220 kV新型双回路倒“Y”串输电塔电气及结构特性研究
|
摘要
山区输电线路杆塔排位时,垂直档距/水平档距(K_v)值是杆塔选择的重要限制因素之一。山区线路设计时,经常出现水平档距和垂直档距均不大,K_v值很小的情况,只能升高塔高、采用K_v值更小的塔型或者采取耐张塔开断等措施,这几种方式均会导致铁塔工程量增加,为解决此问题,设计了一种新型的倒"Y"串铁塔,用于K_v较小的地区。在大风、覆冰、断线等工况下对绝缘子串受力进行了分析,并对绝缘子金具串提出了合理的设计方案;建立了有限元模型,获得了自振特性并与常规塔做了对比;基于时域法对风振系数的分布特点进行了研究,提出了倒"Y"串塔塔身和横担各部位的风振系数建议取值;最后对倒"Y"串塔的经济性进行了对比分析。通过研究,揭示了倒"Y"串塔电气和结构的特性,结果可作为输电铁塔设计的参考。
To determine the pole and tower position for transmission line in mountainous areas,weight span/wind span( K_v ) is one of the important limiting factors of pole and tower. While designing transmission line in mountainous areas,there are often cases where the weight span and wind span are not large enough,and the K_v value is small,which can be solved raising tower height,adopting a tower with a smaller K_v value,or adopting a tension support as breaking measure.The three methods above will increase the engineering quantity,and a new-type inverted"Y"string transmission tower is introduced to solve this problem. It can be used in the areas with small K_v . In the case of strong wind,ice coating,broken wire and other working conditions,the stress of the insulator is analyzed,and reasonable design of fitting strings is proposed. The finite element model is established,and the natural vibration coefficients are obtained and compared with that of conventional towers. Based on the time domain method,the distribution characteristics of wind vibration coefficients are studied,and the recommended values of the wind vibration coefficients for tower bodies and cross arms of inverted"Y"tower are put forward. Finally,the comparative analysis of the economic performance of the inverted "Y"string tower is carried out. Through the research,the electrical and structural characteristics of the inverted "Y"towers are revealed,and the results can be used as a reference for the design of transmission towers.
To determine the pole and tower position for transmission line in mountainous areas,weight span/wind span( K_v ) is one of the important limiting factors of pole and tower. While designing transmission line in mountainous areas,there are often cases where the weight span and wind span are not large enough,and the K_v value is small,which can be solved raising tower height,adopting a tower with a smaller K_v value,or adopting a tension support as breaking measure.The three methods above will increase the engineering quantity,and a new-type inverted"Y"string transmission tower is introduced to solve this problem. It can be used in the areas with small K_v . In the case of strong wind,ice coating,broken wire and other working conditions,the stress of the insulator is analyzed,and reasonable design of fitting strings is proposed. The finite element model is established,and the natural vibration coefficients are obtained and compared with that of conventional towers. Based on the time domain method,the distribution characteristics of wind vibration coefficients are studied,and the recommended values of the wind vibration coefficients for tower bodies and cross arms of inverted"Y"tower are put forward. Finally,the comparative analysis of the economic performance of the inverted "Y"string tower is carried out. Through the research,the electrical and structural characteristics of the inverted "Y"towers are revealed,and the results can be used as a reference for the design of transmission towers.
引文
[1]110 kV~750 kV架空输电线路设计规范:GB 50545—2010[S].
[2]建筑结构荷载规范:GB 50009—2012[S].
[3]高耸结构设计规范:GB 50135—2006[S].
[4]架空送电线路杆塔结构设计技术规定:DL/T 5154—2012[S].
[5]张相庭.结构风压和风振计算[M].上海:同济大学出版社,1985.
[6]潘峰,高志林,王轶文,等. 360°风作用下线条风荷载分配系数特性[J].中国电力,2014,47(10):64-70.
[7]陈成,潘峰,王灿灿,等.“D”字型复合材料塔头输电塔结构特性研究[J].中国电力,2015,48(3):99-102.
[2]建筑结构荷载规范:GB 50009—2012[S].
[3]高耸结构设计规范:GB 50135—2006[S].
[4]架空送电线路杆塔结构设计技术规定:DL/T 5154—2012[S].
[5]张相庭.结构风压和风振计算[M].上海:同济大学出版社,1985.
[6]潘峰,高志林,王轶文,等. 360°风作用下线条风荷载分配系数特性[J].中国电力,2014,47(10):64-70.
[7]陈成,潘峰,王灿灿,等.“D”字型复合材料塔头输电塔结构特性研究[J].中国电力,2015,48(3):99-102.