IHMKNSluNS OF A TRANSFORMER 53 



Loth have an advantage in the reduced pressure per layer. 



Tims if, in Fig- :W, the primary winding had con>isted of a 



running tlie full length of the core, instead of being 



dividrd up int.. eight component coils, the pressure betwmi 



turns of adjacent la yers would have been eight t 

 as j :.d consequently more insulation between layers 



w..iild have been ivqui 



H -JO-kva transformer i- t.. h.- proportional for a total 

 dr.-j . at full load of unity power factor. 1 



thi> am. -unt we arrange that some ],S per c< nt. shall constitute 

 t load, thru tin- coils can be so designed 

 tin- ind, . ..p will, for a load of unity power fa- 



:.-tal drop at rated load to over the stipulatrd 



2,0 per o nt. The eah-ulation of the inductive component of 



>tal drop i^ :-d in Chaptrr \ II. It is often desir- 



able to adhere to a certain value of the regulation in standard 



transformers, as it is customary to op. rate considerable 



numbers of them in parallel on tin- same secondary circuit, 



unless th. i-. filiation at rated load is the same in all of 



i, they will not share the load in propjrtion to their i 



us divide the 1,S per cent. / H drop equally 



the primary and .sre.mdary windings, though thi^ will 



> the best de ill ca^ s. Then the 



primary winding \\ill amount to (0,009 X 



6000 =) 45,0 volts, and that in the secondary winding to 



(0,009 X 200=) 1,80 volts. ! nary and .*. 



are res) l.l'J and 1<H) ami- 



must t i 



= io,a ohms, 



to 



= 0,018 ohm, 



1UU 



\\indin.Li i^ CI(M x r;i =) 



