电气主设备纵差保护的进展  

Progress of longitudinal differential protection for electrical main equipment

作　　者：王维俭[1] 张学深 田开华 郭玉恒 

机构地区：[1]清华大学电机系,北京100084 [2]许昌继电器研究所,许昌461000 [3]二滩水电站,攀枝花617000

出　　处：《继电器》2000年第5期6-8,共3页Relay

摘　　要：根据比率制动式纵差保护在运行中提出的问题 ,主要是电流互感器在外部短路暂态过程中造成的纵差保护不平衡电流增大和饱和效应使制动电流减少 ,可能产生误动作 ,发电机或变压器绕组短路时一侧可能存在不大的流出电流会影响保护动作的灵敏性 ,甚或造成保护拒动 ,这种流出电流可能是负荷电流 ,也可能是由短路安匝对健全绕组的互感所引起的感应电流。作者吸取国内外先进经验 。In terms of the problems occured during the ratio restraint longitudinal differential protection operating especially the restraint current is decreased owing to the increment of unbalanced current and saturation of the longitudinal differential protection caused by CT in external short circuit transient fault. Therefore maloperation will be resulted in. Moreover, a certain amount of out_flow current maybe exist on the primary side of generator or transformer at short circuit fault on windings. It will decrease the sensitivity of the protection or bring the protection in non_operation. The outflow current maybe load current, or maybe inductive current caused by transforming of short circuit fault to health windings. Advanced experiences at home and abroad are absorbed in this paper, together with analysis on internal fault at the main equipment, a new scheme for ratio restraint or longitudinal differential protection in scalar product restraint principle is proposed.

关 键 词：电气主设备 纵差保护 比率制动 标积制动 

分 类 号：TM772[电气工程—电力系统及自动化]