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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 : 4.1 :
+// Page number 183
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+V_1 = 9.0       // Potential across top unit(kV)
+V_2 = 11.0      // Potential across middle unit(kV)
+n = 3.0         // Number of disc insulators
+
+// Calculations
+// Case(a)
+K = (V_2-V_1)/V_1         // Ratio of capacitance b/w pin & earth to self capacitance
+// Case(b)
+V_3 = V_2+(V_1+V_2)*K     // Potential across bottom unit(kV)
+V = V_1+V_2+V_3           // Voltage between line and earth(kV)
+V_l = 3**0.5*V            // Line voltage(kV)
+// Case(c)
+eff = V/(n*V_3)*100       // String efficiency(%)
+
+// Results
+disp("PART II - EXAMPLE : 4.1 : SOLUTION :-")
+printf("\nCase(a): Ratio of capacitance b/w pin & earth to self-capacitance of each unit, K = %.2f ", K)
+printf("\nCase(b): Line voltage = %.2f kV", V_l)
+printf("\nCase(c): String efficiency = %.f percent", eff)