【摘要】 提出了一种利用波形特征区分变压器励磁涌流和内部故障的新方法。该方法基于涌流波形畸变严重的基本思想 ,能够利用较短的数据窗 ,预测出相应的标准正弦波 ,通过分析实际采样波形与标准正弦波的相似程度来区分变压器励磁涌流和内部故障。理论分析和 EMTP仿真均表明 :该方法数据窗较短 ,特征明显 ,识别正确 ,不受电流互感器饱和的影响等更多还原

【Abstract】 A new algorithm based on the waveform characteristics is presented for discriminating between inrush current and fault current of power transformers.The standard sinusoidal waveform is extracted from fault current or inrush current with a short-time sampling data window.By analyzing the similarity of practical sampling waveform and the forecasted standard sinusoidal waveform,the inrush current can be correctly identified from internal faults.Theoretic analysis and simulations show that this method is not only simple,but of highly effective.更多还原