PUFFER-TYPE GASBLAST CIRCUIT-INTERRUPTER HAVING VARIABLE-AREA STATIONARY COMPOSITE PISTON STRUCTURE

摘要

A puffer-type gas-blast circuit-interrupter is provided having an operating cylinder movable over a fixed composite piston structure, the fixed composite piston structure providing a variable cross-sectional area by means of a secondary piston area, preferably annular in configuration, which is releasably latched in a fixed forward position, and, subsequently, during the opening operation of the breaker, collapsed to a retracted position.