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+//Example 10// Ch 5
+clc;
+clear;
+close;
+// given data
+m1=0.9;//smoothness coefficient
+m2=0.9;//weather coefficient
+r=3.175;//radius of conductor in cm
+V=525;//rated voltage in kV where no corona is present
+delta=1;//relative air-density factor
+Deq=112.63;//in cm
+E0=30*delta*(1+0.3/sqrt(delta*r))*m1*m2;//corona onset field
+printf("corona onset field %f kVpeak/cm",E0)
+E0rms=E0/sqrt(2);
+printf("rms corona onset field %f kV/cm",E0rms)
+V0=E0*r*log(Deq);
+printf("corona onset voltage %f kV",V0)
+V0ll=V0*sqrt(3);
+printf("corona onset voltage lin to line %f kV",V0ll)
+V1=2.5*V;//line to line voltage higher than V0 so corona is present on the conductor
+re=5;//effective radius of corona envelope in cm
+printf("envelope radius %f cm",re)
+
+
+
+