| 摘要 |
<p>A gas-blast type interrupter comprises first and second electrodes relatively movable between a closed position in which they are in mutual electrical engagement and an open position in which they are mutually separated, movement of the electrodes towards their open position causing an arc to be drawn therebetween. A tubular housing encloses the first electrode and has therein a first insulating orifice through which the second electrode substantially sealingly passes when the electrodes are in their closed position. A guide surrounds the tubular member and has therein a second insulating orifice through which the second electrode also substantially sealingly passes when the electrodes are in their closed position, the first and second orifices being co-axial and of essentially the same size. The tubular housing and the guide define therebetween an annular chamber to which pressurized gas is supplied upon movement of the electrodes towards their open position, so that when the second electrode passes out of the first insulating orifice pressurized gas is permitted to flow therethrough into the interior of the tubular member in a direction essentially along said arc, and when the second electrode subsequently passes out of the second insulating orifice the pressurized gas is permitted to flow therethrough from the annular chamber in the opposite direction to the gas flowing through the first orifice.</p> |
