term paper on generator by ibrahim & rifath_ict_3rd batch_1st semester_2011
TRANSCRIPT
Department of Information and communication Technology
Comilla University
Term paper on
Generator
Submitted To: Khondokar Fida Hasan Email:[email protected] Lecturer Dept. of ICT Comilla University, Comilla
Submitted by:
Sl.no. Name ID Contact
1Md. Ibrahim Talukdar 1009005 01925470243
2Rifath Chowdhury 1109047 01673917182
Date of submission: 25.04.2012
1
Acknowledgement
The new dimension of skill has added our brain through making the term paper
on ”GENERATOR”. We had no experience of making term paper. We could not
understand how should make it. But in the appropriate time we find the skillful
guider named ‘Khondokar Fida Hasan’ who guide the proper information to make
the term paper named ”GENERATOR”
2
TABLE OF CONTENTS
1. Introduction ……………………………………………..
2. Literature review………………………………………..
3. Methodology……………………………………………
4. Result………………………………………………….
5. Discussion………………………………………………
6. Conclusion………………………………………………
7. Bibliography……………………………………………..
8. Appendix………………………………………………..
3
INTRODUCTION
A generator is a machine that converts mechanical energy into electrical energy by
using the principle of magnetic induction. This principle is explained as follows:
Whenever a conductor is moved within a magnetic field in such a way that the
conductor cuts across magnetic lines of flux, voltage is generated in the conductor.
Electrical energy from the wind is a fast-growing area worldwide. Various
wind turbine and generator topologies have been developed to maximize
the energy conversion efficiency, the system reliability and minimize the
cost. A challenge with wind turbines is to convert a relatively low and variable
input - the wind impinging on the rotor - into a much faster and steady alternating
current output suitable for grid connection [1]. This challenge becomes
more and more pronounced with the rapid increase in wind turbine
power ratings. This paper reviews some of the more popular wind turbine
generator concepts and the available commercial products, with the focus
on the generator design and the impact of the generator topology on the overall
wind turbine system. After summarizing current trends and challenges in the
MW size machines, a new wind turbine concept, which avoids the gearbox
and power electronic converters, is proposed to improve the system's
overall efficiency, the reliability, the nacelle weight and possibly the system's
overall cost.
4
CLASSIFICATION OF GENERATORS
Self-excited generators are classed according to the type of field connection they
use. There are three general types of field connections — SERIES-WOUND,
SHUNT-WOUND (parallel), and COMPOUND-WOUND. Compound-wound
generators are further classified as cumulative-compound and differential-
compound. These last two classifications are not discussed in this chapter.
Series-Wound Generator
In the series-wound generator the field windings are connected in series with the
armature. Current that flows in the armature flows through the external circuit and
through the field.
A series-wound generator uses very low resistance field coils, which consist of a
few turns of large diameter wire.
The voltage output increases as the load circuit starts drawing more current. Under
low-load current conditions, the current that flows in the load and through the
generator is small. Since small current means that a small magnetic field is set up
by the field poles, only a small voltage is induced in the armature. If the resistance
of the load decreases, the load current increases. Under this condition, more current
flows through the field. This increases the magnetic field and increases the output
voltage. A series-wound dc generator has the characteristic that the output voltage
varies with load current. This is undesirable in most applications. For this reason,
this type of generator is rarely used in everyday practice.
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Shunt-Wound Generators
In a shunt-wound generator, like the one shown in figure 1-16, the field coils
consist of manyturns of small wire. They are connected in parallel with the load. In
other words, they are connected across the output voltage of the armature.
The series-wound generator has provided an easy method to introduce you to the
subject of self- excited generators. Current in the field windings of a shunt-wound
generator is independent of the load current (currents in parallel branches are
independent of each other). Since field current, and therefore field strength, is not
affected by load current, the output voltage remains more nearly constant than does
the output voltage of the series-wound generator.
In actual use, the output voltage in a dc shunt-wound generator varies inversely as
load current
varies. The output voltage decreases as load current increases because the voltage
drop across the
armature resistance increases (E = IR).
In a series-wound generator, output voltage varies directly with load current. In the
shunt-wound
generator, output voltage varies inversely with load current. A combination of the
two types can
overcome the disadvantages of both. This combination of windings is called the
compound-wound dc
generator.
