变电站接地网布置方式及设计规范差异对比分析研究

Comparative Analysis Between Substation Grounding Grid Layout and Differences from Design Specifications

根据DL/T 621—1997《交流电气装置的接地》和GB/T 50065—2011《交流电气装置的接地设计规范》中对变电站接地网的相关设计要求,以某500 k V变电站土壤电阻率测试结果为基础,对两个规范中用到的工频接地电阻、转移电位、接触电位差、跨步电位差等重要参数指标进行对比计算分析,得出两本规范之间的异同,并分析了差异产生的原因,供相关设计人员参考。

According the requirements of grounding grid design in substation which quote from Grounding for AC electrical installations（DL/T 621—1997） and code for design of AC electrical installations earthing（GB/T 50065—2011）, based on the earth resistivity test results in 500 kV substation, this paper carried out analysis of contrast calculation for important parameter indexes including industrial frequency earthing resistance, shifting potential, contact potential difference and step potential difference between the two specifi cations. The similarities and differences between the two specifi cations were obtained and the caused reasons were analyzed to provide references for the relevant designers.