POWER TRANSMISSION PLANT FOR HIGH VOLTAGE DIRECT CURRENT COMPRISING AT LEAST THREE CONVERTER STATIONS WITH SWITCHING MEANS THEREBETWEEN

摘要

1,180,432. High voltage D.C. transmission systems. ALLMANNA SVENSKA ELEKTRISKA A.B. 14 June, 1967 [15 June, 1966], No. 27416/67. Heading H2F. A high voltage D.C. transmission system comprises or number of converter stations II, III, IV each comprising converting elements, e.g. 9, 10 connected in series. Pairs of converter stations are interconnected by switches, e.g. 23, 24 which can connect or disconnect some of the converters the switches being so arranged that the total number of converting elements in series remains the same. As shown, switches 23, 24 are relays which are so operated that one or other of the converting elements 10, 13 is always in circuit. In a modification, Fig. 3 (not shown) the changeover switches 23, 24 are replaced by shorting switches (31, 32).