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The Evolution of AC Predictive and Mitigation Software

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This paper outlines the essential features required in a software package that has sufficient capability to accurately predict and mitigate AC induction effects upon pipelines for a majority of rights-of-way.

Product Number: 51317--8912-SG
ISBN: 8912 2017 CP
Author: John Dabkowski
Publication Date: 2017
Industry: Energy Generation
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Approximately forty years ago the first software for calculating AC induced potentials on buried pipelines collocated with overhead electric transmission lines emerged. Its content reflected the needs at the time. For example, the analysis of induction effects for simple rights-of-way containing a limited number of transmission lines and parallel pipelines. In the interim, rights-of-way have become more complex requiring updated software to reflect the prevailing state of the art, which by virtue of academic research and field experience has been continuously advanced. This paper outlines the essential features required in a software package that has sufficient capability to accurately predict and mitigate AC induction effects upon pipelines for a majority of rights-of-way. Limiting the software suite to only the essential features provides for a more friendly user interface and a "short learning curve". A rationale for the software considered minimally essential is provided.

Initial topics discussed are optimum pipeline segmentation, and the limitations of a single-layer soil resistivity model.

For steady state operation, the effects of transmission line current imbalance, and a new mitigation methodology required when jointly mitigating pipe potential and current density are discussed.

Transmission line fault analyses include software requirements for calculating the current injection level at the faulted tower and the concurrent current split factor, which determine the magnitudes of the incident inductive and conductive coupling components.

Keywords: AC pipeline induction, AC pipeline mitigation, pipeline AC interference, AC pipeline corrosion, soil resistivity, fault current, transmission line imbalance, AC corrosion current density

Approximately forty years ago the first software for calculating AC induced potentials on buried pipelines collocated with overhead electric transmission lines emerged. Its content reflected the needs at the time. For example, the analysis of induction effects for simple rights-of-way containing a limited number of transmission lines and parallel pipelines. In the interim, rights-of-way have become more complex requiring updated software to reflect the prevailing state of the art, which by virtue of academic research and field experience has been continuously advanced. This paper outlines the essential features required in a software package that has sufficient capability to accurately predict and mitigate AC induction effects upon pipelines for a majority of rights-of-way. Limiting the software suite to only the essential features provides for a more friendly user interface and a "short learning curve". A rationale for the software considered minimally essential is provided.

Initial topics discussed are optimum pipeline segmentation, and the limitations of a single-layer soil resistivity model.

For steady state operation, the effects of transmission line current imbalance, and a new mitigation methodology required when jointly mitigating pipe potential and current density are discussed.

Transmission line fault analyses include software requirements for calculating the current injection level at the faulted tower and the concurrent current split factor, which determine the magnitudes of the incident inductive and conductive coupling components.

Keywords: AC pipeline induction, AC pipeline mitigation, pipeline AC interference, AC pipeline corrosion, soil resistivity, fault current, transmission line imbalance, AC corrosion current density

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