Electrical Cables
Cables for 220 kV lines are invariably

Mica insulated
Rubber insulated
Compressed oil or compressed gas insulated
Paper insulated

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

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

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