174 THE DESIGN OF STATIC TRANSFORMERS 



is important that the damaged oil shall not gain access to any 

 of the other transformers. 



Wliile for a time, considerable attention was given to forced- 

 oil-cooled transformers, and the plan was adopted on several 

 installations, it has often been found that the extra cost of 

 the auxiliary plant required, largely offsets any advantages, 

 and the present tendency in large transformers is toward the 

 employment of oil-immersed transformers with water cooling 

 by means of coils of piping within the transformer through 

 which the water circulates. Nevertheless the oil-circulating 

 proposition affords a sound and appropriate solution in many 

 instances. 



PROPERTY OF ELECTRICAL ORY, 



FACULTY OF APPLIED SCIcNCE. 



Date., 



BKADBUKV, ACNKW, \ CO, !.!>., I'ltlNTKKS, LONDON AND TONB1UDOE. 



