Yunnan–Guangdong HVDC

The HVDC Yunnan - Guangdong is a high-voltage direct current transmission line ( HVDC) in China between the city of Chuxiong in Yunnan Province and the eastern city of Zengcheng near Guangzhou in Guangdong Province. The 1418 km long pipeline is operated by China Southern Power Grid and is the first bipolar HVDC transmission which is operated in the final with an operating voltage of ± 800 kV.

The construction was begun in 2007, was commissioned in the HVDC monopolar trial operation in December 2009, the full bipolar operation started in June 2010. Manufacturer of the line is the Siemens AG.

The HVDC is designed in full operation for a transmission capacity of 5 GW, the electric current per wire is 3125 A. The two converter stations consist of four converters, each 400 kV. Due to the high DC voltage of ± 800 kV, the electrical conductors of the transmission line are provided with a silicone coating - this is to reduce corona discharges. The transport of electric current is from Yunnan, where the HVDC is powered by four three-phase AC power lines with 500 kV of two hydroelectric power plants on the Xiaowan Dam and Manwan Dam, in the industrially developed metropolitan area of ​​Guangzhou.