分裂导线覆冰扭转特性分析及等值覆冰厚度计算  

Study on Torsion Characteristic and Equivalent Ice Thickness of Bundle Conductors

作　　者：胡琴[1] 于洪杰[1] 徐勋建[2] 舒立春[1] 蒋兴良[1] 邱刚[1] 李瀚涛[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044 [2]电网输变电设备防灾减灾国家重点实验室(国网湖南省电力公司防灾减灾中心),湖南省长沙市410007

出　　处：《电网技术》2016年第11期3615-3620,共6页Power System Technology

基　　金：国家电网公司科技项目(5216A5140018);国家自然科学基金项目(51377180)~~

摘　　要：覆冰在线监测对输电线路防、融冰方案的制定具有重要作用,而分裂导线和单导线覆冰特性的差异使得两者覆冰厚度计算方法不同。由于导线扭转特性的不同,同一档距内分裂导线和单导线覆冰形态存在明显差异。比较偏心覆冰单导线和分裂导线档距中部的扭转角度可知,相同覆冰厚度时后者是前者的10.2%。为实现分裂导线等值覆冰厚度的实时监测,提出将分裂子导线的覆冰等效为单根导线的覆冰。根据力矩平衡关系,建立以悬挂绝缘子轴向拉力、倾角为输入参量的力学计算模型,并在雪峰山试验基地开展了耐张塔3分裂导线覆冰测量。结果表明:利用计算模型得到的综合荷载等值覆冰厚度和基于称重法得到的人工测量结果吻合较好,两者相对误差为7.8%,从而验证了模型的有效性。On-line monitor of transmission line plays an important role on anti-icing and de-icing, while calculations of ice thickness of single and bundle conductors are different. Difference of asymmetric ice shape between single and bundle conductors is caused by torsional stiffness. Comparison of torsional angles on middle span length of transmission line indicates that torsional angle of bundle conductor is 10.2% of that of single conductor. In order to monitor ice thickness of bundle conductors in real-time, mechanical calculation model based on parameters of obliquities and tension at suspending point of insulator strings is proposed. Manual measurement of ice thickness on 3-bundle conductor was carried out on Xuefeng Mountain Experimental Base. Field test results indicated that prediction obtained with the model agrees with manual measurement based on weighting method with relative error 7.8%, thus verifying validity of the model.

关 键 词：在线监测 等值覆冰厚度 分裂导线 力学模型 冰层扭矩 

分 类 号：TM75[电气工程—电力系统及自动化]