Transformer cooling
a- internal cooling medium
O : Oil
L : Insulating liquid ( nonflammable )
b- external coolind medium
A : air
W : water
c- type of circulation
N : natural
F : forced
d- designation and order of symbols
1st letter : internal cooling medium
2nd letter : type of circulation
3rd letter : external coolind medium
4th letter : type of circulation
e- standard type designations
the standard types of transformers with their designation shall be as follow :
oil-immersed natural cooling ONAN
oil-immersed water cooling ONWN
oil-immersed forced-air cooling ONAF
oil-immersed forced-oil water cooling OFWN
oil-immersed forced-oil forced-air cooling OFAF
oil-immersed forced-oil natural cooling OFAF
nonflammable liquid-immesed natural cooling LNAN
nonflammable liquid-immesed water cooling LNWN
nonflammable liquid-immesed forced-air cooling LNAF
nonflammable liquid-immesed forced-liquid water cooling
nonflammable liquid-immesed forced-liquid forced coolling
nonflammable liquid-immesed forced-liquid natural coolling
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ردحذفAir Cooled Transformer