智能循环电流融冰方法及其临界融冰电流研究  

Intelligent Cycled Current Ice Melting Method and Its Critical Ice-Melting Current Study

作　　者：舒立春[1] 罗保松[1] 蒋兴良[1] 胡琴[1] 李特[1] 兰强[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电工技术学报》2012年第10期26-34,共9页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)(2009CB724502;2009CB724501);创新研究群体科学基金(51021005)资助项目

摘　　要：提出了对分裂导线子导线进行分组并将输电线路总负荷电流循环通流至各子导线组以实现输电线路融冰的智能循环电流融冰方法。通过对雨凇覆冰过程中临界融冰时导线及其表面冰层的热平衡分析,建立了智能循环电流融冰方法的临界融冰电流计算模型,在人工气候室进行了实验验证,建立了有限元仿真模型,三者的结果吻合,分析了临界融冰电流的影响因素,计算了近年来严重覆冰灾害气象条件下的临界融冰电流并与经济电流密度对应的电流进行比较。结果表明:在同等条件下,智能循环电流融冰方法所需的临界融冰电流小于直流短路融冰的临界电流;临界融冰电流与覆冰厚度、环境温度和风速有关,在环境参数一定时覆冰厚度对临界融冰电流的影响趋势不明显;同一覆冰厚度下,环境温度越低临界融冰电流越大,风速越大临界融冰电流越大,且随着环境温度的降低和风速的增大临界融冰电流增长趋于缓慢;输电线路经济电流密度对应的电流高于严重覆冰灾害气象条件下的临界融冰电流并有足够的裕度,因此智能循环电流融冰方法在融冰电流的选择上是可行的。In this paper,intelligent cycled current ice melting method which groups the bundle conductor sub-conductors and allows the total transmission line load current to flow through each sub-conductor group to achieve the ice melting of the transmission line is proposed.Then based on the analysis of heat balance of the ice and conductor surface under critical ice melting condition in the glaze icing process,a method to calculate the critical current of intelligent cycled current ice melting method is established.The model is tested by experiment in artificial climate chamber.Finite element simulation model is also created.The results of them are basically consistent with each other.Then the factors affecting the critical ice-melting current are analyzed,and the critical ice-melting current under weather conditions of serious icing disaster in recent years is calculated and compared with the current corresponding to economic current density.The results show that： under the same conditions,the critical icing melting current for intelligent cycled current ice melting method is lower than the critical ice-melting current for DC Short-circuit method.Critical icing melting current is related to ambient temperature,wind speed and ice thickness.Under the same environmental parameters,the effect of ice thickness on critical icing melting current is not obvious,under the same ice thickness,critical icing melting current shows gradually saturated increasing trends with lowering ambient temperature or increasing wind speed.The current corresponding to economic current density is higher than the critical ice-melting current under weather conditions of serious icing disaster and retains sufficient margin.Therefore,intelligent cycled current in the view of choosing ice-melting current is feasible.

关 键 词：智能循环电流融冰方法 雨凇覆冰 临界融冰电流 影响因素 

分 类 号：TM852[电气工程—高电压与绝缘技术]