摘要
为分析输电线路非均匀脱冰动态特性,以实际220 kV两档输电线路为研究对象,利用ABAQUS有限元软件对线路非均匀脱冰典型工况进行了数值模拟,研究了脱冰方式、脱冰率和非脱冰档覆冰厚度等因素对脱冰跳跃和档间不平衡张力的影响,并通过单档脱冰试验验证了模拟结果的有效性.结果表明:单档完全脱冰时,相邻档覆冰厚度增加,脱冰档跳跃高度减小,但最大不平衡张力显著增大,两档覆冰厚度相近时,非脱冰档反向位移较大;单档局部脱冰时,脱冰率越大,两档跳跃幅值越大,且较大的脱冰率会使最大不平衡张力显著增加,脱冰率相同时,4种脱冰方式中两侧端部脱冰引起的动力响应最弱,是较为安全的除冰方式.
In order to analyze the dynamic characteristics of non-uniform ice-shedding of transmission lines,the finite element model of a 220 kV two-span transmission line was established and the finite element numerical simulation of single-span non-uniform ice-shedding conditions was carried out by means of ABAQUS software.The influences of a number of factors to the displacement and the unbalanced tension of conductor were investigated,such as ice-shedding mode,ice-shedding rate and ice thickness of the non-deicing span.The validity of modeling results is verified by comparing with test data.The results show that on the condition of ice-shedding entirely in single span,the maximum jump height of deicing span decreases and the maximum unbalanced tension increases significantly with icing thickness of non-deicing span,the maximum reverse displacement of non-deicing span is greater when the ice thickness of two spans is close;on the condition of ice shedding partly in single span,larger ice-shedding rate leads to greater jump heights of two spans,and the maximum unbalanced tension increases significantly with ice-shedding rate when ice-shedding rate is large,if ice-shedding rate is constant the dynamic response caused by ice-shedding from both sides to the middle is weakest among the four ice-shedding modes,and this ice-shedding mode is relatively safe in condition of single-span deicing.
作者
许燕飞
徐鹏
李海涛
高玉波
孙滔
XU Yanfei;XU Peng;LI Haitao;GAO Yubo;SUN Tao(School of Science, North University of China, Taiyuan 030051, China;State Grid Shanxi Economic Research Institute, Taiyuan 030002, China)
出处
《测试技术学报》
2022年第3期244-251,271,共9页
Journal of Test and Measurement Technology
基金
山西省研究生创新资助项目(2020SY386)
国家自然科学基金资助项目(11902294)
山西省应用研究基础研究资助项目(201801D121112)
国网山西电力公司科技资助项目(520533170007)。
关键词
输电线路
脱冰动力响应
跳跃高度
不平衡张力
transmission line
ice-shedding dynamic response
jump height
unbalanced tension
