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DESIGN AND
CONSTRUCTION OF A SINGLE PHASE AUTO-TRANSFORMER OF RATING IKVA, 240V/110, 80
12V, 6V
ABSTRACT
This project work-up deals on the design and construction of a single phase
step down nations fermor, with raking IKVA, 240V/11OV, 80V 12U, 6V. It is a
multi-circuit transformer that has one input as the primary and tappins to
produce the output (secondary). It is considered as a single coil in series
with the supply and a common coil to the head. It is experimentally done using
flat metal shocks of cast steel to form the “E” and “I” shaped laminations and
coils of various turns.
Not much progress has been made by those who were in the field in the
production of a much circuit auto-transformer. While working this project, we
got information from some textbooks on auto-transformer and some expert in the
field.
However, the write up goes beyond the perspectives of an ordinary layman’s
belief that the theory behind the construction of an auto-transformer cannot be
achieved practically by Nigerian Engineers in this country. Every aspect of the
auto-transformer.
TABLE
OF CONTENTS
CHAPTER ONE
1.0
Introduction
1.1
Background
1.2
Aims of Study
1.3
The Scope of Study
1.4
The Auto-Transformer
1.5
Definition of Terms
CHAPTER
TWO
2.0
Literature Review
2.1
Definition and Operation of Auto-Transformer
2.2
Formulae of Auto-Transformer
2.3
Components of Flux in an Auto-Transformer
2.4
Fauits in Auto-Transformer
2.5
Losses in Auto-Transformer
CHAPTER THREE
3.0
Construction
3.1
Construction of the Former
3.2
Methods of Counting Members of Turns
3.3
Standard wire Guages and Lamination
3.4
Construction of the Enclosure and Complete Unit
3.5
Testings
3.6
Precautions
3.7
Bill of Quantities
CHAPTER
FOUR
4.0
Conclusion
4.1
Recommendation
References
CHAPTER
ONE
1.0
INTRODUCTION
Electrical energy has been considered
as one of the numerous form of energy and it distinguished itself vividly by
the widest application in the recent years.
Electrical energy is
particularly useful by reasons of the case with which it can be distributed and
converted to other desired forms lighting effects, heating effect magnetic
effect of electrical energy can be used to ran our inclustrus, boil our water,
provide light for our homes as well as servicing and easing other human
endeavours.
The wide use of
electricity has necessitated the development of systems of transmission and
distribution. Transmission systems are required (a) to enable sources of
natural energy (eg water fails – dams, or storage loaves, reservoirs for
hydropower station, fuel fields, coal gas, diesel – for thermal generating
station), for distant from the centre of energy demand (e.g large works,
industrial areas of cities), to be economically utilized, (b) to enable
generating plant to be concentrated in a few large. Favourably situated
stations; and (c) to per met of the in for connection of network or
distributing areas to ensure reliability economy and stability or continuity of
supply.
There are three main
facts in the production and utilization of electricity namely: generations
transmission, and distribution generation of electrical energy employs
electrical power stations. These power stations generate electrical energy
making use of fuel (e.g coal, gas, diesel) as mom raw material; hence thus type
is called steam or thermal power station. Other power stations make use of
water falls or storage haves – hence called hydro electric power station: etc.
No mater the type of
the power station employed, the voltage generated is usually in a low level e.g
11KV or 25KV. Owing to the distance between the centre of energy dim and
(consumption areas) to the power stations, transmission system of energy times
into play. A high voltage is desirable for transmitting large power in order to
decrease the 12R losses and reduce the amount of conductor material.
Therefore, a transformer is employed to step up the generated voltage to
3300KV/ the highest National Grid voltage although effort are being made to
increase it to 765KV for transmission. This 330KV is transmuted to the
distribution ends. A very much however voltage, on the other hand, is required
for distribution, for various reasons connected with safely and convenience.
