Study of the coupling interference of high-voltage transmission lines on adjacent buried steel pipelines based on CDEGS

Generally, transmission lines and buried pipelines constantly share the same corridor to save land and public resources during urban construction. In this paper, the electromagnetic interference of high-voltage transmission lines on the surrounding buried steel pipelines is studied by considering a public corridor. This corridor com-prises a 220 kV AC transmission line project and buried metal pipelines in Shanghai. The Current Distribution, Electromagnetic Field, Grounding and Soil Structure Analysis (CDEGS) software is used to study the AC inter-ference situation in this corridor. The level of interferences caused by the AC transmission lines on the pipelines under normal load and single-phase fault conditions is investigated. Zinc strip mitigation measures are set up for the normal load and single-phase fault operation results, effectively reducing the degree of AC interference on the pipelines. Moreover, several new mitigation measures are proposed. The safe implementation of the stable and reliable operation of the transmission line and pipelines is ensured in this paper. The research conclusions can provide reference and guidance for solving the problem of AC interference generated by high-voltage trans-mission lines on the surrounding buried pipelines and generate new ideas designing of mitigation measures.