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01604 AC Mitigation Requirements: A Parametric Analysis

Product Number: 51300-01604-SG
ISBN: 01604 2001 CP
Author: Robert D. Southey, Eng., Winston Ruan, Ph.D., Farid P. Dawalibi, Eng., Ph.D.
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This paper presents a parametric analysis in which required mitigation wire length is determined for a pipeline subjected to magnetic field induction from a nearby high voltage transmission line, during load conditions. The effects of the following variables on induced voltages and mitigation requirements are studied: length of parallelism, separation distance, transmission line cross-sectional configuration, type of static wire, soil resistivity, load current magnitude, and pipeline/transmission line crossings. The goal is to provide the reader with a means to estimate mitigation requirements before a detailed study is performed. In the scenarios studied, which are based on a reference case consisting of a 10-mile (16.1 km) parallelism between a well coated 24" (61 cm) pipeline and a 230 kV transmission line carrying a load current of 1000 A, the required length of zinc anode ribbon, which provides the mitigation, varies from 0 to 1320 feet (402 m). Note that this does not include the length of ribbon that might be required to protect exposed pipeline appurtenances, although this requirement is discussed in the paper, nor does it include the length of ribbon that would be required to protect the pipeline coating from damage during fault conditions. Fault conditions will be the subject of a subsequent paper. Keywords: AC induction, parametric analysis, interference mitigation requirements, load conditions
This paper presents a parametric analysis in which required mitigation wire length is determined for a pipeline subjected to magnetic field induction from a nearby high voltage transmission line, during load conditions. The effects of the following variables on induced voltages and mitigation requirements are studied: length of parallelism, separation distance, transmission line cross-sectional configuration, type of static wire, soil resistivity, load current magnitude, and pipeline/transmission line crossings. The goal is to provide the reader with a means to estimate mitigation requirements before a detailed study is performed. In the scenarios studied, which are based on a reference case consisting of a 10-mile (16.1 km) parallelism between a well coated 24" (61 cm) pipeline and a 230 kV transmission line carrying a load current of 1000 A, the required length of zinc anode ribbon, which provides the mitigation, varies from 0 to 1320 feet (402 m). Note that this does not include the length of ribbon that might be required to protect exposed pipeline appurtenances, although this requirement is discussed in the paper, nor does it include the length of ribbon that would be required to protect the pipeline coating from damage during fault conditions. Fault conditions will be the subject of a subsequent paper. Keywords: AC induction, parametric analysis, interference mitigation requirements, load conditions
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