接地极电流分布的一种简化计算方法  

Simplified Method for Calculation of Current Distribution on Grounding Electrodes

作　　者：陈先禄[1] 王长运[1] 刘渝根[1] 袁涛[1] 

机构地区：[1]重庆大学电气工程学院高电压与电工新技术教育部重点实验室,重庆400030

出　　处：《重庆大学学报（自然科学版）》2006年第10期16-19,共4页Journal of Chongqing University

摘　　要：针对直流接地极和杆塔接地极上电流分布不均匀的问题,提出了计算电流分布的一种简化方法.根据电流场和静电场的等效性,将接地极等效为有限长的线电荷模型,并由力学平衡计算了模型上的电荷分布,由此得到入地电流沿接地极轴线的分布规律.结果表明,接地极端部电流密度是中间部位的数倍,倍数随着接地极长度的增加而增大,对于并联的垂直接地极,电流分布的不均匀度随着接地极根数的增加而增大,导体的利用率也随之降低.这是导致接地极的利用率低,部分部位过热或过早腐蚀等问题的原因.A new method is presented to calculate the non-uniform of current distribution on grounding electrode. Based on the equivalence of low frequency current field and static electric field, the electrode is simplified to he a line charge model with limited length. The charge distribution on the model is calculated by solving equilibrant equations, and the current distribution along the axis of electrode was got. The current density at the end of electrode can he several times of that in the middle, the non-uniformity get worse with the increasing of electrode length and numbers. This is what lead to several problems on grounding systems such as inefficiency, the partial overheat and the severe corrosion of electrode.

关 键 词：接地板 电流分布 电流场 

分 类 号：TM83[电气工程—高电压与绝缘技术]