变压器波形对称原理差动保护不对称度K的分析和整定

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，达到了预期的结果。

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

At present. there is a problem in the setting of asymmetry degree K of transformer differential protection based onthe symmetry principle of current waveforms. A lot of EMTP simulations are done for various internal fault modes withasymmetry waveforms of transformer differential protection in this paper. Then the smallest value of asymmetry degree K isobtained by analyzing simulation data and the setting of asymmetry degree K is related to dead angle on magnetizing inrushcurrent. The setting method of asymmetry degree K for preventing the mal--operations of transformer differential protectionrelay is also proposed. The verification of magnetizing inrush current waveforms shows that the result is satisfactory.