双母单分段主接线母联电流异常处理方案  

The bus-coupler current abnormal solution of double bus with subsection

作　　者：朱军红 胡宝 张晓波 宋桂娥 Zhu Junhong;Hu Bao;Zhang Xiaobo;Song Guie(XJ Electric Co.,Ltd,Xuchang,He’nan 461000)

机构地区：[1]许继电气股份有限公司

出　　处：《电气技术》2019年第10期75-79,共5页Electrical Engineering

摘　　要：针对双母单分段主接线方式下母联/分段电流异常时(如电流互感器断线,采样值断链等),与该母联/分段不相邻的母线发生故障,母线差动保护会误跳该母联/分段元件的问题,本文分析了问题产生的原因,提出了在母线保护现有大差比率差动、小差比率差动的基础上,增加中差比率差动来选择故障母线,保证母线差动保护在母联/分段电流异常时能正确选择跳闸元件、不误跳相关元件的解决方案,并通过实时数字仿真仪仿真,验证了该方案的正确性。In the case of abnormal bus-coupler current(such as current transformer wired-break,sampled value chain break,etc.)in double bus with subsection connection,if the busbar not adjacent to the bus-coupler fails,the busbar differential protection may mistakenly trip the bus-coupler element.This paper analyzes the causes of the problems.based on the existing large differential protection and small differential protection,proposed increasing the the medium differential protection to select the fault busbar,so as to ensure that the busbar differential protection can correctly select the tripping element and not trip the irrelevant element when the bus-coupler current is abnormal.The correctness of the scheme is verified by real time digital simulation.

关 键 词：双母单分 中差差动 电流异常 电流互感器断线 实时数字仿真 

分 类 号：TM7[电气工程—电力系统及自动化]