452 



ELECTRICAL EQUIPMENT 



rinsing operation should be repeated several times, using fresh 

 liquid each time and draining the drums very thoroughly after 

 each rinsing. 



Operation. Artificially cooled transformers should not be run 

 continuously, even at no load, without the cooling medium. 



FIG. 284. 30,000-Volt Oil-testing Set. 



Therefore, it is essential to maintain a proper circulation of the 

 cooling system. 



If the water circulation of water-cooled transformers is for any 

 reason stopped, the load should be immediately reduced as much 

 as possible, and a close watch kept on the temperature. Reduce 

 the load if for any other reason the oil at the top, near the center 

 of the tank, approaches 80 C. This temperature should be rec- 



