Teaching GuideTerm Escola Politécnica de Enxeñaría de Ferrol |
Grao en Enxeñaría en Tecnoloxías Industriais |
Subjects |
Electrical Machines |
Contents |
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Identifying Data | 2023/24 | |||||||||||||
Subject | Electrical Machines | Code | 730G04050 | |||||||||||
Study programme |
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Descriptors | Cycle | Period | Year | Type | Credits | |||||||||
Graduate | 1st four-month period |
Third | Obligatory | 6 | ||||||||||
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Topic | Sub-topic |
The two blocks that divide the five subjects, develop the contents established in the file of the Verification Report. | BLOCK I. STATIC MACHINES. - Power transformers (CONTENTS: Basis of electrical machines and power transformers). BLOCK II. ROTATING MACHINES. - General principles of rotating electrical machines (CONTENTS: Basis of electrical machines). - Direct current machines (CONTENTS: Direct current machines). - Synchronous alternating current machines (CONTENTS: Alternating current machines). - Induction alternating current machines (CONTENTS: Alternating current machines). |
Power transformers. | * Need for the transformer. * Transformer power and parts. * Characteristic plate. * Coil with iron core. * Excitation or vacuum current of a transformer. * Principle of operation of an ideal transformer (single-phase). * Operation of a real transformer. * Equivalent circuit of a transformer. * Determination of homologous terminals. * Vacuum test. * Short circuit test. * Voltage drop in a transformer, Ferranti effect. Load index. * Losses and performance of a transformer. * Connecting current of a transformer. * Three-phase transformers. * Harmonics in excitation currents (three single-phase). * Connections of three-phase transformers. * Hourly indexes. * Parallel coupling of transformers. * Autotransformers. * Regulation sockets. * Meter transformers. * Voltage transformers. * Current transformers. |
General principles of rotating electrical machines. | * Basic elements of electrical machines * Delgas collector and ring collector. * Winding. * Losses and heating. * Rated or nominal power. Types of service * Magnetic field and m.m.f. in the air gap of an electrical machine. * Magnetic field and e.m.f. produced by a concentrated winding of diametral pitch. * F.m.m. produced by a distributed winding |
Direct current machines. | * Constructive aspects. * Principle of operation. * Armature reaction. * Commutation. * DC generators: General aspects. * DC generators: Service characteristics. * DC motors: General aspects. * D.C. Motors: Operating characteristics curves. * DC motors with independent excitation and shunt. * DC motors with series excitation. * DC motors with compound excitation. Ward-Leonard system. * DC motor: Braking methods. * Single-phase AC motors with delgas collector. * Brushless DC motors (brushless motors). |
Synchronous alternating machines. | * Construction principles. * Principle of alternator operation. * Armature reaction. * Equivalent circuit and vector diagram in the synchronous machine. * Characteristic curves. * Synchronous impedance. Vacuum and short-circuit test and Potier's method (or null fdp). * Regulation of outgoing pole machines. * Synchronous motor: generalities. * Coupling of an alternator to the network. * Active and reactive power developed by a synchronous machine coupled to an infinite power network. * Operation of a synchronous machine connected to an infinite power grid. |
Asynchronous alternating or induction machines. | * F.m.m. produced by a three-phase winding. Rotating fields. Ferraris theorem. * Relationship between an alternating field and a rotating field. Leblanc's theorem. * Constructive aspects (slip). * Principle of operation (angular velocity of the magnetic field cutting the rotor conductors). * Approximate equivalent circuit of the asynchronous motor. * Asynchronous motor tests: Vacuum or free rotor test and short-circuit or locked rotor test. * Power (active) in the synchronous machine. * Rotation torque. * Characteristic curves. * Asynchronous machine as generator and in brake effect (types of operation). * Starting of the asynchronous machine (squirrel cage and wound rotor motors). |
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