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Case Analysis Of Electromagnetic Interference Of AC Substation On Pipeline

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A substation is a place where the power system converts voltage and current and receives and distributes electric energy. When a phase line is abnormally connected to another phase line or ground, a large amount of current will flow into the ground through the grounding bed of the substation. In such case, if metal structures exist such as buried pipelines near the substation, the pipelines often withstand serious electrical interference 1, which causes stray current corrosion of the pipelines 2 and other safety problems.

Product Number: 51322-17517-SG
Author: Su Jin
Publication Date: 2022
Industry: Coatings
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$20.00
$20.00

A single-phase ground fault of the AC substation will cause electrical interference to the adjacent pipeline, mainly reflected in the touch voltage, step voltage, and coating breakdown voltage of the pipeline exceed the safety threshold. In order to evaluate the electrical interference effect of an AC substation on adjacent pipelines, the numerical simulation method is used to calculate the relevant safety parameters of the pipeline during the single-phase ground fault of the substation. For the case of touch voltage of the pipeline exceeding the safety threshold, the mitigation methods have been obtained by the software calculation. The specific mitigation method is to connect the pipeline to the grounding of the valve room through the solid state decoupler, and then set the gradient mitigation line
in parallel with the pipeline near the substation.

A single-phase ground fault of the AC substation will cause electrical interference to the adjacent pipeline, mainly reflected in the touch voltage, step voltage, and coating breakdown voltage of the pipeline exceed the safety threshold. In order to evaluate the electrical interference effect of an AC substation on adjacent pipelines, the numerical simulation method is used to calculate the relevant safety parameters of the pipeline during the single-phase ground fault of the substation. For the case of touch voltage of the pipeline exceeding the safety threshold, the mitigation methods have been obtained by the software calculation. The specific mitigation method is to connect the pipeline to the grounding of the valve room through the solid state decoupler, and then set the gradient mitigation line
in parallel with the pipeline near the substation.

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Product Number: 51317--9461-SG
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Challenges associated with coordinating the modelling, design, and installation of an alternating current interference and mitigation systems. The project consisted of a 65 kilometer long double circuit 500 kilovolt (kV) overhead transmission in a heavily congested right-of-way corridor with more than 80 pipelines.
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Variances in Pipeline AC Interference Computational Modelling

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The AC interference between High Voltage AC (HVAC) power lines and pipelines has been modelled with various software programs all of which have a variety of input data which results in various results and outputs.Important aspects such as the soil resistivity along the pipeline route can have a significant impact on the pipelines coating resistance. This in turn affects both the computed AC voltages and current densities both of which can significantly affect personal safety and corrosion of the pipeline.Therefore the spacing between these field measurements along the pipeline route can have a significant effect on the pipeline integrity. Soil resistivity measurements collected every 1000ft versus every 5280ft (1 mile) can have a dire consequence on the corrosion results and the matter is exacerbated where these soil resistivity measurement values change significantly along the route. The accuracy of the soil resistivity field data relative to the actual routing (wetlands rivers low and high resistivity’s etc.) will also affect the correct placement of the AC Mitigation (grounding) as well as the resistance of the grounding which in turn has a cost implication to the asset owners and/or operators.Other aspects such as the power line LEF/EMF may also be used to “calibrate” the AC Interference especially where load data is absent.This paper addresses the critical importance of collecting adequate data for the AC Interference studies to prevent costly installations and to mitigate the incorrect positioning of AC Mitigation systems due to inadequate information.
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Case Study - Sharing An AC Mitigation System

Product Number: 51322-17786-SG
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AC interference analysis between high voltage AC (HVAC) powerlines and buried pipelines is a matter of current interest due to the growing number of right-of-ways shared between powerline and pipeline infrastructure. This is only expected to increase as the worldwide energy demand grows considerably over the next 30 years,1 and stricter environmental regulations and policies are applied. Therefore, AC interference will continue to be an issue of concern for powerline and pipeline operators to protect the public, environment, and maintain asset integrity.
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