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Compound-Wound Generators
Compound-wound generators have a series-field winding in addition to a shunt-
field winding, as
shown in figure 1-17. The shunt and series windings are wound on the same pole
pieces.
In the compound-wound generator when load current increases, the armature
voltage decreases just as in the shunt-wound generator. This causes the voltage
applied to the shunt-field winding to decrease, which results in a decrease in the
magnetic field. This same increase in load current, since it flows through the series
winding, causes an increase in the magnetic field produced by that winding.
By proportioning the two fields so that the decrease in the shunt field is just
compensated by the increase in the series field, the output voltage remains
constant. This is shown in figure 1-18, which shows the voltage characteristics of
the series-, shunt-, and compound-wound generators. As you can see, by
proportioning the effects of the two fields (series and shunt), a compound-wound
generator provides a constant output voltage under varying load conditions. Actual
curves are seldom, if ever, as perfect as shown
Amplidynes are special-purpose dc generators. They supply large dc currents,
precisely controlled, to the large dc motors used to drive heavy physical loads,
such as gun turrets and missile launchers.
The amplidyne is really a motor AMPLIDYNES and a generator. It consists of a
constant-speed ac motor (the prime mover) mechanically coupled to a dc
generator, which is wired to function as a high-gain amplifier (an amplifier is a
device in which a small input voltage can control a large current source). For
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instance, in a normal dc generator, a small dc voltage applied to the field windings
is able to control the output of the generator. In a typical generator, a change in
voltage from 0-volt dc to 3-volts dc applied to the field winding may cause the
generator output to vary from 0-volt dc to 300-volts dc. If the 3 volts applied to the
field winding is considered an input, and the 300 volts taken from the brushes is an
output, there is a gain of 100. Gain is expressed as the ratio of output to input:
NOTE: The lower the percent of regulation, the better the generator. In the above
example, the 5% regulation represented a 22-volt change from no load to full load.
A 1% change would represent a change of 4.4 volts, which, of course, would be
better.
VOLTAGE CONTROL
Voltage control is either (1) manual or (2) automatic. In most cases the process
involves changing the resistance of the field circuit. By changing the field circuit
resistance, the field current is controlled. Controlling the field current permits
control of the output voltage. The major difference between the various voltage
control systems is merely the method by which the field circuit resistance and the
current are controlled.
VOLTAGE REGULATION should not be confused with VOLTAGE CONTROL.
As described previously, voltage regulation is an internal action occurring within
the generator whenever the load changes. Voltage control is an imposed action,
usually through an external adjustment, for the purpose of increasing or decreasing
terminal voltage.
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GENERATOR CONSTRUCTION
A through E, shows the component parts of dc generators. Figure 1-20 shows the
entire generator with the component parts installed. The cutaway drawing helps
you to see the physical relationship of the components to each other.
This type of field rheostat contains tapped resistors with leads to a multiterminal
switch. The arm of the switch may be rotated to make contact with the various
resistor taps. This varies the amount of resistance in the field circuit. Rotating the
arm in the direction of the LOWER arrow (counterclockwise) increases the
resistance and lowers the output voltage. Rotating the arm in the direction of the
RAISE arrow (clockwise) decreases the resistance and increases the output
voltage.
Most field rheostats for generators use resistors of alloy wire. They have a high
specific resistance and a low temperature coefficient. These alloys include copper,
nickel, manganese, and chromium. They are marked under trade names such as
Nichrome, Advance, Manganin, and so forth. Some very large generators use cast-
iron grids in place of rheostats, and motor-operated switching mechanisms to
provide voltage control.
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LITERATURE REVIEW
Upon completion of the topics we will be able to know about”GENERATOR”: 1. State the principle by which generators convert mechanical energy to electrical energy.
2. State the rule to be applied when you determine the direction of induced emf in a coil.
3. State the purpose of slip rings.
4. State the reason why no emf is induced in a rotating coil as it passes through a neutral plane. 5. State what component causes a generator to produce direct current rather than alternatingcurrent.
6. Identify the point at which the brush contact should change from one commutator segment to the
next.
7. State how field strength can be varied in a dc generator.
8. Describe the cause of sparking between brushes and commutator.
9. State what is meant by "armature reaction."
10. State the purpose of interpoles.
11. Explain the effect of motor reaction in a dc generator.
12. Explain the causes of armature losses.
13. List the types of armatures used in dc generators
14. State the three classifications of dc generators.
15. State the term that applies to voltage variation from no-load to full-load conditions and how it is expressed as a percentage.
