How silicon gel sucks moisture in the transformer, its have
any small exaust fan behind silicon gel.

Answer Posted / raven

it is placed in long cylinder which is internally connected
to transformer.This gel absorbs any moisture preset in
transformer,it changes its color/state indicating it is time
to replace the gel with a new one.There is no fan present
near silicon gel as far as i know.I visited loco shed of
railways where there are huge transformers.
Well i hope this is correct. :)

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