How does contamination affect cable oil and how can it be prevented?

Contamination impacts cable oil by:

Reducing Dielectric Strength: Water and particles lower the oil’s ability to insulate.
Increasing Electrical Losses: Impurities can create conductive paths, leading to leakage currents.
Accelerating Degradation: Contaminants promote oxidation and acid formation.
Corrosion: Water and acids can corrode metal components.
Prevention methods:

Sealing Systems: Ensure cable joints and terminations are properly sealed.
Desiccant Breathers: Use on oil reservoirs to prevent moisture ingress.
Regular Maintenance: Perform oil purification and system inspections.
Handling Practices: Use clean equipment and containers when sampling or adding oil.