摘要
结合远景年电网规划,分析云南电网短路电流的分布特性和变化规律,采用二端口等值电路分析短路电流的主要影响因素。指出500 kV侧短路电流主要取决于500 kV侧电网结构,因此其限制措施应主要在500 kV电网层面解决,主要有网络拓扑结构优化、更换设备、加装限流电抗器或故障电流限制器等;而220 kV侧短路电流主导影响因素不具一致性,需依据站点具体情况匹配相应的限制措施。综合限流效果、经济性等因素,提出相适应的限制措施。
Combined with the long-term power grid planning of Yunnan,the distribution characters and changing rules of short-circuit exceeding standard of Yunnan power grids are analyzed,and the main infuencing factors afecting the short-circuit current are analyzed by a two-port equivalent circuit. It is pointed out that the short-current at 500 kV side mainly depends on 500 kV power network confguration,the limitation measures are proposed for 500 kV side such as to optimize the network structure,to replace equipment,and to install current-limiting reactor or short circuit limiter,while the main infuencing factors of short-current at 220 kV side are not consistent,and the limitation measures for 220 kV side are needed to propose about the concrete substation actual situation. The short-circuit current limiting measures of Yunnan power grid are proposed considering various factors such as the efect of current limiting,economy and so on.
作者
刘民伟
郭洪芹
胡凯
LIU Minwei;GUO Hongqin;HU Kai(Yunnan Electric Power Grid Corporation,Kunming 650011;China Energy Engineering Group Yunnan Electric Power Design Institute Co.,Ltd,Kunming 650051)
出处
《云南电力技术》
2018年第5期35-38,共4页
Yunnan Electric Power
关键词
短路电流
限制措施
自阻抗
云南电网
short circuit current
limitation measures
self-impedance
Yunnan power grid
