750kV同塔四回输电工程中不同类型导线电晕损失的对比分析  

Comparative Analysis of Corona Loss in 750kV Multi-circuit Transmission Projects on the Same Tower with Different Types of Conductors

作　　者：宋晨铭 黄世龙[1] 刘云鹏[1] SONG Chen-ming;HUANG Shi-long;LIU Yun-peng(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defence,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学,河北省输变电设备安全防御重点实验室,保定071003

出　　处：《科学技术与工程》2022年第27期11975-11982,共8页Science Technology and Engineering

基　　金：国家自然科学基金(52007063);中央高校基本科研业务费(2020MS092)。

摘　　要：在750 kV架空输电线路设计时,导线型号的选择决定初期投资成本、电阻损耗和电晕损失,从而影响架空输电线路的经济效益。以沙尘暴多发的高海拔地区750 kV同塔四回输电线路为例,对比分析了两种典型导线的输电线路电晕损失及运行总成本。采用电晕损失等效原理计算导线型号为LGJ-400/50的输电线路在不同布置方式下电晕损失,通过电晕损失等效系数及海拔修正计算得到输电线路年平均电晕损失功率P_(avg),并结合不同天气对应的小时数计算得到线路全年电晕损失总量。与采用LGJ-500/45导线时的投资成本、电阻损耗、电晕损失及总成本进行了对比。研究表明:750 kV同塔四回输电线路最优布置方式为四层横担第Ⅱ相序布置,导线型号为LGJ-500/45输电线路单位公里年运行总成本为LGJ-400/50的75.8%,从经济性选型角度,推荐采用LGJ-500/45导线。During the design of 750 kV transmission lines,the selection of the type of conductor determines the corona loss,resistance loss and initial cost,thus further influencing the economic benefit of overhead transmission lines.Based on a project involving 750 kV four-circuit transmission lines on one tower in high-altitude area where sand and dust storms are commonplace,the corona loss and total operating cost of the transmission line of the two typical conductors were compared and analyzed.The corona loss of transmission line type LGJ-400/50 with different layout modes was calculated by the corona loss equivalence principle.The average annual corona loss power of transmission line P_(avg) was calculated by the equivalent coefficient of corona loss and altitude correction,and the total annual corona loss of transmission line was calculated according to the hours corresponding to different weather conditions.The investment cost,resistance loss,corona loss and total cost were compared with LGJ-500/45 conductor.It can be found that the total annual operation cost of transmission lines with the LGJ-500/45 conductors per kilometre accounts for 75.8%of that when using LGJ-400/50 conductors.From the perspective of economical conductor selection,it is recommended to use LGJ-500/45 conductors.

关 键 词：同塔四回 六层横担 四层横担 沙尘天气 电晕损失 总成本 

分 类 号：TM751[电气工程—电力系统及自动化]