1 COURSE PLANNER SUBJECT: DESIGN OF DC MACHINE AND TRANSFORMER [2160912] B.E. – THIRD YEAR Class – Electrical 2014 Term: 16/2 (DEC-16 to APR-17) Faculty: Prof. P.D.SOLANKI Prof. P.T. PATEL Prof. S.P.SHAH Prof. S.R.PATEL CONTENTS: 1. Course Outcomes 2. Course Contents [Syllabus] 3. List of Reference Books 4. List of Experiments 5. Major Equipment Required for Experiments 6. List of Open Source Software and Learning websites required for experiments 7. Active Learning Assignment and Tutorial. INSTRUCTIONS: 1. This set of Assignment-Tutorial consist the collection of questions of past GTU Question papers. 2. Attend the questions which are frequently asked in GTU exams and/or the questions which are Bold Marked. 3. Students should make a separate Chapter wise Files [Write in File Pages] to solve these Questions. 4. Students must solve these given set of Assignments by themselves only. 5. Assessment of given assignment should be done regularly after completion of each chapter by Students from the respective faculty members.
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COURSE PLANNER · 2017-06-22 · Machine, Design of Inter Poles, Effect and Minimization of Armature Reaction, Design of Commutator and Brushes, Numerical Example, Performance Parameter
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1
COURSE PLANNER
SUBJECT: DESIGN OF DC MACHINE AND
TRANSFORMER [2160912]
B.E. – THIRD YEAR
Class – Electrical 2014
Term: 16/2 (DEC-16 to APR-17)
Faculty: Prof. P.D.SOLANKI Prof. P.T. PATEL
Prof. S.P.SHAH Prof. S.R.PATEL
CONTENTS:
1. Course Outcomes
2. Course Contents [Syllabus]
3. List of Reference Books
4. List of Experiments
5. Major Equipment Required for Experiments
6. List of Open Source Software and Learning websites required for experiments
7. Active Learning Assignment and Tutorial.
INSTRUCTIONS:
1. This set of Assignment-Tutorial consist the collection of questions of past GTU
Question papers.
2. Attend the questions which are frequently asked in GTU exams and/or the
questions which are Bold Marked.
3. Students should make a separate Chapter wise Files [Write in File Pages] to solve
these Questions.
4. Students must solve these given set of Assignments by themselves only.
5. Assessment of given assignment should be done regularly after completion of each
chapter by Students from the respective faculty members.
2
1. Course Outcomes
After learning the course the students should be able to:
1. Design the DC machine of given specifications.
2. Prepare the detailed sketches of the designed machines.
3. Prepare the detailed sketches of the designed machines.
4. Design the various parts of DC machine with magnetic and electrical specification.
5. Design the various parts of Transformer with magnetic and electrical specification.
3
2. Course Contents
[Syllabus]
Subject Code: 2160912
Subject Name: Design of DC machines and Transformer
Sr.
No
Topics Total
Hrs.
%
Weightage
1
GENERAL DESIGN ASPECTS:
Specific Electric Loading and Specific Magnetic Loading, Output Co-
efficient, Output Equations for Transformers and Rotating Machines,
Factor Affecting Size of Machines, Criteria for selection of Specific
Loadings, Heating and Cooling of Transformer and Rotating Machines.
6
20
2
DESIGN OF THREE PHASE TRANSFORMER:
Types of Transformers, Position of HV and LV windings and its
importance, Relation between core and yoke cross section area and its
significance, Different types of Transformer windings, Different
Positions of tapping, Window Space Factor, Factor Affecting Window
Space Factor, Relation Between EMF per turn and transformer rating,
Stacking Factor.
MAIN DIMENSIONS:
Design of Window Dimensions, Yoke Dimensions and Over All Core
Dimensions, Numerical Examples.
DESIGN OF WINDINGS:
Design of HV and LV windings (No. of turns and area of cross section),
Selection type of Winding.
PERFORMANCE PARAMETER ESTIMATION:
Primary and Secondary Winding Resistance and Leakage Reactance
Calculation, Calculation of No Load Current, Losses and Temperature of
Transformer, Design of Tank with Tubes, Calculation of Dimension of
Tank, Numerical Examples, Variation of Output and Losses in
Transformer with Linear Dimension, Basic Design Aspect of Dry
Transformer and High Frequency Transformer, Basic Design Aspect of
Welding Transformers and Instrument Transformer.
18
40
3 DESIGN OF DC MACHINES:
Introduction, Output Equation, MMF Calculation, Selection of Number
of Poles, Design of Core length and Armature Diameter, Carter’s
fringing curves and its significance, Design of Length of Air Gap,
Numerical Examples.
ARMATURE DESIGN:
Choice of Armature Winding, Armature Conductor, Number of
Armature Slot, Slot Dimension, Slot Loading, Design of Armature Core,
Numerical Examples,
18
40
4
DESIGN OF FIELD SYSTEMS:
Pole Design, Design of Field Winding of Shunt, Series and Compound
Machine, Design of Inter Poles, Effect and Minimization of Armature
Reaction, Design of Commutator and Brushes, Numerical Example,
Performance Parameter Evaluation.
