Why is cable oil purification important for the longevity of high-voltage cables?

Cable oil purification is crucial because contaminants like moisture, gases, and particulate matter can degrade the oil’s insulating properties. Impurities can lead to reduced dielectric strength, increased electrical losses, and the formation of conductive paths that may cause electrical failures or breakdowns. Regular purification removes these contaminants, maintaining the oil’s quality and ensuring the reliability and longevity of high-voltage cables.