Influence Factors of AC Mitigation Effectiveness of Zinc Ribbon Ground Bed

The influence factors and corresponding influence rules of AC mitigation effectiveness for zinc ribbon ground bed were studied by numerical simulation technology. Results show that AC mitigation effectiveness of horizontal zinc ribbon decreased with the increase in the distance between ground bed and pipeline, but there existed a maximum distance. With the increase in the buried depth of ground bed, the AC voltage of pipeline in the coverage of zinc ribbon ground bed increased, while the AC voltage of pipeline out of the coverage of zinc ribbon ground bed decreased, and the effective influence range of zinc ribbon ground bed increased. Within a certain length of zinc ribbon, the mitigation efficiency increased with the increase of zinc ribbon length. But there was no distinct increase for the mitigation efficiency when the zinc ribbon length exceeded a certain value. The center of horizontal zinc ribbon should be laid in the location close to the pipeline with maximum AC voltage. With the increase in interval distance of connection between ground bed and pipeline, the AC voltage of pipeline increased gradually. The economical and efficient connection distance was about 500 m, and the best connecting location was on the pipeline with maximum AC voltage.