摘要
立体法检测架空线弧垂，是通过架空线平面外的一点，采用经纬仪精确地检测出弧垂值。方法易行，省时准确。
Free-space methool of detecting radian sag of overhead line is of accurate detecting radian say value with a theodolite across a point outside the plane of overhead line. The method can be easily carried out with time-Saving and accurancy
