【作者】 高长征；

【导师】 李琳；

【作者基本信息】 华北电力大学（河北） ， 电工理论与新技术， 2004， 硕士

【摘要】 本文结合博士点基金项目“变电站保护小室屏蔽效能的研究”(项目编号:20020079003)和河北省电力勘测设计研究院项目“国华定州发电厂500kV变电站电磁干扰问题研究”通过应用矩量法和时域有限差分法对钢筋网和钢筋混凝土的屏蔽效能进行了研究。针对在一般情况下钢筋混凝土的屏蔽作用主要取决于其中的钢筋网结构的特点使用基于矩量法的电磁场计算软件NEC计算分析了钢筋网网格尺寸、钢筋直径、入射波频率等因素对钢筋网屏蔽效能的影响,并对实际钢筋网屏蔽体的屏蔽效能进行了试验测量。另外,利用时域有限差分法计算分析了钢筋混凝土对电磁脉冲的屏蔽特点。根据电磁屏蔽的基本原理和计算公式,计算分析了现有变电站继电器保护小间设计方案的可行性,针对现行相对保守的设计方案提出了一定的改进建议并探求了采用钢筋混凝土作为保护小间屏蔽材料的可行性。更多还原

【Abstract】 Supported by the Research Fund for Doctor Program of High Education under grant No. 20020079003, and Hebei province electric power reconnaissance design institute, the shielding effectiveness (SE) of the reinforcing wire mesh and reinforced-concrete is studied by the using of moment method (MoM) and the finite difference time domain (FDTD) method. Because the SE is determined mainly by the reinforcing wire mesh in the structure of reinforced-concrete, NEC as a kind of electromagnetic field computation software based on MoM is used to analyse the effect on the SE of the grid size, wire radius and the frequency of incident wave. The SE of a model built with reinforcing wire mesh is test, too. Furthermore, the SE of reinforced-concrete for the transient electromagnetic field is studied by the FDTD method According to the basic theory of electromagnetic field shielding and formulas, the feasibility of the design of relay-cell in substation is discussed. Some advice is brought forward aiming at the conservative project and the feasibility of the reinforced-concrete used as shielding material in the structure of relay-cell is studied too.更多还原