الفهرس 
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Abstract
The thesis presents an investigation of the electrostatic field of a system of infinitely long parallel cylindrical sub conductors. Existing analytical methods can be used only to solve rigorously the field of simple geometries such as a single conductor over a ground plane and an isolated two-sub conductor bundle. For the more practical multi-sub conductor systems, until now only approximate analytical solutions have been obtained in which each sub conductor is represented by a line charge at its centre.
The method suggested for the accurate computation of the potential and electric field in the vicinity of a system of paralled circular cylindrical sub conductors, is based on a charge simulation technique and the principle of images. In this method, the charge on the sub conductors is represented by several axial line charges. Carefully chosen boundary conditions on the sub conductors surfaces allow the formulation of simultaneous aquations whose solution yields the assumed line charges, from which the potential and electric field are directly computed.
A computer program is developed which models a monopolar transmission line composed of a system of parallel cylindrical sub conductors placed above a Ground plane. The sub conductors are mode1ed by a system of line charges which are found using the method of simulation technique. After an adequate model is found, the program can calculate the potential and electric fi81d at any point in the sub conductors neighborhood. In particular, the program is designed to find surface fields and potentials for a particular sub conductor in t he system and/or to find equipotential contours in the sub conductors space.
Most of the work done is applied for actual smooth conductors such as those used on transmission lines in bundles of two (Horizontal or Vertical), three (Triangle or Inversed triangle) and four (Square-e or Diamond).
For the two-sub conductor case, the degree of accuracy of the present method of computation is checked against the well-known exact solution. It is shown that this method is very accurate even for small sub conductor spacing to diameter ratio (less than 5).
from another point of view, the method is checked for bundles of 2.3 and 4 sub conductors by comparing the computed field values with those experimentally measured.It is very satisfying to observe that the computed results bound fairly the measurements.
The present method of computation has the advantage that the rasults of simplified approximate methods are checked against it. Such methods are often convenient for fast preliminary estimates of a projected line only if the results obtained are fairly accurate. It is observed that for small spacing to diameter ratios, these methods become very inaccurate.