架空地线的损耗特性及节能技术

随着电网规模的扩大、输电线路长度的增加,架空地线电能损耗问题日益突出.采用现场测量和仿真计算方法对架空地线电能损耗特性进行研究,得到110 kV～500 kV典型单、双回线路电能损耗定量数据及感应电流、电能损耗特性规律.在此基础上提出架空地线单点接地,地线分段、换位及导地线配合换位等多种节能接地措施,并在广东电网开展节能工程应用.分别在广东电网、南方电网实施架空地线节能工程的投资成本和经济效益表明,架空地线节能技术可大幅降低架空输电线路运行损耗,具有巨大的经济、社会效益,对于实施电网节能降耗、推进绿色电网建设具有重要意义.

Analysis on Power Loss Characteristics and Efficiency of Energy-Saving Technologies of Overhead Grounding Wires

With scale expanding of power grids and length increasing of transmission lines,the power loss of overhead ground wires has become an increasingly prominent problem.Therefore,the power loss characteristics of ground wires through field measurement and computer simulation,and the quantitative data and laws of induced current of 110～500 kV typical single,double circuit transmission line were studied,and a variety of energy-saving measures for overhead ground wire,such as single point grounding,segmentation,transposition,coordinate transposition with overhead conductors and grounding wires,etc.,were proposed,which have been applied to Guangdong power grid.It is shown that the energy-saving technologies can make overhead ground wires lossless operation and achieve enormous economic and social benefits basically.In addition,investment costs and economic benefits of energy-saving projects in Guangdong Power Grid and China Southern Power Grid were analyzed,which is of great significance to green power grid construction.