采样值电流差动保护动作模糊区分析  

Analysis of action fuzzy area of sampled value current differential protection

作　　者：张方军[1] 乐秀璠[2] 

机构地区：[1]浙江机电职业技术学院电气工程学院,浙江杭州310002 [2]河海大学电气工程学院,江苏南京210098

出　　处：《电力自动化设备》2004年第8期81-84,共4页Electric Power Automation Equipment

摘　　要：电流数据采样的离散性和采样初始时刻的不确定性是导致采样瞬时值电流差动保护动作值模糊区产生的根本原因。定量分析了采样瞬时值电流差动保护常用的R点中取S点判据在S取不同值时,动作电流和制动电流可能的变化情况及其保护的效果,并与常规相量电流差动保护的保护效果进行比较,当采样瞬时值电流差动保护处于动作的模糊区时投入辅助判据进行判断,结果表明:这样既利用了采样瞬时值电流差动保护动作速度快的优点,又消除了采样值差动保护的动作模糊区的影响。The decentralization of sampled value and the uncertainty of sampled time bring forth the action fuzzy area of sampled value current differential protection. The criterion of ' S points from R points',which is normally adopted in sampled value current differential protection,and its protective effect are quantitatively analyzed for different S values,and compared with that of normal vector current differential protection. The assistant criteria are applied when the sampled value current differential protection is within fuzzy area,which avoids the influence of fuzzy area while takes the advantage of sampled value differential protection's rapid action.

关 键 词：采样值 模糊区 差动保护 

分 类 号：TM773[电气工程—电力系统及自动化]