| 摘要 |
<p>PURPOSE:To break certainly the induction current which does not form any current zero point by protruding an arc electrode from a stationary contacting piece which is in direct coupling with a main circuit conductor, and sending a gas in a puffer chamber blowing to the tip of a movable contacting piece. CONSTITUTION:When pole opening proceeds, an arc 20 moves toward an arc electrode 21 positioned nearer geometrically than a stationary contacting piece 13, and part of the current flows to the arc electrode 21. Arcs 24 are generated between it 21 and a movable contacting piece 17, and finally all current substantially transfers to the arc electrode 21. The current path follows from a conductor 8, to a resistor 22, the arc electrode 21, arcs 24, the movable contacting piece 17, and a grounding terminal part. Thus generates the condition that the resistor 22 is automatically inserted in a breaking current circuit serially. The gas compressed in a puffer chamber 25 is passed through an exhaust hole 26 and released from the tip of the movable contacting piece 17 to blow to the arcs 24. As the separating distance of the two contacting pieces 13, 17 has become sufficiently large, the arcs 24 go out certainly and the breaking is completed.</p> |
