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电网技术  2014 

变电站三维电场计算简化模型及误差分析

DOI: 10.13335/j.1000-3673.pst.2014.11.046, PP. 3242-3248

Keywords: 有限元法,电场计算,误差分析,500,kV变电站

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Abstract:

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1.5m高度的路径进行电场计算。以一个500kV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。

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