| 摘要 |
A high- and medium-voltage gas circuit breaker comprises a cylindrical electrically insulative enclosure filled with dielectric gas under pressure, a fixed main contact and a fixed arc contact. A mobile assembly is coupled to an operating member and comprises a mobile main contact, a mobile arc contact and a blow-out cylinder associated with a blow-out nozzle and cooperating with a first piston. A second piston is fastened to the mobile assembly and slides in a fixed second cylinder. The second piston has a large cross-section in relation to the cross-section of the blow-out cylinder. The second piston is associated with a system for providing low head loss communication with the arc area and comprises orifices of calibrated size to limit the pressure on the face of the piston on which the gas heated by the arc impinges.
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