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+// chapter 13

+// example 13.6

+// Design a suitable selenium voltage protection circuit and compute energy dissipated per plate

+// page-814

+clear;

+clc;

+// given

+Edc=440; // in V

+Imax=120; // in A

+R=0.175; // in ohm

+T=25; // in ms (time constant)

+V=40; // in V

+// calculate

+T=T*1E-3; // changing unit from ms to s

+n=Edc/V; // calculation of number of plates in each branch

+N=3*n; // calculation of total number of plates

+L=T*R; // calculation of armature circuit inductance

+E_stored=(1/2)*L*Imax^2; // calculation of energy stored in armature

+E_dissipated=E_stored/11; // calculation of energy dissipated per plate

+printf("\nThe number of plates in each branch is \t n=%.f",n);

+printf("\nThe total number of plates is \t N=%.f",N);

+printf("\nThe armature circuit inductance is \t L=%.2f mH",L*1E3);

+printf("\nThe energy stored in armature is \t E_stored=%.1f W",E_stored);

+printf("\nThe energy dissipated per plate is \t E_dissipated=%.2f W",E_dissipated);

+// Note : The value of time constant given in the book is 25 ms but in calculation the author has used 30 ms. Thats why answers in the book are wrong
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