EEE 213

Single-phase Transformer:

• • principle of operation

  • construction

  • no load and excitation current

  • behaviour during loading

  • leakage flux

  • ideal transformer

  • leakage reactance

  • equivalent circuit of a transformer

  • equivalent impedance

  • voltage regulation

  • losses and loss minimization techniques

  • efficiency

  • determination of parameters by tests

  • polarity of transformer windings

  • transformer parallel operation

  • Autotransformer

  • instrument transformers

Three-phase Transformers: 

• • construction

  • connection configuration

  • vector group

  • parallel operation

  • power application

Induction Generator: 

• • working principle and operation

  • characteristics

  • voltage build up

  • applications in wind turbines

Three-phase Induction Motor: 

• • construction

  • squirrel cage, wound rotor

  • working principle

  • rotating magnetic field

  • synchronous speed

  • slip and its effect on rotor frequency and voltage

  • torque in induction motor

  • equivalent circuit of an induction motor

  • air gap power

  • mechanical power and developed torque

  • torque-speed characteristic

  • losses

  • efficiency

  • power factor

  • classification

  • shaping of torque speed characteristic

  • determination of induction motor parameters by tests

  • methods of braking, speed control and starting

Single-phase Induction Motor: 

• • operation

  • double revolving field theory

  • starting methods

  • equivalent circuit

  • torque-speed characteristic

  • performance calculation