基于弧垂测量的分裂导线偏心覆冰监测方法

A Monitoring Method for Equivalent Icing Thickness of Conductor Under Complex Load Based on Sag Measurement

近年我国电网冰灾事故频发,输电线路覆冰监测对电网冰灾防治工作具有重要意义。弧垂作为导线覆冰后一明显变化量,可用于远程在线覆冰监测。实际工况中,由于地形、气象等因素的影响,导线覆冰往往呈现出异形覆冰的现象,这意味着实际导线会同时承受垂向载荷和偏心扭转,这对于实际线路安全极为不利。但现有的等值覆冰监测方法研究大多仅停留在均匀覆冰下单导线数值模型建立上,并未考虑偏心覆冰下分裂导线扭转对构型及弧垂的影响。因此,本文提出一种基于弧垂测量的分裂导线偏心覆冰监测方法,通过分析冰、风荷载、温度及偏心扭矩对导线构型的影响,建立导线等值覆冰厚度随最大弧垂、温度以及冰形变化的数值计算模型,能为实际的异形覆冰监测提供理论基础和实践依据。

In recent years,ice disaster accidents occur frequently in China's power grid.Monitoring of ice coating on transmission lines is of great significance to the prevention and control of ice disaster in power grid.As a significant change after ice coating on conductors,sag can be used for remote on-line ice coating monitoring.Under actual conditions,ice coating on conductors often presents a phenomenon of special-shaped ice coating due to the influence of topography,meteorology and other factors,which means that the actual conductors will bear both vertical loads and eccentric torsion,which is very unfavorable to the safety of actual lines.However,most of the existing equivalent ice coating monitoring methods only focus on the establishment of single conductor numerical model under uniform ice coating,and do not consider the impact of split conductor torsion under eccentric ice coating on configuration and sag.Therefore,a monitoring method for eccentric icing of split conductor based on sag measurement is proposed in this paper.By analyzing the influence of ice,wind load,temperature and eccentric torque on conductor configuration,a numerical calculation model for equivalent icing thickness of conductor changing with maximum sag,temperature and ice deformation is established,which can provide theoretical basis and practical basis for actual monitoring of special-shaped icing.