摘要
以每相7分支的拉西瓦发电机(单机700 MW)主保护的定量化设计为例,说明奇数多分支大型水轮发电机主保护设计与偶数多分支发电机的不同之处:首先应立足于如何使用不完全裂相横差保护,即根据发电机实际可能发生的故障特点,舍弃每相某一分支的同时实现对剩余偶数分支的合理分组(相邻或相隔方式);其次在不增加任何硬件投资的前提下,通过合理选择零序电流型横差保护的构成形式,可以对不完全裂相横差保护的保护性能起到很好的补充作用。相关设计思想将在奇数多分支大型水轮发电机主保护的设计中继续得以验证和完善。
Taking the quantitative design of main protection for Laxiwa hydro＇generator with seven branches per phase as an example,differences between the design for hydro- generator with odd branches and that for even branches are pointed out. The incomplete split -phase transverse differential protection should be used first to abandon one branch per phase according to possible fault features of different hydro- generators and the left even branches per phase are reasonably grouped at adjacent or alternating mode. The composition of zero- sequence current transverse differential protection is then rationally selected to supplement the protection performance to incomplete split- phase transverse differential protection without additional hardware investment. The quantitative and optimum design will be verified and improved during its practices in large- sized hydro-generators with odd branches.
出处
《电力自动化设备》
EI
CSCD
北大核心
2007年第2期6-10,共5页
Electric Power Automation Equipment
关键词
大型水轮发电机
奇数分支
主保护配置方案
定量化及优化设计
large-sized hydro-generator
odd branches
main protection configuration scheme
quantitative and optimum design
