| 摘要 |
1,192,595. Protective systems; H.V.D.C. transmission systems. ALLMANNA SVENSKA ELEKTRISKA A.B. 16 Oct., 1967 [17 Oct., 1966], No. 46960/67. Headings H2F and H2K. A static converter 1 has current-responsive means 6 on the D.C. side of the converter and effective to cause the operation of short circuiting switches 13, 14 on both the D.C. and the A.C. sides of the converter. In addition, the means 6 may cause the opening of a circuit-breaker 15 on the A.C. side of the converter. In a converter station having a plurality of converters 1 ... 3 with the rectifiers 12, 22, 32 of the converters connected in series, a common means 6 is provided. This means 6 may include a measuring transductor 61 and relays 62, 63, 64 and respond when the D.C. current reaches a predetermined value. Alternatively the means 6 may operate in dependence on the rate of rise of the direct current, in which ease the relays 62 ... 64 may operate simultaneously or successively in dependence on the magnitude of time derivative.
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