: THE SYNCHRONOUS CONVERTER 355 



TABLE 144. KFFKITT OF NUMBER OF PHASKS AND OF P\VKH- 



FAOTOR ON THE OUTPUT OF A SYNCHRONOUS CONVERTER 



No. OF 



1 



D. C. 

 3 

 4 

 6 

 12 



F.-l.O 



0.85 

 1.00 



1.93 

 2.18 



P. F.-0.9 



0.74 

 1.00 

 1.09 

 1.28 

 1.45 

 1.58 



The considerable gain in rating obtained by operating a con- 

 verter six-phase is the reason that six-phase converters are so com- 



| ^K^^^^ 



(a) D.C. and A.C, Currents In Conductor b P.P = 0.71 



! I 



(b) RciultantC 



:,t in r, , mlncf, >r at -li|f-nnR tap. 



nionly \i^-<\. The julvMiitMuv <>!' the LiMi'ii (il'i:iiri'<| by oponiting 



t\ve|vr-ph;iH' i- iisiijil! 'V the added \vinim c(.niplic:i t inns. 



145. Effect of Power-factor on Converter Rating.-- The mting 



and elfin'. deerMH much more rapidly with 



