Assessment of Induced Potential on Metallic Pipeline Located Nearby to EHV AC OHTL

Abstract

Utility pipelines are often laid in parallel with overhead high voltage power transmission lines (OHTL). Induced potential on the pipeline due to the electromagnetic coupling (EMC) effect can reach dangerous levels, resulting in potentially unsafe conditions for utility operating personnel and in those areas accessible to the public at large. Such induced potential can exasperate pipeline corrosion and cause undesirable electromagnetic interference on neighboring communication networks. In this paper, a pipeline located close to extra high voltage AC overhead transmission lines (EHV AC OHTL) is studied. In addition, the impact of pipeline location profiles and earth soil resistivity are discussed. The analysis is carried out by using Alternative Transient Program which is the modelling package of Electromagnetic Transient Program Software (ATP/ EMTP).