20lO 7th Inteational Multi-Conference on Systems, Signals and Devices The Effect of Compensating Conductors' Parameters of 500kV Transmission Line on Right-of-Way and Corona Adel Z El Dein Department ofEleetrieal Engineering High Institute ofEnergy, South Valley University Aswan, Egypt azeinm200 l @hotmail.eom ABSTRACT The use of Extra-high voltages transmission lines causes many problems, that due to the high value of the electrostatic field on the ground level which has an effect on human beings, animals, and plants. This paper investigates the effects of the compensating conductors' parameters, namely, the number of the compensating conductors, their radii, their heights above the ground and the spacing between them, on the Right-of-Way (ROW), and Radio interference level (RI). Index Terms-OHTL, Electric Field, Compensating conductors 1. INTRODUCTION Transmission lines are oſten equipped with a compensating conductor (shield wire or overhead earthwire). A compensating conductor is a conductor that is usually grounded at the top of the supporting structure to minimise the Likelihood of direct lightning strikes to the phase conductors. This paper presents a theoretical simulation using the Charge Simulation Method (CSM) and the Image Method (1M) for the High Dam-Cairo 500kY transmission line to investigate the effect of compensating conductors' parameters namely, the number of the compensating conductors, their radii, their heights above the ground and the spacing between them, on the Right-of-Way (ROW), and Radio interference level (RI). The paper shows that, the compensating conductors can reduce the electrostatic field on the ground level, under the transmission lines, but the electric surface gradient on the phase conductors will be increased, thus increasing the corona effects. 2. INFLUENCE OF COMPENSATING CONDUCTORS' PARAMETERS ON RIGHT OFWAY AND ELECTRIC SURFACE GRADIENT ON LATERAL AND CENTRAL PHASES 978-1-4244-7534-61101$26.00 ©2010 IEEE The presence of compensating conductors on an Egyptian 500kY transmission line can be considered in the calculation by evaluating the consequent variation of the right of way (ROW) of the line, which is defined as the distance from the center phase to a point where the electrostatic field at one meter above the ground level is 1.5kY/m [1]. In this paper, the Charge Simulation Method and Image Method are used to calculate the electrostatic field in the vicinity of the Egyptian 500kY transmission line [2]. Details about the CSM are given in the Appendix (A). Figure (1) shows the compensating conductors distribution over the Egyptian 500kY transmission line, also shows the geometrical parameters of the transmission line. All calculations are done under 500kY TL single circuit, by using the data in appendix (8). Competing Conductor lr 5 1 2r H Hg ROW p Ground unl Figure 1. Configuration of compensating conductors above the High voltage Transmission line Where: S H Hg n g r rg SI separation between phases, m height of the phase conductors, m height of compensating conductor, m number of compensating conductor, equivalent bundle radius, m radius of compensating conductor, m distance between the two adjacent compensating conductors, m. Figure (2) shows the variation of Electrostatic Field (kY/m), at one meter above the ground level, with the