Electromagnetic interference of high voltage transmission lines on oil and gas pipelines: impact of data input and coupling model on mitigation actions

Abstract:

Electromagnetic interference caused by high voltage electric transmission lines (HVTL) on neighboring metallic utilities such as oil and gas pipelines has increased significantly in recent years. This is due to the increase in load and short-circuit currents in the electrical network as a result of growing energy demand. Another reason for increased interference levels on pipelines originates from the need to share common corridors with HVTL in urban environment. To keep personal safety and infra-structure integrity it’s necessary to comply with safety regulations and standards concerning electric shock on people and stress voltage on coatings, insulation flanges and rectifiers for cathodic protection. To calculate electric shock and stress voltages it’s necessary to model the electric coupling between HVTL and pipelines. There are several methods and software to assist this calculation. However, a critical step is to collect technical data from electric utilities and oil and gas utilities to build the coupling model, addressing capacitive, inductive and conductive effects. If wrong or incomplete data are supplied even sophisticated coupling models may deliver wrong results. In fact, with typical interference study limited data are available, and, as a result, there is a bias to assume configurations leading to highest voltage stress, and consequently, extensive mitigations actions are recommended by these studies. The objective of this paper is to analyze the impact of simplified assumptions or missing data on coupling model, and based on results, to suggest a minimal core to consider in an interference study. The analysis was conducted in a corridor with two pipelines and two HVTL, analyzing the effect of running simulations with and without rectifier anode ground resistance and considering both overhead ground wire of two HVTL. Results show a reduction about 42% on both stress voltage on coating pipeline and electric shock, which may have a significantly impact on mitigation actions


Reference:

PEREIRA FILHO, Mario Leite; FERREIRA JR., Antonio Francisco Gentil; GOEBEL, Pierre; PIMENTEL, Gustavo A.; LAURINO, Eduardo W.; PIMENTA, Gutemberg de Souza; ARAUJO, Marcelo . Electromagnetic interference of high voltage transmission lines on oil and gas pipelines: impact of data input and coupling model on mitigation actions. In: RIO PIPELINE CONFERENCE & EXPOSITION, 2013, Rio de Janeiro. Proceedings… 6 p.

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