接地材料和连接方式的选择

Selection on grounding materials and connecting methods

结合国内外的电力规范,介绍发电厂、变电站接地网常规做法上材料选择的差异,比较其性能和价格上的不同,并按规范、通过计算说明不同的连接方式对材料截面积的影响。得出结论:就接地材料而言,铜与钢相比,铜的导电性和耐腐性好,所需的最小截面积小,造价低;就导体连接方式而言,火泥熔接法较其它接法节省铜材,且连接头品质较好。

The differences in the type,performance and costs of conventional materials for grounding networks in power plants and substations at home and abroad are compared in light of relevant power standards.The effects of varying connecting methods on the sectional area of the materials are illustrated through computations as per standards.A conclusion is drawn that as for grounding material,copper is of better conductivity and rotproofness,less minimum sectional area and lower costs as compared with steel; as for conductor connecting means,exothermic welding is economic and superior in joint performance to other methods.