Time delay estimation for UHF signals in PD location of transformers

被引:0
|
作者
Yang, L [1 ]
Judd, MD [1 ]
Bennoch, CJ [1 ]
机构
[1] Univ Strathclyde, Inst Energy & Environm, Glasgow, Lanark, Scotland
来源
2004 ANNUAL REPORT CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA | 2004年
关键词
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Time delay estimation (TDE) is essential for PD location using the UHF technique. However, noise and effects of multi-path propagation are two main problems affecting the accuracy of the estimate. Comparing two methods, which are based on cumulative energy curve and power curve respectively, a cross correlation based method is employed to achieve the estimation. A high-pass filter is applied to the UHF signal to eliminate operating noises. The phase characteristic of the filter is designed to be linear for making the time delay a constant in terms of frequency. A window in the time domain is selected to reduce the effect of multi-path propagation.
引用
收藏
页码:414 / 417
页数:4
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