Arrangement for deletion of an arc in a gasstroemungsschalter

摘要

1498752 Gas blast circuit breaker SIEMENS AG 11 Nov 1975 [25 Nov 1974] 46626/75 Addition to 1460814 Heading H1N The invention of the parent Specification is modified in that the non-return valve in the, or each, flow path directing quenching gas onto the arcing region is placed at the outlet end of the flow path. In the embodiment the flow path is in two portions 10, 14, the latter preferably being enlarged 118 near its outlet and terminating close to the throat 114 of the insulating nozzle member 4 in the body of which the flow paths are formed. The non-return valve 19 may either be just outside the end of the outlet, or may be fitted in a recess just within the end (Fig. 2, not shown). It is protected from the arc by a cover 120. The member 4 may be shaped to provide a quenching chamber 115 which may contain cooling fins or a honeycomb or grid 116. To relieve excess pressure in the space 26 a relief valve 82 may be provided in an overflow duct 76, 77 in the body of the nozzle 4. Gas is admitted to chamber 26 through valve 43 and may be pressurized further by movement of rear wall 42.