16. State the term that describes the use of two or more generators to supply a common load.
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METHODOLOGY
The present invention is related to a device of a "structure of generator/motor",
especially refer to a magnetic component with permeable part used as magnetic field in
the structure of generator/motor to decrease magnetic abrasion caused by disordered
magnetic line of force when magnetic field and coil process relative movement or
rotation.
Description of the Prior Art. A conventional motor is rotated by outside
working, that is, transform electric power into mechanic power after power on; whereas
generator takes advantage of the change of magnetic flux to produce sensitive
electromotive, that is, transform mechanic power into electric power, while general
conventional generator/motor is of rotation type, that is, all mechanic power output by
rotation work, or generate electric by the work of rotation; the generator/motor in
current market normally apply Faraday's law or Lenz's law as generating or driven
principle.
General generator/motor a consists of a shell body a1, and a stator a2 which is fixed
around the inner edge of the shell body a1 and combined from a plurality of magnetic
components a21, and a rotator a3 in the center of the shell body. Make uses of the
magnetic field effect formed by the relative movement between the rolling rotator a3
and stator a2 to produce induction electric, and then output by the guide of the carbon
brushes a4 situated above the rotator.
Because of the rotator a3 combined from several pieces of silica-steel a31 and coil
set a32, the rotator a3 itself and stator a2 fixed at the inner wall of shell body a1 induce
magnetic field effect, and result the rotator a3 stuck at the flow direction of the magnetic
line of force, hence, rotator a3 has to resist the magnetic force before rotating, the power
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consuming to overcome the suction force cause extra energy expense, furthermore the
conventional generator a transmit the electric by the contact between carbon brush a4
and rotator a3, the carbon brush a4 after long duration of usage become wear and tear
more or less that cause electric voltage of generator a conflicts lower voltage, unsteady,
and even short life duration, etc.
The magnetic components of the conventional generator/motor makes use of
two round plates with different magnetism (N and S magnetism) to yield the magnetic
field. The two adjacent plates with different magnetism and arranged around the inner
edge of the shell body of the generator/motor yield disorder allocation of magnetic line
of force and cause the phenomenon of "magnetic abrasion", and therefore impair the
magnetic field of generator/motor, then bring the issues of inefficiency.
"How Generators & Regulators Work"
Once you understand the basics of how a battery works and how it is
constructed, we can move on to the generator, which is the second most
important parts of the electrical system. To sound bona fide, I might as well give
you the official job description of the gen- erator. It is "a machine that converts
mechanical energy, supplied by the engine, into electrical energy used for either
recharging the battery or supplying power to the electrical system." While the
description seems a little confusing, if you follow along a little further we will
make sense out of it all. Come on, it'll be better than you think.
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THE WORK SCHEDULE FOR THE GENERATOR FAMILY
When the engine speed is at idle or at low rpm, the generator has
little or no output, and the battery provides all the electrical energy needed for
the electrical system. When vehicle speed reaches about 20 mph or engine rpm
reaches about 1200, the generator will begin to charge. The output will help the
battery with some of the electrical load. (This speed is known as the generator
"cut-in" speed.) At higher engine rpm of about 1800, the generator is capable of
providing all of the electrical current needed to run the accessories, as well as
recharge the battery as needed. Generators will usually provide their maximum
output at about 1800 to 2300 rpm engine speed. Normally the pulley diameter of
a generator is designed so the engine will spin the generator at, or close to, its
ideal rpm, (the rpm at which the generator operates most efficiently.) This rpm
is matched to the rpm at which the engine will spend most of its time.
IN MOST OLDER CAR APPLICATIONS, THE GENERATOR
ARMATURE TURNs ABOUT TWICE FOR EVERY RPM THE
ENGINE TURNS.
When a generator spins at high speeds (above 3500 rpm engine speed)
the output of the generator will actually drop off quite a bit, as the brushes are
lifted off of the arma- ture by centrifugal force. If heavier brush springs were
used (a great idea), it would cause excessive brush wear at the slow speeds.
An interesting note: Did you ever wonder why over the road trucks get
such long Life out of their generator brushes as compared to a car? Here are
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the reasons. One is the constant rpm that make it easy to match the correct
engine to generator speed.
