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Volume :13 Issue : 1 1986      Add To Cart                                                                    Download

Computation techniques for evaluating the electric field effects of single and double circuit HVAC overhead lines

Auther : M. H. SALAMA, Y. SAFAR AND M. SAIED

Department of Electrical and Computer Engineering, University of Kuwait, P.O. Box 5969, Kuwait

 

ABSTRACT

 

The description of two techniques for the digital computation of the environmental effects on the electric field of single- and double-circuit high voltage alternating current (HVAC) overhead lines is given. The towers can carry up to two 3-phase systems which differ in voltage levels, relative phase angles, number of subconductors in a bundle, tower dimensions and conductor radii. The results include computation of the voltage gradients at the ground surface as well as the surface of all conductors, including ground wires. Potential distribution, as function of time and location can also be obtained.

 

The first technique is based on replacing each energized subconductor by an equivalent line charge. From geometrical data, the potential coefficient matrix can be determined, which is then inverted to obtain the capacitance coefficient matrix, which if multiplied by the known voltages, results in the equivalent charges for all conductors. After that, voltage gradients as well as the spatial potential distribution can be obtained.

 

The second approach utilizes the charge simulation technique. For each energized subconductor, a number of line charges is assumed; these have to satisfy different boundary conditions such as zero tangential field component at the conducting surfaces. By solving the corresponding system of linear equations. the equivalent charges for all conductors can be found.

 

The two computer programmes using the methods outlined above have flexible features. They are applicable to cases including different numbers of circuits, bundles or voltage levels. They are tested for different cases, and the results for the surface voltage gradients of the conductors in some spccific cases of single circuit and symmetrical double-circuit towers are found to be in good agreement with the available standard charts such as those included in various EPRI research reports and other publications.

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