حساسیت شکست محافظ رعد و برق خط انتقال دو مداره بر روی ساختارهای هندسی برج

A numerical calculation method based on the leader propagation model of lightning is proceeded to investigate the effect of overhead line tower geometric constructions to the lightning shielding failure. In this paper, the height and the spacing of the ground wire were changed to study the sensitivity of the shielding effectiveness on tower constructions. As the conclusion, an efficient layout scheme of ground wire and phase wire was proposed. Even if the protecting angle of the ground wire keeps unchanged, if the height of the ground wire is various, the total shielding failure rate is totally different, so we should take into account other factors except for the protection angle during the design of tower structure. This paper compared the total trip out rate of four types of double-circuit towers and concluded that the concave drum-type tower is the best design.