脉冲泄流时土壤条件对冲击接地阻抗的影响
Influence of the soil on transient grounding resistance under pulsed discharging current
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摘要: 为了探寻电流脉冲泄流时，设备的接地是否有效可靠，用FDTD法分析了脉冲泄流时均一土壤、分层土壤及局部改善土壤的电导率对冲击接地阻抗（TGR）的影响。结果表明：大地电导率对冲击接地阻抗的影响很大；对均一土壤，TGR随大地电导率的增大而减小，大地电导率越大，TGR对接地体的埋深越不敏感。对分层土壤，接地体要埋在大地电导率大的土壤层中，且不要靠近交界面；局部改善大地导电性能对降低TGR效果明显，TGR对改善区域的体积非常敏感，而当电导率大于一定值时，大地电导率的再增加，对TGR的影响不明显。Abstract: The influences of homogeneous, layered and fractional improved conductivity soil on transient grounding resistance (TGR) under pulsed discharging current are analyzed by using FDTD method in this paper. The results show that the ground conductivity has significant influence on TGR. In homogeneous soil, TGR and the influence of the buried depth of the grounding conductor on TGR decrease with increasing ground conductivity. In layered soil, the grounding conductor should be buried in the high conductivity layered soil, and not near the layered boundary. The locally improved conductivity will decrease TGR,and TGR is sensitive to this locally improved soil volume.And for the locally improved soil where the conductivity is enough large, the farther increasing of the conductivity has little effe
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