Electrical Cables
The breakdown voltage of a cable depends on

Presence of moisture
Working temperature
All of the listed here
Time of application of the voltage

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Electrical Cables
Capacitance grading of cable implies

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

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