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Which gel ensures the dryness of the incoming air in the breather?
Potassium gel
silica gel
Carbon gel
All of these
silica gel
Silica gel is used in the breather of an oil-immersed transformer to prevent moisture from entering the transformer tank as the oil level fluctuates due to temperature variations. When the transformer oil cools and contracts, air is sucked in through the breather; the silica gel absorbs the atmospheric moisture, ensuring that the incoming air remains dry and preventing the degradation of transformer oil dielectric strength.
Silica gel is used in the breather of an oil-immersed transformer to prevent moisture from entering the transformer tank as the oil level fluctuates due to temperature variations. When the transformer oil cools and contracts, air is sucked in through the breather; the silica gel absorbs the atmospheric moisture, ensuring that the incoming air remains dry and preventing the degradation of transformer oil dielectric strength.
H2тАЛO(vapour)+SiO2тАЛтЖТSiO2тАЛтЛЕnH2тАЛO тАФ Adsorption process represented as moisture capture by silica dioxide
Silica gel consists of porous granules of silicon dioxide. It acts as a desiccant by adsorbing water molecules onto its large surface area. As it absorbs moisture, the color of the crystals changes from blue (anhydrous) to pink (hydrated), serving as a visual indicator for maintenance teams to replace or reactivate the gel.
Silica gel maintains the dielectric strength of the transformer insulating oil.
The color change (Blue to Pink) indicates the saturation level of the desiccant.
Regeneration can be achieved by heating the saturated gel to approximately 120┬░C.
Moisture is the primary enemy of transformer insulation, leading to breakdown and flashovers.
Highly effective at low humidity levels.
Simple, low-cost maintenance through visual inspection.
Requires periodic monitoring and replacement.
Can become ineffective if the transformer is not sealed properly.
Breathers for oil-filled power transformers.
Instrument transformers and conservator tanks.
Blue silica gel contains Cobalt Chloride, which is toxic; modern variants often use 'Orange' silica gel (Methyl Violet) which is environmentally safer.
Option A (Potassium gel) and Option C (Carbon gel) are not standard desiccants used in transformer breather applications.
B is correct тАФ Silica gel is the chemical desiccant used in transformer breathers to prevent atmospheric moisture from contaminating the transformer oil.
In competitive exams, always link 'Breather' with 'Silica Gel' and 'Conservator Tank' with 'Oil Expansion', as these components work together in the transformer cooling and insulation system.