Transformer oil and gear oil both serve as lubricants and coolants in their respective systems and require high purity to function effectively. Both can become contaminated with particles, moisture, and degradation products. Filtration methods are similar, involving:

Mechanical Filtration: Removing solid particles.
Vacuum Dehydration: Eliminating moisture and gases.
Adsorption Techniques: Using materials to absorb dissolved contaminants.
Maintaining oil purity in both cases is essential for preventing equipment failure and ensuring efficient operation.