庆阳市某变电站接地网改造工程设计  

作　　者：徐耕 王容鹤 

机构地区：[1]庆阳市气象局,甘肃庆阳745000 [2]庆阳市资源勘查院,甘肃庆阳745000

出　　处：《科技创新与应用》2022年第17期83-87,共5页Technology Innovation and Application

基　　金：庆阳市气象局科研项目(QY2021-6)。

摘　　要：文章对甘肃省庆阳某变电站原接地网腐蚀断裂、接地电阻超标等问题进行分析,提出接地改造目标。根据现场土壤电阻率等因素的测试和调查,结合规程和实际条件,选用重新铺设站内接地网,做水平外引,施阻防腐剂并利用自然接地体的降阻方案。提出两套降阻方案,一是在土壤电阻率比较低的果林处外引水平接地体结合降阻剂实现,二是在变电站内仓库的周围铺设水平接地体与自来水管并联,实现降阻目的。方案实施后对新地网接地参数测量结果表明,接地电阻为0.55Ω,最大跨步电压为20.89 V,符合目标值0.94Ω、248.1 V的要求。In this paper,the problems of corrosion fracture and excessive grounding resistance of the original grounding grid in a substation in Qingyang,Gansu Province are analyzed,and the goal of grounding transformation is put forward.According to the test and investigation of on-site soil resistivity and other factors,based on regulations and actual conditions,the resistance reduction scheme of re-laying the grounding grid in the station,horizontal external introduction,applying resistance preservatives and using natural grounding body was selected.Two sets of resistance reduction schemes are put forward,one is to introduce horizontal grounding body based on resistance reducing agent in the fruit forest with relatively low soil resistivity.The other is to lay a horizontal grounding body in parallel with the tap water pipe around the warehouse in the substation to achieve the purpose of resistance reduction.After the implementation of the scheme,the measurement results of the grounding parameters of the new grounding grid show that the grounding resistance is 0.55Ωand the maximum step voltage is 20.89 V,which meets the requirements of 0.94Ωand 248.1 V.

关 键 词：接地网改造 接地电阻 降阻措施 GPF-94高效膨润土降阻防腐剂 

分 类 号：TM862[电气工程—高电压与绝缘技术]