摘要
导线最小对地距离的取值是特高压输电线路设计过程中需要考虑的关键因素之一。通过总结国外特高压输电线路的相关研究成果,结合我国超高压输电线路的设计经验,提出了把"最大地面电场强度限值"作为我国交流特高压线路导线最小对地距离的选取原则。基于逐步镜像法建立了特高压架空线下空间电场的数学模型,并按照不同区域地面电场控制指标的要求,通过计算确定了1000 kV级交流特高压单回和同塔双回输电线路导线在相应区域下的最小对地距离。研究了线路运行电压、相间距离、分裂导线结构、导体布置形式和双回路相序布置方式等因素对导线最小对地距离取值的影响规律。
The minimum ground clearance of bundle conductors for 1 000 kV AC UHV transmission lines is one of the key factors in UHV transmission line design. Based on the foreign research results and combined with the domestic design experience of UHV transmission lines,it is suggested that the maximum threshold value of ground electric field strength is taken as the principle for selecting the minimum bundle conductor ground clearance of AC UHV transmission lines. The mathematical model of the power frequency electric field under UHV overhead line is established based on the successive images method. The minimum bundle conductor ground clearances of 1000 kV AC UHV single- circuit and double- circuit lines on same tower are calculated according to the control indices of ground electric field for different regions. The influences of operating voltage, phase spacing,bundle conductor structure,phase conductor configuration,phase order arrangement on the minimum ground clearance are studied.
出处
《电力自动化设备》
EI
CSCD
北大核心
2008年第1期17-22,共6页
Electric Power Automation Equipment
关键词
特高压输电线路
工频电场
对地距离
UHV transmission line
power frequency electric field
ground clearance
