REACTANCE OF TWO-PHASE AND THREE-PHASE LINES 83 



Thus the total reactive drop is equal to 



^-jj '-(So.s + 74i.ilog-J27r/X iQ- 6 

 K.V.A. , 



where x is the tabulated value of reactance. 



Reactance, Three-phase, Regular Spacing. When the 

 conductors are spaced at the corners of an equilateral tri- 

 angle of side s, then the expression for reactance is the 

 same as the usual formula: 



x = (80.5 + 741-1 logio-J 2 TT/ X iQ- 6 . 



Reactance, Three-phase, Flat Spacing. When the three 

 conductors lie in one plane (either 



horizontal or vertical), the center j ? 



one being equidistant from the !* a --.--4 --a $ 

 other two, as in Fig. 18, the react- F ig. 18. 



ance per mile is 



80.5 + 741.1 log g ^ lXlX2 

 P 



, 1.26^ 

 = 80.5 + 741. i log . 



P 



This is approximately 4% higher in an ordinary case 

 than the reactance for spacing on an equilateral triangle 

 of side a. 



The formulas of this chapter will apply to cable as well 

 as to wire, if the term 80.5 is changed as per Chapter XI. 



