Electrical Cables
The disadvantage with paper as insulating material is

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

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Electrical Cables
Capacitance grading of cable implies

Grading according to capacitance of cables per km length
Capacitance required to be introduced at different lengths to counter the effect of inductance
Use of dielectrics of different permeabilities
Cables using single dielectric in different concentrations

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