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Layering different dielectric materials to increase breakdown voltage
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[QUOTE="Baluncore, post: 5679652, member: 447632"] Welcome to PF. The fact that you are discussing dielectric constant suggests you are considering AC insulation. Each different material layer will make a parallel plate capacitor with a particular thickness between it's surfaces. You need to know the dielectric constant and the dielectric strength in V/mm of the materials used before you can put numbers on a multilayer insulation model. For DC it is the leakage current or resistance across each layer that sets the voltage drop. But with layers of capacitance in series, AC voltage is shared in proportion to the reciprocal of the capacitance. So if you double the thickness of a layer you double the breakdown voltage, but halve the capacitance, so twice the AC voltage appears across that layer. For that reason, when considering different dielectric material layers you must pay attention to the ratio of dielectric strength to dielectric constant. Your question can only be answered by putting numbers on the layers, and then operating some layers at voltages below their dielectric strength. Metallising the floating equipotential surfaces within multilayer insulation was called “chroming”. Layers of foil are used to make more reliable insulators by averaging out variations of the voltage drop across layers. [/QUOTE]
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Layering different dielectric materials to increase breakdown voltage
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