Electrical_Kura

Power Electronics 5 th   semester Course content: Unit 1. Power Electronics Devices (10) 1.1 Power diode – Construction, Characteristic and ratings. 1.2 Power Transistor - Construction, Characteristic, use as power switch 1.3 Thyristor – Construction, Characteristics, Turn on mechanism, Turn-on process with gate signal, thyristor firing circuit, thyristor commutation and its type 1.4 GTO - Construction, Characteristics, 1.5 TRIAC – Construction and Characteristics. 1.6 MOSFET - Construction and Characteristics. 1.7 IGBT - Construction and Characteristics.   Unit 2. Power Rectifier (11) 2.1 Half wave and full wave single-phase rectifier – Circuit diagram, operating principle, calculation of average value, rms value, ripple factor, efficiency, filtering – C, L and LC filters. 2.2 Single-phase full wave controlled rectifier with resistive load, RL load, inversion mode of operation. 2.3 Three-phase rectifier with three numbers of diode. 2.4 Three-phase...

  Course Description : This course covers the electrical machines-three-phase induction motor and generator, single phase ac motors, synchronous generator and synchronous motor. It deals with the constructional details, operating principle, characteristics, testing methods of the above machines. Course content: Unit 1. Three Phase Induction Motor (15) 1.1 Constructional details – Yoke, stator, stator windings, and rotor – squirrel cage type and phase wound type. 1.2 Operation – Production of rotating magnetic field, operating principle, reversing the direction of rotation. 1.3 Stand still condition – equivalent circuit, starting current and starting torque. 1.4 Running condition - equivalent circuit, running current and torque. 1.5 Torque-Speed characteristics, effect of applied voltage on T-S characteristic, effect of rotor resistance on T-S characteristic. 1.6 Power stages, losses and efficiency 1.7 Starting methods – Direct On-line starting, Primary resistor method, Autotrans...