覆冰塔线体系爆破除冰后的动力响应分析

Dynamic Response Analysis of Iced Tower-Line System Due to Blasting Deicing

基于ABAQUS有限元软件,对220kV单回输电线路覆冰塔线体系的脱冰响应进行了模拟.采用改变密度法模拟未脱落覆冰的惯性作用,而覆冰脱落则通过改变惯性加速度来实现;分析了线型、脱冰档位置、档内脱冰位置、脱冰率和导地线脱冰顺序等对塔线体系的动力学响应的影响.针对单根导地线脱冰、双分裂导线同时脱冰和分步脱冰给出安全的脱冰方案.结果表明,档距为300m时,单根导、地线单次脱冰应选用初始脱冰率小于20%和30%的端部脱冰方式;双分裂导线中部同时脱冰的初始脱冰率应不大于10%,端部同时脱冰不大于30%;同档内分步脱冰时需对已除冰的导线增加临时间隔棒,且脱冰率逐级降低,存在高程差的导线脱冰时需减小脱冰率.

Based on the finite software ABAQUS,the de-icing response of a icing 220 kV single circuit transmission tower-line system was simulated.The variable density method was used to simulate the inertial effect of ice without shedding,and the shedding of ice was realized by changing the inertial acceleration.The influence of line types,locations of de-icing spans,locations of de-icing sites,de-icing rates and de-icing orders of conductors and ground wires on dynamic effects of tower-line system were analyzed.The safe solutions of deicing were given for single ground wire and conductor,and the safe solutions of simultaneous deicing and step-by-step deicing were also given for double bundled conductors.The results show,when the span length is 300 meters,that terminal de-icing once method with initial de-icing rate less than 20%should be selected for single conductor,and with initial de-icing rate less than 30%for single ground wire,and for double bundled conductors,that the middle de-icing method with initial de-icing rate less than 10%and terminal de-icing method with initial de-icing rate less than 30%should be selected,and when the step-by-step de-icing method is used in the same span,temporary spacers are needed for the de-iced conductors,and the de-icing rate is needed to reduce stepwise,and the de-icing rate is needed to reduce when conductors have different heights.