الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
The increase of power demand has increased the need for transmitting huge amount of power over long distances.
Large transmission lines configurations with high voltage and current levels generate large values of electric and magnetic fields stresses which affect the human being and the nearby object located at ground surfaces. This has in turn prompted increased activity in the documentation of calculation techniques to accurately predict field strengths in isolated conducting bodies coupled to lines of all voltages and design configurations.
Overhead transmission systems required strips of land to be designed as right-of-ways (R.O.W.). These strips of land are usually evaluated according to same aspects; the most important one is the operating effects of the energized line including electric and magnetic field effects. Therefore determination of the maximum value of the electric and magnetic field stress at ground surface is very necessary and important. It is always required to minimize the amount of land set for high voltage (current) transmission facilities. This can be achieved by the reduction of the field stress at ground level which is also considered as the most object of efforts to minimize the field effects of such high voltage A.C. lines.
This thesis contains five chapters:
1. First chapter considered as introduction for the ”Mitigation of Electro-Magnetic Fields Near Overhead Transmission Lines”.
2. Second chapter presents a review of previous work for the Electric and Magnetic field studies. This chapter also presents the biological effect from the electromagnetic fields.
3. Third chapter review the different methods of electric and magnetic field computations. From which two flow charts were presented, one flow chart for the electric field calculation and the second for the magnetic field.
Third chapter also introduces the steps to build computer program to calculate the electric and magnetic field.
4. Fourth chapter introduces proposed (built-up) programs. These programs were applied for a previously calculated overhead transmission line and for actual field measurements for the electric and magnetic fields under overhead transmission line.
Fourth chapter also presents a comparison between the actual field measurements and the output results from the proposed program. The error was within 1-3%, this give the trust that this program is running okay. Then this program was applied for different types of mitigations were studied by the use of the computer program.
5. Fifth chapter presents the final conclusion of this thesis presents different overhead transmission line module which will satisfy the electromagnetic field mitigation and reduce the right of way. This chapter also presents recommendations for future work.