Author(s) :

Obi, Patrick I., Amako, Ejike A., Ezeonye, Chinonso S..

Volume/Issue :

Abstract :

This paper presents the study of characteristics of corona effect on AC high voltage transmission line with variation of parameters associated with the transmission line. This objective was achieved with the aid of MATLAB m-file function software as it has become the widely used and acceptable application for electrical analysis. The line specifications are 220 kV line-to-line, 50 Hz, 1.2 cm conductor radius, 200 cm distance between conductors, and 0.85 conductor surface condition factor. The responses of the simulation on the effect of corona on transmission line show that as line width from the point of electric field intensity is decreased towards the conductor radius, the potential gradient increases, and at point when it is decreased to conductor radius, potential gradient attained its maximum value. Also when the line width is increased towards the value of conductors distance, the potential gradient tends to infinity. When conductor surface condition factor is increased, the critical disruptive voltage increases while the power loss decreases. On the other hand, increase in frequency increases power loss and the variation of line voltage from minimum to maximum value increases the potential gradient and subsequent decrease in corona power loss. However, as the decrement in corona power loss gets to the point of 180 kV line-to-line critical disruptive voltage, the power loss started increasing thereafter. The results obtained from this work in relation to other literatures show that in designing transmission line, these effects need to be considered for the lines to properly manage corona effect during discharges.

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