Electrical and Electronics - Lingaya's University

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B.Tech. Electrical & Electronics Engineering (Regular)6. D. C. MOTORS: Construction, principle andoperation of D.C motors; back emf concept; torqueequation; power balance equation; Characteristicsof different types of DC motors, losses in DCmotors, efficiency, testing: Swinburne‘s,Hopkinson‘s, and retardation test.7. CONTROL OF DC MOTORS: Necessity of starter;3 point and 4 point starters. Speed control; fluxControl; armature resistance and armature voltagecontrol. Electrical Braking: Methods of electricalbraking i.e. dynamic, regenerative and plugging.TEXT BOOKBhimbara, P.S., ―Electrical Machinery‖, KhannaPublishers, 2000.REFERENCE BOOKS1. Kumar, K. Murguresh, ―DC Machines & Transformers‖,Vikas Publishing House Pvt. Ltd., 19992. Ghosh, Smarajit, ―Electrical Machines‖, PearsonPublishing, 2005.3. Bhimbara, P.S., ―Generalized Theory of ElectricMachines‖, Khanna Publishers, 19754. Kingsley, Fitzgerald C & Umans, S.D., ―ElectricMachinery‖, McGraw Hill Book Co., 1992.5. Say, M.G., ―Theory, Performance & Design of A.CMachines‖, ELBS 1986.6. Mcpherson George, ―Introduction to ElectricMachines & Transformers‖, John Wiley & Sons, 1980.EL-256ELECTRICAL MACHINES-ILAB.L T P Cr0 0 2 1LIST OF EXPERIMENTS:1. To find turns ratio and polarity of a 1-phasetransformer.2. To perform open and short circuit tests on a 1-phase transformer.3. To perform Sumpner's Back to back test on 1-phase transformers.4. Parallel operation of two 1-phase transformers.5. To convert three phase to 2-phase by Scottconnection.6. To perform load test on DC shunt generator.7. Speed control of DC shunt motor.8. Swinburne‘s test of DC shunts motor.9. Hopkinson‘s test of DC shunt M/Cs.10. Ward Leonard method of speed control.11. To plot o.c.c. Of D.C. Shunt generator12. To perform load test on DC shunt Motor.REFERENCE BOOKS1. Kumar, K. Murguresh, ―DC Machines & Transformers‖,Vikas Publishing House Pvt. Ltd., 19992. Ghosh, Smarajit, ―Electrical Machines‖, PearsonPublishing, 2005.3. Bhimbara, P.S., ―Generalized Theory of ElectricMachines‖, Khanna Publishers, 1975EL-301CONTROL SYSTEMSL T P Cr5 1 0 4OBJECTIVEProviding sound knowledge about the various controlsystem techniques required for the operation andaccurate controls of Industrial processes and otherstrategies for complicated processes and efficientcontrol.PRE-REQUISITESKnowledge of Mathematics and Electrical Engineering1. INTRODUCTION TO CONTROL PROBLEM:Industrial control examples; Transfer functionmodels of mechanical; electrical; thermal andhydraulic systems; systems with dead- time,system response; control hardware and models:potentiometers; synchros; LVDT; dc and acservomotors; tacho-generators; electrohydraulicvalves; hydraulic servomotors; electropneumaticvalves; pneumatic actuators; closed-loop systems.Block diagram and signal flow graph analysis;transfer function.2. BASIC CHARACTERISTICS OF FEEDBACKCONTROL SYSTEM: Stability; steady-stateaccuracy; transient accuracy; disturbancerejection; insensitivity and robustness. Basicmodes of feedback control: proportional; integraland derivative. Feed-forward and multi-loop controlconfigurations.3. TIME DOMAIN ANALYSIS: Introduction;standard input signals; response of 1 st and 2 ndorder systems; time domain specifications i.e.;rise time; peak time; delay time; peakovershoot; settling time; steady state error etc.;different types of feedback systems; steadystate errors for unit ramp; unit step and unitparabolic inputs; effects of addition of zerostom the system.4. STABILITY ANALYSIS: Introduction; concept ofstability; conditions for stable system; asymptotic;relative and marginal stability; Routh-Hurwitzcriterion for stability and various difficulties withRouth-Hurwitz criterion.5. ROOT LOCUS TECHNIQUE: Introduction;concepts of root locus; construction of root loci andvarious rules pertaining to locus diagramdevelopment.6. FREQUENCY DOMAIN ANALYSIS ANDSTABILITY: Introduction; relation between timeand frequency response for 2 nd order system;Bode plot; construction procedure for bode plot;gain cross over and phase cross over frequency;gain margin and phase margin; Nyquist plot andNyquist stability criterion.7. STATE-VARIABLE ANALYSIS: Concept of state;state variable; state model; state models for linearcontinuous time functions; diagonalization of transferfunction; solution of state equations; concept ofcontrollability and Observability.TEXTBOOKNagrath and Gopal, ―Control System Engineering‖ ,New Age International, 2005REFERENCE BOOKS1. Ogata .K. ―Modern Control Engineering‘‘, PearsonEducation, 20002. Gopal Madan ―Control System – Principles &Design‖ Tata McGraw Hill, 19983. Dorl.R. C. & Bishop ―Modern Control Engineering‖,Addison Wesley, 1999.4. Kuo, B. C. ―Automatic control System‖, John Wiley& Sons, 199830
