The gel used in breather of the transformer is

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ALP CBT 2 Electrician Previous Paper: Held on 23 Jan 2019 Shift 1

Answer 1

Silica gel is used to absorb moisture and prevent entering the oil tank while breathing. It is used in an oil transformer breather.
The Colour of fresh silica gel is blue. The moist silica gel became pink in color.
A transformer consists of Breather, Conservator and Buchholz relay, etc.
The breather is used in the transformer to filter out the moisture from the air. Breather consists of silica gel which absorbs moisture from the air.
Conservator tank present at the top of the transformer which allows adequate space for expansion of oil. Therefore during an overloading condition, the oil moves to the conservator tank.
Buchholz relay is used for the protection of transformers from the faults occurring inside the transformer.
Whenever the transformer is loaded, the temperature of the transformer insulating oil increases. Consequently, the volume of oil is increased.
As the volume of the oil is increased, the air above the oil level in conservator will come out. At low oil temperature, the volume of the oil is decreased, causes air to enter into a conservator tank.
The air consists of moisture in it and this moisture can be mixed up with oil. Hence to filter the air from a moisture silica gel breather is used.