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+//Electric Power Generation, Transmission and Distribution by S.N.Singh

+//Publisher:PHI Learning Private Limited

+//Year: 2012 ; Edition - 2 

+//Example 12.1

+//Scilab Version : 6.0.0    ; OS : Windows

+

+clc;

+clear;

+

+

+V=33;                                  //Operating voltage of line in kV

+m=10;                                  //Mutual capacitance of unit

+n=4;                                   //No of string units 

+V_tot=V/3^(1/2);                       //Total voltage across the string in kV

+V1=V_tot/(1+1.1+1.31+1.651);           //Voltage across the topmost unit in kV

+V2=V1*(1+(1/m));                       //Voltage across the second unit from the top in kV

+V3=V1*(1+(3/m)+(1/m^(2)));             //Voltage across the third unit from the top in kV

+V4=V3*(1+(1/m))+(V2/m)+(V1/m);         //Voltage across the fourth unit from the top in kV

+str_eff=V_tot/(n*V4);                  //String efficiency in percentage

+

+

+printf("\nThe string efficiency is %.2f percentage",str_eff*100);