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Compared with traditional galvanized grounding materials, copper-plated grounding materials have more advantages
1. Corrosion resistance: the corrosion resistance of the grounding body directly determines the service life of the substation grounding grid. The corrosion of the grounding body mainly includes surface corrosion and spot corrosion. Surface corrosion refers to average corrosion. This corrosion is related to the material of the grounding body and the corrosion performance of the soil, and the speed is relatively stable; The pitting corrosion mainly exists in the parts prone to electrochemical corrosion, such as joints. The rate of pitting corrosion is 4-60 times of the average corrosion rate, which is the main corrosion form threatening the safety of the grounding grid.
2、导电率：地网材料的导电率直接影响变电站地网的工频电阻和冲击电阻。按照国际退火铜标准（IACS）规则的导电率，标准铜的导电率为100%，标准钢仅为10.8%，铜的导电率约是钢的10倍。镀铜钢材料依据镀层厚度不同，导电率约为20%～40%，远好于钢质接地材料。在高频雷电流冲击时，由于导体的集肤效应更加分明，镀铜钢接地材料的高频导电特性比钢接地材料优势进一步扩展。
3、热稳定性：接地材料的截面积主要取决于它的热稳定性。表征材料热稳定性特征的材料的热稳定系数C。铜材的热稳定系数为210，钢材为70，而30%镀铜钢绞线约176。相同短路条件下，钢接地体所需的截面积为铜材的3倍，是30%镀铜钢绞线的2.5倍。
4、施工难易度：变电站接地设计中，钢接地网一般采用镀锌扁钢作为水高山网材料，镀锌角钢作为垂直地网材料；铜覆钢地网一般采用镀铜钢绞线作为水高山网材料，采用镀铜圆钢作为垂直接地极。镀锌扁钢受镀槽长度限制，每根长度一般不超越6m，变电站的水高山网长度通常在100m～300m左右，整个地网敷设时就会发生少量的搭接接头，而镀铜钢绞线每盘线的长度可以到达200m，可大大减小接头数量，不仅增加许多施工量，还可以提高系统牢靠性。作为垂直接地极镀铜圆钢接地棒比镀锌角钢更容易打入土壤深处，接地施工也更方便。
5、焊接牢靠性：镀锌扁钢的搭接主要靠电弧焊，接时由于焊点温度高，焊弧直接暴露在空气中，当空气侵入时，液态金属会发作激烈的氧化、氮化反响，还有少量金属蒸发，而且空气中的水分在电弧低温下分解出的氢原子可以溶入液态金属中，招致接头氢脆，塑性和韧度降低，甚至发生裂纹。另外，由于手工焊接时，焊点直接暴露在空气中，焊接后冷却很快，各种冶金反响难以到达均衡状态，焊缝中化学成分不平均，且熔池中气体、氧化物等来不及浮出，容易形成气孔、夹渣等缺陷，造成虚焊或许焊不透，影响接地体的导电性。同时，电弧焊的质量受焊接工人的技术影响也比较大，不稳定因素较多。
This article is from:http://www.newstar-china.com/
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