Why Silica Gel Used In Transformer:
Have you observed any time What is the blue color attached to the Transformer? It is called Silica Gel Sometimes you can also see it in pink color. When the temperature of the oil increases the oil in the conservator tank will increases it also releases air to the environment.
When the temperature decreases oil level in the transformer will decrease. It causes oil levels in the conservator tank to also decrease. The air from the environment is trying to enter the transformer tank. The natural air consists of moisture in some conditions. So, it is trying to mix with the transformer oil.
The silica gel component is attached to the breather pipe which is connected to the conservator tank. Silica gel is a good moisture absorber component. The silica gel is in the form of crystals form.
Color Change Of Silica Gel:
Firstly the silica gel is in blue color. After absorbing moisture from the environment it is changed to a Blue color. The dry air is entered into the transformer due of the moisture is absorbed by the silica gel.