高土壤电阻率地区牵引变电所接地设计

研究目的:厦深线某新建变电所,地形地质条件较为复杂,土壤电阻率较高。本文结合铁路规范及IEEE规范,在满足接触电势及跨步电势的基础上,对接地设计思路进行探讨,并通过比较其经济效益,选择出最优方案,为类似较高土壤电阻率条件下的接地设计提供参考。研究结论:牵引变电所的接地设计应结合实际情况,因地制宜地采用接地方案。在校验接触电势和跨步电势后,适当提高变电所接地电阻值,再采取不同降阻措施,可在确保设备及人身安全的前提下节约工程投资。

Earthing Design of Traction Substations in Regions with High Soil Resistivity

Research purposes:The earthing design idea is discussed in this paper for a newly-built traction substation on Xiamen-Shenzhen Railway with complex topographic and geologic conditions and high soil resistivity based on meeting the contact potential and step potential conditions in combination with requirements of current railway codes and IEEE standards concerned.At the same time,an optimal scheme is selected by comparison of economic benefits,providing a reference for the earthing design with similar soil resistivity condition. Research conclusions:A proper earthing scheme should be adopted for the traction substation in consideration of local conditions.The earthing resistance of the substation may be increased to some extent upon verifying the contact potential and step potential.On the basis of this,different resistance reducing measures can be adopted for saving investment of the project under the premise of ensuring equipment and personnel safety.