| 摘要 |
A fluid-blast circuit-interrupter of the puffer-type is provided having two connected piston structures, one designated herein as a primary piston structure, and the other termed a secondary piston structure, connected serially mechanically in tandem series arrangement to thereby compress a suitable arc-extinguishing fluid in two separate compression chambers. Valve action is utilized to delay the initiation of the second gas-blast from the second compression chamber toward the arc until the separable interrupting contacts have reached a desired predetermined contact separation distance. By suitably changing the component dimensions of the interrupter, the degree of gas compression, and the instant of gas-blast application of the second arc-extinguishing blast, may be changed without delaying the instant of initial contact separation.
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