高土壤电阻率地区变电站降低接地电阻措施的探讨

接地是保证电力系统正常运行和人身安全的重要手段,确保高土壤电阻率地区变电站接地系统的安全性是电力系统广泛关注的问题。针对高土壤电阻率地区变电站接地网的接地电阻很难满足规程要求的问题,通过对接地电阻偏大的危害进行分析,探讨高土壤电阻率地区变电站降低接地电阻的方法,提出了安装三维立体接地网、空腹式接地装置、敷设电解地极等安全有效降低接地电阻的方案以及降低接地电阻应注意的问题。

Exploration of Measures to Lessen Grounding Resistance in Substation of High Soil Resistivity Area

Grounding is an important means to ensure the normal operation of the power system and personal safety.To ensure security of grounding system of the substation in areas of high soil resistivity is an issue of great concern in power systems.Aiming at the problem that the earthing resistance of substation grounding net is difficult to meet regulations＇ demand in high soil resistivity areas,the analysis to the constitution of earthing resistance and measurement as well as the damage of higher earthing resistance and discussing methods of reducing earthing resistance by substation in in high soil resistivity areas,the scheme which reduces earthing resistance safety and effectively,such as installing three dimensional stereo-earth screen;limosis type of earthing device;lying electrolysis geographic pole etc as well as the attentive problems when earthing resistance is reduced,are put forword.