TABLE II 



Formulas for Short Constant- Voltage Lines 

 Conditions Given at Supply End 



These formulas are exact when the line is short. 

 When the line is 20 miles long, they are correct within 

 approximately * / 10 of i per cent of line voltage. 



Conditions Given: 



E = Voltage at receiver end. 

 E a = Voltage at supply end. 

 R = Resistance of one conductor. 

 X = Reactance of one conductor. 



(See Tables VII-XII, "Transmission Line For- 

 mulas.") 

 Pg = Current at the supply end in phase with E 8 , in 



total amperes. 



(i) Circle Diagram. 



Describe a circle with centre (a, b) and radius c, where 

 i E 8 2 R 



6= - 



and c = + 



looo R 2 + X 2 

 i E 2 X 



looo R 2 + X 2 

 i EE 8 



1000 



The ordinates to this circle represent the reactive Kva., 



& ft 



- , at the generators. 



95 



