CURRENT-LIMITING REACTORS 



463 



would reduce the power-factor to about 66 per cent and a 4.2 per 

 cent reactor to 65.5 per cent. 



Effect of Reactance on Regulation. As in the case of the power- 

 factor, an increase in the reactance results in a slightly poorer 

 regulation, the effect being more marked if the operating power- 

 factor is much below unity. The curves in Fig. 287 show the vari- 

 ation in regulation with per cent reactance, and it will be noted 



5 

 Per Cent Reactance of Circuit 



FIG. 287. 



10 



that with a 90 per cent power-factor the introduction of a 3 per 

 cent reactor will increase the regulation 1.6 per cent and a 4,2 

 per cent reactor 1.9 per cent. With a power-factor of 70 per cent 

 the increase in the regulation would be respectively 2.5 and 3.0 

 per cent. However, the amount by which the voltage of the 

 system is lowered is not seriously large and can readily be com- 

 pensated for by increasing the voltage of the generators. 



