输电线路增容导线弧垂特性真型试验研究

摘要

With the diversification of requirements in transmission line construction and renovation projects, augmented capacity conductor will be applied to AC/DC transmission line project with multiple voltage levels.In existing transmission line design, the sag of transmission line are evaluated by empirical formula, which is verified merely in a 60 meters small span test in laboratory, and is quite different from the actual project.To understand the temperature rise and sag characteristics of typical conductors and provide basis for the selection of transmission line conductor, the first domestic 200 m large span transmission line on actual strain tower for full scale test is built in Kunming UHV engineering technology lab to study on the temperature rise and sag characteristics of four kinds of conductors, including one kind of ordinary aluminum clad steel conductor and three kinds of typical augmented capacity conductor: carbon-fiber aluminum conductor composite core (ACCC), aluminum clad invar core aluminum alloy wire, and aluminum clad steel core aluminum alloy wire.Results show that ACCC and aluminum clad invar core aluminum alloy wire have better arc sag characteristics, and there are obvious temperature transfer points.The temperature transfer point of ACCC is about 75 ℃, and the transfer point of aluminum clad invar core aluminum alloy wire is about 105 ℃.%随着输电线路新建和改造工程需求的多样化,增容导线将逐步应用于各电压等级的交直流输电线路工程.现有的输电线路设计通常采用经验公式来评估线路的弧垂,且仅在实验室开展过长60 m的小档距试验验证,与工程实际相差较大.为充分掌握典型增容导线的温升-弧垂特性,为输电线路导线选型提供依据,在昆明特高压实验基地搭建了国内首个200 m大档距真型塔试验线路耐张段,对普通铝包钢芯铝绞线和3种具有代表性的增容导线(铝包钢芯耐热铝合金绞线、铝包殷钢芯耐热铝合金绞线、碳纤维复合芯软铝绞线)共4种导线进行了详细的温升-弧垂特性对比试验研究.研究表明,碳纤维复合芯软铝绞线和铝包殷钢芯耐热铝合金绞线具有较优的弧垂特性,均出现明显的温度迁移点,碳纤维复合芯软铝绞线迁移点温度在75 ℃左右,铝包殷钢芯耐热铝合金绞线迁移点温度在105 ℃左右.