3762384 Circuit Breaker

8/13/2019 3762384 Circuit Breaker

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CCIRCUITIRCUIT BBREAKERREAKERpresented by:presented by: M Aamir sohailM Aamir sohail

khankhan

& &

sufyan saleem sufyan saleem

Dept, of electricalDept, of electrical

engineering bahaudainengineering bahaudain

a!ariya uni"ersity #ultan ,a!ariya uni"ersity #ultan ,

$a!istan$a!istan


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WHAT IS A CIRCUIT BREAKER?WHAT IS A CIRCUIT BREAKER?

A circui !reaker is an e"ui#men haA circui !reaker is an e"ui#men ha

!reaks a circui eiher manually or!reaks a circui eiher manually or

auomaically un$er all con$iions aauomaically un$er all con$iions a

no loa$% full loa$ or shor circuino loa$% full loa$ or shor circui


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Operating Principle

Two contacts called electrode

remains closed under normaloperating conditions. When faultoccurs on any part of the system,the trip coil of the circuit breaker

get energized and contacts areseparated.


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Arc PhenomenonAn arc is struck when contactsare separated. The current is

thus able to continue. Thus themain duty of a circuit breaker isto distinguish the arc within theshortest possible time.


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The arc provides the lowresistance path to the current

and the current in the circuitremains uninterrupted.


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Methods of Arc Extinction

#igh $esistance %ethod

ow $esistance %ethod


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T&'(")*

!+$!+T

-$(A($

)+

!+$!+T

-$(A($

A+$ -A"T

!+$!+T

-$(A($

"*/

!+$!+T

-$(A($

0A!!%

!+$!+T

-$(A($


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Breaker Use$ In '()K*Breaker Use$ In '()K*

+ri$ Saion+ri$ Saion

,il Circui Breaker,il Circui Breaker

*acuum Circui !reaker*acuum Circui !reakerS-. Circui BreakerS-. Circui Breaker


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Air

cushion

Bulk ,il CircuiBulk ,il Circui

!reaker!reaker


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/o0 ,il Circui Breaker/o0 ,il Circui Breaker

Consiss of 0o #arsConsiss of 0o #ars

Su##orin1 Cham!erSu##orin1 Cham!er

Circui2Breakin1Circui2Breakin1cham!er3 consis ofcham!er3 consis of

fi4e$ an$ mo5in1fi4e$ an$ mo5in1conacconac66


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7isa$5ana1es ,f ,il Circui7isa$5ana1es ,f ,il Circui

BreakerBreaker

I is inflamma!le an$ here is a risk of fireI is inflamma!le an$ here is a risk of fire

I may form an e4#losi5e mi4ure 0ih airI may form an e4#losi5e mi4ure 0ih air

I re"uires mainenanceI re"uires mainenance

A!sor!s moisure% so $ielecric sren1hA!sor!s moisure% so $ielecric sren1hre$ucesre$uces

,il leaka1e #ro!lem,il leaka1e #ro!lem

,il has o !e re#lace$ afer some o#eraions,il has o !e re#lace$ afer some o#eraions

!ecause of he car!oni8aion of oil!ecause of he car!oni8aion of oil


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*acuum Circui Breaker*acuum Circui Breaker

*acuum is use$ as an arc "uenchin1*acuum is use$ as an arc "uenchin1

me$iumme$ium

Ha5e 1reaes insulain1 sren1hHa5e 1reaes insulain1 sren1h

'9'92:2:o '9o '92;2;#ressure is o !e#ressure is o !e

mainaine$mainaine$

Use$ in ''K* #anel in conrol room ofUse$ in ''K* #anel in conrol room of1ri$ saion1ri$ saion


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*acuum Circui Breaker*acuum Circui Breaker


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A$5ana1esA$5ana1es

Com#ac% relia!le an$ ha5e lon1er lifeCom#ac% relia!le an$ ha5e lon1er life


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S-. Circui BreakerS-. Circui Breaker

'' Sul#hur He4afluori$e 3S-.6 1as is use$ as anSul#hur He4afluori$e 3S-.6 1as is use$ as anarc "uenchin1 me$iumarc "uenchin1 me$ium

)) S-. is an elecro2ne1ai5e 1asS-. is an elecro2ne1ai5e 1as

(( I has sron1 en$ency o a!sor! elecronsI has sron1 en$ency o a!sor! elecrons

== When conac are o#ene$ in a hi1h #ressureWhen conac are o#ene$ in a hi1h #ressureflo0 of S-. 1as% arc #ro$uce$flo0 of S-. 1as% arc #ro$uce$

;; -ree elecron in he arc are ca#ure$ !y he-ree elecron in he arc are ca#ure$ !y he1as1as

.. Which !uil$ u# enou1h insulaion sren1h oWhich !uil$ u# enou1h insulaion sren1h oe4in1uish arce4in1uish arc

:: i is much effeci5e for hi1h #o0er an$ hi1hi is much effeci5e for hi1h #o0er an$ hi1h5ola1es ser5ices%5ola1es ser5ices%


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A$5ana1esA$5ana1es

Sim#le consrucion% less cosSim#le consrucion% less cos

S-. 1as is non flamma!le% non o4ic & chemical iner 1asS-. 1as is non flamma!le% non o4ic & chemical iner 1as

Same 1as is recirculae$ in he circuiSame 1as is recirculae$ in he circui

Mainenance free CBMainenance free CB

A!iliy o inerru# lo0 an$ hi1h faul currenA!iliy o inerru# lo0 an$ hi1h faul curren

E4cellen Arc e4incionE4cellen Arc e4incion


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A$5ana1es ,f S-. ,5er ,il CircuiA$5ana1es ,f S-. ,5er ,il Circui

BreakersBreakers

Shor arcin1 imeShor arcin1 ime

Can inerru# much lar1er currensCan inerru# much lar1er currens

+i5es noiseless o#eraion $ue o is close$+i5es noiseless o#eraion $ue o is close$

1as circui1as circui


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THE ENDTHE END

3762384 Circuit Breaker

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