建筑物对同塔双回路工频电场分布的影响

同塔双回输电线路占地走廊少,节省土地资源,且随着城市发展,电力需求增大,输电线路电磁环境问题越来越受到关注。为此采用模拟电荷法研究了同塔交流输电线路的工频电场强度分布及衰减规律。研究表明对工频场强,导线半径的影响较少且仅在中心线5m以内;相间距的影响稍大些,但也在5m内;导线高度的影响最大。比较理论计算和实测的工频电场强度证明了建筑物对工频电场的屏蔽效应。

Influence of Buildings on Electric Field Generated by HVAC Transmission Lines

The simulated charge method (SCM) is adopted to calculate the distribution of the power frequency electric field generated by the double-circuit HVAC transmission lines with different conductor configurations in the paper. The results indicate that the conductor radius and the distance of the phase-phase affect the maximum power frequency electric field intensity, and little affect the distribution and attenuation of the power frequency electric field intensity when the distance is far from 5m. The height of the conductor has main effect on the attenuation and distribution of the power frequency electric field intensity. In order to illustrate the effect of the buildings on the distribution of power frequency electric field, on-site measurements were carried out along two lines. The measured lines are perpendicular to the way of the double-circuit transmission lines, one of which is located in a smooth place and the other is located between two buildings. Comparisons between the calculated and measured power frequency electric field intensity indicate that the buildings have the shielding effect on the power frequency electric field.