Research Of Electromagnetic Influence Of Normally Operating Power Lines On Buried Metallic Pipeline

As China's economy continueing to grow and increasing demand for energy, power transmission line and the buried pipeline expand rapidly. Because of the selectivity of electric power industry and oil and gas industry are almost similar, electromagnetic influence on the buried pipeline near the transmission line becomes increasingly prominent. In this paper, under the science and technology project of the State Grid Corporation " research of electromagnetic influence of 1000kV UHV AC double-circuit transmission line on the buried metallic pipeline and protective effects ", investigated the numerical methods of self-impedance and mutual impedance for the multi-conductor transmission line system, considering with the influence of the soil stratification, and applied the results to calculate the biggest interference voltage of the coating layer of the buried pipeline. Finally, according to the safety voltage threshold and pipeline leakage current density limit,the minimum safety distance between transmission line and buried pipeline is recommend, which has important guiding significance on the practical engineering.