架空地线共振除冰仿真分析

Simulation Analysis of Resonant Deicing of Overhead Ground Wire

架空地线覆冰是威胁电网安全的常见自然灾害之一。进行架空地线共振除冰仿真分析可验证共振除冰技术的可行性,对其共振除冰方案的设计具有重要意义。因此,运用ANSYS Workbench有限元分析软件建立了地线-覆冰系统的有限元模型,分析了单档覆冰地线在简谐激振下共振的动态响应。提出一种基于无应力原长的找形方法,计算了地线、地线-覆冰系统仅在重力作用时,地线的应力与弧垂,并计算了单档覆冰地线的固有频率及振型,模拟了地线-覆冰系统在不同激振点施加不同激振频率激振力的除冰效果。经过比较,频率为7.655Hz的激振施加在距悬挂点5 m或15 m处时可获得较好的除冰效果,激振力仅需1000N。该研究为共振式除冰方案及共振除冰机的设计提供了参考。

Overhead ground wire icing is one of the common natural disasters that threatening the safety of the power grid.Verifying the feasibility of resonant deicing technology through the simulation analysis of overhead ground wire resonant deicing is of great significance for the design of resonant deicing scheme.The finite element model of the ice-covered ground wire system is established and the dynamic response of the single-file ice covered ground wire under harmonic excitation is analyzed by ANSYS Workbench.A form-finding method based on non-stress original length is proposed.The stress and arcs of ground wire and ice-covered ground wire under the action of gravity alone are calculated.The natural frequency and vibration mode of single file ice-covered ground wire are calculated,and the deicing effect of ice-covered ground wire with different vibration frequencies is simulated.The comparison shows that the best deicing effect can be achieved when the vibration with a frequency of 7.655 Hz is applied at 5m or 15m away from the suspension point,with an excitation force of only 1000 N.This study provides reference for the design of resonant deicing schemes and resonant deicing machines.