基于Friis传输方程的放电量计算模型

应用特高频方法监测变压器局部放电时需要对放电量进行精确地的标定,通过设计计算模型,建立UHF信号能量与放电量的关系,以通过直观的指标来判断局部放电量,评估设备运行状况.通过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.并以应用HFSS仿真得到的4阶Hilbert分形天线相关参数为模型,通过理论推导和计算,确定局放量与接收特高频信号的能量呈二次曲线的关系.通过由搭建的放电模型收集的测量试验数据统计结果显示,UHF信号能量与放电量存在二次曲线关系,与理论模型相符.

Calculation model of the discharge ccapacity with friis transmission equation

Required discharge amount when applying UHF partial discharge transformer to detect precisely calibrated,the paper model design,build relationships UHF signal energy and discharge capacity,through visual indicators to determine the amount of partial discharge,assessing equipment operation situation.In this paper,the partial discharge source model as a transmitting antenna processing,and the introduction of Friis transmission equation,the calculation is equivalent to the antenna transmission.Experimental data measured by the statistical model built discharge collectible display,UHF signal energy and the discharge amount quadratic relation is consistent with the theoretical model.