THE REGULATION OF TRANSFORMERS 111 



secondary. The first part of this chapter dealt with nun::. 

 leakage, and it was shown that for close regulation the primary 

 ami secondary coils must be close 



;li-r and intermixed. If, 



, the pressure on one 



of the three- wire system is 



provided hy a secondary coil on 



one leg, and tin- pressure on the 



oth-r side hy a secondary coil on 



tlie other leg, and if only one of 



these coils he loaded, there will 



be a large leakage flux caused 



hy the ampere turns of that part 



he primary winding which 

 is wound on that h-g whose 



''.'.. Arrangement of 

 in o.re-tvpe ti:in>f.Tim-r for 

 three- wire secoi; 



iMQQQQQOQ 



secondary is unloaded. For full load' on one side and no 

 1 ad on the other side of the three-win lyrtem, this may easily 

 result in a rise of as 

 much as 25 per cent. 

 in the pressure on the 

 8, and a 



of 25 per cent, in 

 the pressure on Un- 

 loaded side, ni;t 

 th-- pressure across the 

 i side greatly 

 exceed that on tin- 

 loaded side. This was 

 first pointed out and 

 investigated hy Mr. 



S. Moody. Th. 

 inequality in the mag- 



leakage may be prevented by adopting connections 



(originally suggested hy M -.hid, distribute both 



he secondary \\n ; lie two legs. 



oils in cor. 



tr.m-f..Mn.T for ihirr-win- MOOOduy, 



