| 摘要 |
<p>A resistant body 13 is provided in a periphery of at least one of the current-carrying members 11 on a surface of the insulator 12. The resistant body 13 distributes a voltage applied to the surface of the insulator 12 between a pair of the current-carrying members 11 adjacent to each other, so that a potential difference distributed on the surface of the insulator 12 is set to a discharge starting voltage or less.</p> |