The other factor is called air gap. This is when the brushes lift off of the
commutator just slightly due to the centrifugal force. The brushes will then
experience minimum wear because the brushes are not physically touching the
commutator and the loss in output will be slight. Cars driven in town will wear
out generator brushes at a much faster rate than those that spend their life
traveling up and down the highway. The same principle applies.
WHILE WE ARE ON THE SUBJECT OF BRUSHES...BUICK CARS OF THE
LATE 1940's AND EARLY 1950's HAD AN INTERESTING SAFETY FEATURE.
They had what they called a "brush protected generator." The "field" wire
of the charging system was routed through the ignition system. When the
brushes in the genera- tor got too "short" from wear, the field wire would
"ground out" the ignition and the car would not start. While this was a good idea
in theory, it left a lot of early-day Buick owners stranded without warning (and
very unhappy). The servicemen of the day carried a jumper
wire in the tow truck. If this was the problem (a simple check), they used the
jumper wire to by- pass the generator to ignition circuit. If the car started, they
simply drove it back to the dealership and installed new brushes in the
generator. And the customer was happily on his way.
HOW COME THERE ARE SO MANY DIFFERENT SIZE PULLEYS
USED ON THE SAME STYLE OF GENERATOR?
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As we learned earlier, the pulley size is matched to the rpm at which the
engine will spend most of its time running. In-town delivery trucks had a small
diameter pulley so the armature turned faster at the low engine rpm, increasing
the output at the slow speeds.
MAKING ELECTRICITY
All generators "make" electricity in much the same way. Let's take a look
and see what parts make up a generator and what job each of those parts has
to perform. As I have done before, I will give you the official description of what
a generator does, then explain things in common English.
Generator operation is based on the principle of electromagnetic
induction. This means that voltage is generated when any conductor is moved
at right angles through a magnetic field. When voltage is produced in this
manner, it will cause the current to flow in the conductor if that conductor is a
complete circuit. Whew! Got all that? Now let's ex- plain that in common
sense terms, starting with the internal parts.
ARMATURE - An armature starts out as a bare hardened steel shaft. To
this shaft is added a series or group of non-insulated copper wires wound close
together. They in turn will form what is called a loop. The loops of wire are then
embedded in a series of slots in an iron core.
This iron core is then attached to the armature shaft. This shaft spins and
helps to generate the electrical current. As you might guess, the size of the wire
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and the number of wires in the loop will affect the output of the generator.
COMMUTATOR - The commutator is a series of segments or barsthat are also
attached to the armature shaft at the rear of the armature. It is the wire ends
from the loops of the armature windings in the iron core that are attached to the
commutator. When this is done, a complete circuit is formed.
FIELD COILS - Field coils are the windings or the group of wires that are
Wrapped around the pole magnet. It is the job of the field coils to take the
current drawn to the pole magnet, and make it stronger. (Field coils are the
windings that are attached to the inside of the generator housing.) This in-
creased strength in current will force even more current to be drawn to the pole
magnets, which will continue to build up current.This is how the current
produced by the generator is built up and increased, until it can be used by the
battery and the accessories.sponge. This provides the lubrication between the
shaft and the bushing. They can also be re-oiled from the oiling tube on the
outside of the generator. Some heavy-duty generators will use ball bearings
instead of bushings for the armature shaft to ride . This is done to support a
radiator fan or other accessory.
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BUILDING A WORKING GENERATOR
An assembled generator will look some- thing like this: The electrical rule that
ap- plies to a generator states that "electrical voltage will be generated when
any conduc- tor is moved at right angles through a mag- netic field." To
demonstrate this theory to yourself take a simple horseshoe magnet and stand
it on its side. (It will have a north pole and a south pole, just like in your
generator.) Now take a piece of plain copper wire and move it back and forth
between the poles of the magnet. You will be breaking the mag- netic field,
which will produce a magnetic current inside of your wire. This is exactly what
the armature does to the field coils. When current is produced this way, it will
cause current to flow in the conductor if it is a complete circuit. The armature
with the loops of wire embedded in the slots of an iron core? Didn't the ends go
down and connect to the commutator to form a complete circuit.
First let's look at a simple generator with an armature that has only one turn or
loop of wire and two pole pieces. These pole pieces will always have some
"magnetism" left over from the last job they did.
