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The Importance of IAC Studies During Route Selection

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Colocation of a new transmission line with an existing pipeline right of way (ROW) can have many benefits including lower cost and quicker acquisition of easements. Public utility commissions and other government agencies may suggest or direct colocation with other utilities. However close alignment between transmission line and pipelines will result in inducing voltages and currents into the pipeline(s). These induced voltages and currents may have undesirable consequences for the pipeline inducing unsafe step and touch potentials damage to pipeline coatings and damage to the pipeline steel including AC corrosion. While there are many techniques available to mitigate these effects doing so may be very costly. Increasing separation distance between the utilities is generally more cost effective than providing very extensive mitigation. It is far better to assess these costs during the route selection process rather than to be committed to a preferred route than to discover that IAC mitigation will be very complex costly and will resulting delaying completion of the project. This paper presents a recent case history that fully illustrates the complexity time delays and cost associated with IAC mitigation for four large diameter natural gas lines from a newly constructed 220 kV wind farm transmission line after the preferred route has been selected and ROW had been purchased.

Product Number: 51319-13055-SG
Author: AKM Haque
Publication Date: 2019
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