Utilization Of Electrical Energy

UNIT I: Electric Drives Basic concept of electric drives, choice of electric drives, fundamental torque equation, speed torque converter and multi quadrant operation, equivalent values of drive parameters, concept of load torque, calculation of time and energy loss in transient operation, steady state stability and load equalization, UNIT II: Control Of Electric Drives Modes of operation, classification of drives, closed loop control of drives, current, torque speed , position etc. Controllers PI, PID, PLL, Heating and Cooling of motors, Selection of motor power rating under different loading conditions, Continuous, Short and Intermittent periodic duty, Review of torque speed characteristics of AC and DC motors. UNIT III: AC Drives Induction motor drives, Review of conventional method of Starting, Braking and Speed control, Voltage source inverter (VSI) and Current source inverter (CSI) fed three-phase induction motor drives, Cycloconverter fed drives, Static Kramer & Scherbius drives. Synchronous motor drives: Speed control of synchronous motor using voltage and current source inverters, Self controlled synchronous motor drives employing load commuted thyristor inverter. UNIT IV: Traction drives Nature of traction load, Important feature of traction drives, Motors employed in traction, Conventional method for AC and DC traction drives control, Semiconductor converter controlled drives employing DC motors, AC motors for 25 KV AC traction. Heating and welding: Types of electric heating, resistance ovens, Induction heating, dielectric heating, Arc furnace, Resistance welding and Arc welding. UNIT V: Illumination& Energy Conservation Nature of light, production of light, lighting calculation, factory lighting, flood lighting and street lighting. Measures of Energy Conservation in Electric drives, Use of Efficient semiconductor Converters, Efficient Motors, Variable speed drives etc Text Books: 1. “Fundamentals of electrical drives”,G K Dubey, 2nd edition, Narosa Pb 2. “Electric Drives’’ Vedam Subramanyam, TMH Pbs. 3. “Utilization of electric energy”, Taylor, Orient Longman Pbs. Reference Books: 1. “Electric drives”, De and Sen, PHI Pbs. 2. “A first course on Electric drives”S K Pillai, University press. 3. “Modern Power Electronics and A C Drives’’ B K Bose, Pearson Education