一种基于FRP材料的新型输电杆塔研究

Research of a novel type electric power tower made in FRP

针对当前输电杆塔存在的诸多问题,提出了用FRP材料制作杆塔的思想。介绍了国内外FRP材料及其在电力建设中应用的情况,设计了适用于110kV输电线路的FRP材料杆塔。根据导线排列方式,该杆塔可分为上字型和门型杆塔两种。以上字型杆塔为例,设计了FRP杆塔的结构和尺寸,分析了该杆塔的机械力学性能,对可能出现的破坏形式进行了校验。采用场域分解的方法将三维无界场域分解成有界子区域,利用AnSoft软件,建立了常规杆塔和FRP杆塔三维仿真模型,分析了两种杆塔的对地1m处场强和导线表面最大场强。仿真结果表明FRP杆塔的导线表面最大场强要远小于对应钢管杆的值。对杆塔尺寸进行了多种改变,分析了相应情况下"上"字型FRP杆塔的机械性能和电气性能,得到了电杆最小截面宽度为37.6cm,最小壁厚为3.06cm,建议杆塔呼高为11m,下横担宽度为4m。

The electric power tower made of Fiber Reinforced Polymer （FRP） is researched in order to avoid many problems from current power tower. The present research status at home and abroad of FRP application used in power construction is introduced, and the FRP tower used in 110kV power transmission line is designed. According to the arrangement of conductors, FRP tower can be classified into two categories： inverted F type and [I type. Taking inverted F type tower as an example, the construction and dimension of FRP tower are designed, and the mechanical properties are analyzed to research the security intensity of possible failure modes. According to the the- ory of field decomposition, the unlimited three-dimensional field is divided into limited sub-fields, and the three-di- mensional simulation models of usual tower and FRP tower are constructed to analyze the field strength on lm-to- ground and the maximum field strength on the conductor surface. The result shows that the field strength of FRP is smaller than that of steel tower. Alternating the dimension of FPR tower, the mechanical properties and electric properties are analyzed, therefore, the minimum section width of tower is 37.6cm, the minimum pipe thickness is 3.06cm, and it suggested that the nominal height is llm, the width of bottom cross arm is 4m.