Page | 1 A Design Report On Electrical System Design-I Submitted To For Partial Fulfillment of the Academic Requirements for the Award of Bachelor of Technology In Electrical Engineering SUBMITTED BY Arnab Nandi Roll No: 16901613025 Reg. No: 131690110525 of 2013-14 UNDER THE GUIDANCE OF Prof. Probal Mukherjee Prof. Sandipan Misra Department of Electrical Engineering ACADEMY OF TECHNOLOGY 2016-2017
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Page | 1
A
Design Report
On
Electrical System Design-I Submitted To
For Partial Fulfillment of the Academic Requirements for the Award of
Bachelor of Technology
In
Electrical Engineering
SUBMITTED BY
Arnab Nandi
Roll No: 16901613025
Reg. No: 131690110525 of 2013-14
UNDER THE GUIDANCE OF
Prof. Probal Mukherjee
Prof. Sandipan Misra
Department of Electrical Engineering
ACADEMY OF TECHNOLOGY
2016-2017
Page | 2
I undersigned, Arnab Nandi declare that this report on Electrical System Design-I
(EE-782) is the result of my work carried out during the 7th Semester of the B.Tech
course.
This report has not been previously submitted to any other university / institutions
for any other examination and for any other purpose by any other person. I will not
use this project report in future to use as submission to any other university,
institutions or any publisher. I also promise not to allow / permit any other persons
to copy / publish any part /full material of this report in any form.
ARNAB NANDI
Electrical Engineering,
Academy of Technology
Roll No: 16901613025
Reg. No: 131690110525 of 2013-14
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With profound respect and gratitude, I take this opportunity to convey my heartfelt gratitude
towards the academic and governing board of our University for including this course in our
B.Tech curriculum. I also express my gratitude towards our college for proving us such an
opportunity to improve our skills by assigning us this project.
My special thanks goes to Prof. Probal Mukherjee and Prof. Sandipan Mishra for guiding us
through this course.
I am also thankful Prof. Sandip Saha Chowdhury (H.O.D, Department of Electrical
Engineering) and all professors of Department of Electrical Engineering who have guided and
enlightened us throughout the B.Tech curriculum, and helped us in developing a thorough
knowledge of the various subjects which has been a significant factor for the accomplishment of
Weight of Lamination ....................................................................................................................................10
Calculation of Current Magnitudes ................................................................................................................11
Calculation of Cross Section Area .................................................................................................................11
Calculation of Number of Turns ....................................................................................................................11
Calculation of Length of Secondary Winding ................................................................................................12
Calculation of Length of Primary Winding ....................................................................................................12
Calculation of Winding Loss ..........................................................................................................................12
Tank Design ..........................................................................................................................................................13
Data Sheet .............................................................................................................................................................15
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To design a distribution transformer meeting the specified conditions
Rated Power (Q) 200 kVA
Primary Voltage 6.6 kV
Secondary Voltage 440 V
Frequency 50 Hz
Phase 3
Phasor Group Dy
Type Core type
Type of Cooling Oil Immersed Natural Cooled
Maximum Temperature Rise 35oC
Parameter Symbol Value Unit
Voltage/turns Factor Kt 0.5 (mΩ)1/2
Stacking Factor Kf 0.9
Yoke cross-section factor Ky 1.15
Peak flux density in core Bm 1.3 Tesla
Density of Si-steel σFe 7600 kg/m3
Core loss density ρFe 2 W/kg
Winding space factor Kw 0.27
Window aspect ratio α 3
Current density in winding δ 3.2 A/mm2
Resistivity of copper ρ 2.1 µΩcm
Density of copper σCu 8900 Kg/m3
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Electrical transformer is a static device which transforms electrical energy from one circuit to another without
any direct electrical connection and with the help of mutual induction between two windings. It transforms
power from one circuit to another without changing its frequency but may be in different voltage level.
Most transformers used in commercial and industrial facilities fall in the middle ground Because these
transformers represent the majority, we should evaluate them carefully before choosing a unit for a specific
project and/or application.
There are three main parameters in choosing a transformer:
It must have enough capacity to handle the expected loads (as well as a certain amount of overload)
Considerations should be given to possibly increasing the capacity to handle potential load growth
The funds allocated for its purchase be based on a certain life expectancy (with consideration to an
optimal decision on initial, operational, and installation costs.)
Both capacity and cost relate to a number of factors that you should evaluate. These include:
Application of the unit
Choice of insulation type (liquid-filled or dry type)
Choice of winding material (copper or aluminum)
Possible use of low-loss core material
Regulation (voltage stability)
Life expectancy
Temperature considerations
Losses (both no-load and operating losses)
Shielding
Accessories
The main parts of a transformer are:
Laminated core
Windings
Insulating Materials
Transformer oil
Oil Tank
Conservator
Cooling tubes
Figure 1: Section through a Distribution Transformer