冻土地区某变电站接地方案研究

Study on Grounding Scheme of a Substation in Permafrost Area

对冻土地区某变电站接地网设计了等间距地网和不等间距地网+均压带2种方案,经仿真计算,不等间距地网+均压带方案能满足安全运行要求。为解决土体及接地体热胀冷缩影响接地体的寿命,建议地下接地体设置伸缩节,伸缩节最大间距不大于30m。

Two schemes for the grounding grid of a substation in permafrost area are designed, namely equally spaced grounding grids and unequally spaced grounding grids+uniform pressure zone.Through simulation, the second scheme can satisfy the requirements of safe operation.To solve the problem that expansion and contraction of the soil and grounding body will affect the life span of the grounding body,it is suggested that expansion joints are set in grounding body,with a maximal distance of 30 m between the joints.