Electrical Cables
The advantage of oil filled cables is

All of the listed here
More perfect impregnation
Smaller overall size
No ionization, oxidation and formation of voids

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Electrical Cables
Solid type cables are considered unreliable beyond 66 kV because

There is a danger of breakdown of insulation due to the presence of voids
Skin effect dominates on the conductor
Of corona loss between conductor and sheath material
Insulation may melt due to higher temperature

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