Lingaya’s University, FaridabadEL-302POWER ELECTRONICSL T P Cr5 0 0 3OBJECTIVEProviding a sound understanding of the fundamentalconcepts of power electronics devices theircharacteristic, operation, control and applications.PRE-REQUISITESKnowledge of basic electronics electrical andelectronics circuits.1. POWER ELECTRONIC DEVICES: Role of PowerElectronics; Classification of power electronicdevices; construction; characteristics andapplications of power transistor; power MOSFET;IGBT;GTO; SCR; triac; diac; Two transistoranalogy for turning ON-OFF SCR; turn ONmechanism; different methods of turning ON-OFFSCR; turn OFF mechanism; thyristor firingcircuits.2. OPERATION & PROTECTION OF SCR: Series -parallel operation of SCRs; firing ckts. for seriesand parallel operation; static and dynamicequalising ckts.; equalisation of current in parallelconnected SCRs; string efficiency; derating factor;Devices used in control circuits; protection of SCRsagainst di/dt; dv/dt; radio freq. interference; overvoltage; over current.3. DIFFERENT TYPES OF SCR RECTIFIERS:Principle of phase control; half wave controlledrectifier; half controlled bridge and fully controlledbridge rectifier for resistive and RL load; derivationfor output voltage and current; effect of freewheeling diode; single phase dual converters.Three phase half controlled bridge and fullycontrolled bridge rectifier.4. INVERTER CIRCUITS: Basic circuits for forcedcommutation; series inverter; improved seriesinverter; parallel inverter; out put voltage andwaveform control; principle of operation for threephase bridge inverter in 120 deg. and 180 deg.mode; single phase transistorized bridgeinverter.5. DC CHOPPER: Basic principles of chopper; timeratio control and current limit control techniques;voltage commutated chopper circuit.; Joneschopper; step-up chopper; step-down chopper;Regulated DC Power supplies and SMPS6. AC VOLTAGE REGULATORS: Types ofregulators; equation of load current; calculation ofextinction angle; out put voltage equation;harmonics in load voltage. Synchronous tapchangers. Three phase voltage regulators. Basicprinciple of cyclo-converters; single phase to singlephase and three phase cyclo-converters; Loadcommutated and force commutated cycloconverters7. APPLICATION OF POWER ELECTRONICS:Static circuit breakers; fan speed regulator;principle of soft start circuits. Zero VoltageSwitch; UPS; and Induction heating; static VARControlTEXT BOOKRashid.M.H. ―Power Electronics Circuits Devices andApplication‖ Prentice Hall of India, 2000REFERENCE BOOKS1. Bimbhra.P.S. ―Power Electronics‖ KhannaPublisher, 20092. Sen. P.C. ―Power Electronics‖, Tata McGraw Hill,19993. Rai. H.C. ―Industrial and Power Electronics‖ ,Galgotia Publication , 2000.4. Agrawal Vineeta, Krishna Kant, ―PowerElectronics‖, BPB Publications, 20025. Singh .M.D. & Khanchandani K.B. ―PowerElectronics‖ Tata McGraw Hill, 2003.EL-305ELECTRICAL MACHINES-IIL T P Cr5 1 0 4OBJECTIVEProviding sound knowledge about the principles ofoperation of various electrical machines, theirconstructional features, and their behavior andcharacteristics under various condition of operation.PRE-REQUISITESKnowledge of electrical technology and electricalmachines-I1. THREE PHASE INDUCTION MOTOR: Review orconstructional details; production of rotating field;induction motor action; torque production; testingof induction motor; losses and efficiency;development of equivalent circuit; performancecharacteristics; circle diagram; starting methodsof 3 phase induction motor i.e. D.O.L starter;stator rheostat starter; Auto transformer starting;star delta starter; methods of speed control; statorvoltage control; stator resistance control;frequency control; rotor resistance control; slippower recovery control; double squirrel cagerotor; deep bar squirrel cage motor; Inductiongenerator-grid connected and self excited mode;space harmonics and their effect on motorperformance.2. SINGLE PHASE MOTORS: Double revolving fieldtheory; cross field theory; equivalent circuit;characteristics and starting of single phase motorby different methods; shaded pole machine.3. PRINCIPLES OF SYNCHRONOUS MACHINES:Construction features of synchronous machines;cylindrical rotor and salient pole machines; termsrelated to winding of synchronous machines; coilspan factor; distributed A.C winding types;distribution factor; excitation systems; E.M.Fequation and harmonic elimination armaturereactions.4. SYNCHRONUS GENERATORS: Interactionbetween excitation flux and armature m.m.f;equivalent circuit model and phasor diagram forcylindrical rotor machine. Salient pole machine:two reaction theory; equivalent circuit; model andphasor diagrams; power angle equations andcharacteristics; slip test; transient and subtransientreactances; voltage regulation: Differentmethods for finding voltage regulation i.e. EMFmethod; MMF method; Pottier triangle method;synchronization of alternators by differentmethods; parallel operation and load sharing;active and reactive power control.31
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