Electrical Cables
In the cables, the location of fault is usually found out by comparing

All of the listed here
The inductance of conductors
The capacitances of insulated conductors
The resistance of the conductor

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

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

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