Research on Three-phase Voltage Unbalance of 66kV Bus in Substation
Yang Lin1, Wang Liang2, Zhao Shouzhong1, Li Fengyu1, Wang Kai3
1. State Grid Liaoning Electric Power Supply Co., Ltd, Skills Training Center, Jinzhou, Liaoning 121001; 2. State Grid Liaoning Electric Power Supply Co., Ltd, Dispatching Control Center, Shenyang 110006; 3. State Grid Jinzhou Electric Power Supply company, Jinzhou, Liaoning 121000
Abstract：Many problems have been caused by unbalanced three-phase parameters in 66kV grid, such as three-phase voltage unbalance,higher displacement voltage of neutral-point,virtual grounding and difficult parameters setting of arc suppression coil etc. The problems will not only harm the safe operation, normal output of transformers and other facilities seriously, but also result in malfunction of relay protection, automatic safety facilities and increase of the power loss. The paper analysis theoretically the reason why arc suppression coil caused voltage more unbalanced seriously. The three methods includes reducing the asymmetry degree of grid, increasing off resonance degree of the compensation power grid and improving damping ratio of compensation power grid, reducing degree of three-phase voltage unbalance, which achieve good results.
杨林, 王亮, 赵守忠, 李凤羽, 王凯. 变电站66kV母线三相电压不平衡研究[J]. 电气技术, 2017, 18(1): 61-64.
Yang Lin, Wang Liang, Zhao Shouzhong, Li Fengyu, Wang Kai. Research on Three-phase Voltage Unbalance of 66kV Bus in Substation. Electrical Engineering, 2017, 18(1): 61-64.
2017, Vol. 18 
