地铁杂散电流对埋地金属管道阴极保护的影响

运用有限元分析软件ANSYS建立了走行轨-大地-金属管道的有限元模型。通过改变走行轨回流、走行轨纵向电阻、土壤电阻率、走行轨与金属管道间距大小,模拟杂散电流的影响,模拟结果表明:走行轨回流越小、土壤电阻率越大、走行轨与管道间距越小对阴极保护电位的影响越小;当走行轨电压载荷为80 V、走行轨与金属管道间距为20 m时,杂散电流无法使金属管道阴极保护电位偏离正常范围。

Effect of Metro Stray Current on Cathode Protection for Buried Metal Pipelines

Software ANSYS is used to establish a finite element model of the running track-earth-steel pipeline.By changing the running rails reflux,running track longitudinal resistance,bsoil resistivity and the spacing sizes between running track and metal pipe tracks,the factors of stray current are simulated.It shows that the lower the running track current,the higher the soil resistivity,the smaller the space between running track and steel pipeline,the smaller the impact on cathode protection potential.When 80V voltage load is imposed to the running track,the distance between running track and steel pipeline is about 20 m,the stray current will not influence the cathode protection potential obviously.