الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 121 |  |  |
| | | from | 121 | | |
Abstract
High voltage transmission lines (HVTLs) are used in transmitting power
between cities and due to right of way (ROW) rules HVTLs forces nearby
objects, like railways, communication cables and pipelines, to join the same
corridors either parallel or partially parallel proximity. This is because of
reduction in economic costs and limited free space area. Due to this sharing, an electromagnetic field from HVTLs affect neighboring pipelines by means of capacitive, inductive and conductive effects causing induced voltages over the metallic pipelines, which may lead to harmful effects to the pipeline itself like pitting corrosion, shock for workers who are in direct contact with these
pipelines and also economical problems for the governments. Therefore,
mitigation techniques shall be applied to minimize these problems.
This Thesis presents a comprehensive study of induced voltages along a
section of El-Fayoum/Dahshour Gas pipeline, which lay in right of way of three HVTLs, two lines of them are 500 kV and third line is 220 kV, under normal operating condition as well as abnormal conditions of the power transmission lines. As abnormal conditions include single line to ground (SLG), double line
to ground (DLG), line to line (LL), three lines to ground (LLLG) faults and lightning strokes (direct and indirect). Alternative Transients Program (ATP) program is used to simulate the power line–pipeline system under all operating conditions. Moreover, the influence of fault locations, either at 25%, 50% and 75% of the power line length, on the
pipeline induced voltages is studied. Furthermore, variation of soil resistivity on pipeline induced voltages under normal and SLG fault is analyzed. Finally, three mitigation methods are applied (cancellation wires, gradient control wires and polarization cells) to reduce pipeline induced voltages to acceptable limits that can protect pipeline from corrosion and workers from electrical shock. In addition, a comparison between differenused mitigation
techniques from economical point of view is carried ou.