四种简单接地体的冲击接地阻抗分析  

Analysis of Transient Grounding Resistance of Four Simple Earth-Termination Systems

作　　者：陈加清[1] 周璧华[1] 贺宏兵[1] 赵春光[2] 

机构地区：[1]南京解放军理工大学工程兵工程学院,南京210007 [2]南京电子工程研究所,南京210007

出　　处：《高电压技术》2005年第2期1-3,共3页High Voltage Engineering

基　　金：国家自然科学基金资助重点项目(50237040);国家自然科学基金资助面上项目(60471013)

摘　　要：为研究接地装置的脉冲泄流效果,采用时域有限差分法对4种简单接地体在2种脉冲电流泄流下的接地 阻抗进行了数值分析,得出了相应的冲击接地阻抗时域特性。计算结果表明:在水平接地体上附加垂直接地体可 降低接地体的冲击接地阻抗,在垂直接地体间距大于2倍垂直接地体长度下,冲击接地阻抗随垂直接地体根数增 加而减小;接地体的冲击接地阻抗有一动态变化过程,需经一段时间的波动才趋于稳定;注入脉冲电流上升时间越 短,宽度越窄,覆盖的频段越宽,则冲击接地阻抗所达到的最大值越高,达到稳定值的时间越长。The impulsive discharging efficiency of four kinds of simple earth-termination systems is studied. The transient grounding resistance (TGR) of the earth-termination systems with two different impulse current is calculated using FDTD method. The corresponding waveforms of TGR in time-domain under different conditions are illustrated. The following results can be obtained: adding vertical earth electrodes to the horizontal ones can reduce the TGR and the value of TGR decreases with the increasing number of vertical earth electrodes when the space between the vertical earth electrodes is greater than twice of its length; there is a dynamic process for the transformation of TGR and it needs some time to become constant; the impulse current's rise time is shorter, its width is narrower and the frequency range is wider, the maximum value of the TGR is higher and the time when TGR become constant is longer.

关 键 词：接地 冲击接地阻抗 时域有限差分方法 

分 类 号：TM862[电气工程—高电压与绝缘技术]