基于Friis传输方程的局部放电定量计算方法研究

特高频法监测电缆及GIS局部放电时需要对放电量进行精确地标定,以判断局部放电严重程度。文中提出一种利用Friis传输方程对局部放电定量计算的方法,该方法将局部放电源作为发射天线模型化处理,并引入Friis传输方程,将计算等效为天线传输过程,应用HFSS仿真得到的四阶Hilbert分形天线作为接收天线模型。通过局部放电试验与计算分析验证,确定了局部放电量与接收特高频信号的能量呈二次曲线的关系。

Calculation Model of the Discharge Capacity Base on Friis Transmission Equation

In order to determine the severity of partial discharge,precise calibration in the amount of discharge is re-quired for the application of ultra-high frequency in cable and GIS partial discharge monitoring.In this paper,a meth-od for the calculation of partial discharge based on Friis transmission equation is presented, which integrates partial discharge source as a transmitting antenna modeling and introduces Friis transmission equation to make the calculation equivalent to the transmission process of the antenna.By taking the fourth-order Hilbert fractal antenna resulting from HFSS simulation as receiving antenna model,and utilizing partial discharge tests,calculation and analysis,the quad-ratic curve relationship between partial discharge and the energy of receiving UHF signals is determined.