The usual lightning protection of high volt-age overhead lines is the usage of groundwires. In some cases, they cannot be used. This paper evaluates the effectiveness of different alternative protection schemes using surge arresters for a 132kV unshielded overhead line. The protection schemes are: a surge arrester at each conductor and tower, a surge arresters only at the central conductor and every tower (the configuration studied has the central conductor higher than lateral ones at therefore acts as a shield wire) and a surge arrester at each conductor and one out of two towers. The last two protective schemes are consid-ered due to economic reasons. Number of annual flashovers in a 100km line with the different protec-tion schemes is computed following IEEE recommen-dations. Direct, induced and back flashovers are con-sidered. Over-voltages are computed using the ATP software package, distinguishing between tower, cen-tral conductor and lateral conductor lightning strokes. Conclusions are presented about the effectiveness of each protective scheme.
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Proceedings of the XIIIth International Symposium on High Voltage Engineering (ISH 2003), Johan J. Smit Editor, Millpress (ISBN: 90-77017-79 8), pp. 137. Delft, The Netherlands. August 25-29, 2003.
Published: August 2003.