![]() ![]() Fifteen Thury systems were in operation by 1913. This system used eight series-connected generators with dual commutators for a total voltage of 150 kV between the positive and negative poles, and operated from c.1906 until 1936. The Moutiers–Lyon system transmitted 8,600 kW of hydroelectric power a distance of 200 km, including 10 km of underground cable. This system transmitted 630 kW at 14 kV DC over a distance of 120 km. The transmission line was operated in a 'constant current' mode, with up to 5,000 volts across each machine, some machines having double commutators to reduce the voltage on each commutator. ![]() Each set was insulated from electrical ground and driven by insulated shafts from a prime mover. This system used series-connected motor-generator sets to increase the voltage. ![]() An early method of HVDC transmission was developed by the Swiss engineer René Thury and his method was put into practice by 1889 in Italy by the Acquedotto De Ferrari-Galliera company. The first long-distance transmission of electric power was demonstrated using direct current in 1882 at Miesbach-Munich Power Transmission, but only 1.5 kW was transmitted.
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