Chic Export Company was established in Kolkata along with a group of well adept Engineers. The company is fully accredited by ISO 9001:2008 and has an abiding Interest in achieving the topmost stature by delivering products of finest quality and Providing the best of Electrical & Electronics solution services. All the equipments Manufactured are well in accordance with international standards and certified with the standard testing procedures. We deal with the products are this like AUTO RECLOSER, CIRCUIT BREAKER, DIGITAL ELECTRonICS METER, POWER QUALITY METER, PREPAID ELECTRICITY METER, SWITCHES, COMPUTER MONITOR, MOBILES PHONE, CPU Etc….

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CHIC EXPORT COMPANY
Manufacturer of Electrical Equipments
Vivekananda Nagar , Badu Road
MADHYAMGRAM, N(24) pgs.kol-129
Phone no: +91-(33) 2526 7024/28/29
Email id: chicexports@gmail.com/chicexport1@gmail.com

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ALTERNATOR
An alternator is an electrical generator that converts
mechanical energy to electrical energy in the form
of alternating current. For reasons of cost and simplicity,
most alternators use a rotating magnetic with a
stationary armature. Occasionally, a linear alternator or a
rotating armature with a stationary magnetic field is used.
In principle, any AC electrical generator can be called an
alternator, but usually the term refers to small rotating
machines driven by automotive and other internal
combustion engines. An alternator that uses a permanent
magnet for its magnetic field is called a magneto.
Alternators in power stations driven by steam
turbines are called turbo-alternators. Large 50 or
60 Hz phase alternators in power plants generate most of
the world's electric power, which is distributed by electric
power grids.
Specific applications
Electric generator:
Most power generation stations use synchronous
machines as their generators .connections of these
generator to this utility grid requires synchronization
conditions to be met
Automotive alternator
Alternators are used in modern automobiles to charge
the battery and to power the electrical system when its

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engine is running. Until the 1960s, automobiles used
DC dynamo generators with commentators.With the
availability of affordable silicon diode rectifiers,
alternators were used instead. Diesel electric
locomotive alternators In later diesel electric
locomotives and diesel electric multiple units, the
prime mover turns an alternator which provides
electricity for the traction motors (AC or DC).The
traction alternator usually incorporates integral silicon
diode rectifiers to provide the traction motors with up
to 1200 volts DC (DC traction, which is used directly)
or the common inverter bus (AC traction, which is first
inverted from dc to three-phase ac).The first diesel
electric locomotives, and many of those still in service,
use DC generators as, before silicon power
electronics, it was easier to control the speed of DC
traction motors. Most of these had two generators: one
to generate the excitation current for a larger main
generator. Optionally, the generator also supplies head
end power (HEP) or power for electric train heating.
The HEP option requires a constant engine speed,
typically 900 RPM for a 480 V 60 Hz HEP application,
even when the locomotive is not moving.
Marine alternators
Marine alternators used in yachts are similar to
automotive alternators, with appropriate adaptations to
the salt-water environment. Marine alternators are
designed to be explosion proof so that brush sparking

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will not ignite explosive gas mixtures in an engine
room environment.They may be 12 or 24 volt
depending on the type of system installed. Larger
marine diesels may have two or more alternators to
cope with the heavy electrical demand of a modern
yacht. On single alternator circuits, the power may be
split between the engine starting battery and the
domestic or house battery (or batteries) by use of
a split-charge diode (battery isolator) or a voltage-
sensitive relay.
Radio alternators
High frequency alternators of the variable-reluctance
type were applied commercially to radio transmission
in the low-frequency radio bands.These were used for
transmission of Morse code and, experimentally, for
transmission of voice and music. In the Alexanderson
alternator, both the field winding and armature winding
are stationary, and current is induced in the armature
by virtue of the changing magnetic reluctance of the
rotor (which has no windings or current carrying parts).
Such machines were made to produce radio frequency
current for radio transmissions, although the efficiency
was low.

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EXCITERS
Excitation systems is required to provide the necessary
field current to the
Rotor winding of a synchronous machine .Availability of
Excitation at all time
Important, Larger the lead current, lower the speeds and
lagging power factor
Which require more excitations
TYPES
DC EXCITATION SYSTEM

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AC EXCITATION SYSTEM
STATIC EXCITATION SYSTEM

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CURCUIT BREAKER
A circuit breaker is the mechanical device used to open
And close contract under normal and abnormal
condition
Relay is use as a sensor with circuit breaker for
automatic operation
Circuit breaker carry normal current without
overheating and damage
FUNTIONS OF THE CIRCUIT BREAKER
To carry full load current continuously
To open and close the circuit no load
To break the circuit under no load
To break the circuit under short –circuit conditions
TYPES OF CURCUIT BREAKER
According to voltage level
Low voltage CB :V<1000Vac , 1up to 100A
Medium voltage CB :V up to 72KV, 1 up to 6300A
High voltage CB :V up to 1200KV, 1>6300A

