108 TRANSMISSION LINE FORMULAS 



TABLE III. K FORMULAS FOR TRANSMISSION LINES. 

 CONDITIONS GIVEN AT RECEIVER END. 



Accurate within approximately ^ of i% of line voltage up to 100 miles, 

 and \ of i% up to 200 miles, for lines with regulation up to 20%. 



K = 6 (cycles^ tf= 2 .i6 for 60 cycles. K = 0.375 for 25 cycles. 

 10,000 



Conditions given: 



K.V.A. = K.V.A. at receiver end. 



E = Full load voltage at receiver end. 

 cos 6 = Power factor at receiver end. 

 K.W. = K.V.A. cos0. 



r = Resistance of conductor per mile. (From Tables VII-VIII.) 

 x = Reactance of conductor per mile. (From Tables IX-XII.) 

 / = Length of transmission line in miles. 



Then P = . . . cos _ j n _ p j iase curren t a t receiver end 



& 



(in total amps.). 



~ 1000 K.V.A. sin 9 



Q = - - - = Reactive current at receiver end 

 tk 



(in total amps.), when current is 



lagging. 



1000 K.V.A. sin 9 

 - -- - wnen current is leading. 



