CORE LOSS AND ANNUAL EFFICIENCY 68 



I h. iv>ults obtained in Table 6 are plotted in Fig. 87, an.l 

 it will be seen that I'.T a load factor of 20 per cent th- 

 ditlerence in annual efficiency of Transformer- A and 1; if 



ie 3 per cent., whereas when the load factor is increased 

 it. the difference is only some 1 percent. It U 



100 



factor /n //- Cent 



( Coiynr LO** 360 tfcte 

 \C6r, - /9O 



, 

 A " Transformer 



e - 36O - 

 Annual efficiencies of 20-kw transfornicnt at various loatl factors. 



'V'Yrr. that a liL-litiiiLT ' tOI as bi^h as 

 ut. or even :i(> |>.-r cent, is attained in pra 



Let US COlltilillr tlir r.i]M|ian-..|| 1 US- 



from abftsisof the oost of tin >. din. i ,. < > M 



i^suniptii'ii that tb.- ( 1. ctricit v supply \ 's total 



\\\\^ t.i 'i<i. p. ] ku b] i| M . 



