不锈钢复合材料用于输电线路杆塔接地系统及其耐腐蚀性研究

Research of Stainless Steel Composite Material Applied to Grounding Device for Transmission Line Tower and Its Corrosion Resistance

为减少因接地网腐蚀损坏造成的电网事故,开发了不锈钢复合材料防腐蚀技术,设计了新型耐酸性土壤腐蚀接地装置。基于电化学法和失重法的腐蚀试验结果表明:在强酸性土壤中,铜的腐蚀速率(0.002 4 mm/a)远大于不锈钢复合材料的腐蚀速率(0.000 2 mm/a),且2者偶合时,铜的腐蚀速率将大大增加;同时开发的不锈钢复合材料接地体在中性、强碱性和盐渍土壤中也有较好的适用性。从实际应用情况中发现,不锈钢复合材料接地装置的耐腐蚀性远远优于镀锌钢及其他接地材料,且可推算其使用寿命>60 a,其全寿命周期成本约为热镀锌钢接地装置的38.1%,满足电网设备全寿命周期成本管理规定。

In order to reduce the grounding grid accidents caused by grounding device corrosion, we developed a corro- sion prevention technique using stainless steel composites and a type of acid-soil anticorrosive grounding device. Based on the tests using the electrochemical method and the weightlessness method, it is obtained that in strong acid soil, the corrosion rate （CR） of copper is 0.002 4 ram/a, which is far higher than that of the proposed composite material, 0.000 2 ram/a, and it will further increase when coupling the two kinds of materials together. The results are quite similar in neu- tral soil, strong basicity soil, and salt marsh soil. Application of the proposed device indicates that the device holds much better decay resistance than the galvanized steel and other common grounding materials. Its deductive lifetime is more than 60 a, which results in a life cycle total cost（LCC） equaling 38.1% of the grounding devices made of the galvanized steel. This satisfies the regulations of LCC in China.