±800kV特高压直流线路跳线上绕耐张塔研究

摘要

At present, ±800 kV UHVDC tension towers in China all adopt the down jumper, that is, the bipolar lines are connected with the jumper hanging under the cross-arm in this situation.The down jumper in mountain area may let its height become the crucial factor for the height of tension tower, which leads to the raise of the height of tension tower and even cause the timber cutting and excavation of ground to be inevitable.Considering the tower structure, jumper string type, jumper type, air gap,critical corona field of ground wire and other factors, a new design of upper jumper is proposed for ±800 kV UHVDC tension tower.With its economic and social benefits, the upper jumper can provide a reference for the design of the following ±800 kV UHVDC tension towers.%目前中国±800 kV直流线路耐张塔均采用下引跳线型式,即两极导线通过挂在横担下的跳线进行接续.在山区下引跳线高度成为耐张塔高度的决定性因素,通常使得耐张塔呼高设计较高,甚至可能导致砍伐树木及对地开方.综合考虑塔型结构、跳线串型、跳线型式、空气间隙及地线起晕场强等因素,研究±800 kV特高压直流线路上绕耐张塔,并对其经济效益和社会效益进行分析,达到保护环境及节能减排的目的,为后续±800 kV特高压直流线路的耐张塔设计提供参考.