重冰区特高压直流线路大截面多分裂导线选型研究

Study on Type Selection of Large Section and Multiple Bundled Conductors for UHVDC Transmission Line in Heavy Icing Area

选择特高压直流输电线路工程的典型重冰区段为边界条件,并根据系统规划要求,开展大截面导线的电气性能、机械特性和全寿命周期经济性的比较分析。研究表明,大截面导线均能满足机械特性的校核要求,但随着冰区量级增大,年费用最优的推荐导线总截面呈减少趋势。损耗小时数越低,减少分裂和减小截面的导线方案年费用优势越明显。

Taking the typical heavy icing section of UHVDC transmission line as boundary conditions and according to the re- quirements of system planning, the electrical performance, mechanical characteristic and life cycle economy of large section conductors are compared and analyzed. Research shows that large section conductors can meet the requirements of mechanical characteristics. And the annual cost of total cross section of the optimal recommended conductor shows a decreasing trend with the increase of ice. If the loss hours are lower, the advantage of annual cost of conductor plan with lowering the number of bundled conductor and reducing cross section is more obvious.