| 摘要 |
<p>PURPOSE:To surely supply a making current by providing a rectifier for starting a supply of a making current by a flashover of a test switch and an auxiliary making device by which a current is brought to makeup in the first half-wave period in which the making current starts to flow to the rectifier. CONSTITUTION:Before makeup of a test switch 4, a half-wave voltage E1 is applied to a half period of an AC power source 1 by a rectifying operation of a rectifier 9, and in the remaining half period, a half-wave voltage E2 is applied. In this state, when such a makeup control of the switch 4 as a flashover is generated in the switch 4 while a high voltage is applied, the high voltage drops quickly due to the generation of a flashover of the switch 4, and when it becomes lower than the voltage E2 of a tap 2b, the rectifier 9 conducts, and a making current I2 flows. When an auxiliary making device 10 is brought to makeup while the first half-wave of this current I2 is flowing, the current I2 is commutated to the making device 10 and the rectifier 9 becomes an obstructed state. Thereafter, the current I2 is allowed to flow continuously by the making device 10. In such a way, while reducing the operation duty, comparing with a gap, a making current can be supplied surely by an automatic conduction of the rectifier 9.</p> |
