An employee of an electric power company in China controls a multi-rotor aircraft during a line patrol mission for the coming National Day holidays in Chongqing, southwest China's municipality - Xinhua Photo.
LONDON: China's power engineers have become world leaders in ultra-high-voltage transmission systems connecting far-off power sources with cities hungry for electricity.
China already has seven ultra-high-voltage (UHV) lines in operation, more than any other country, carrying power over thousands of kilometres at around 800,000 or even 1 million volts.
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