电网技术Issue(8)：2304-2309,6.DOI:10.13335/j.1000-3673.pst.2014.08.045
分层土壤中接地装置冲击散流特性的有限元分析模型
Finite Element Model of Impulse Dispersing Characteristics of Grounding Equipment in Layered Soil
摘要
Abstract
The process of impulse current scattering into layered soil possesses obvious feature of nonlinear variation. Based on electromagnetic field theory a finite element model is established to analyze the impulse characteristics of grounding device in layered soil. In the analysis on the nonlinear process, both conduction current and displacement current are taken into account to reflect the physical process of impulse current scattering into layered soil accurately. To cope with the problem that the finite element computation is not easy to converge due to the sudden change of resistivity at the boundary surface between the grounding conductor and that between the interfaces of layered soil, a method, in which the smooth step function with continuous partial derivative is used for the transition, is adopted; to transform the infinitive scattering space into finite computational region, a geometric coordinate transform method for the soil with layered structure is proposed, thus the calculated amount is reduced while the computation accuracy can be ensured. Simulation results and experimental results are compared and analyzed, and it is shown that using the proposed model the non-linear variation due to non-uniform ionization of soil and the randomness of discharge channel in layered soil structure can be simulated well, thus the effectiveness of the proposed model is validated.关键词
接地装置/分层土壤/几何坐标变换/平滑函数/有限元模型Key words
grounding device/layered soil/geometric coordinate transform/smooth function/finite element model分类
信息技术与安全科学引用本文复制引用
朱时阳,袁涛,朱彬..分层土壤中接地装置冲击散流特性的有限元分析模型[J].电网技术,2014,(8):2304-2309,6.基金项目
国家自然科学基金项目(51107153)。Project Supported by National Natural Science Foundation of China (51107153) （51107153）
