| 摘要 |
<p>A power switching apparatus comprising a vacuum interrupter assembly and a switching assembly connected in parallel between a pair of terminals, each of the terminals being connectable in use to an electrical circuit. The vacuum interrupter assembly includes at least one vacuum interrupter having a pair of electrically conductive rods connected at a first end to a respective one of the terminals and extending at a second end into a vacuum tight enclosure. A first electrode is mounted at or near the second end of a first of the electrically conductive rods and a slotted coil including a support base mounted at or near the second end of a second of the electrically conductive rods. A second electrode is mounted on an inner surface of the slotted coil and a third electrode is mounted on the support base. The second ends of the electrically conductive rods extend into the vacuum tight enclosure such that the first and third electrodes define opposed contact surfaces and at least one of the electrically conductive rods is movable relative to the other to open or close a gap between the opposed contact surfaces. The switching assembly includes at least one crossed-field plasma discharge switch that does not carry any current in its open state and conducts and carries current in its closed state. The switching assembly is controllable to switch between open and closed states to modify, in use of the power switching apparatus, a current flowing through the vacuum interrupter assembly.</p> |
