CAJ | 학술논문

变电站作为电力系统中一次设备和二次设备最集中的场所，其电磁环境受到了越来越多的关注，变电站工频电场评估日益重要。对变电站元件进行三维建模，以导线、绝缘子和均压环等元件为研究对象，对其几何形状进行合理简化，以降低剖分难度，减少剖分数量，提高计算速度，并采用有限元法对1.5 m高度的路径进行电场计算。以一个500 kV变电站间隔作为算例，将简化模型与实际模型的电场数值进行对比，结果表明距离模型边缘8m 之内时，相对误差在-7%～11%；距离模型边缘大于8 m时，相对误差在-3%～5%之间；大于15 m时，误差小于5 V/m。简化模型的计算量为原模型的1/4，简化效果较好。
변전참작위전력계통중일차설비화이차설비최집중적장소，기전자배경수도료월래월다적관주，변전참공빈전장평고일익중요。대변전참원건진행삼유건모，이도선、절연자화균압배등원건위연구대상，대기궤하형상진행합리간화，이강저부분난도，감소부분수량，제고계산속도，병채용유한원법대1.5 m고도적로경진행전장계산。이일개500 kV변전참간격작위산례，장간화모형여실제모형적전장수치진행대비，결과표명거리모형변연8m 지내시，상대오차재-7%～11%；거리모형변연대우8 m시，상대오차재-3%～5%지간；대우15 m시，오차소우5 V/m。간화모형적계산량위원모형적1/4，간화효과교호。
As the substation is the place with the most concentrated primary and secondary equipment in the power system, the electromagnetic environment has been of more interest. Therefore the calculation and assessment on the power frequency electromagnetic field in high voltage substation become increasingly important. In this paper, the 3 D models of the substation element were built. The equipment such as conductor, insulator and grading ring which were regarded as research objects was simplified in geometry to reduce the difficulty of subdivision and the number of subdivision, and also to increase the computing speed. In the paper, finite element method was used to calculate electric field intensity at 1.5 m horizontal plane. And an example of a 500 kV substation interlayer was used to compare the electric field intensity of the simplified model with that of the original model. The results show that the relative error is between 7%-11% within 8 m from the edge of the model and 3%-5% beyond 8 m. The error is less than 5 V/m beyond 15 m from the edge of the model. The computation complexity of the simplified model is a quarter of the original model, so the effect of the simplification is satisfactory.