电工技术学报2012，Vol.27Issue(5)：99-104,6.
基于小波变换的导线绝缘故障定位方法
Method of Wire Insulation Fault Location Based on Wavelet Transform
摘要
Abstract
A mathematical model of aerospace wire insulation faults is presented based on time domain reflectometry （TDR） in this article. Transmission in a defective lossy is simulated for step wave of different rise time. The results show that steep leading edge of incident signal is conducive to find out small insulation faults, and simultaneous attenuation of high frequency signals results in smooth reflected wave, which leads to errors in locating the starting point of peaks corresponded to faults. A TDR test platform is built to detect small insulation faults. Soft threshold de-noising method of wavelet is used to eliminate noise in received signals, and then the starting point of peaks corresponded to faults is ascertained by continuous wavelet transform. Test results indicate that wavelet method helps to identify failure points, and to improve the accuracy of faults location. Minimum length of faults found in experiment is 5cm and positioning error is less than 2%.关键词
时域反射法/航空导线/绝缘故障检测/小波Key words
Time domain reflectometry/aerospace wire/insulation fault detection/wavelet分类
信息技术与安全科学引用本文复制引用
张俊民,周小猛,魏娟,曹大树,姚红宇..基于小波变换的导线绝缘故障定位方法[J].电工技术学报,2012,27(5):99-104,6.基金项目
民航安全技术分析和鉴定实验室开放研究基金资助项目（200603）. （）
