考虑弧垂情况下交流输电线路的地面电场分布
Electric Field Distribution of AC Transmission Lines Considering Vertical Sag
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摘要:
为研究交流输电线路下方的实际地面电场分布，分别分析了导线对地高度对导线电荷量和地面电场的影响。分析结果表明：导线对地高度对电荷量影响不大；在电荷量一定的前提下，导线对地高度对地面电场影响很大。因此，在假设导线对地高度不影响导线电荷的基础上，考虑导线的弧垂形状，以微分矢量叠加的方式求解线路下方的实际地面电场分布并以交流特高压为例进行了计算与验证。分析结果表明：线路下方的高场强范围只在导线档中附近存在，电场强度在远离档中的区域迅速减小，与以对地最小对地高度计算得到的地面电场分布差异很大。研究成果对房屋拆迁的判断有重要的指导意义。 Abstract:In order to study the actual ground electric field distribution under the AC transmission line, the influence of the height of the conductor to the ground on the electric charge and the electric field was analyzed. The results show that: The influence of the height of the conductor to the ground has little effect on the electric charge; The influence of the height of the conductor to the ground electric field is very large under the condition that the charge quantity is unchanged. Therefore, under the assumption that the height has no influence on the charge of the conductor, considering the arc shape of the conductor, the actual electric field under AC transmission line was solved by the differential vector superposition method and the electric field distribution under UHV AC transmission line was taken an example for the calculation and verification. The analysis results show that the high field range below the line only exists near the middle span and the electric field intensity decreases rapidly with the distance away from the midspan which is very different with the ground electric field distribution calculated by the minimum height. The research results have important guiding significance for the judgment of the house demolition.
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