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利用改进型波形相关法鉴别励磁涌流的研究
引用本文:林湘宁,刘沛,杨春明,刘世明.利用改进型波形相关法鉴别励磁涌流的研究[J].中国电机工程学报,2001,21(5):56-60,70.
作者姓名:林湘宁  刘沛  杨春明  刘世明
作者单位:1. 华中科技大学电力系,;东方电子信息产业集团综自所,
2. 华中科技大学电力系,
3. 东方电子信息产业集团综自所,
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通,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。

关 键 词:励磁涌流  改进型波形相关法  鉴别  变压器  差动保护
文章编号:0258-8013 (2001)05-0056-05

STUDYS FOR IDENTIFICATION OF THE INRUSH BASED ON IMPROVED CORRELATION ALGORITHM
LIN Xiang-ning,LIU Pei,YANG Chun-ming,LIU Shi-ming.STUDYS FOR IDENTIFICATION OF THE INRUSH BASED ON IMPROVED CORRELATION ALGORITHM[J].Proceedings of the CSEE,2001,21(5):56-60,70.
Authors:LIN Xiang-ning  LIU Pei  YANG Chun-ming  LIU Shi-ming
Affiliation:LIN Xiang ning 1,2,LIU Pei 1,YANG Chun ming 2,LIU Shi ming 1,2
Abstract: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.
Keywords:transformer differential protection  internal fault  inrush  improved waveform correlation algorithm
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