High Voltage Technique U=400 kV was applied to the oil-insulated (Ɛroil=2.5) coaxial cylindrical electrode system with inner radius r1=10 cm and outer radius R=20 cm. a) Calculate the maximum field strength. b) In order to reduce the maximum field strength in the oil layer, if the inner electrode surface is coated with a solid insulating material with a thickness of 1 cm and relative dielectric constant Ɛr=4, what will be the maximum field strength in the remaining oil layer? c) Calculate the required solid insulating material thickness in order to reduce the maximum area strength in the oil layer to 88% of the value calculated in a.

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Dielectric Breakdown

A dielectric is a material with low electrical conductivity and so is classified as an insulator. Dielectric materials are used to block the flow of electricity through them, allowing them to behave as an insulators. They can also be used to store electric charge or improve capacitance.Dielectrics have no free electrons for conduction because electrons are tightly bound to the nucleus. Because dielectrics contain a small number of electrons for electrical conductivity, they have a dipole. The two primary roles of dielectrics in electrical devices are insulation and electrical energy storage. An electric field polarizes the dielectric, and the polarization of the molecules allows dielectric materials to store charge.