【摘要】 针对绝缘子在输电塔线体系动力分析中的作用问题采用在计算中变化绝缘子长度的方法来研究.建立有无绝缘子的输电线路有限元模型,分析有无绝缘子情况下线路动力特性的区别,采用导线脱冰分析绝缘子在顺线向响应中的作用,通过地震响应分析绝缘子对顺线向和横线向响应的影响.研究表明,绝缘子的摆动对纵向不平衡张力有明显的缓冲作用,长度越长缓冲作用越明显;地震分析中绝缘子对顺线方向响应有一定的缓冲作用,对横线方向没有缓冲作用;采用无绝缘子的塔线体系模型会给动力响应带来一定的误差.更多还原

【Abstract】 A methodology to change the lengths of insulators in the dynamic analysis was employed to investigate the function of the insulators.The finite element models of transmission line with and without insulators were built.The difference of vibration characteristics between the models with and without insulator was analyzed.The function of insulators on along-line responses of transmission line system was investigated using ice shedding analysis and the function of insulator on along-line and cross-line responses was investigated using seismic analysis.Results show that the swing of the insulators has significant effect on the reduction of unbalanced longitudinal forces induced by ice-shedding impact.And if the length of the insulators is longer,the effect of reduction will be better.In seismic analysis,the insulator has significant effect to reduce the responses in the along-line direction and has insignificant effect on the responses in the cross-line direction.The discrepancy will be introduced in the dynamic analysis of transmission line system if a calculating model without insulators is used.更多还原