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The inductive coupling between ultra-high voltage (UHV) transmission lines and nearby underground pipelines raises the potential of pipelines which threatens the pipeline security and reliability. In this chapter, a transmission line–pipeline model is established based on the commercial software CDEGS, and the electromagnetic interference is simulated and analyzed. The pipeline potentials at different parallel distances are calculated in consideration of the effect of the overhead grounding wire. The simulation results are in conformity with the theoretical analysis. On this basis, a real 750-kV transmission line, and the nearby gas line model are built and simulated. The results show that the long distance of parallel and oblique approach can lead the maximum pipeline grounding potential raise (GPR) to exceed 100 V, i.e., 10 times of the safety threshold of 10 V. The solution is proposed and simulated in this chapter, and the maximum GPR of a pipeline is reduced to less than 10 V.
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