输电线压弯除冰机理研究

输电线路除冰应满足有效除冰且不损伤导线。结合覆冰脆性材料的特点,提出了一种压弯除冰的方法,即约束一段覆冰导线,在破冰轮的作用下使其压弯,使覆冰从导线上破碎脱落。通过推导覆冰导线弯曲应力方程,建立了覆冰导线实体模型,分析其在不同破冰轮半径、覆冰厚度和加载力下的覆冰和导线的应力变化。结果表明:覆冰挤压应力和弯曲应力随着加载力的增加而增大,在计算参数范围内,均超过导线覆冰的破碎强度,且导线应力未超过破坏强度,验证了压弯除冰方法的可行性。破冰轮半径和覆冰厚度增加,不利于压弯除冰。推导的覆冰导线弯曲应力公式可为设计压弯除冰机器人提供参考,为保证线路有效除冰,可适当增大加载力以达到理想的除冰效果。

Research on Bending De-icing Mechanism of Transmission Line

Transmission lines de-icing should be effectively done and should not cause any damage to the conductor. Considering the brittle characteristics of the ice-covering materials, this article puts forward a deicing method by bending, i.e. to restrict a length of ice-covering conductor and bend it by using ice breaking wheels so that the covered ice will be crushed and fall off from the conductor. By deriving the equation of bending stress of ice-covered conductor, a solid model of ice-covering conductor is built and the changes of covered ice and conductor stress are analyzed under different radius of ice breaking wheels, different thickness of ice cover and different loading force, respectively. The results show that compressive stress and bending stress grow with an increase of loading force. Within the range of calculated parameters, both of them exceed the crushing strength of covered ice, however, the conductor stress is under the crushing strength, proving that this bending-based deicing method is feasible. On the other hand, it also proves that the increase in the radius of ice breaking wheels and the increase in the ice thickness are not preferred. The derived formula of bending stress of ice covering conductors can provide a reference for the design of deicing equipment. To ensure effective deicing, an appropriate additional loading force can help achieve the desired deicing result.