在输电线路施工中，弧垂观测是架线分部工程中重要的控制项目。
During transmission line construction, sag observation is an important control item of stringing.
架空线路应力控制气象条件的判定，需要考虑控制气象条件及弧垂限制等条件，一般采用临界档距判定法或试推比较法处理。
In order to judge the climate condition control of overhead-line stress, it is of necessity to take account of climate condition control and hang-arc-distance restraint.
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