500kV横沥变电站接地网降阻改造  

Resistance-reducing Transformation for Earthed Networks of 500 kV Hengli Substation

作　　者：万四维[1] 黄宪武[1] 

机构地区：[1]广东电网公司东莞供电局,广东东莞523008

出　　处：《广东电力》2011年第4期84-86,共3页Guangdong Electric Power

摘　　要：针对500kV横沥变电站接地网电阻值不满足安全运行的要求,需要进行降阻改造的问题,分析了站外扩大接地网面积、垂直深井爆破及压力灌降阻剂、电解离子接地极和斜井接地加物理降阻这4个改造方案的利弊,综合考虑横沥变电站的地质、地形、工况和规模等因素,选择斜井接地加物理降阻方案进行变电站接地网改造,改造后接地网电阻值达到了设计和运行的要求。Aiming at failure of resistance value of earthed networks of 500 kV Hengli substation to meet the safety requirement and the demand for resistance-reducing transformation,advantages and disadvantages of such four transformation schemes as size enlargement outside of the substation,vertical deep-well blasting and resistance reducer,ionic earth electrode and inclined shaft earthing plus physical resistance-reducing are analyzed.By comprehensive consideration of geology,terrain working condition,scale and otherwise of Hengli substation,inclined shaft earthing plus physical resistance-reducing is chosen for transformation for earthed networks,after which the resistance value can meet the requirements of design and operation.

关 键 词：大型变电站 接地网 降低接地电阻 土壤电阻率 

分 类 号：TM862[电气工程—高电压与绝缘技术]