To reveal the electromagnetic effect from UHV AC transmission line on buried oil/gas pipeline

modeling and simulations are conducted for the oil/gas pipeline of the natural gas transmission project from Sichuan Province to eastern region and the UHV transmission line of the power transfer project from Anhui Province to eastern region.According to the engineering parameters and common corridor design

computational models of the 1 000 kV transmission line and the berried oil/gas pipeline in respective cross arrangement and parallel arrangement are established using the software CDEGS.Then the interfering voltage and AC current density distributions on the pipeline are calculated in the conditions of single-circuit operation and double-circuit operation of the transmission line. And AC corrosion protection of the pipeline by applying solid-state decoupler with bare copper belt is given to reduce the interfering voltage on the pipeline. The results show that the pipeline will suffer moderate AC corrosion in normal operation of the transmission line

and the possibility of pipeline’s AC corrosion and the interfering voltage can be effectively reduced by grounding pipeline via bare copper belt and solid-state decoupler.This research may be helpful for safe operation of UHV transmission line and oil/gas pipeline

and may provide a reference for design of relative engineering.