52 TRANSMISSION LINE FORMULAS 



Ans. (a) 69,670 volts, (b) 48,950 volts, (c) 20,720 volts, (d) 

 96.59 amps., (e) 92.35%, (/) 2440 Kw., (g) 86.90%, (h) 

 90.97 amps., (i) 6.47%, (/) 860 Kw. 



6. Find, by the convergent series, the voltage at the supply end 

 of the following line: 



Total length of line 400 miles. 



Spacing 15 feet. 



Conductor '. No. oooo copper cable. 



Load at receiver end of line, 5000 K.V.A., 85% P.F. (lagging), 



110,000 volts, three phase, 60 cycles. 



Load taken by a substation at the middle of the line, 200 miles 

 from either end, 2500 K.V.A. at the line voltage and at 90% P.F. 

 (lagging). (Prob. 7, Chap. V.) 



Ans. 90,190 volts. 



