermediate on one for light arc extinguishing between first one and chamber partition

摘要

The arc extinguishing chamber is filled with insulating gas and has an insulating partition which divides into a gas expansion chamber and a compression chamber containing the stationary contact. Coaxially to the latter is mounted a moving contact sliding in a through bore of the partition. The extinguishing chamber has an axial bore and radial apertures for connection of the chambers on a specified contact stroke in the breaking direction. An annular electrode is axially spaced from the stationary contact and electrically coupled to it via a surrounding coil. A second electrode forms the light arc intermediate point between the first electrode and the moving contact. The second electrode (18) is also annular and axially mounted between the first electrode (12) and the partition (5). It is radially spaced from the inner wall of the compression chamber (6).