文档介绍：第 47 卷第 7A 期电测与仪表
2010 年 7 月 Electrical Measurement & Instrumentation Jul. 2010
变压器励磁涌流的FFT和小波分析*
胥杰,张永健,高亮
(上海电力学院,上海)
200090
从工程应用的现状来看,世界上大多数国家都将纵联差动保护作为变压器主保护变压器的差动保护,一
摘要: 。
方面需要面对主设备保护共同的保护问题,另外一方面还需要面对变压器特有的励磁涌流问题要保证差动
TA 。
保护的选择性与灵敏性,就必须躲过变压器外部故障时的最大不平衡电流,同时正确的识别空载合闸励磁涌流
和内部短路故障电流本文利用和小波分析,对变压器励磁涌流产生机理及特征分析进行了研究并利用
。 FFT 。
软件的工具箱对变压器模型在空载合闸状态进行仿真,并利用
MATLAB SIMULINK/PSB POWERGUI/FFT analysis
和小波分析工具箱对涌流波形进行分解,获取变压器保护中辨识励磁涌流的有利信息
GUI 。
励磁涌流; ;小波分析; 仿真
关键词: FFT MATLAB
( )
中图分类号:TM933 文献标识码:A 文章编号:1001- 1390 2010 7A- 0001- 04
Inrush Current Analysis Based on FFT and Wavelet
XU Jie, ZHANG Yong- jian, GAO Liang
( )
Shanghai University of Electric Power, Shanghai 200090, China
Abstract: From the view of engineering, most countries in the world use differential protection as main protection of
,
transformer. On the one hand transformer differential protection needs to face mon TA protection of the main
equipment also have to face on the other hand, the transformer inrush current problem. In order to ensure the selective
and sensitive, it is necessary to avoid the failure of the transformer of the largest external imbalances in current, at the
same time switch on the correct identification of no- load inrush current and internal short circuit fault current. In this
paper, mechanism and characteristics of the transforme