变压器波形对称原理差动保护不对称度K的分析和整定  

ANALYSIS AND SETTING OF ASYMMETRY DEGREE K OF TRANSFORMER DIFFERENTIAL PROTECTION BASED ON SYMMETRY PRINCIPLE OF CURRENT WAVEFORMS

作　　者：苗友忠[1] 贺家李[1] 孙雅明[1] 

机构地区：[1]天津大学电气自动化与能源工程学院,天津300072

出　　处：《电力系统自动化》2001年第16期26-29,44,共5页Automation of Electric Power Systems

摘　　要：根据目前在变压器波形对称原理保护的不对称度 K整定中存在的问题 ,通过对变压器差动保护的各种区内故障模式进行了大量的 EMTP仿真 ,由数据分析获得 K的最小取值依据 ,并由仿真数据得出不对称度 K的选取与间断角的关系 ,从而提出了波形对称原理保护中不对称度 K的整定方法。对已有的励磁涌流波形进行了检验 。At present, there is a problem in the setting of asymmetry degree K of transformer differential protection based on the symmetry principle of current waveforms. A lot of EMTP simulations are done for various internal fault modes with asymmetry waveforms of transformer differential protection in this paper. Then the smallest value of asymmetry degree K is obtained by analyzing simulation data and the setting of asymmetry degree K is related to dead angle on magnetizing inrush current. The setting method of asymmetry degree K for preventing the mal-operations of transformer differential protection relay is also, proposed. The verification of magnetizing inrush current waveforms shows that the result is satisfactory.

关 键 词：三相变压器 波形对称原理 差动保护 不对称度 电力系统 

分 类 号：TM772[电气工程—电力系统及自动化]