Electrical Cables
The advantage of oil filled cables is

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

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Electrical Cables
Capacitance grading of cable implies

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

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