中文摘要：

为推算特高压双回交流输电线路邻近建筑物时所需的安全距离，采用有限元软件（ANSYS）计算分析了1000kV同塔双回交流输电线路邻近不同高度房屋时其楼顶、阳台和室内的电场强度，并以此推算了满足4kV／m控制限值的双回线路对地最低高度以及房屋与线路的水平安全距离。研究结果表明：阳台处工频电场强度随楼层高度的增加而增大，且房屋对底层阳台工频电场的屏蔽效果明显；楼顶观测面上畸变电场强度随房屋高度的增加而增大，且远大于阳台和室内的工频电场强度；楼层较高时，线路对地最低高度的变化与楼层高度的变化基本一致，且房屋与线路的水平安全距离基本趋于不变。

英文摘要：

To obtain the safety distance between ultra-high voltage（UHV） double-circuit AC transmission lines and adjacent buildings, power-frequency electrical field strengths of the building roofs, balconies and interiors were analyzed by using ANSYS. Calculation of the electrical field strength was performed on buildings of different heights nearby a 1 000 kV double-circuit AC transmission line on same tower, and then the least conductor height above the ground and the horizontal safety distance that conformed to the control limit value of 4 kV/m were derived. Conclusions obtained from the calculation results are drawn as follows： the power frequency electrical field strength of balconies increases with the building height, and the building has a significant shielding effect against electric field of the lower balconies; the distorted electrical field strength of roofs increases with the building height, and it is much larger than those of the balconies and interiors; with the building height is increasing, the variation of the smallest conductor height above ground is in accord with that of the buildings height, while is the horizontal safety distance remains basically unchanged between the conductors and the buildings.