I. Introduction
The power station of the JinSha River middle reaches which sent to Guangxi was put into production in June 2016 (‘JingZhong HVDC’ for short),the voltage level is s 500kV, transmission capacity is 3200 MW. The DC project starting in the JinGuan station in LiJiang of Yunnan province and ending in the GuiZhong station of Guangxi province, and the length of the DC line is 1139km.