Silica gel
is a granular ,vitreous ,porous form of silicon dioxide made synthetically from
sodium silicate. Silica gel is though and hard.
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| silica gel |
use:
A silica
gel breather is the most commonly used
way of filtering air from moisture .
silica gel breather for transformer is connected with conservator tank means of
breather pipe . breather absorb the moisture
in the air sucked in by the transformer during the breathing process.
BREATHING PROCESS IN TRANSFORMER
When
load on transformer increases or when the transformer under full load, the
insulating oil of the transformer gets heated up, expands and gets expel out in
to the conservator tank present at the top of the power transformer and
subsequently pushes the dry air out of the conservator tank through the silica
gel breather. This process is called breathing out of the transformer.
When the
oil cools down, air from the atmosphere is drawn in to the transformer. This is
called breathing in of the transformer.
 |
| silica gel in breather -when installed |
During the
breathing process ,the incoming air may consist of moisture and dirt which
should be removed in order to prevent any damage. Hence the air is made to pass
through the silica gel breather , which will absorb the moisture in the air and
ensures that only dry air enters in to the transformer.
Silica gel
in the breather will be in blue colour
when it absorbs moisture for long time it turns to pink colour indicates that it must be replaced.
 |
| silica gel -pink colour indicates that it must be replaced |
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