【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 ,达到了预期的结果更多还原

【Abstract】 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.更多还原