Power Plant: Power Generation

Name the basic parts of a generator and describe the function of each in inducing voltage. Describe the primary difference between a single-phase generator and a three-phase generator. Name two factors that determine the frequency of the current produced by a generator. Explain why the frequency of a generators output must be controlled. Explain the function of the exciter in a generator. Name the parts of a direct current (DC) exciter and the parts of a brushless exciter and describe their functions. Explain why a large generator is typically cooled with hydrogen instead of air. Explain the function of an oil seal in a hydrogen-cooled generator. Describe how hydrogen is supplied to a generator cooling system. Explain the purpose of each of the following components in a hydrogen generator cooling system: purity analyzer core monitor hydrogen dryer and liquid detector. Explain how carbon dioxide and air are used to purge a generator cooling system. Describe the flow of water in a typical stator cooling system. Describe the function of each of the following components in a typical stator cooling system: temperature control valve pressure control valve and demineralizer.