5
3. List of Reference Books
1. A Course in Electrical Machine Design - A.K. Sawhney
2. Electrical Machine Design – R.K. Agrawal
3. Design of Electrical Machine – V.N. Mittle
6
4. List of Experiments
Sr.
No. Experiments
1 To Study About Insulating Material, Heating and Cooling of Machines.
2 DESIGN SHEET 01: Different Parts of DC MACHINE.
3 Theory and Tutorial on Three Phase Transformer Design – I.
4
DESIGN SHEET 02: Sectional View of THREE PHASE
TRANSFORMER Based on Numerical And Sectional View of SINGLE
PHASE TRANSFORMER without Measures.
5 DESIGN SHEET 03: Constructional and Sectional View of DC
MACHINE.
6 Theory and Tutorial on Main Dimensions and Armature Winding Design of
DC MACHINE.
7 DESIGN SHEET 04: Design Layout of CORE TYPE DISTRIBUTION
TRANSFORMER.
8 Theory and Tutorial on Three Phase Transformer Design – II.
9 Theory and Tutorial on Field Winding Design of DC MACHINE.
10 DESIGN SHEET 05: Design Layout of CURRENT TRANSFORMER.
7
5. Major Equipment Required For
Experiments
Lab set up following machines
1. Cut Section Model of a) Transformer b) DC Machine
2. Charts to Explain Various Parts of Machine
6. List of Open Source Software and Learning Websites
Required for Experiments
1. http://www.electrical-engineering –portal.com/
2. http://nptel.iitm.ac.in/courses.php
3. Virtual Lab Website www.vlab.co.in
8
7. Active Learning Assignment and Tutorial.
1. Preparation of Power Point Slides which Include Videos, Animation, Pictures and Graphics for
better Understanding theory and practical work. 2. Tutorial
Chapter-1 GENERAL DESIGN ASPECTS:
Specific Electric Loading and Specific Magnetic Loading, Output Co-efficient,
Output Equations for Transformers and Rotating Machines, Factor Affecting Size
of Machines, Criteria for selection of Specific Loadings, Heating and Cooling of
Transformer and Rotating Machines
ATTEMPT ANY THREE
Sr.
No. QUESTION YEAR
MARK
S
1 Write short note on classification of insulating materials.
Nov-11
June-14
DEC-15
07
2 Define specific electric and specific magnetic loading. Also
state advantages and disadvantages of these loadings. Nov-11 07
3 Prepare a technical note on classification of insulating
materials. May-13 07
4
Briefly explain cooling methods of transformer.
Explain diff. cooling methods used for oil immersed
transformer
May-13
Dec-14
DEC15
07
5 Write a Short Note on : Duty Cycle Dec-13
June-14 07
6 Explain how temperature rise affects the life of electrical
Machine? Also explain Intermittent with starting duty cycle Dec-14 07
7 Explain criteria for selection of specific loading May-16 07
8 Write a short note on heating of electrical machine. MAY-16 07
9 How area of core is affected by weight of copper and iron. MAY-16 07
9
ATTEMPT ANY EIGHT
Sr.
No. QUESTION YEAR MARKS
1
Derive equation Et = k√Q where Q = kVA rating of a
transformer. Explain how service condition of
transformer affect the value of K.
NOV-11
MAY-15
JUNE-
14
DEC-15
OCT-16
07
Derive output equation of 3 –Φ Transformer. Write the
significance of constant ‘K’. DEC-13 07
Derive the output equation of a 3-phase core type
transformer. JUN-12 07
Explain in brief the factors affecting the value of K in
the expression of volt per turn in transformer design.
𝑬𝒕 = 𝑲 𝑲𝑽𝑨
JUN-12 07
Chapter-2
DESIGN OF THREE PHASE TRANSFORMER:
Types of Transformers, Position of HV and LV windings and its importance,
Relation between core and yoke cross section area and its significance,
Different types of Transformer windings, Different Positions of tapping,
Window Space Factor, Factor Affecting Window Space Factor, Relation
Between EMF per turn and transformer rating, Stacking Factor.
MAIN DIMENSIONS:
Design of Window Dimensions, Yoke Dimensions and Over All Core
Dimensions, Numerical Examples.
DESIGN OF WINDINGS:
Design of HV and LV windings (No. of turns and area of cross section),
Selection type of Winding.
PERFORMANCE PARAMETER ESTIMATION:
Primary and Secondary Winding Resistance and Leakage Reactance
Calculation, Calculation of No Load Current, Losses and Temperature of
Transformer, Design of Tank with Tubes, Calculation of Dimension of Tank,
Numerical Examples, Variation of Output and Losses in Transformer with
Linear Dimension, Basic Design Aspect of Dry Transformer and High
Frequency Transformer, Basic Design Aspect of Welding Transformers and
Instrument Transformer.
10
2
Answer the following questions with respect to transformer
design. (Be brief and to the point).
(1) Explain the reason for using stepped core construction.
(2) If a designer selects higher value of flux density what
will be its effect on performance and cost of the
transformer?
(3) Why tapings are usually provided on the h.v. winding
side?
NOV-11
07
3 What is design optimization? Derive necessary condition