张小钒,兰生.基于拟合波形相关性的变压器励磁涌流识别新方法[J].电测与仪表,2017,54(1):. ZHANG Xiaofan,LAN Sheng.A New Method to Identify Inrush Current Based on the Correlation of Waveform Fitting[J].Electrical Measurement & Instrumentation,2017,54(1):.
基于拟合波形相关性的变压器励磁涌流识别新方法
A New Method to Identify Inrush Current Based on the Correlation of Waveform Fitting
In order to improve the ability of transformer differential protection to identify inrush current and internal fault current, a new method based on the correlation of waveform fitting was proposed. First of all, using sine fitting method fitting the differential current waveform, then using the correlation analysis principle to calculate the correlation coefficient which is between differential current and it’s fitting curve. By using this correlation coefficient can identify inrush current and internal fault current. The simulation results show that: this method has clear principle, rapid identification, high distinguishability, strong anti-interference ability, and is easy to be implemented in the microcomputer.