摘要
根据局部放电超高频窄带信号的特征,分别介绍了利用Nyquist采样技术、混频技术和窄带抽样技术实现局部放电超高频窄带信号监测的三种方法。且以低通采样和带通采样理论分析并对比了这三种方法的工作原理。在实验室利用数字仿真技术代替部分硬件实现了三种方法能够同时获取同一超高频信号经过不同带通滤波器后的窄带信号。仿真实验结果分析表明:混频技术可降低超高频窄带信号采样频率并保留其峰值和相位特征;而窄带抽样技术则能够恢复信号的超高频窄带分量,且保存了局部放电信号在此窄频带内较完整的信息。这为研制具有不同功能的局部放电超高频信号在线监测与诊断系统提供了试验依据。
In this paper, the monitoring techniques are introduced based on Nyquist sampling, frequency-mixing and narrow-band sampling respectively according to the characteristic of the ultra-high-frequency （UHF） partial discharge （PD） signal in narrow-band. The principle of these monitoring techniques for the signal is showed by analysis and comparison with the low-pass and band-pass sampling theory. Signals in different narrow-band of the same UHF PD are realized using numerical simulation technology in place of some hardware in laboratory. The result of simulation test indicates that the frequency-mixing technology keeps the peak value and phase characteristics with reducing the sampling frequency, and the narrow-band sampling technique can reconstruct the signal exactly with preserving full information. This provides the experimental proof of developing the on-line UHF PD monitoring and diagnosis system with different functions.
出处
《电工技术学报》
EI
CSCD
北大核心
2008年第1期7-12,共6页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(50377034)
作者简介
司文荣 男，1981年生，博士研究生，从事局部放电检测技术研究。
李军浩 男，1980年生，博士研究生，从事局部放电检测技术研究。
