Overvoltage events may cause the electric field to exceed the dielectric strength of air and result in the formation of an plasma of the arc.
22.
For instance, the dielectric strength of silicon dioxide films of a few hundred nm to a few ?m thick is approximately 0.5GV / m.
23.
It must therefore have high dielectric strength, thermal conductivity, and chemical stability, and must keep these properties when held at high temperatures for extended periods.
24.
They occur when the electric field at the conductor exceeds the dielectric strength of the air, the " disruptive potential gradient ", roughly 30 kilovolts per centimeter.
25.
Impurities, tiny mechanical damages, or imperfections in the dielectric can affect the structure, changing it from amorphous to crystalline structure and thus lowering the dielectric strength.
26.
The dielectric films, depending on the desired dielectric strength, are drawn in a special process to an extremely thin thickness, and are then provided with electrodes.
27.
Plastic film capacitors were significantly smaller in physical size ( better volumetric efficiency ), with the same capacitance value and the same dielectric strength as comparable paper capacitors.
28.
Because of the smaller relative permittivity and lower dielectric strength of the PEN polymer, PEN film capacitors are physically larger for a given capacitance and rated voltage value.
29.
Because dielectric materials usually contain minute defects, the practical dielectric strength will be a fraction of the intrinsic dielectric strength of an ideal, defect-free, material.
30.
Because dielectric materials usually contain minute defects, the practical dielectric strength will be a fraction of the intrinsic dielectric strength of an ideal, defect-free, material.
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