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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 III : SWITCHGEAR AND PROTECTION

+// CHAPTER 9: PROTECTION OF TRANSFORMERS

+

+// EXAMPLE : 9.3 :

+// Page number 636

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+V_lv = 11.0*10**3       // LV side voltage of transformer(V)

+V_hv = 66.0*10**3       // HV side voltage of transformer(V)

+ratio_CT = 250.0/5      // CT ratio on LV side of transformer

+

+// Calculations

+V_hv_phase = V_hv/3**0.5          // HV side phase voltage(V)

+ratio_main_T = V_hv_phase/V_lv    // Ratio of main transformer

+I_2 = 250.0                       // Primary CT

+I_1 = I_2/(ratio_main_T*3**0.5)   // Primary line current(A)

+CT_sec = 5.0                      // Secondary CT

+secondary_side = CT_sec/3**0.5    // HV side CT secondary

+

+// Results

+disp("PART III - EXAMPLE : 9.3 : SOLUTION :-")

+printf("\nRatio of CTs on high voltage side = %.1f : %.1f = (%.f/%.2f√3) : (%.f/√3) ", I_1,secondary_side,I_2,ratio_main_T,CT_sec)