杆塔基础和长垂直接地体组合接地性能及适用范围研究

Combined Grounding Performance and Application Range of Tower Foundation and Long Vertical Grounding Electrode

为了减小杆塔接地装置的占地面积,提出杆塔基础和长垂直接地体组合接地方案,为输电线路杆塔接地工程设计提供参考和依据。首先比较了传统接地装置和组合接地装置的占地面积,然后分析了各种影响因素作用下接地装置的接地电阻,最后考虑人身安全因素,得到了满足接地电阻和电位差要求的土壤电阻率范围。结果表明:组合接地方案能够满足小于2000Ω·m土壤环境的接地电阻要求,能够满足小于200Ω·m土壤环境的接触电压要求。在季节性冻土地区或深层土壤电阻率较低时,宜采用组合接地装置进行杆塔接地设计。

In order to reduce the land occupied area of tower grounding device,the combined grounding scheme of pylon foundation and long vertical grounding body is put forward,which provides reference and basis for pylon grounding engineering design of transmission lines.The land occupied area of the traditional grounding device and the combined grounding device are compared first,then the grounding resistance of the grounding device is analyzed under the action of various influencing factors,and finally the range of soil resistivity satisfying the requirements of grounding resistance and potential difference is obtained considering the personal safety factor.The results show that the combined grounding scheme can meet the requirements of grounding resistance in soil environment less than 2000Ω·m and contact voltage in soil environment less than 200Ω·m.In seasonal frozen soil area or when the resistivity of deep soil is low,the combined grounding device should be used for grounding design of tower.