CT混搭时变压器涌流识别问题分析  

Analysis on Transformer Inrush Recognition Problem in CT Mashup

作　　者：张臻[1] 程琤[1] 王慎杰[2] 

机构地区：[1]郑州航空工业管理学院,郑州450015 [2]武汉大学,武汉430072

出　　处：《高压电器》2015年第7期92-96,101,共6页High Voltage Apparatus

摘　　要：在常规变电站的数字化改造过程中,可能存在CT与ECT混合用于变压器差动保护的情况,这种情况是否会影响变压器的涌流识别以防止差动保护误动,这是必须要进行分析的问题。从变压器的涌流特性与识别判据入手,仿真了CT与ECT的传变特性,研究了涌流在CT饱和与未饱和时传变后差动电流中谐波的含量,分析了二次谐波制动判据的有效性,解答了CT混搭时变压器涌流识别的问题。In the digital renovation process of conventional substation, the circumstance may exist that CT and ECT mix in transformer differential protection. The problem needs to be analyzed that whether the circumstance would influence transformer inrush recognition to prevent differential protection＇s disoperation. The analysis starts from transformer inrush current characteristics and identification criterion. Transfer characteristics of CT and ECT is simulated, and the harmonic content of differential current after the inrush is transferred under saturated and unsaturated CT is studied, the validity of the second harmonic restraint criterion is analyzed, the transformer inrush recognition problem in CT mashup is answered.

关 键 词：CT混搭 变压器差动保护 涌流识别 CT饱和 

分 类 号：TM63[电气工程—电力系统及自动化]