| 摘要 |
One form of electrohydraulic crushing apparatus comprises a liquid-immersed spark-gap across which is connected a first capacitor pulse-charged by repetitively discharging a second capacitor through the primary winding of a step-up pulse-transformer, the two capacitors being matched in value as reflected by the transformer ratio. In order to maintain the breakdown voltage close to peak value despite erosion of the gap electrodes, the present invention checks that each first half-cycle of current in the transformer primary winding terminates within a predetermined time-range after the start of the half-cycle. If it terminates outside this time-range, electromechanical means are controlled to adjust the electrode gap-width so that the half-cycle terminates within this range. Because of statistical variations in the breakdown voltage, it is arranged that a substantial number of half-cycles must terminate outside the predetermined time-range before the gap-width is adjusted. |
