Treatments include:

Filtration: Removes solid particles using fine filters.
Degassing: Eliminates dissolved gases that can reduce dielectric strength.
Dehydration: Removes moisture through vacuum dehydration or adsorption methods.
Reconditioning: Restores oil properties using chemical additives or regeneration processes.
Oil Replacement: In cases of severe degradation, replacing the oil may be necessary.
These treatments restore the oil’s insulating and cooling properties, ensuring optimal cable performance.