However, these magnets are week because of the magnetic field between
them. These two magnets are exactly opposite of each other. That is the cause
of the weak current. They will tend to cancel out each other.If we place the
armature between these two magnets and then spin it in a clockwise direction, a
weak voltage will be "generated." Remember, the rule of generators says that
any current generated will flow to the conductor if it is a complete circuit.
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Because the armature is a complete circuit, the current will flow to the armature
and then to the field coils where the voltage will be increased. The rotating
armature cutting through the current produced by the field coils forces even
more current through the field
coils that makes still more stronger voltage. This is how the voltage generated
by the loops is increased into voltage that can be used by the battery and the
accessories. Now, if we were to add a real armature to our generator with
additional loops of wires imbedded in an iron core and connected to the
commutator, what is going to happen? That's right. Any voltage generator by
any one loop will be added to the voltage developed by any of the other loops.
By having multiple loops, an almost constantsupply of voltage is developed,
finally!As you might guess, the strength of the magnetic field, the number of
conductors on BRUSHES - After the generator develops the current, it is the
brushes that carry the cur- rent to the "field" circuit and the "load" circuit, so the
electricity can be used by the battery and the accessories. This process is
called "commutation." The brushes will ride on the commutator segments of
the armature. Brush holders hold thebrushes in position by way of spring
tension. Most automotive generators will containtwo brushes, one that is
grounded to the frame of the generator, one that will be insulated from the
frame. The insulated brush is the positive brush and is connected to the "A"
terminal of the generator, and to one end of the field coils. The other end ofthe
field coil is connected to the insulated "F" terminal of the generator.
BEARINGS AND BUSHINGS - At either end of a generator you will find a
bushing or a bearing. They have the job of making the armature shaft run true
in the housing between the field coils and pole shoes. Bushings will be made of
copper or brass and are soaked in oil before they are installed. The brass or
copper bushing material is porous and able to absorb the oil like the armature, 18
and the speed at which the armature is turned will affect the output of the
generator. Just like the internal parts of a battery, all of these things are
matched
to the application.
OUR GENERATOR IS CHARGING. WHAT HAPPENS IF WE SPIN THE
ARMATURE REALLY FAST TO PROVIDE A HIGH OUTPUT FOR A HEAVY
ELECTRICAL LOAD?
Right. Things are going to get hot, in part
because of the resistance or electrical
friction and in part due to the mechanical
friction. What will happen to our generator
then? The high heat can melt the "varnish" and damage the insulation used to
hold the loops or conductors in the armature slots. Also, the soldered
connections of the armature coils and the commutator bars will melt from the
heat. When this happens, it is commonly called "throwing the solder" out of the
generator. Besides losing all of the solder, the bars of the commutator separate
from the shaft that holds everything together; in simple terms, everything just
flies apart, and the generator is ruined. To prevent this damage, a current
regulator is necessary. Just as it sounds, a cur- rent regulator limits the amount
of current the generator is allowed to produce for both the electrical demand of
the accessories, and the safe limit of current the generator can pro- duce
without damage to the generator itself. Another source of internal heat that has
to be dealt with is called "iron loss." The iron core of the armature will act as a
large electrical conductor, and will "cut" magnetic. An amp gauge will tell you
the amount of amps passing into or being drawn out of the battery. The volt
meter, on the other hand, will tell you the "pressure" behind the amps.
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CURRENT REGULATION
Besides the voltage being regulated, the current output (amps) of a generator is
also regulated by what is called a current regulator. The current regulator is
built inside of the voltage regulator and works in much the same way as the
voltage regulator. The main difference you will notice is that located on the
inside of the voltage regulator, the current side of the regulator is made up of
wire that is thicker(heavier gauge), and there are less turns or wraps of wire on
the coil. Remember, the current regulator has to carry all of the amps the
generator is producing.
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If, on the other hand, the generator is turning slowly, the battery is in need of a charge, and all of the accessories are turned on, it will be the current regulator doing the work. This type of circuit where the regula- tor is a part of the field circuit is called an "A" circuit. An "A" circuit is easily identified because the contact points are always located after the field coils. This type of circuit is com- mon to the General Motors family of vehicles.
The voltage regulator and current regulator are units in the external
circuit used to "sense" either high voltage supplied to the electrical system or high current supplied to the external loads...see diagram
at right.
OK, MY SHOP MANUAL SAYS I HAVE A "B" CIRCUIT REGULATOR. HOW IS THAT DIFFERENT FROM AN "A" CIRCUIT REGULATOR?
