Teaching GuideTerm 2023/24
Escola Politécnica de Enxeñaría de Ferrol
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Grao en Enxeñaría en Tecnoloxías Industriais
 Subjects
  Electrical Machines
   Contents
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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