The voltage below which the dielectric material remain stable in its property but above which it result in distraction of insulating properties is called "Breaking voltage".
Factor affecting breakdown Voltage :
A) Thickness of material
B) Temperature
C) Moisture Constant
D) Time for application of voltage.
Breakdown Strength :
The maximum dielectric stress which the material can withstand.
It is a corresponding voltage at which the insulator starts losing it's dielectric properties and current starts increasing to high value unless controlled by the external impedance of circuit.
Factor affecting breakdown Strength :
1) Temperature is inversely proportional to breakdown Strength.
2) Presence of air and gas decrease the dielectric strength.
3) As frequency increases the voltage hence breakdown Strength decrease.
4) Thickness is directly proportional to breakdown Voltage and directly proportional to breakdown Strength.
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