斜接地极对正方形地网降阻效果的优化研究

降低变电站接地电阻,对保障人员、设备安全特别重要,敷设斜接地极是降低变电站接地电阻的重要措施。为确定斜接地极降阻效果,采用CDEGS软件建立仿真模型,分析了斜接地极布置位置、角度、长度、根数等对不同面积接地网的降阻效果和特征,进而确定了斜接地极的布置方式,并将斜接地极与垂直接地极进行对比。结果显示:敷设斜接地极能够有效降低变电站接地电阻,特别是对100 m×100 m以下地网降阻效果较好;均匀土壤中斜接地极降阻效果优于垂直接地极;分层土壤结构中,接地极的降阻效果取决于实际土壤结构。应综合考虑各种因素的影响,选择合适的降阻措施。

Resistance Reduction Optimization of Square Grounding Network Via Slanting Earthing Poles

Reducing grounding resistance of a substation is of utmost importance to guarantee the safety of personnel and equipments.Slanting earthing pole is effective on this purpose.In this paper,a simulation model is built with the software CDEGS to analyze the influences of position,angel,length,and strand number of slanting earthing pole on the resistance reduction of the square grounding network with different areas.Thus,an optimum layout of slanting earthing poles is determined.And a comparison between the vertical earthing pole and the slanting earthing pole is drawn.The results reveal that: the slanting earthing pole reduces grounding resistance of substation effectively,especially for the grounding network with an area smaller than 100 m×100 m;slanting earthing pole performs better in resistance reduction than vertical one in uniform soil,however their performance depends on the actual soil structure in layered soil.Therefore,all influencing factors should be considered to select an appropriate method for reducing the earthing resistance of a square grounding network.