绝缘子在输电塔线体系动力计算中的作用分析
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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.
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.
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.
引文
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[3]LI Hong-nan,WANG Qian-xin,SINGH M P.Seismicresponse analysis method for coupled system of trans-mission lines and towers,Part II:In plane[J].地震工程与工程振动,1996,16(4):37-45.LI Hong-nan,WANG Qian-xin,SINGH M P.Seismicresponse analysis method for coupled system of trans-mission lines and towers,Part II:In plane[J].Earth-quake Engineering and Engineering Vibration,1996,16(4):37-45.
[4]郭勇,孙炳楠,叶尹.大跨越输电塔线体系风振响应的时域分析[J].土木工程学报,2006,39(12):12-17.GUO Yong,SUN Bing-nan,YE Yin.Ti me-domain a-nalysis on wind-induced dynamic response of long spanpower transmission line systems[J].China Civil Engi-neering Journal,2006,39(12):12-17.
[5]郭勇,孙炳楠,叶尹,等.大跨越输电塔线体系风振响应频域分析及风振控制[J].空气动力学学报,2009,27(3):288-295.GUO Yong,SUN Bing-nan,YE Yin,et al.Frequency-domain analysis on wind-induced dynamic response andvibration control of long span transmission line system[J].Acta Aerodynamica Sinica,2009,27(3):288-295.
[6]沈国辉,何运祥,孙炳楠,等.绝缘子断裂对大跨越输电塔的动力效应[J].浙江大学学报:工学版,2008,42(11):1990-1995.SHEN Guo-hui,HE Yun-xiang,SUN Bing-nan,et al.Dynamic effect on long-span transmission line systemdue toinsulator rupture[J].Journal of Zhejiang Univer-sity:Engineering Science,2008,42(11):1990-1995.
[7]沈国辉,默增禄,孙炳楠,等.突然断线对输电塔线体系的冲击作用研究,振动与冲击,2009,28(12):4-8.SHEN Guo-hui,MO Zeng-lu,SUN Bing-nan,et al.Research of i mpact effect on transmission line systemdue to sudden breakage of conductor[J].Journal of Vi-bration and Shock,2009,28(12):4-8.
[8]BROCKENBROUGH R L,MERRITT F S.Structuralsteel designer s handbook[M].3rd ed.New York:McGraw-Hill Inc,1999:546-547.
[9]FEKR M R,MCCLURE G.Numerical modeling of thedynamic response of ice-shedding on electrical transmis-sion lines[J].At mosphere Research,1998,46,(1/2):1-11.
[10]胡毅.电网大面积冰灾分析及对策探讨[J].高电压技术,2008,34(2):215-219.HU Yi.Analysis and countermeasures discussion forlarge area icing accident on power grid[J].High Volt-age Engineering,2008,34(2):215-219.
[11]金晓华.对覆冰区输电线杆塔加固和设计标准修订的建议[J].南方电网技术,2008,2(2):44-48.JIN Xiao-hua.Suggestions to reinforce transmissionline towers in ice area and revise the design standardcriterion[J].Southern power systemtechnology,2008,2(2):44-48.
[12]GB50011-2001.建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GB50011-2001.Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2001.
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