摘要
为研究超高压输电线路穿越复杂地势的工频电场,采用有限元法,根据悬链线方程求杆塔等高的输电线弧垂,构造不同地势的数学模型,建立500k V超高压交流输电线的计算模型,进行电场计算分析。500k V交流输电线下电场可近似垂直于地面,同相序双回路输电线的工频电场关于输电线路中心轴对称,随着距中心距离增加而减小。同一位置的电场在不同地势情况下不同,线路中心正下方距地1.5m处的电场在水平地面时最小,凹形地面时最大。此种考虑地势的计算模型大大提高了工频电场计算的准确性,对非平原地区输电线的电场研究具有一定的借鉴意义。
To precise research of the power frequency electric field under the condition of complex landscapes, based on the finite element analysis method, got the wire＇s lowest sag part by catenaries＇ formula, a mathematical model of landscape and the calculation model of 500 k V AC EHV transmission line were made respectively to analysis the distribution of electric field. The electric filed of EHV Transmission Lines approximately perpendicular to the ground and symmetric about the center of the transmission line when EHV Transmission Lines are double circuit and the same phase sequence, the electric filed decreases with the distance from the center increasing. The electric field in the same position is different under different landscape, the electric field in 1.5 meters from the ground is least when the ground is flat. Conversely, it＇s largest under concave ground. The calculation model considering complex landscape greatly improves the accuracy of the power frequency electric field and has a certain reference value for the electric study of non-plain transmission line.
出处
《电气技术》
2015年第9期7-10,15,共5页
Electrical Engineering
基金
国网福建省电力有限公司科技项目(521309135004)
关键词
超高压输电线路
工频电场
模型
有限元法
复杂地势
EHV transmission line
power frequency electric field
model
FEM
complex landscape
