一种测量介质损耗角的卷积窗加权算法  

Convolution window weighted algorithm of dielectric loss angle measurement

作　　者：历伟[1] 常宽[1] 

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870

出　　处：《河南城建学院学报》2015年第5期72-75,共4页Journal of Henan University of Urban Construction

摘　　要：目前,谐波分析法在高压容性设备介质损耗角的在线测量中得到了广泛的应用,但是该方法在非同步采样时存在频谱泄漏,严重影响介质损耗角的测量精度。分析了Blackman自卷积窗的频谱特性,提出了基于Blackman自卷积窗双谱线插值FFT的介质损耗角测量算法,并详细推导了介质损耗角的计算公式,最后利用计算机进行仿真验证,结果表明该算法能有效提高介质损耗角的测量精度。Harmonic analysis method is widely used to measurement of dielectric loss angle of high voltage capacitive equipment,however,this method has spectral leakage when non synchronous sampling and seriously affect the measurement accuracy of dielectric loss angle. In order to restrain the error,many academics have proposed many effective improved harmonic analysis methods. This paper analyzed the Blackman Self-convolution spectral characteristics,and proposed a double spectrum line interpolation FFT algorithm with Blackman convolution window,and deduced the formula for calculating the dielectric loss angle in detail. Finally,through computer simulation,the results showed that the Algorithm can improve the accuracy of measurement effectively.

关 键 词：介质损耗角 谐波分析法 Blackman自卷积窗 插值FFT 测量精度 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]