| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problem: a vacuum vessel cannot be miniaturized, since electrodes are made of copper and a copper alloy material, but their withstand voltage characteristics in vacuum is low, in a vacuum circuit breaker. SOLUTION: The vacuum vessel 2 of this vacuum circuit breaker 1 is composed of a metallic tube 3, an insulating tube 4 and a metallic seal part 5. A fixed electrode 6 and a movable electrode 7 in the vacuum vessel 2 are disposed in a space surrounded by the metallic tube 3. Electric field shields 13A, 13B of stainless steel are disposed around the electrodes 6, 7 facing the metallic tube 3. Thereby, dielectric strength between the peripheral ends of the electrodes 6, 7 and the metallic tube 3 increases, and the vacuum vessel 2 can be miniaturized. COPYRIGHT: (C)2004,JPO&NCIPI
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