| 摘要 |
<p>1,235,202. Gas-blast circuit-breakers. I-T-E IMPERIAL CORP. 3 Sept., 1968 [6 Nov., 1967], No. 41754/68. Heading H1N. A gas-blast circuit-breaker has a fixed contact 53 having a central opening, an elongated axially-movable contact member 86 with a plurality of contact fingers 60, 66 co-operating with the fixed contact, a cylindrical insulating chamber 125 surrounding the movable contact and movable therewith, and biasing means (indicated at 131, 133) biasing the chamber away from the fixed contact. One end 128 of the chamber engages an annular surface of the fixed contact when the contacts are closed. The fixed contact 53 is screwed into a support 35 which is slotted as indicated at 43 so that the fixed contact may be locked in position by tightening screws 57. The movable contact member 86 carries an arcing contact 85 and a retainer 80 which supports a ring of contact fingers 60, 66 which have arc-resistant inserts 72 biased inwardly by leaf springs 76, 77. These springs are located by projections 74, 75 on the contact fingers and are held in biasing engagement with insulating buttons 78, 79 on the fingers 60, 66 by a spring retainer 81. The lower ends of the fingers slide on a fixed member 89 which has insulating guide rings 107, 108 in which the contact member 86 slides. The member 86 is connected to an ear 152 extending from a cylindrical blast valve 158. Two of the circuitbreaker assemblies may be mounted on a common blast valve assembly which is mounted on a high pressure receiver, e.g. of air or sulphurhexafluoride. This and another similar assembly are each mounted on an insulating pedestal within an outer tank containing the gas at a lower pressure. Three such arrangements may form a four-break three-phase circuit-breake Figs.25.. 28 (not shown).</p> |
