51312-01664-Accurate Modelling and Troubleshooting of AC Interference Problems on Pipelines

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Product Number: 51312-01664-SG

ISBN: 01664 2012 CP

Author: Leslie Bortels

Publication Date: 2012

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Cases of close proximity of high voltage transmission lines and metallic pipelines become more and more frequent in high population density regions. Therefore there is a growing concern about possible hazards resulting from the influence of electrical systems: safety of people making contact with the pipeline damage to the pipeline and CP equipment. Hence it is not surprising that there is an industrial need for mitigating AC interference. This paper will discuss capabilities of a software tool to predict AC currents and voltages induced on metallic structures near AC power lines by electrostatic coupling effects electromagnetic induction and resistive coupling effects. Situations can be studied under normal operational conditions as well as for the occurrence of fault currents.Most available computer programs limit the modeling capabilities to parallel or near parallel geometries. In addition most of the available programs are restricted in the number of pipelines transmission lines and (direct) bonds that can be modeled. This is a serious restriction since in many corridors a large number of pipelines are bonded together e.g. for cathodic protection purposes.The examples given in this article will deal with complex configurations of pipelines in ROW of high voltage transmission lines. First simulation results are compared with field data allowing to specify more precisely the pipeline parameters (coating soil resistivity …) and refine the computational model. Secondly the effect of different operating modes of the high voltage transmission lines is studied and several what-if-scenarios are investigated in order to predict safe operation conditions.From the examples the benefits of predicting AC interference problems within Pipeline Integrity Management Systems will be demonstrated. Through modeling the hazardous situation can be localized and the effect of corrective actions can be proof-simulated before being applied in the field.Keywords: pipeline AC interference prediction simulation technology