考虑故障短路电流分布的纳米碳纤维材料接地特性

Grounding characteristics of nano-carbon fiber grounding material considering short circuit current distribution

为分析非金属材料接地网的电气性能和热稳定性能,提出一种纳米碳纤维接地材料半径的等效方法及地网性能评估方法。首先建立纳米碳纤维接地网评估流程,然后从导体截面积选择与等效、入地短路电流的计算及其对接地参数计算的影响、地电位升高幅值、地电位分布这4个方面分析纳米碳纤维接地网的安全评估方法,并从接触电位差、跨步电位差、地电位升高幅值等角度对比分析纳米碳纤维接地材料与传统金属接地材料的散流性能。研究结果表明:纳米碳纤维材料应用于变电站地网是可行的,并可为非金属材料大型接地网性能评估提供参考。

Aiming at the difference of electrical specification and heat stability between nonmetal and metal grounding materials,an appraisal procedure was proposed for the performance of nano-carbon fiber grounding grid.A detailed evaluation process was presented for the security evaluation of nano-carbon fiber grounding grid,Considering equivalent sectional area of conductor,short-circuit current and its influence,grounding parameters,increase and distribution of grounding potential and so on were calculated.The diffuser performance of nano-carbon fiber and common metal grounding grid was analyzed by contact potential,step potential difference and increase of grounding potential.The results show that nano-carbon fiber can be applied in substation grounding grid and the method can provide reference to assess the safety of nonmetal grounding materials.