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UHV refers to +1000kV and ±800kV power transmission. The technology enables large-capacity, long-distant power transmission with high efficiency and less line loss. Since 2004, State Grid has achieved breakthrough in UHV theory, technology, standard, equipment, project construction and operation in collaboration with all sides, mastered UHV power transmission technology with independent intellectual property rights and promoted Chinese UHV technology and equipment to go global, realizing “created in China” and “led by China”.By June 2019, 9 AC and 10 DC UHV power transmission projects have been built, with a total line length of 27,570 km and a transforming (converting) capacity of more than 296.2 GVA(GW). Another 3 AC and 1 DC UHV transmission projects are under construction. UHV AC and UHV DC projects won Special Prizes of National Prize for Progress in S&T in the year 2012 and 2017. UHV transmission channels have transmitted more than 1,145.777 TWh of power, playing an important role in securing power supply, promoting the development of clean energy, improving environment protection and power grids security.


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