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3 PHASE AUTOMATIC STAR- DELTA

STARTER USING RELAYS AND

ADJUSTABLE ELECTRONIC TIMERSFOR INDUCTION MOTOR

SUBMITTED BY

EDGEFX TEAM

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ABSTRACT

Star/Delta starters are probably the most common reduced

voltage starters in the 50Hz industrial motor world

(Known as Wye / Delta starters in the 60Hz USA world)

They are used in an attempt to reduce the start current

applied to the motor during start as a means of reducing

the disturbances and interference on the electrical supply.

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BLOCK DIAGRAM

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HARD WARE EQUIPMENTS

POWER SUPPLY BLOCK

RELAY

INDUCTION MOTOR

555 TIMER

BC 547 TRNSISTOR

BC 558

IN4007 RECTIFIER DIODE

LED

RESISTORS & CAPACITORS

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555 TIMER The 555 Timer IC is an integrated circuit (chip)

implementing a variety of timer and multivibrator

applications.

The original name was the SE555 (metal can)/NE555

(plastic DIP) and the part was described as "The IC Time

Machine".

Depending on the manufacturer, the standard 555 package

includes over 20 transistors, 2 diodes and 15 resistorson a

silicon chip installed in an 8-pin mini dual-in-line

package (DIP-8)

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PIN DIAGRAM OF 555

The 555 timer IC is a simple 8 pin DIL package IC.

It can:

be used as a monostable

be used as an astable

source or sink 100mA

use supply voltages of 5v to 15v

disrupt the power supply - use a decoupling

capacitor!

http://en.wikipedia.org/wiki/File:Signetics_NE555N.JPG

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THREE PHASE INDUCTION MOTOR

It consists of the fixed stator or frame, a three-phase winding

supplied fromthe three-phase mains and a turning rotor There is no electrical connectionbetween the stator and the

rotor

Stator and rotor are made of highly magnetizable coresheetproviding low eddy current and hysteresis losses

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Stator & Rotor

Thestator winding consists of three individual windings which

overlap one another and are offset by an electrical angle of 120

Synchronous Speed (Ns)= 60; f/p

Ns= Synchronous Speed/ minute;

F= frequency;

P=Pole pair Number;

Rotor in induction machines with squirrel-cage rotors consists of a

slotted cylindrical rotor core sheet package with aluminum

barswhich are joined at the front by rings to form a closed cage

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Diagrams

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BC547The BC547 transistor is an NPN Epitaxial

Silicon Transistor.

The BC547 transistor is a general-purpose

transistor in small plastic packages.

It is used in general-purpose switching and

amplification BC847/BC547 series 45 V, 100 mA

NPN general-purpose transistors.

Whenever base is high, then current starts

flowing through base and emitter and after that

only current will pass from collector to emitter

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BC558

The BC557 transistor is an PNP Epitaxial Silicon

Transistor

The BC557 transistor is a general-purpose transistor in

small plastic packages. It is used in general-purpose

switching and amplification BC847/BC547 series 45 V,

100 mA PNP general-purpose transistors.

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The arrow in the PNP transistor symbol is on the emitter

leg and points in the direction of the conventional current

flow when the device is in forward active mode.

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RELAY

IT IS A ELECTRO MAGNETIC SWITCH

USED TO CONTROL THE ELECTRICAL DEVICES

COPPER CORE MAGNETIC FLUX PLAYS MAIN ROLE HERE

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BIBILOGRAPHY

The 8051 Microcontroller and Embedded systems by Muhammad Ali

Mazidi and Janice Gillispie Mazidi , Pearson Education.

ATMEL 89S52 Data Sheets. www.atmel.com

www.beyondlogic.org

www.wikipedia.org

www.howstuffworks.com

www.alldatasheets.com

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THANK Q