JNTUk B.Tech Electrical Machines – II R13 Syllabus for Engineering it gives you detail information about Electrical Machines – II syllabus.
Preamble:
This course covers the topics on single-phase transformers, three-phase transformers and 3-phase induction motor which have wide application in power systems. The main aim of the course is to provide detail concepts, operation and performance of transformers and 3-phase induction motors. A complete design procedure for the design of transformers and 3-phase induction motors can be developed based on basic concepts discussed in unit- VI.
Learning objectives
- Appreciate the concept of operation and performance of single- phase transformers.
- Understand the methods of testing of single-phase transformer.
- Distinguish between single-phase and three-phase transformers.
- Understand the concept of operation and performance of 3-phase induction motor.
- Appreciate the relation between torque and slip, performance of induction motor and induction generator.
- Understand the basic concepts of design of transformers and 3-phase induction motors.
UNIT-I
Single-phase Transformers : Types and constructional details – principle of operation – emf equation – operation on no load and on load – lagging, leading and unity power factors loads – phasor diagrams of transformers – equivalent circuit – regulation – losses and efficiency – effect of variation of frequency and supply voltage on losses – All day efficiency.
UNIT-II
Single-phase Transformers Testing : Tests on single phase transformers – open circuit and short circuit tests – Sumpner’s test – separation of losses – parallel operation with equal voltage ratios – auto transformer – equivalent circuit – comparison with two winding transformers.
UNIT-III
3-Phase Transformers : Polyphase connections – Y/Y, Y/∆, ∆/Y, ∆/∆ and open ∆ — Third harmonics in phase voltages – three winding transformers: determination of Zp, Zs and Zt — transients in switching – off load and on load tap changers — Scott connection.
UNIT-IV
3-phase Induction Motors : construction details of cage and wound rotor machines – production of a rotating magnetic field – principle of operation – rotor emf and rotor frequency – rotor current and pf at standstill and during running conditions – rotor power input, rotor copper loss and mechanical power developed and their inter relationship – equivalent circuit – phasor diagram.
UNIT-V
Characteristics, starting and testing methods of Induction Motors : Torque equation – expressions for maximum torque and starting torque – torque slip characteristic – double cage and deep bar rotors – crawling and cogging – no load and blocked rotor tests – circle diagram for predetermination of performance – methods of starting – starting current and torque calculations – induction generator operation.
UNIT-VI
Design of transformer and 3-phase induction motor : Transformer: Design concept – output equation – choice of windings – calculation of number of turns – length of mean turn of winding – calculation of resistance and leakage reactance. Three phase induction motor: Design concept – choice of specific electric and magnetic loadings – output equation – stator design – number of slots – conductor dimensions – type of winding – number of rotor slots – conductor dimensions.
Learning outcomes
- Able to explain the operation and performance of single phase transformer.
- Able to explain the regulation losses and efficiency of single phase transformer.
- Able to explain types of three phase transformer connection, tap changing methods and 3-phase to 2-phase transformation.
- Able to explain the operation and performance of three phase induction motor.
- Able to analyze the torque-speed relation, performance of induction motor and induction generator.
- Able to explain design procedure for transformers and three phase induction motors.
TEXT BOOKS
- The performance and design of alternating current machines – M.G. Say, CBS publishers & distributors, New Delhi.
- Electrical Machines – P.S. Bimbra, Khanna Publishers.
REFERENCE BOOKS
- Electrical Machines by J.B.Guptha, S.K.Kataria & Sons.
- Electrical Machines by D. P.Kothari, I. J. Nagarth, Mc Graw Hill Publications, 4th edition.
- Electrical Machines by R.K.Rajput, Lakshmi publications,Fifth edition.
- Electrical Machine Design by Sawhney, Dhanpath Rai Publications.
- Electrical Machines by Smarajit Ghosh, Pearson Publications.
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