| 摘要 |
<p>When the butt contacts of a vacuum arc discharge device are parted, the movable one of the contacts is withdrawn into a steel shield, giving the device high current interruption capability. The shield can be grounded to an endwall of the device of electrically isolated therefrom. Facing the stationary contact with a hardened steel enables it to withstand the dielectric stress extant at recovery. Facing the movable contact with a refractory metal allows high current and voltage interruption capability without adversely affecting current chopping performance, while limiting contact erosion and weld forces.</p> |
