电力系统保护与控制Issue(24)：1-5,5.
一种基于相位相关电流差动的站域后备保护算法
A study of substation-area backup protection based on phase related current differential
摘要
Abstract
There is a drawback in traditional substation area current differential protection, when the scale factor k monotonously changes, the sensitivity of the internal and external fault will vary oppositely. This paper proposes a substation-area backup protection based on phase related current differential which use the multi points redundancy information. The analysis shows that when the scale factor k monotonically increases, sensitivity of the internal and external fault will increase together. As the increasing of ground resistance, sensitivity of fault will increase. On the other hand, when the external faults cause CT saturation, the traditional protection will mis-operate, but the new algorithm can overcome the shortcoming. At last, PSCAD/EMTDC is used to build a 220 kV substation model, simulation results verify the theoretical analysis.关键词
相位相关/站域电流差动/CT饱和/接地电阻/后备保护Key words
phase related/substation area current differential/CT saturation/grounding impedance/backup protection分类
信息技术与安全科学引用本文复制引用
李倍,和敬涵,Tony Yip..一种基于相位相关电流差动的站域后备保护算法[J].电力系统保护与控制,2014,(24):1-5,5.基金项目
国家自然科学基金项目(51277009)This work is supported by National Natural Science Foundation of China (No.51277009) （51277009）
