Note for Electrical Technology - ET By Deepak Gupta

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LECTURE NOTES ON ELECTRICAL TECHNOLOGY –R15 LECTURE NOTES ON ELECTRICAL TECHNOLOGY B.Tech ECE II YEAR I SEMESTER (JNTUA-R15) Mrs.S.JAREENA ASSISTANT PROFESSOR DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING CHADALAWADA RAMANAMMA ENGINEERING COLLEGE CHADALAWADA NAGAR, RENIGUNTA ROAD, TIRUPATI (A.P) - 517506 DEPARTMENT OF EEE CREC Page 1

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LECTURE NOTES ON ELECTRICAL TECHNOLOGY –R15 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY ANANTAPUR II B.Tech I-Sem (E.C.E) T Tu C 3 1 3 (15A02306) ELECTRICAL TECHNOLOGY Objective: Electrical Technology contains Single phase transformers, Induction motors, DC generators and motors which are widely used in industry are covered and their performance aspects will be studied. UNIT- I DC GENERATORS D.C. Generators – Principle of Operation – Constructional Features – E. M.F Equation– Numerical Problems – Methods of Excitation – Separately Excited and Self Excited Generators – Build-Up of E.M.F - Critical Field Resistance and Critical Speed - Load Characteristics of Shunt, Series and Compound Generators- Applications UNIT – II D.C. MOTORS D.C Motors – Principle of Operation – Back E.M.F. –Torque Equation – Characteristics and Application of Shunt, Series and Compound Motors-Speed Control of D.C. Motors: Armature Voltage and Field Flux Control Methods. Three Point Starter-Losses – Constant & Variable Losses – Calculation of Efficiency - Swinburne’s Test. UNIT-III SINGLE PHASE TRANSFORMERS Single Phase Transformers - Constructional Details- Emf Equation - Operation on No Load and on Load - Phasor Diagrams-Equivalent Circuit - Losses and Efficiency-Regulation-OC and SC Tests – Sumpner’s Test - Predetermination of Efficiency and Regulation. DEPARTMENT OF EEE CREC Page 2

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LECTURE NOTES ON ELECTRICAL TECHNOLOGY –R15 UNIT-IV 3-PHASE INDUCTION MOTORS Polyphase Induction Motors-Construction Details of Cage and Wound Rotor Machines- Principle of Operation – Slip- Rotor Emf and Rotor Frequency - Torque Equation- Torque Slip Characteristics. UNIT – V SYNCHRONOUS MACHINES Principle And Constructional Features of Salient Pole and Round Rotor Machines – E.M.F Equation- Voltage Regulation by Synchronous Impedance Method- Theory of Operation of Synchronous Motor. OUTCOME: After going through this course the student gets a thorough knowledge on DC Motors & Generators, Transformers and Induction motors with which he/she can able to apply the above conceptual things to real-world problems and applications. TEXT BOOKS: 1. Electric Machines –by I.J.Nagrath & D.P.Kothari,Tata Mc Graw Hill, 7th Edition.2005 2. Basic Electrical Engineering –By T.K.Nagasarkar and M.S. Sukhija Oxford University Press. REFERENCE BOOKS: 1. Electrical and Electronic Technology, Hughes, Pearson Education. 2. Electrical Machines, P. S. Bimbhra, Khanna Publishers, 2011. 3. Basic Electrical Engineering, 2nd Edition, V.N. Mittle and Aravind Mittal, Mc Graw hill Education, 2006. DEPARTMENT OF EEE CREC Page 3

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LECTURE NOTES ON ELECTRICAL TECHNOLOGY –R15 UNIT-I DC GENERATORS DEPARTMENT OF EEE CREC Page 4