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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 : 4.7 :
// Page number 186-187
clear ; clc ; close ; // Clear the work space and console
// Given data
n = 3.0 // Number of insulators
C_1 = 0.2 // Capacitance in terms of C
C_2 = 0.1 // Capacitance in terms of C
// Calculations
// Without guard ring
e_2_a = 13.0/13.3 // Potential across middle unit as top unit
e_1_a = 8.3/6.5*e_2_a // Potential across bottom unit
E_a = 1+(1/(8.3/6.5))+(1/e_1_a) // Voltage in terms of e_1
eff_a = E_a/n*100 // String efficiency(%)
e1_a = 1/E_a // Voltage across bottom unit as a % of line voltage
e2_a = 1/(8.3/6.5)*e1_a // Voltage across middle unit as a % of line voltage
e3_a = 1/e_1_a*e1_a // Voltage across top unit as a % of line voltage
// With guard ring
e_2_b = 15.4/15.5 // Potential across middle unit as top unit
e_1_b = 8.3/7.7*e_2_b // Potential across bottom unit
E_b = 1+(1/(8.3/7.7))+(1/e_1_b) // Voltage in terms of e_1
eff_b = E_b/n*100 // String efficiency(%)
e1_b = 1/E_b // Voltage across bottom unit as a % of line voltage
e2_b = 1/(8.3/7.7)*e1_b // Voltage across middle unit as a % of line voltage
e3_b = 1/e_1_b*e1_b // Voltage across top unit as a % of line voltage
// Results
disp("PART II - EXAMPLE : 4.7 : SOLUTION :-")
printf("\nWithout guard ring:")
printf("\n Voltage across bottom unit, e_1 = %.2f*E", e1_a)
printf("\n Voltage across bottom unit, e_2 = %.2f*E", e2_a)
printf("\n Voltage across bottom unit, e_3 = %.2f*E", e3_a)
printf("\n String efficiency = %.1f percent \n", eff_a)
printf("\nWith guard ring:")
printf("\n Voltage across bottom unit, e_1 = %.2f*E", e1_b)
printf("\n Voltage across bottom unit, e_2 = %.2f*E", e2_b)
printf("\n Voltage across bottom unit, e_3 = %.3f*E", e3_b)
printf("\n String efficiency = %.2f percent", eff_b)
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