恢复性涌流引起变压器差动保护误动分析  

Analysis of the maloperation of transformer differential protection caused by recovery inrush

作　　者：游复生[1] 

机构地区：[1]广东省电力设计研究院,广东广州510663

出　　处：《电力系统保护与控制》2008年第15期85-87,共3页Power System Protection and Control

摘　　要：一般认为变压器区外故障切除后,出现的涌流情况与空载合闸一致,通过一起变压器区外故障切除后,恢复性涌流引起变压器保护误动为例,分析变压器区外故障切除后的电磁暂态全过程,分析恢复性涌流的成因,说明了影响恢复性涌流的因素,通过数字仿真模型和动模数据分析,说明变压器外部故障恢复性涌流本身不会造成差动保护误动作,而是变压器各侧电流互感器的暂态特性不一致形成的差流造成的,在此基础上提出处理方案,问题得到解决。It is said that, when the fault which is outside the transformer is being cleared, it will cause current inrush. This situation is just like the no-load switch-on. This paper takes a real malfunction of transformer differential protection as an example, and gets the reason of recovery inrush by analysing the electromagnetism transient process. And then it builds a digital model and a physical mode to analyze this situation. At last, the conclusion is reached that the differential current caused by the different transient characteristic of current transformer caused the malfunction of differential protection but not the recovery inrush. A reorganization scheme is proposed.

关 键 词：差动保护 恢复性涌流 变压器 

分 类 号：TM407[电气工程—电器]