THE REGULATION ol- TRANSFORMERS 97 



hiu'her the imluctance of a transformer, the greater \\ill 

 be the pressure which will be required at the primary terminals 

 to send a given current through the -, -condary winding when 



Ler is short-circuited* ('on-ider a 100-kw tra: 

 wound for 3000 primary volts and 200 s y volts. The 



> of transformation is ^ ^ =J 15. Its secondary current, 

 at its rated load of 100 kw, is (for unity i ctor) 



equal to ( 1 ^p ) =) 500 amperes. If the secondary 



1 through an ammeter, and if tin- pressure at the 

 primary terminal-* is gradually raided, it asonably 



goo.i . it may 1.,- found that it will iv.juiiv a piv>siire of, 



say, 100 volts at tin- primary t.nmi llict'ull- 



uit. .1 -,, Hidary. 



corresponding primary ciirn-nt is ( '' j 88,3 amperes. 



iance" of tli- rmer m. 



may be said to be ( oo o =) 3 3 ohm-. I h. iinp-daiice is 



mad.- up "t'tu.. r.'iiijH, units, the resistant-.- and tin- n :. 



As reasonable values for the resistances of tin- primary and 



Beco; .udin-js ,f this l(K)-kw tran->i'. .I'm 



0,60 "Inn and 0,0020 ohm n-sprctivi-ly. It is convenici 



;il> illations to ri-dutv tin- da: 



an ' r, hut \\ith a 1:1 ratio !' fcri 



M. Thus ,.iii icii-lvw transf' '<)<) prin. 



200 secondary volts ind 1 . 



'.van "equivalent loo k\\. but 



with b,th primary and secondary coils wound lor :1<M)0 volts. 

 " -pii\ ier we should >till hav- the 



resistance of the pi ! to 0,60 ohm as 



>|<Unoe and reacUncc arc dealt with in I ,-al mann.-r in 



treaUM by the author, entitle- i 



M- M, QMtaUt I !,!.,:,. 



H 



