疏绞型扩径钢芯铝绞线系列化研究

扩径导线在超高压和特高压输电工程中有很大的应用空间，有必要进行扩径导线系列化研究。以疏绞型扩径导线为研究对象，利用扩径导线结构稳定性计算软件对多个已建工程所用扩径导线进行结构稳定性计算，得到扩径导线结构稳定与否的判据，得到了相同扩径比下导线结构稳定的最大直径，或相同外径下导线结构稳定的最大扩径比；以临界跳股张力≥25％额定拉断力为结构稳定判定条件，得到不同扩径比条件下扩径导线经济性与结构稳定性的阶梯图。根据本研究结果，在输电工程中使用的扩径导线选型注重结构稳定性，保证了施工质量和运行安全。本研究成果可为输电线路采用疏绞型扩径钢芯铝绞线的设计选型和进一步实现该型号绞线的系列化提供参考。

Research on the Seriation of the Expanded Diameter Conductor with Less Strand of Inner Layer

Expanded diameter conductor with less strand of inner layer is chosen as the research object in this paper. By utilizing static calculation software developed by China Electric Power Research Institute, the static stability analysis on expanded diameter conductor adopted in previous projects are performed. The purpose of the research is to investigate maximum diameter under the same diameter expand ratio or maximum diameter expand ratio under the same diameter. Taken the 25％ rated tensile strength as the critical tensile, the ladder diagram of static and economic of the expanded diameter conductor under different diameter expand ratio is achieved. According to analysis results, the expanded conductor adopted in previous projects meet safety requirement. The analysis results can be used in application of expanded diameter conductor in future.