Answer Posted / victor nyami

Transformer while in use succesive loading causes temperature variation of windings then oil as the transformer becomes heavily loaded thw temp of oil rises so there occurs a remarkable volume change due to expansion at this time a transformer breathes out when a load gets reduced the oil temp drops so it contracts at this time transformer breathes in.
As most of air have some moisture content so the breather trap the moisture so that the sucked aie becomes purely anhydrous 
Short circuit is avoided in that way and transfomermer oil properties remain unaltered

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