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Download Principle Types Of Generator`s
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MAULIK PAREKH 140280109061 ELECTRICAL HARSHAD PARGI 140280109062 MAYUR PARGI 140280109063 Introduction of DC Generator Principle of DC Generator Types of Generator’s Faraday’s Law Classification’s of Generator’s Separately Excited DC Generator’s Self Excited DC Generator’s MEHANICAL ENERG Y GENERATOR ELECTRICAL ENERGY There are two types of generators, one is ac generator and other is dc generator. Whatever may be the types of generators, it always converts mechanical power to electrical power. An ac generator produces alternating power. A dc generator produces direct power. Both of these generators produce electrical power, based on same fundamental principle of Faraday's law of electromagnetic induction EMF PRODUCE DYNAMICALLY EMF PRODUCE STATICALLY If set of stationary conductor’s placed in time Varying magnetic field then EMF will produce statically Separately excited generators are those whose whose field magnets are energized from external source of dc current Separately Excited Self Excited DC Generator These are generators in which the field winding is excited by the output of the generator itself. there are three types of self excited dc generators. Series wound In these type of generators, the field windings are connected in series with armature conductors whole electric current flows through the field coils as well as the load. As series field winding carries full load current it is designed with relatively few turns of thick wire. The electrical resistance of series field winding is therefore very low (nearly 0.5Ω ). In these type of DC generators the field windings are connected in parallel with armature conductors In shunt wound generators the voltage in the field winding is same as the voltage across the terminal. The field winding has high resistance and more number of turns so that only a part of armature current passes through field winding and the rest passes through load. In series wound generators, the output voltage is directly proportional with load current. In shunt wound generators, output voltage is inversely proportional with load current. A combination of these two types of generators can overcome the disadvantages of both. This combination of windings is called compound wound DC generator. A compound wound further divided into two types The generators in which only shunt field winding is in parallel with the armature winding The generators in which shunt field winding is in parallel with both series field and armature winding