【摘要】 为了研究覆冰导线在直流融冰过程下覆冰融化脱落问题，以LGJ-400/50输电导线为研究对象，应用ANSYS软件中LS-DYNA PrepPost模块采用非线性结构动力学模型，建立实际运行过程分裂导线体系有限元模型。在有限元分析过程中，考虑实际导线情况，采用SOLID45实体单元对导线进行分层建模，计算时采用生死单元法杀死覆冰单元，更加准确模拟融冰时的实际情况。目前对分裂导线脱冰研究大多将分裂导线等效成单导线进行计算，在实际融冰操作过程中，分裂导线体系存在不同步脱冰现象，需对不同子导线脱冰时的情况进行分析。结果表明，直流融冰下脱冰导线的跳跃高度比正常脱冰的跳跃高度小，导线脱冰跳跃高度及导线张力随融冰电流增加而减小；四分裂导线-间隔棒体系子导线不同步脱冰时，对角线两根子导线脱冰及下方两根子导线脱冰工况下，分裂导线体系较为稳定，其它工况子导线不同步脱冰时，四分裂导线-间隔棒体系存在横向摆幅，进而产生扭转风险，会造成导线磨损和断股事故发生。更多还原

【Abstract】 Here, to study the problem of ice-melting and falling off of iced conductors in DC ice-melting process, LGJ-400/50 transmission line was taken as the study object, and the software ANSYS LS-DYNA PrepPost and a non-linear structural dynamic model were applied to establish the finite element(FE) model of bundled conductor system in actual operation process. In process of FE analysis, considering conductor actual situation, SOLID45 solid element was used to perform layered modeling for conductor, and the life and death element method was used to kill iced elements during calculation, and more accurately simulate actual situation during ice-melting. Currently, studying bundled conductor’s deicing mostly performed calculation under the condition of bundled conductor being equivalent to single conductor. In the actual operation process of ice-melting, there were asynchronous deicing phenomena in bundled conductor system, it was necessary to analyze deicing situations of different sub-conductors. The results showed that jumping height of deicing conductor under DC ice-melting is smaller than that of normal deicing conductor, jumping height of deicing conductor and conductor tension decrease with increase in ice-melting current; when sub-conductors of four-bundle conductor spacer system asynchronously deicing, under conditions of two sub-conductors of diagonal lines deicing and lower two sub-conductors deicing, bundle conductor system is more stable; when sub-conductors deicing asynchronously under other working conditions, four-bundle conductor spacer system has a lateral swing to generate torsion risk, and cause conductor wear and broken strand events.更多还原