配电变压器高压侧工作于不接地、消弧线圈接地和高电阻接地系统，当该变压器的保护接地接地网的接地电阻符合公式(12．4．3)要求且不超过4Ω时，低压系统电源接地点可与该变压器保护接地共用接地网。电气装置的接地电阻，应符合下式要求：
1) for the high-voltage side of the distribution transformer working in the ungrounded, arc suppression coil grounded and high resistance grounded system, when the grounding resistance of the protective grounding grid of the transformer meets the requirements of formula (12.4.3) and does not exceed 4 Ω, the power grounding point of the low-voltage system can share the grounding grid with the protective grounding of the transformer. The grounding resistance of electrical device shall meet the following requirements:
R≤50／I (12．4．3)
R≤50／I (12．4．3)
式中 R――考虑到季节变化时接地网蠕动泵 保定网站建设 保定网站制作 保定网络公司 保定办公家具 保定轻钢别墅 的最大接地电阻(Ω)；
Where R - Maximum grounding resistance of Grounding Grid Considering seasonal variation (Ω);
I――单相接地故障电流；消弧线圈接地系统为故障点残余电流。
I - single phase ground fault current; the arc suppression coil grounding system is the residual current at the fault point.
2)低压电缆和架空线路在引入建筑物处，对于TN-S或TN-C-S系统，保护导体(PE)或保护接地中性导体(PEN)应重复接地，接地电阻不宜超过10Ω；对于TT系统，保护导体(PE)单独接地，接地电阻不宜超过4Ω；
2) for TN-S or TN-C-S system, the protective conductor (PE) or protective grounding neutral conductor (pen) shall be grounded repeatedly, and the grounding resistance shall not exceed 10 Ω; for TT system, the protective conductor (PE) shall be grounded separately, and the grounding resistance shall not exceed 4 Ω;