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CURRENT TRANSFORMERS
It is an instrument transformer which is used to measure
the current from high voltage line with
The use of normal ampere meter
High currents or voltages of electrical power systems
Cannot be directly fed to relays and meters. CT steps
Down rated system current to 1 AMP or 5
The relays and meters are generally design for 1AMP,
5AMP and 110V it is a normally step-down transformers
Secondary winding has a 5 ampere value of current
To the rated current of primary winding

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0
PROTENCIAL TRANSFORMARS
It is also a instrument transformers which is used to
Measure the voltage above 380 volts
PT make the ordinary low voltage instruments suitable
for
Measurement if high voltage and insolate from high
voltage
When rated high voltage is applied to primary of PT .it
give the
Secondary voltage of 110 volts

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BATTERIES
All power plants and substations DC supply for
protections
And control purpose
DC supply is provided from storage batteries
Lead acid batteries are mostly used in power stations
because their higher cell voltage and lower cost

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GENARATORS
In electricity generation , an electric generator is a device
that converts mechanical energy to electrical
Energy. A generator forces electric current to flow
Through an external circuit
Generator are varies in type according to the type of
power plant
Generator decide the size of power plant

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POWER TRANSFORMERS
Power transformers are used for stepping up the voltage
for transmission at generating stations and for stepping
down voltage for distribution purpose.
Normally naturally cooled , oil immersed , two winding ,
three phase transformers are used up
To the rating of 10MVA
For regulating the voltage , transformers are provide
With on load tap changers
They are put in operation during large load hours and
disconnected during light load hours

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VOLTAGE REGULETORS
Every alternator provide with automatic voltage regulator
Which perform following functions
1) control of voltage within prescribed limits
2) Proper division of reactive power b/w alternator
operating in parallel
3) preservation of dangerous over voltage in system
Types
Using transformer
Induction voltage regulator
Now-a-days electronic voltage regulators are used for
greater
Sensitivity and accuracy

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BUS-BARS
A bus-bar is a main bar or conductor carrying an
electric
Current to which many connections are to be made
Usually two buses are provided in a system one is called
the
“Main” bus and other “Auxiliary” or Transfer bus
There are many shapes of bus bar available like round
tubes
Round solid bars or square tubs
Material used for bus bar is aluminum because it has
high corrosion resistance then copper and lower cost
Bus bar of 5 to 6 meter in length

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REACTORS
Reactor is a coil having large inductive reactance in
Comparison on its resistance
It is used in the circuit to limit the short currents to a
Safer value in order to protect the electrical installation
As their reactance is very small, the efficiency of the
system is not affected
It avoid the faulty current to flow through the healthy
System
Types of the reactors
1. Open type
2. Oil immersed type

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INSULATORS
The porcelain insulators are used to support the bus bar
It also provide the insulation to the bus bar from pole to
ground
Current ratings porcelain is above 2000A

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SWITCHGEAR
During the operation if power system the generating
plants
Transmission lines, distributors and other electrical
equipment are required to be switched on and off under
both normal and abnormal conditions switchgears are
used
All the projection equipment like switches. Fuse. Circuit
breakers, relays are installed in switchgear
Types
1. Outdoor types
2. Indoor types
For the voltage above the 66KV Outdoor switchgears are
installed

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SWITCHES
A switch is a device which is used to making or breaking
the electric circuit. By sample motion of a knob or handle
They can make or break the circuit during normal and
abnormal conditions
Types
1.Air switches
2.Oil switches
Oil switches are used in a high voltage and heavy current
circuit

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PROTECTIVE EQUIPMENTS
Protective equipments are very important in system to
isolate the abnormal conditions
Feature of the protective equipment
1.greater reliability
2. High speed of operation
3. Simple and withstand to large value of fault
Various protective equipment are
Fuse, Circuit breakers, Relays, Lightning arresters

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FUSE
Fuse is a wire of short length or thin strip of material which
Melt with the flow of excessive current
Under normal working conditions safe value of current
flows bur during short circuit load current increased which
heat the wire so wire melt and circuit break
Advantages:-
1.cheap in cost
2.needs no maintenance
3.it interrupts short circuit current noise, flame, gas or
smoke
4.Under short circuit condition it limits the current
5. By the use of inverse time characteristic it is easily
provided for over load protection.
Disadvantages of fuse
1.wire should replaced after every operation

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RELAYS
Relay is electro-mechanical device which sense the
excessive flow of current and send signal to the circuit
breaker
Relay has three essential elements
1.Sensing elements- it sense and measured the change
2.comparing elements-compared the measured quantity to
pre-setted value
3.controlling elements-it sends signal to circuit breaker
TYPE OF RELAYS
1.Latching relay
2. Reed relay
3.Mercury relay
4. Polarized relay
5. Solid state relay

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CONTROL ROOMS
Control room is a nerve centre of the power station
Various controls like voltage adjustments, load control.
Emergency tripping of turbine and other equipment and
instruments are housed in the control room.
Location of control room is away from noise and should
near to the switch house
There should be no glare, neat and clean, well ventilated
and free from draughts