The transformer also mavies this easily and economically possible as the 330KV
is stepped down to 132KV, 66KV, 33KV, 11KV, 415KV and to a minimum level of
240V for distribution to various load centre (consumption area).
1.1
BACKGROUND
The
device to increase (step up) or decrease (step down) the generated voltage is
called the transformer. It is a static (stationary) alternating consent
machine.
Basically, transformers are classified according to purpose namely:- power
transformer, distribution transformer, Auto-transformer and instrument
transformer, power transformer are large transformers generally used at
generating stations to step up the voltage, and at the substations to step d0wn
the voltage for supplying distribution systems. They may also be used for
tionving together two power stations. The power transformer has a high
utilization factor, e.g it is arranged that they run with an almost constant
load which is equal to their rating. The maximum efficiency is designed to be
at fall load. This means that the fall-load winding losses must be equal to the
here losses.
According to common usage, a transformer rated over 500KVA is termed a power
transformer.
The distribution transformer has a intermittent and variable head which is
usually considerable less than fall-head rating. They are therefore, designed
to have their maximum efficiency at between half and three – quarter of fall
head.
The instrument transformers are of two types depending on the mode of operation
voltage or current transformers. The current (series) and voltage (shunt)
transformers are used for extending the range of a.c. instruments in preference
to shunts and series resistors.
1.2
THE AIM OF STUDY
The aim of our study
is to design and construct an auto-transformer which can step-down 240V from
the local supply down to 110V, 80V, 12V, 6V, to sent the various voltage
requirements of numerous electrical and electronic appliances, often appliances
imported from say America where the domestic voltage level is 110Volts.
This auto-transformer
can conveniently do at a relatively cheap cost or rate. The output of this
transformer is made by making numerous tapping on the primary winding depending
on the required output.
1.3
SCOPE OF STUDY
The scope of our
study is committed to 1KVA auto-transformer (stepdown) that has these tappings
as follows 110V, 80V 12V, 6V. In view of this any other thin out side this
topic would not be considered.
Because of the
various voltage levels on the secondary, it can be used to supply voltage to
American equipment at 110V, for welding machines and electronic equipment at
12V, 6V and 80V, and for barberry charging at 6V or 12V.
1.4
DEFINITION OF TERMS
Transformer:
A transformer is alternating current machine which is usual to increase
(step-up) or decrease (step down) voltage (a.c).
Auto- Transformer:
This is a transformer with single winding. The single winding is common to both
the priming and the secondary of the transformer.
Winding:
The winding of a transformer is the band of copper conductor which is wound
into many farms on the transformer core.
Core:
The core of a transformer is a pile of haminated sheets of science steel.
Turns:
This is the number of times or rounds the copper conductor is wound on the
core.
Lamina:
This is a single sheet of the soft iron which is insulated or lamination.
Primary Winding:
The primary winding of a transformer is the winding that is directly connected
to the over is the winding that is directly connected to the supply.
Secondary Winding:
This is the winding that is directly connected to the head.
Tappings:
Tappings refers to the connections which are usually made successively in the
winding of a transformer especially in auto transformer.
Step up:
When the primary voltage is lower than the secondary voltage, the transformer
is caved a step up transformer.
Step down:
When the primary voltage is higher than the secondary voltage, the transformer
is called a step down transformer.
Window:
This is the space in the transformer core bounded by the 10Kes and the timbs of
the transformer.
Varnish:
This is an insulating Tigard which used to increase the insulation of the
transformer core and winding as well as making it inechanically strong. It so
laxities when air acts and it.
Copper Conductors:
These are bare copper worse which are used in transformer windings.
Wire Sleeve:
This can be fibre or plastic coating which is used to insulate and isolate the
transformer winding terminals.
Slot Popper:
This is a thick insulating paper which is used to wrap the transformer winding
and separate each layer of the winding. It serves as mechanical protection.
Center Block: This
is a wirden block approximately the size of the central limb of the transformer
core. It is on the centre block that the former is made.
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