Unit 1Three phase Synchronous machines Three phase Synchronous machines : Construction, rotating-field type and rotating-armature type, salient-pole and non-salient-pole type and their comparison. Excitation Methods. Three phase Synchronous generator (cylindrical rotor type) : Principle of operation. Emf equation and winding factors (No derivation), rating of generator. Generator on no-load and on balanced load. Armature reaction and its effect under different load power factors. Voltage drop due to armature resistance, leakage flux and synchronous reactance. Per phase equivalent circuit and Phasor diagram. Power - power angle relation. Three phase Synchronous generator (salient pole type) : Armature reaction as per Blondel’s two reaction theory for salient-pole machines, Direct-axis and quadrature-axis synchronous reactance’s and their determination by slip test. Phasor diagram of salient-pole generator and calculation of voltage regulation. (Chapter - 1) Unit 2Voltage regulation of Three phase Synchronous generator Performance of open circuit and short circuit test on synchronous generator, determination of voltage regulation by emf, mmf, and Potier triangle methods. Determination of voltage regulation by direct loading. Short circuit ratio. Parallel operation of 3-phase alternators : Necessity, conditions, Load sharing between two alternators in parallel (Descriptive treatment only). Process of synchronizing alternator with infinite bus-bar by lamp method (one dark & two equally bright lamp method) and by the use of synchroscope, Synchronizing current, power and torque (no numerical). (Chapter - 2) Unit 3Three phase synchronous motor Unit 43-ph induction motor, Induction generator and special purpose motors Unit 5A.C. series motor Unit 6Single phase induction motor
