励磁绕组接地保护的分析  

Analysis of excitation-winding ground protection

作　　者：兰华[1] 袁天刚[1] 张木子[1] 王彬[1] 

机构地区：[1]东北电力大学,吉林吉林132012

出　　处：《黑龙江电力》2010年第6期408-412,共5页Heilongjiang Electric Power

摘　　要：针对切换式励磁绕组在无励磁条件下无法测量接地电阻的不足,通过外加直流电源对切换式励磁回路进行改进,对一点接地保护和两点接地保护进行分析。根据大量的仿真数据,测定的接地故障点位置、接地故障电阻的大小以及两接地点间的短路电流,构成了完善的励磁回路接地保护判据,提高了保护的灵敏度。Since switched excitation winding cannot measure ground resistance without excitation,this paper analyzes one-point and two-point ground protection through the improvement of switched excitation circuit.On the basis of a great number of simulation data,complete criteria for excitation circuit ground protection are formulated by measured position of fault,ground fault resistance and short circuit current between two ground contacts.Sensitivity is enhanced.

关 键 词：励磁绕组 接地保护 接地电阻 直流电源 

分 类 号：TM772[电气工程—电力系统及自动化]