Application of Distributed Shallow Buried Anode in Station Area Cathodic Protection

The potential of the station and trunk line pipeline under the protection of different forms of anode ground bed was tested by instantaneous power-off method to study the influence of anode ground bed with different distribution forms on regional cathodic protection effect and main pipeline interference. The results showed that in the dense area of buried metal structures, due to the shielding effect of grounding grid, it was difficult to achieve effective cathodic protection for the protected pipeline in this area by using deep well anode ground bed. When the distributed shallow buried anode was buried near protected pipeline, the cathodic protection current could reach the surface of protected pipeline through a short path, so that protected pipeline could be effectively protected. Deep well anode ground bed current had a wide distribution range, which was easy to flow into the pipeline from the position where trunk line pipeline was far away from the station, and then flow into the station through the outside of station insulation joint, which would cause potential outside the insulating joint to be positive and form cathode interference. The distributed shallow buried anode and flexible anode caused less interference to trunk line pipeline.