CHAPTER III 



THE CORE LOSS AND Till. ANM U. r.rri. n:\. V. 



nay ii\v ]r.'ve<l with the estimation of the core loss of 



tin -JO-kw transformer wliich we are designing. The amount 



ore loss is an all-important feature of the design of a 



i it is often necessary to repeatedly alter the 



design until a satisfactory result is reached as regards this 



ire. 



mean length of the magnetic path may h,> ivadily , 

 lated or scaled off from a drawing -u. h as that in Fig. 86 

 (p. 58), showing tin dimensions of the core. In our example 

 th< in. an 1. ugth amounts to 



< (51 + 8,5) + 4X7 = 1 IT. 1 



The core has a section of 68,6 sq cm, and consequently tin 

 steel is 



8 x 117 = 9850m en. 



T steel weighs ap]>r\iuiat. 1\ 7,8 grams, and thu> 

 the total weight of the core amounts to 



0,0078 X 9350 = 73,0 



are now in a position to estimate the probable loss in the 

 of our t steresis iy losses, 



purpose we shall run 37), 



' In thi estimate, no allowance i -batoning of the mn 



path the corner*. Than mall factor of tafcty 



feofth of the magm-tic path (an ton* tletcn. 



