Question

A transmission line conductor having a diameter of 19.5mm weights 0.85kg/m. The span is 275 meters. The wind pressure is 39 kg/m² of projected area with ice coating of 13mm. The ultimate strength of the conductor is 8000 kg. Calculate the maximum sag if the factor of safety is 2 and the ice weighs 910 kg/m³.

Answer 1

here initially few concepts are discussed briefly and then the numerical :

. Some important concepts here. * sag : B Conductor boyu Il colore Span is parabolic here. * When wind blows, weight per unit Length changes * Ice loading Acts on the conductor to change the conductor self weight. d=19.5 mm. ; weight = 0.85 kq 1m. awo 126=275m.] wind pressure: 39 kg / m?. span. sica contina t = 13mm) Ultimate Strength : 8000 Kg . PF =2 - Wice 29 Lokg 1m3 safety Factor Now, Total diameter = dtzt - 19.5 +13*2 = 4-55 cm.

projected free per unit wire length: ccxiom (4.55x16m x 1m = 4.55xlo mi wind loads 39ky Lux x 16²m²=1.775 Kg lm. Ice cross section Area :( n(xt) - arr) for nam -14 19.5 mm 12mo) * . (19 son) diagram - 1.327 xlo? m? Total ice hood: - Slokg/m2 7 13 27X103 m² - 1. 2076 Kg Im Сорок 7 of weight W- 1 (Wet Wice) + W wing 1 TO 35712von L a ww T 12.717/kgim a 10. Hoooks less = a Work ing max strougth ctwice " Safety factor - 1 and . Max sag is given by Wella 2L2 span in 2T Ls woking Stress . 2.717x/2² 2+ 40% sag = 6.42 m] Ans.