11.2 For each set of voltages, state whether or not the voltages form a balanced three-phase set. If the set is balanced, state whether the phase sequence is positive or negative. If the set is not balanced, explain why. PSPICE MULTISIM a) va = 180 cos 377t V, 180 cos(377t – 120°) V, Ve 180 cos(377t – 240°) V. b) va 180 sin 377t V, 180 sin(377t + 120°) V, 180 sin(377t – 120°) V. Ve c) va -400 sin 377t V, 400 sin(377t + 210°) V, 400 cos(377t – 30°) V. Ve %3D d) Va 200 cos(2000t + 30°) V, 201 cos(2000t + 150°) V, Ve 200 cos(2000t + 270°) V. 208 cos(630t + 42°) V, 208 cos(630t – 78°) V, 208 cos(630t - 201°) V. e) va %3D Ve f) Va 240 cos 377t V, 240 cos(377t - 120°) V, 240 cos(397t + 120°) V. %3D Ve =

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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.