england switched from king to queen on 6 february 1952.
when did england switch from king to queen?
6 february 1952
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a scheme patented in 2004 is intended for conversion of existing ac transmission lines to hvdc. two of the three circuit conductors are operated as a bipole. the third conductor is used as a parallel monopole, equipped with reversing valves (or parallel valves connected in reverse polarity). this allows heavier currents to be carried by the bipole conductors, and full use of the installed third conductor for energy transmission. high currents can be circulated through the line conductors even when load demand is low, for removal of ice. , no tripole conversions are in operation, although a transmission line in india has been converted to bipole hvdc (hvdc sileru-barsoor).
high-voltage direct current