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The high voltage direct current transmission system Kingsnorth in London was until today the only application of the technology of high voltage direct current transmission for the supply of transformer stations in a city. It was realized in the first half of the 1970er years and went 1975 into service. It run from the power station Kingsnorth as a 59 kilometers long bipolar underground cable for a voltage of 266 kV to the static inverter station in Beddington. There was the static inverter for one pole. The cable continued to run still 26 kilometers longer as single-pole line to Willesden, where the static inverter for the other pole was. There was also the possibility, if the static inverter station in Kingsnorth was out of service, to run the system as monopolar HVDC between the stations Beddington and Willesden. The HVDC Kingsnorth was the last HVDC equipped with mercury steam electric rectifiers, whereby each static inverter for 266kV consisted of two six-pulse valve bridges for 132kV switched in series, which were each fed via a star-star and a star-delta switched transformer. All HVDC systems, which were later built, used thyristor valves. The HVDC Kingsnorth could transfer a maximum power of 640 megawatts (320 megawatts per pole). Because the facility does not correspond no more nowadays operating requirements, it was in the meantime shut down and replaced by three-phase alternating current cables.
Source: http://de.wikipedia.org/wiki/HG%DC_Kingsnorth
