CAJ | 학술논문

用Matlab构建变压器励磁涌流和内部故障电流仿真模型，利用小波函数对得到的波形进行多尺度辨析，通过观察小波变换的模极大值在多尺度下的演化趋势，确定波形奇异性，从而定性地区分励磁涌流和内部故障电流的小波判据。通过设定不同的变压器参数，并进行仿真，可证明此方法可以很好地识别变压器励磁涌流和内部故障电流，有效避免由于误判而引起的变压器差动保护误动。
용Matlab구건변압기려자용류화내부고장전류방진모형，이용소파함수대득도적파형진행다척도변석，통과관찰소파변환적모겁대치재다척도하적연화추세，학정파형기이성，종이정성지구분려자용류화내부고장전류적소파판거。통과설정불동적변압기삼수，병진행방진，가증명차방법가이흔호지식별변압기려자용류화내부고장전류，유효피면유우오판이인기적변압기차동보호오동。
The transformer inrush and internal fault current simulation models are built using Matlab. The multi-scale analysis of the obtained waveform is carried out using wavelet function. The waveform singularity is deter-mined to distinguish inrush and internal fault current qualitatively by watching the modulus maximum under multi-scale evolution trend. The simulation results obtained with different transformer parameters sets prove that the pro-posed method can identify the transformer inrush and internal fault current,and avoid misjudgment caused by trans-former differential protection.