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The function of breather in transformer is
To provide oxygen to coil
To provide cooling air
To filter oil
To arrest flow of moisture
To arrest flow of moisture
The breather in a transformer is a device containing a dehydrating agent, typically silica gel, used to remove moisture from the air entering the conservator tank. As the transformer oil expands and contracts due to temperature fluctuations, air is drawn in or pushed out; the breather ensures that the incoming air is dry to prevent oil degradation and insulation failure.
The breather in a transformer is a device containing a dehydrating agent, typically silica gel, used to remove moisture from the air entering the conservator tank. As the transformer oil expands and contracts due to temperature fluctuations, air is drawn in or pushed out; the breather ensures that the incoming air is dry to prevent oil degradation and insulation failure.
VoilтАЛтИЭT
dtd╧БтАЛ┬а(moisture┬аcontent┬аreduction)
When the transformer load increases, the oil temperature rises and expands, pushing air out through the breather. Conversely, when the load decreases or the ambient temperature drops, the oil cools and contracts, drawing atmospheric air into the conservator. This incoming air passes through the silica gel, which adsorbs humidity, ensuring the dielectric strength of the insulating oil is maintained.
Silica gel crystals turn from blue (dry) to pink (moist) as they absorb water.
Prevents sludge formation and maintains the dielectric breakdown strength of the transformer oil.
Essential for conservator-type transformers.
Prevents internal oxidation of oil
Increases the lifespan of transformer insulation
Easy to maintain and replace silica gel
Requires regular monitoring of silica gel color
If the gel is saturated, it allows moisture to enter freely
Oil-filled power transformers
Distribution transformers with conservator tanks
Standard industrial practice is to replace or regenerate silica gel when the color changes significantly.
Option A is incorrect because oxygen accelerates oil degradation.
Option B is incorrect because cooling is primarily handled by radiators/cooling fins.
Option C is incorrect because oil filtration is handled by the Oil Purification/Filtration plant.
D is correct тАФ The breather contains silica gel to absorb moisture from the incoming atmospheric air, preventing contamination of the transformer oil.
Always remember that the breather is part of the conservator assembly, which is itself designed to provide free expansion/contraction space for the oil.