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利用改进型波形相关法鉴别励磁涌流的研究 预览 被引量:54

STUDYS FOR IDENTIFICATION OF THE INRUSH BASED ON IMPROVED CORRELATION ALGORITHM
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摘要 提出了一种基于相关分析的变压器励磁涌流识别判据,该判据通过改进的最大面积法重组一周波数据窗内的采样信号,通过比较其前后半周波波形的相关性来区分励磁涌流和故障电流。仿真和动模试验表明,该判据能正确识别各种情况下产生的励磁涌流,在变压器带长线发生内部故障、内部故障与励磁涌流并存及CT特性较差的情况下,仍能快速正确地启动出口动作,具有较好的鲁棒性。该方法算法简单,能在现有的硬件平台上实现。 A new scheme based on improved correlation algorithm to distinguish between inrush and internal fault occurred in the transformer is proposed.In this scheme,the post fault current of each phase in one cycle is reorganized as a new measurand. Thereby, fault currents can be distinguished from the inrushes if the improved correlation coefficient between the pre half and the post half cycle of the measurand is larger than the setting value.Test results show that all types of internal faults even accompanied by magnetizing inrush can be correctly identified from the inrush with the proposed algorithm. Besides with high reliability , this scheme has satisfying sensitivity. Furthermore, this algorithm can be easily implemented in the real time process.
作者 林湘宁 刘沛 杨春明 刘世明 LIN Xiang ning 1,2 , LIU Pei 1, YANG Chun ming 2, LIU Shi ming 1,2 (1.Huazhong University of Science and Technology,Wuhan 430074,China; 2.Group of DongFang Electronic Information Technology,Yantai 264001,China)
出处 《中国电机工程学报》 EI 北大核心 2001年第5期 56-60,70,共6页 Proceedings of the CSEE
关键词 励磁涌流 改进型波形相关法 鉴别 变压器 差动保护 transformer differential protection internal fault inrush improved waveform correlation algorithm
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