强风沙地区输电线路新型耐磨金具性能研究

Research on Performance of Novel Wear-resistant Fittings for Transmission Lines in Strong Windy Sand Areas

我国西北部地区大风沙尘天气发生频率高、持续时间长,传统连接金具在运行时会发生剧烈磨损,严重影响架空输电线路的安全可靠运行。为解决这一问题,优选3种合金钢35CrMo、45Mn2、GCr15作为新型耐磨金具候选材料,选取"环-环"和"槽型"两种连接结构的典型金具采用新制的耐磨金具进行试制,对试制金具开展了破坏载荷、硬度及台架磨损试验。结果表明,采用GCr15钢制造的连接金具脆性倾向大,且生产程序复杂,制造成本较高,不适于作为新型耐磨金具材料,而采用35CrMo和45Mn2钢制造的连接金具的耐磨性能明显优于传统连接金具的,可在强风沙地区架空输电线路中推广应用。

The windy and dusty weather with high frequency and long duration is the characteristic of northwest China,which results in severe wear of link fittings during service and seriously influencing the safe and reliable operation of overhead transmission lines. To solve the problem, three types of alloy steels including 35 CrMo, 45 Mn2 and GCr15 were selected as potential candidate materials for novel wear-resistant fittings. The connection fittings with "ring-ring" coupling and "clevis and tongue" coupling were successfully trial-produced by using the novel wear-resistant fittings.The failure load, hardness and bench wear tests of the trial fitting were carried out. The results show that the fittings produced by GCr15 steel exhibit a significant brittleness tendency. Combined with the consideration of complicated production procedure and high manufacturing cost, GCr15 steel is not suitable for wear-resistant fitting materials. In contrast to this, the fittings produced by 35 CrMo and45 Mn2 steels displays an obviously better wear resistance than that of the conventional fittings, which can be applied in overhead transmission lines in strong windy sand areas.