| 摘要 |
<p>PURPOSE:To provide a synthetic breaking test circuit by which a hardly attenuated zero miss current can be obtained. CONSTITUTION:When AC voltages of generators 5 and 10 of electric current source circuits 1 and 2 reach a zero point, a first closing switch 6 is closed. At this time, an electric current 11 containing DC equivalence close to 100% flows to the secondary side of a first transformer 8, and this also flows to a specimen HGSG4. When generating voltages of the first generator 5 and the second generator 10 come to the next zero point after the first closing switch 6 is closed, a second closing switch 11 is closed. When the second closing switch 11 is closed, an electric current (i2) containing DC equivalence close to 100% similarly flows from the second electric current source circuit 2. From this time, a zero miss electric current (i0) by synthsizing an electric current (i1) and the electric current (i2) flows to a specimen switch 4. A second auxiliary circuit breaker 14 is opened in time such as becoming arc time not less than prescribed 80ms, and a zero point is created in the zero miss electric current (i0), and in succession, a first auxiliary circuit breaker 9 is opened, and is simultaneously broken at the same electric current zero point with the specimen switch 4.</p> |
