基于相电流制动的发电机故障分量单元件横差保护  

New Unit-transverse Differential Protection Based on the Fault Contributed Zero Sequence Current

作　　者：崔新奇[1] 邰能灵[1] 刘静[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海市200240

出　　处：《电力系统自动化》2007年第12期61-63,共3页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50577042)~~

摘　　要：单元件横差保护是发电机的一种简单、灵敏的主保护,在条件允许时应优先采用。分析了横差保护不平衡电流的成因,在此基础上提出一种基于相电流制动的故障分量单元件横差保护方案,以期从原理上减少不平衡电流对保护性能的影响。由于一般仅用一个电流互感器,因此横差保护电流互感器的选择必须考虑到暂态特性的要求。文中对单元件横差保护防止电流互感器饱和及其选型进行了研究,提出了相应的技术措施。The unit-transverse differential protection is usually the first choice for generator protection. As there exists the unbalanced current with the generator running, its performance will be greatly affected. Following an analysis on the characteristics of the unbalanced current, some countermeasures are presented, including a new unit-transverse differential protection based on the fault contributed zero sequence current. As the fault current with the large generator is great and will make the current transformer saturated, which usually lowers the protection sensitivity, corresponding technological measures are also proposed.

关 键 词：单元件横差保护 电流互感器 故障分量 零序电流 饱和 

分 类 号：TM307.1[电气工程—电机]