Xcos examples from textbooks and for blocksHEADmaster

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diff --git a/Working_Examples/83/CH5/EX5.2/example_5_2.sce b/Working_Examples/83/CH5/EX5.2/example_5_2.sce
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+//Chapter 5
+//Example 5.2
+//page 134
+//To find voltage at the bus at the power station end
+clc;clear;
+
+base_MVA=5;
+base_kV=33;
+pf=0.85;
+cable_impedance=(8+%i*2.5);
+cable_impedance=cable_impedance*base_MVA/(base_kV^2);
+
+transf_imp_star=(0.06+%i*0.36)/3; //equivalent star impedance of winding of the transformer
+Zt=(transf_imp_star*5/(6.6^2))+((0.5+%i*3.75)*5/(33^2));
+total=cable_impedance+2*Zt;
+
+load_MVA=1;
+load_voltage=6/6.6;
+load_current=1/load_voltage;
+
+Vs=load_voltage+load_current*(real(total)*pf+imag(total)*sin(acos(pf)));
+Vs=Vs*6.6;
+printf('\n\nCable impedance= (%0.3f+j%0.4f) pu\n',real(cable_impedance),imag(cable_impedance));
+printf('\nEquivalent star impedance of 6.6kV winding of the transformer =(%0.2f+j%0.2f) pu\n',real(transf_imp_star),imag(transf_imp_star));
+printf('\nPer unit transformer impedance,Zt=(%0.4f+j%0.3f) pu\n',real(Zt),imag(Zt));
+printf('\nTotal series impedance=(%0.3f+j%0.3f) pu\n',real(total),imag(total));
+printf('\nSending end Voltage =|Vs|=%0.2fkV (line-to-line)',Vs);
+