Lightning protection of unshielded overhead medium voltage power lines in South Africa

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Paper number
263
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Beutel, Andreas, Eskom Holdings SOC Ltd, South Africa
McLaren, Bruce, Eskom Holdings SOC Ltd, South Africa
Geldenhuys, Hendri, Eskom Holdings SOC Ltd, South Africa
Dirkse Van Schalkwyk, Willem, Eskom Holdings SOC Ltd, South Africa
Van Coller, John, University of Witwatersrand, South Africa
Abstract
South Africa has an extensive overhead electricity distribution network at medium voltage (MV). It also has a significant amount of lightning in most areas. The purpose of this paper is to report on South African experiences with respect to lightning protection of its overhead MV power network, and how designing a line for acceptable lightning performance impacts other aspects such as bird safety, pollution performance and terminal equipment reliability. Strategies covered include different insulation levels, bonding and earthing arrangements and pole-top configurations. Experiences from the laboratory and the field are included. It is concluded that the presently used configuration of a partially bonded structure with lightning insulation level of 300 kV performs more than adequately, but that initial experience with alternative configurations indicates that the network performance could be optimised.
Table of content
Keywords
Publisher
AIM
Date
2019-06-03
Permanent link to this record
https://cired-repository.org/handle/20.500.12455/782
http://dx.doi.org/10.34890/1003
ISSN
2032-9644
ISBN
978-2-9602415-0-1