Example: A30,5KVA,208V,60HZ,synchronous machine has negligible stator winding resistance and Xs =80 per phase at rating terminal voltage. The machine is first operated as generator in parallel with a 30,208V,60HZ power supply. Determine: a) The excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 PF lagging. Draw the phasor diagram for this condition b) If the field excitation current is now increased by 20%,find the stator current ,power factor, and kVA supplied by the machine. Dr Audih 18

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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.