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+//Example 10// Ch 5
+clc;
+clear;
+close;
+// given data
+m1=0.92;//smoothness coefficient
+m2=0.95;//weather coefficient
+Deq=600;//mean geometric distance b/w conductors in cm
+V = 275;//line operating at voltage V in kV
+p=75;//pressure in cm Hg
+t = 35;//in degree C
+r=1;//radius of conductors in cm
+delta=3.92*p/(273+t);//relative air density
+printf("relative air density %f",delta)
+E0=30*delta*(1+0.3/sqrt(delta*r))*m1*m2;//corona onset field
+printf("corona onset field %f kVpeak/cm",E0)
+V0 = E0*log(Deq);//onset voltage in kVpeak
+printf("onset voltage %f kVpeak",V0)
+V0rms=V0/sqrt(2);//rms onset voltage
+printf("rms onset voltage %f kV",V0rms)
+V0ll=V0rms*sqrt(3);//onset voltage line to line
+printf("line to line onset voltage %f kV line to line",V0ll)
+K= 0.05;
+f=50;//in Hz
+Vph=(V*10^3)/sqrt(3);
+Pc=3.73*K*f*(Vph^2)*10^-5/(Deq/r)^2;
+printf("corona power loss %f kW/(cond.km)",Pc)
+Ic=Pc/Vph;
+printf("corona current %e A/km",Ic)