1- They are solid granules of a chemical substance derived from the basic material (sodium silicate) placed inside a cylindrical bottle.
2- A substance with a high capacity to absorb gases and water vapor
3- Silica gel is considered one of the most important drying agents in transformers.
- Because it is used to protect transformer oil from the harmful effects of moisture.
4- Since it acts as a filter that absorbs impurities and dust from the air during the expansion and contraction of the oil.
5- The color of silica gel varies between blue, black, white, and pink, which indicates its operational status.
6- It should be changed periodically as its color indicates the need for replacement.
- The black color indicates that the material is saturated with oil vapor, so it must be changed and cannot be reused again.
source : bayt