Sequence parameters and unbalance level in parallel untransposed 4-circuit transmission lines and lightning shielding line with length of 2 km is calculated on basis of Carson model.

• 以卡森模型为基础 ,对一段 2km未换位的同杆并架 4回输电线及避雷线的试验线路 ,用Matlab仿真计算了序参数及线路不平衡度。