电工技术学报2024，Vol.39Issue(7)：2174-2183,10.DOI:10.19595/j.cnki.1000-6753.tces.230049
基于记忆合金双程形状记忆效应的导线雾凇防冰方法及现场试验
Research on Anti-Icing Method for Fog Freezing and Field Test of Wires Based on Two-Way Shape Memory Effect of Memory Alloy
摘要
Abstract
Atmospheric icing of conductors poses a serious threat to the safe operation of power system.A large number of studies have been carried out to suppress conductor icing at home and abroad.The electric field has an impact on the conductor icing.When the electric field strength is large enough,the electric field can restrain the conductor icing.Based on the two-way shape memory effect that shape memory alloys maintain different shapes at different temperatures,this paper proposes an anti-icing method of wires without manual intervention.It arranges shape memory alloys on the surface of wires and use its deformation to change the electric field strength on the surface of wires to inhibit wire icing. A three-dimensional model of the shape memory alloy wire was established,and the surface electric field was simulated and analyzed.The results show that the electric field strength of the wires'surface gradually increases with the growth of the shape memory alloy deformation. In order to test and verify this anti-icing method,the field natural icing experiment of LGJ-150/25 conductors was carried out at Xuefeng Mountain Energy Equipment Safety National Observation and Research Station of Chongqing University.With two ends bent upward,cylindrical aluminum bars arranged on conductors'surface were used to replace the shape memory alloy.The icing tests under natural conditions are extremely difficult to control.Even if facing the same test subject,the change in temperature,wind speed,liquid water content,and the median diameter of water droplets will affect the test results.In order to reduce the influence of changes in the natural environment,this paper uses the rotational cylinder reference method. Through five sets of valid experimental data,the conclusion is as follows:(1)The shape of wire icing with four cylindrical aluminum bars under different initial electric fields is different.When the initial electric field strength is low,the ice-covered branches have long branches and clear gaps.When the field strength increases,the cuspid ion bombardment effect is strengthened,the electric suction changes,icing tip is rounded.(2)Shape memory alloys arranged on the wires'surface effectively suppress fog freezing.With the initial electric field strength of the wire increases,cylindrical aluminum bars promote the fog freezing,then inhibit.Its suppression trend on icing gradually decreases.(3)There is a best electric field strength interval.As the shape of the aluminum strip is certain,interval is only related to the initial electric field strength of wires'surface.For length of one meter LGJ-150/25 conductor,in an initial electric field strength of 10 kV/cm,compared with no aluminum bars,the arrangement of four aluminum bars have a suppressed effect on fog freezing.Its quality and thickness of reduction percentage are 57.1% ,48.7% respectively. Experiments have verified the effectiveness of the anti-icing method for fog freezing.Shape memory alloy with two-way shape memory effect can effectively inhibit the growth of wire icing by changing the electric field strength of the surface on the wire.It is a non-interventional anti-icing method for transmission lines,and proves patently feasible.Further research is needed on the material ratio,preparation method,and optimal size of the two-way shape memory alloy.关键词
双程形状记忆效应/电场强度/非人工干预式/防冰Key words
Two-way shape memory effect/eletric field intensity/no manual intervention/anti-icing分类
信息技术与安全科学引用本文复制引用
曾伟,蒋兴良,杨国林,潘碧宸,张志劲..基于记忆合金双程形状记忆效应的导线雾凇防冰方法及现场试验[J].电工技术学报,2024,39(7):2174-2183,10.基金项目
国家自然科学基金面上项目(52077018)和电网输变电设备防灾减灾国家重点实验室项目(SGHNFZ00SHJCJ2100063)资助. （52077018）
