| 摘要 |
<p>PURPOSE:To enable the implementation of a test equivalent to the one for a real system without impressing an excessive voltage on a breaker to be tested, by a method wherein a prescribed test current is supplied from a current source circuit having a short-circuit generator as a main element and voltages reverse only in polarity to each other are impressed from two voltage source transformers on the opposite terminals of the breaker to be tested, simultaneously with the breaking of said current. CONSTITUTION:A prescribed test current Ip is supplied from a short-circuit generator 1 to a breaker 8 to be tested, through a current-limiting reactor 2, a current source transformer 3, a first auxiliary breaker 6 and a second auxiliary breaker 7. Next, a breaking instruction is given to the breakers 6-8 so that each of them makes breaking at the current zero point of the current Ip. Then the contacts of the breaker 8 are opened at a certain time, and thereafter an arc is generated between the contacts till a current breaking point. Moreover, a detecting device 15 is made to operate just before the current zero point and a starting device 16 and a starting gap 17 are controlled to operate so that transient recovery voltages e1 and e2 being reverse in polarity and equal in amplitude to each other are impressed from the opposite-side terminals of the breaker 8 just after the current zero point. In this way, a test equivalent to the one for a real system can be implemented without applying an excessive voltage on the breaker 8.</p> |
