垂直型直流接地极设计探讨

针对不同系统运行条件及土壤电阻率对接地极设计的影响进行分析，指出了额定电流持续运行时间较长会导致发热问题严重，电极井孔径扩大，增加施工难度，土壤电阻率对溢流密度及不均匀程度、跨步电压值的影响较大。提出了合理优化接地极设计条件，降低额定电流持续运行时间，尽量降低最大溢流密度及不均匀程度，减小电极地面跨步电压值的建议。此外，计算表明与水平型接地极相比，垂直型直流接地极并不能减小对周围环境的影响，不同型式直流接地极对周围环境的影响差别很小。

Discussion on DC Vertical Ground Electrode Design

The influences on DC vertical ground electrode design are analyzed in view of different operating conditions and layering of soil resistivity. Heating problem is more serious while continuous running time under rated current is longer. Radius of electrode well should be enlarged and the construction difficulties become higher, accordingly. Distribution of current releasing-density and step voltage are under the influence of different type of Layering of soil resistivity. The suggestions are given as follows: optimize the input criterion sensibly, reduce continuous running time under rated current, current releasing-density and step voltage of electrode. In addition, for vertical ground electrode , the impact to surroundings can't be reduced compared to horizontal ground electrode. The difference of impact to surroundings is small for different type of ground electrodes.