What is the process of cable oil filtering and why is it necessary?

The filtering process involves passing the oil through filters that remove solid particles and impurities. Steps include:

Pre-Filtration: Removes larger particles using coarse filters.
Fine Filtration: Captures smaller particles with fine filters.
Monitoring: Pressure differentials indicate when filters need replacement.
Filtering is necessary because solid contaminants can reduce dielectric strength, cause abrasion within the system, and accelerate oil degradation. Maintaining oil cleanliness ensures effective insulation and prolongs equipment life.