摘要
为研究局部放电特高频天线接收信号的拖尾现象,从天线传递函数的角度分析了信号拖尾的影响因素—传递函数幅值平坦度和群延迟平坦度。结合现有的UHF天线等效高度标定系统,提出了两个参数的获取方法。以6支常用的UHF天线作为研究样本,利用GTEM小室和脉冲信号源研究了各天线的时域脉冲响应,分别提取了两个平坦度参数,并与拖尾现象的表征参数最大相关系数和振荡系数做相关运算。结果表明,传递函数幅值平坦度与拖尾现象的相关系数达到0. 57以上,群延迟平坦度与拖尾现象的相关系数达到0. 87以上。对同一模拟放电源进行验证,幅值平坦度和群延迟平坦度对拖尾时间的相关系数分别为0. 58和0. 91。试验结果证明了两个特征参数的有效性,为UHF天线的设计和选型提供依据。
For the analysis of the trailing phenomenon of the partial discharge signal acquired by UHF antenna,the influence of the UHF signal tailing are analyzed based on the transfer function of the UHF antenna-the amplitude flatness of transfer function and the group delay flatness.The calculation method of the two flatness parameters is proposed based on the existing UHF antenna effective height calibration system.The time domain impulse response of six UHF antennas are acquired by the measurement platform consisted by a GTEM cell and a pulse signal generator,and the two flatness parameters are extracted respectively.The maximum correlation coefficient and the oscillating coefficient are extracted which are used to describe the tailing phenomenon,and the correlation of the two flatness parameters are calculated.The results show that the correlation of the amplitude flatness of transfer function and tailing phenomenon is greater than 0.57,and the correlation of the grope delay flatness and tailing phenomenon is greater than 0.87.The UHF signals are acquired in the same simulated partial discharge source,the correlation of the amplitude flatness and tailing time is 0.58,and the correlation of the grope delay flatness and tailing time is 0.91.The experimental results prove the effectiveness of the two parameters,and provide the basis for UHF antenna design and type selection.
作者
王海燕
蒋成博
卢健
潘明
张永辉
袁端磊
Wang Haiyan;Jiang Chengbo;Lu Jian;Pan Ming;Zhang Yonghui;Yuan Duanlei(Technical Center of Pinggao Group Co.,Ltd.,Pingdingshan 467000,Henan,China)
出处
《电测与仪表》
北大核心
2019年第2期145-152,共8页
Electrical Measurement & Instrumentation
关键词
局部放电
特高频信号
拖尾现象
传递函数
群延迟
平坦度
partial discharge
UHF signal
tailing phenomenon
transfer function
grope delay
flatness
