| 摘要 |
<p>A fluid amplifier is utilized to operate the secondary or synchronous contacts of a circuit breaker having main or non-synchronous contacts and secondary or synchronous contacts, which are connected in parallel-circuit relation when the breaker is closed. The operation of the fluid amplifier is controlled by repulsion coil actuated valves. The energization of the repulsion coils is so controlled by current responsive means and by a synchronous control device that the secondary contacts are opened just prior to a current zero after the opening of the main contacts of the breaker. Compressed gas stored in an accumulator supplies energy for open-reclose-open-reclose operation of the secondary contacts if necessary.</p> |
