| 摘要 |
<p>1,002,357. Frequency changing. BROWN BOVERI & CO. Ltd. June 12, 1962 [June 13, 1961], No. 22484/62. Heading H2F. A three-phase frequency changing arrangement comprises three circuits each consisting of a three-phase secondary winding 7, 8 and 9, associated with pairs of back-to-back controllable rectifiers 1 and 2, 3 and 4, 5 and 6, one pair per phase, the three circuits being connected in delta and low frequency output being obtained from the delta points U, V, W, and the control being such that only two rectifiers are conductive at any instant. The rectifiers may be semi-conductor controlled rectifiers or mercury arc rectifiers (which may be multianode vessels). Arrangements for the control of the rectifiers are disclosed.</p> |
