摘要
不同接地材料因其电磁参数的不同使得接地体的工频与冲击散流特性有区别。针对石墨、锰铜和钢三种接地材料进行仿真建模计算,建立了输电线路杆塔接地网常用的方框带射线型接地网模型,分别对比分析了三种接地材料在不同频率电流、不同土壤电阻率条件下的冲击散流特性,阐述了接地体散流特性对接地阻抗的影响。通过对比分析可知:在高频电流、高土壤电阻率条件下,柔性石墨接地体在远端的散流能力要优于钢接地体,接地阻抗更小。
Different grounding materials have different current dispersing characteristics of power frequency and impulse grounding because of different material parameters. Simulation？modeling calculation of graphite, copper and steel grounding materials are conducted, the box with extension lines-shaped grounding grid model which is common in transmission tower grounding grid is established. Then comparison and analysis of three grounding materials are carried out with different frequencies and different soil conditions. At last, the influence of grounding material current dispersing characteristic on grounding impedance are proposed. By comparing the results of data analysis, it can be found that under the condition of high frequency current and high soil resistivity, the impulse current dispersing characteristic of flexible graphite grounding material is better than that of steel grounding material at the end and the grounding impedance is also smaller.
出处
《电瓷避雷器》
CAS
北大核心
2017年第3期66-70,76,共6页
Insulators and Surge Arresters
基金
南网科技支撑项目(编号:K-GD2014-0867)
关键词
柔性石墨接地体
金属接地体
冲击散流特性
接地阻抗
flexible graphite grounding material
metal grounding material
impulse current dispersing characteristic
grounding impedance
