云数据中心与变电站共站时接地网连接方式

Connection Method of Grounding Grids for Internet Data Center Co-sited with Substation

云数据中心占地面积巨大、电能需求也巨大,需要与配套的变电站共址建设,两部分接地网之间的相互影响和连接方式是云数据中心设计中需要考虑的重点问题。以某实际云数据中心与变电站共址为例,建立电磁场数值计算模型,通过仿真计算研究不同接地连接方式时,变电站与数据中心的地电位、接触电位差、跨步电位差等的分布,提出经济合理的均压措施。经过分析可知,当云数据中心与变电站接地网分别独立布置时,变电站接地网与其他接地网之间形成了较大的电位差,影响人身和设备安全。建议各接地网相互紧密连接,从而在各接地网之间获得良好的均压效果,保证人身和设备安全。

Cloud data center demands huge area as well as enormous amount of electric-power, thus it needs to be built on the same site with its supporting substation. In the design of cloud data centers with a substation, one of the key issues is how the grounding grids of the two parts affects each other, and how they should be connected. Taking one actual cloud data center which has a substation constructed aside for example, we established its numerical model for electromagnetic field calculation. Simulation and calculation reveal that, while using different connecting methods between the grounding grids, how the ground potential rise, touch voltage difference, and step voltage difference are distributed on the cloud data center and its supporting substation. Further, we put forward economical and reasonable ways to make the ground poten- tial rise evener. The analyses show that when the ground grids of the cloud data center and its supporting substation are separately laid, larger voltage difference is formed between the substation grounding grids and the rest grounding grids. This will do great harm to human and equipment safety. Thus, we suggest that different grounding grids should be closely connected so as to obtain good voltage balance between different grounding grids which is very useful for human and equipment safety.