Verification of Short-circuit Current Level of Shaanxi Grid after Connecting with 750kV System

According to the development planning of Shaanxi grid,750 kV grid is used to replace 330 kV transmission network,thus, it is Shaanxi grid main network frame in future.In 2015,750kV grid will extend to northern southern Shaanxi,and a ring network structure may be formed in Guanzhong area of Shanxi Province.Therefore,the harmonious development operation of 750kV grid and 330kV grid in Shaanxi is becoming an issue which needs solving urgently.Through the verification of short-circuit current level of Shaanxi grid in 2010,2012 and 2015,this paper focus on the substation in which short-circuit current level is over standard or is close to over standard in Shaanxi grid development.