中文摘要：

在不同电压等级同塔多回线路中，可能出现分裂数不同的导体同时存在的情况，为此在线路无线电干扰的计算中，提出了混合法，即在同塔多回线路中，混合应用经验公式法和激发函数法，分别计算导体分裂数小于4和大于等于4线路的干扰场强，再将80％值进行叠加，从而得到合成场强。将混合法应用于南雁220kV／500kV同塔四回线路无线电干扰特性分析中，结果表明：混合法能够准确反映线路几何参数、电气参数和排列方式变化所导致的无线电干扰场强值变化的趋势：导体距地最小高度等距离增加，混合法计算结果均匀减小；测量点与杆塔中心线的距离变化时，混合法计算结果的波动比较大。

英文摘要：

In multi circuits belonging to different voltage classes on the same tower, the conductors with different splitting number may exist simultaneously, for this reason, to calculate radio interference （RI） caused by transmission circuits at this occasion a calculation method called as hybrid method is put forward, i.e., in the occasion of multi circuits on the same tower the interference field strength of conductor with splitting number less than 4 and that of conductor with splitting number larger than or equal to 4 are calculated by empirical formula and excitation fimction method respectively, then the calculated values of interference field strengths with confidence level of 80% dur/ng eighty percent of time are superposed to obtain resultant field strength. Applying this hybrid method to characteristic analysis of radio interference caused by four circuits belonging to 220 kV and 500 kV on the same tower, the results show that hybrid method can accurately reflect the variation trend of RI field strength due to the variation of geometrical parameters and electrical parameters of transmission lines as well as the change of arrangement mode of transmission lines; when the heights of conductors to the ground increase equidistantly, the calculation results obtained by hybrid method decrease uniformly; when the distance between the measuring point and center line of tower varies, the RI field strength calculated by hybrid method fluctuates.