TRANSMISSION OF POWER BY ALTERNATING CURRENT 393 



4/2-18.1 

 t 



if 144.4 



As only one-half tho line capacitance is assumed at the receiving end, the 



Jim current flowing over the line, /-- 2 .'M.i? 2 = 18.1 amp. 

 In onlrr to find the total line current, however, this 1S.1 amp. must be 

 added \ , 'tonally to the ISO. 5 amp. of load-eunent. Therefore, Fig. 356, 



the load current 10 reeolved into an energy component I cos 6 = ii = 180.5 X 



0.8 = 144.4 amp., and a quadrature com- 

 ponent / sin $ = it = 180.5 X 0.6 = 108.3 

 amp. 



As the quadrature component, 108.3 

 amp., lags the load voltage by 90 and 

 the rhargirm current, 18.1 amp., leads the 

 load voltage by {K), the resulting quad- 

 rature component is 



t' = 108.3 - 18.1 = 90.2 amp. 

 The total line current 



/e/2-18.1 



Fro. 350. Effort of lino charging 

 current on total line current. 



/' = \/(144.4) J + (<.M).2) 2 = 170 amp. 

 The voltage at the sending end 



E = V (69,300 X 0.8 + 170 X 26.4) + (69,300 X 0.6 + 170 X 81.0) ' 

 = V (3,590 + 3,060) X 10 = 81,500 volts. 



81,500 - 69,300 12,200 

 (a) Line regulation - |(() ,. ;{()() or 1 -.6 per cent. Ana. 



(6) The total line loss 



. /" = 3 X (170) 8 X 2t. 1 J.-".M) kw. Ana. 

 The total K'nerator power 



= 30,000 + 2,290 = 32,-J'.H) kw. A us. 



166. Corona. -Fimire :>.")7 show> a tapered conductor whose 

 diameter at the large end is about a half-inch. This conductor 

 taper- madually to a point. It is su>prnded vertically in ail- 

 wit h its tip about 18 in. from a conduct inu -beet <>r plate, which 

 umled. Tho secondary terminals of a hiib-voltauc trans- 

 former are connected, the one to the tapered conductor and the 



other to the plate. 



Alow \< tirst applied to the transformer and the vol 



is then m-adually increased. When the >econlary voltage i> in 

 the neiii-bltni-hnnd f from ii.OOO to 4,000 volts, a blui.-h (li-char^e 

 oeeiirs from the pointed tip of the conductor. This may be 

 plainly Been if the room U- darkened. A> the voltage i- increased, 

 the l,liii>h di- OHM further up <>n the conduetnr and sur- 



round- it in I ling. When the voltage reaehcs the neiuhhorhood 



