Optimal electric field performance of EHV transmission lines using ground shield conductors

Document Type : Original Article

Author

Department of Electrical Engineering, Shoubra Faculty of Engineering, Benha University, Cairo, Egypt.

Abstract

Abstract:
Assessment and mitigation of the environmental impact of EHV power lines is a subject
of current research due to the possible associated health hazards. The electric field
beneath the line and the field on the conductor surface are known to be main sources of
concern from an environmental standpoint. The present approach serves as means of
reducing the electric field under EHVAC lines using ground shield wires. The aim is to
determine the optimal ground shield wire heights and clearances to satisfy a set of field
limitations on the conductors as well as on the ground. Genetic Algorithms, GAs, are
employed to arrive at the required optimal clearances through an appropriate fitness
function. The merits of the proposed approach are demonstrated for 3-phase
horizontally-arranged 500 kV single circuit transmission line. Results show the
effectiveness and accuracy of the proposed approach.

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