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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 4: OVERHEAD LINE INSULATORS
// EXAMPLE : 4.8 :
// Page number 187-188
clear ; clc ; close ; // Clear the work space and console
// Given data
n = 3.0 // Number of insulators
// Calculations
V_1 = 0.988 // Voltage across top unit as middle unit
V_3 = 1.362 // Voltage across bottom unit as middle unit
V_2 = 1/(V_1+1+V_3) // Voltage across middle unit as % of line voltage to earth
V1 = V_1*V_2*100 // Voltage across top unit as % of line voltage to earth
V2 = V_2*100 // Voltage across middle unit as % of line voltage to earth
V3 = V_3*V_2*100 // Voltage across bottom unit as % of line voltage to earth
eff = 100/(n*V3/100) // String efficiency(%)
// Results
disp("PART II - EXAMPLE : 4.8 : SOLUTION :-")
printf("\nCase(a): Voltage across top unit as a percentage of line voltage to earth, V_1 = %.2f percent", V1)
printf("\n Voltage across middle unit as a percentage of line voltage to earth, V_2 = %.2f percent", V2)
printf("\n Voltage across bottom unit as a percentage of line voltage to earth, V_3 = %.2f percent", V3)
printf("\nCase(b): String efficiency = %.2f percent", eff)
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