Electrical Cables
The disadvantage with paper as insulating material is

None of the listed here
It has high capacitance
It is hygroscopic
It is an organic material

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

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

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