A "B" circuit regulator works in much the same way that an "A" circuit type regulator does. The only difference is the contact points are located before the field coils instead of after. There is no advantage to either location and they both work equally well.
"B" circuit regulators are common to Ford cars and trucks.
CHECKING REGULATOR OUTPUT
"SO DO YOU CHECK AND ADJUST "A" AND "B" CIRCUIT REGULATORS THE SAME WAY?"
No, they are both checked differently. If you have to adjust the regulator at some point in time, it is best to follow the directions in your shop manual. The secret is to know how the regulator works; then reading those directions will make sense.
This illustration shows the various factors involved in voltage regulation and the manner in which it is done.
Check out the following illustrations. A simplified circuit employing both current and voltage regula- tors is illustrated. The regulator or contact points are located "after" the field coils ("A" circuit). The field current is attached to the insulated brush inside the generator.
21
All you have to do is check the connections at the brushes and the field. If
the generator field coil is connected to the insulated brush at the back of
the generator, you have an "A" circuit.
If the generator field coil lead is connected to either the grounded brush (a
brush that goes to ground) inside of the generator, or is connected to the
inside of the generator frame itself, you have a "B" circuit. From there all
you have to do is follow the directions given in them repair manual.
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RESULT
Electricity Produced by Generators
o A spinning copper coil located between two magnets can create
a steady flow of electrons. Forcing these electrons or electric charges
to move through an external circuit that connects to anything that
needs power produces the energy to make it work. The relation
between magnets and electrons shows how a generator functions. By
passing electrons through electrical wires, conduction of electricity
happens when forced by the magnetic fields produced when
mechanical energy converts into electrical energy.
Gas Powered Generators
o During a power outage, home appliances such as refrigerators,
air-conditioners and furnaces can run on gas-powered electricity.
Home generators provide temporary power by the introduction of
electricity through temporary connections of the appliances to the
generator. If desired, connecting a generator to a home's electrical
system permanently can automatically trigger electricity during
blackouts.
Wind Powered Generators
o The propellers or blades around a rotor turn when the wind blows
against them, producing energy. This energy passes from the rotor to the
main shaft, then spins the generator to create electricity. A tower
approximately 100 feet in height holds the wind turbines to capture most
energy coming from the wind. Wind turbines can produce electricity for a
single building or home as well as distribute electricity through power grids.
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DISCUSSION
Types of Generators
o Generators come in two types: standby and portable
generators. The standby generators are larger than the portable
ones. By permanently installing or stationing them outside an
establishment such as a building or a home, they provide backup
power in case the main source of electricity switches off during a
power outage. Plug the standby generators into the main electrical
lines to enable automatic sensing of power interruption by the
generator. It should only take a few seconds for the standby
generators to come online. Portable generators, on the other hand,
are ones that are not stationery and smaller in scale. These
generators are transported on top of a rolling cart or a trailer or lifted
by hand. Portable generators provide temporary power for areas such
as camping sites or construction sites. They can provide enough
power for smaller appliances by using gasoline as fuel.
Importance of Generators
o Generators can provide electricity during power interruptions. They
can prevent companies from losing productivity during a power outage. In a
household, generators can prevent food spoilage and enable people to wash
and iron clothes during a power outage.
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BIBLIOGRAPHY
http://www.google.com/.
http://www . generator.com/
http://www.introduction generator.com/
http://www.structure generator.com/
http://www.work generator.com/
htttp://www.DC generator.com/
http://www.AC generator.com/
http://www.importance of generator.com/
http://www.history of generator.com/
http://www.wekipedia.com/
Generators Buy in Japan No.1 Generator Trade Company
Fast, Honest & Reliable! Contact Uswww.kinki-truck.co.jp
DataCenter Cloud Computer Servers Workstations Motherboards
w/ Intel® Xeon® Processor E5
familySupermicro.com.tw/NetworkStorageHPC
Manage Microsoft Windows Streamline Windows Administration
and Management. Free 30-day Trialwww.systemtools.com
Cat Generator Sets 7 - 16000kW Electric Power
Gensets. Diesel Or Gas Fueledwww.catelectricpowerinfo.com
25
APPENDIX
1.ACG =alternating current generator
2.DCG=direct current generator
3.EG=engine generator
4.GCG=gas control generator
5.FDG=faraday disk generator
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