| 摘要 |
PURPOSE:To restrain generated voltage below two windings amount and to facilitate additional installation of a shield by a method wherein dummy-contacts are disposed at both sides of plus and minus fixed-contacts between zero fixed-contacts. CONSTITUTION:Dummy-contacts 18a-18c are disposed at both sides of plus and minus fixed-contacts 5a-5c, 6a-6c between zero fixed-contacts 4a-4b. The changer which is constituted in this manner, becomes either state of connection, plus with zero or minus with zero by the movement of movable contacts 14a- 14c. According to the above constitution, the all generated voltage of each section becomes a 1-2 windings amount. This is established regardless of connection status of the tap-contacts 3a-3c and plus or minus of the changer. Additionally, the portion which is generated two windings amount, are situated only between the contacts 4a-4c including the contacts 18a-18c and becomes disposition and structure in which additional installation of the shield for electric field relaxtion is facilitated. |
