Electrical Cables
The advantage of oil filled cables is

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

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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
Insulation may melt due to higher temperature
Skin effect dominates on the conductor
Of corona loss between conductor and sheath material

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