变电站三维电场计算简化模型及误差分析  

Analysis on Simplified Model and Error of Three-Dimensional Calculation for 3D Electric Field in Substation

作　　者：安然[1] 鲁海亮[1] 蓝磊[1] 岳云峰[2] 谭可立[2] 王建武[2] 周光远[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]广东省电力设计研究院,广东省广州市510600

出　　处：《电网技术》2014年第11期3242-3248,共7页Power System Technology

摘　　要：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 k V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8 m之内时,相对误差在?7%?11%;距离模型边缘大于8m时,相对误差在?3%?5%之间;大于15m时,误差小于5V/m。简化模型的计算量为原模型的1/4,简化效果较好。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 3D 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 1.5m horizontal plane.And an example of a 500kV 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 8m from the edge of the model and -3%-5% beyond 8 m.The error is less than 5V/m beyond 15m 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.

关 键 词：有限元法 电场计算 误差分析 500k V变电站 

分 类 号：TM74[电气工程—电力系统及自动化]