为有效解决城区土地紧缺和美化环境的问题,采用电力电缆取代架空线路已成为城区电网建设的趋势。以某110kV同塔双回线路连接塔电缆支架为研究对象.建立电缆及其支架的仿真模型。根据有限元法对模型进行网格剖分及处理,计算了支架材料、电缆电流、电缆相序排列方式、支架材料相对磁导率以及电缆相间距离对支架能量损耗的影响。计算结果表明:使用不锈钢材料可以有效降低电缆支架中的损耗:电缆电流及支架材料相对磁导率与支架损耗呈正相关关系;电缆相序排列方式对支架损耗影响较小,同相序时损耗最大,逆相序时最小;随着电缆相间距离的不断增大.支架损耗呈先上升后下降的趋势,当相间距离为25cm时,之间损耗达到最大值.分别为356.01W/m0和206.31W/m3。
In order to solve the problem of urban land shortage and beautify the environment effectively, power cables is using widely instead of overhead lines in urban power grid construction. Cable bracket in junction tower of 110 kV double circuit lines is studied, establish the simulation model of the cable and bracket, the finite element method is used to the model grid dissection and computing process, the effect of bracket material, cable current, phase sequence arrangement, relative permeability of bracket material and distance between each phase for bracket power loss is studied. The calculation results show that: the use of stainless steel materials can effectively reduce the loss of the cable bracket; the relation between cable current, relative permeability of bracket material with bracket losses is positive correlation; influence of arrangement of cables phase on bracket loss is small, the same phase sequence yield maximum loss, minimum when inverse phase sequence; with the increasing distance between phases, bracket loss increased first and then decreased, when the inter phase distance is 25 cm, the loss reached the maximum, respectively 356.01 W/m3 and 206.31 W/m3.