用波形拟合法识别变压器励磁涌流和短路电流的新原理  

NEW PRINCIPLE OF DISCRIMINATION BETWEEN INRUSH CURRENT AND FAULT CURRENT OF TRANSFORMER BASED ON FORECASTED WAVEFORM

作　　者：李贵存[1] 刘万顺[1] 刘建飞[1] 滕林[1] 刘勇[2] 

机构地区：[1]华北电力大学北京研究生部,北京100085 [2]北京哈德威四方保护与控制设备有限公司,北京100085

出　　处：《电力系统自动化》2001年第14期15-18,共4页Automation of Electric Power Systems

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 。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.

关 键 词：励磁涌流 短路电流 波形拟合法 识别 变压器 差动保护 

分 类 号：TM401[电气工程—电器]