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// A Texbook on POWER SYSTEM ENGINEERING
// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
// DHANPAT RAI & Co.
// SECOND EDITION
// PART II : TRANSMISSION AND DISTRIBUTION
// CHAPTER 5: MECHANICAL DESIGN OF OVERHEAD LINES
// EXAMPLE : 5.4 :
// Page number 199
clear ; clc ; close ; // Clear the work space and console
// Given data
a = 110.0 // Cross-sectional area(sq.mm)
w_c = 844.0/1000 // Weight of conductor(kg/m)
U = 7950.0 // Ultimate strength(kg)
L = 300.0 // Span(m)
s = 2.0 // Factor of safety
wind = 75.0 // Wind pressure(kg/m^2)
h = 7.0 // Ground clearance(m)
d = 2.79 // Diameter of copper(mm)
n = 7.0 // Number of strands
// Calculations
dia = n*d // Diameter of conductor(mm)
w_w = wind*dia/1000.0 // Horizontal wind force(kg)
w = (w_c**2+w_w**2)**0.5 // Resultant force(kg)
T = U/2.0 // Allowable tension(m)
l = L/2.0 // Half-span(m)
D = w*l**2/(2*T) // Distance(m)
height = h+D // Height above ground at which the conductors should be supported(m)
// Results
disp("PART II - EXAMPLE : 5.4 : SOLUTION :-")
printf("\nHeight above ground at which the conductors should be supported = %.2f metres", height)
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