seminar report on
DESCRIPTION
SEMINAR REPORT ON. SF6. CIRCUIT BREAKER. BRANCH-EEE. CONTENTS. Introduction Operating Principle of Circuit Breaker Over view of SF6(Electrical properties) Physical and chemical properties Advantage Principle of operation of SF6 CB Conclusion References. - PowerPoint PPT PresentationTRANSCRIPT
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SEMINAR REPORT
ON
BRANCH-EEE.
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CONTENTSCONTENTS• IntroductionIntroduction• Operating Principle of Circuit BreakerOperating Principle of Circuit Breaker• Over view of SF6(Electrical properties)Over view of SF6(Electrical properties)• Physical and chemical propertiesPhysical and chemical properties• AdvantageAdvantage• Principle of operation of SF6 CBPrinciple of operation of SF6 CB• ConclusionConclusion• ReferencesReferences
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WHAT IS A CIRCUIT WHAT IS A CIRCUIT BREAKER?BREAKER?
A circuit breaker is an equipment which A circuit breaker is an equipment which cancan
make or break a circuit either make or break a circuit either manually or automatically under manually or automatically under normal conditionsnormal conditions
break a circuit automatically under break a circuit automatically under abnormal conditionsabnormal conditions
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Fixed contact
Moving contact
ARC
Fixed contact
Moving contact
ARCARC IS QUENCHED BY MEDIUM
IN A CIRCUIT BREAKER
OPERATING PRINCIPLE OF BREAKER
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OVERVIEW OF ARCS IN OVERVIEW OF ARCS IN BREAKERS-:BREAKERS-:
During the separation During the separation of contacts, due to of contacts, due to large fault current and large fault current and high current density high current density at the contact region at the contact region the surrounding the surrounding medium ionises and medium ionises and thus a conducting thus a conducting medium is formed. medium is formed. This is called the This is called the ARC.ARC.
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PRODUCTION OF ARC PRODUCTION OF ARC Factors responsible for arc:-Factors responsible for arc:-
Potential difference between the Potential difference between the contactscontacts
Ionized particles between the contactsIonized particles between the contacts
By removing any one of these the arc By removing any one of these the arc
can be quenched.can be quenched.
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OVERVIEW OF SFOVERVIEW OF SF66 GAS:-GAS:-
1. High dielectric strength
2. Excellent arc quenching ability
3. Excellent thermal stability
4. Good thermal conductivity
Electrical properties
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1. Chemically inert
2. Non-toxic
3. Non-corrosive
4. Non-flammable
Physical & Chemical properties
5. High density
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Dielectric properties of SFDielectric properties of SF66 gas:-gas:-
DS of SFDS of SF66 is 2.5 times of is 2.5 times of airair
DS of SFDS of SF66 is 30% less is 30% less than oilthan oil
DS of SFDS of SF66 is equal to oil is equal to oil at 650 gm/cm2at 650 gm/cm2
And 15% higher at 1.25 And 15% higher at 1.25 Kg/cm2Kg/cm2
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Advantages of SFAdvantages of SF66 gas:- gas:-
1. Increased safety
2. Reduced size
3. Easy installation
4. Low maintenance
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SFSF66 CIRCUIT CIRCUIT BREAKERBREAKER
OPERATIONOPERATION
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SFSF66 DECOMPOSITION DECOMPOSITION PRODUCTSPRODUCTS
SF6
SF4 + 2F
SOF2 + 2HF
MFn
SO2 + HF
SiF4 + 2 H2O
SPARK
H2O
H2O
SiO2
M
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magnitude & duration of discharge materials of construction of equipment contamination levels of moisture and air inside the equipment
Amount of each decomposition product depends on :-
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REMOVAL OF SFREMOVAL OF SF66 BYPRODUCTS:-BYPRODUCTS:-Byproducts are corrosive & likely to affect the Byproducts are corrosive & likely to affect the
organic materials.organic materials.Absorbent materials used in circuit breakersAbsorbent materials used in circuit breakers activated alumina( effective for activated alumina( effective for SOF2,H2S,SF2)SOF2,H2S,SF2) molecular sievesmolecular sieves( sodalime-( sodalime-CaO.NaOH)-CaO.NaOH)-removes removes
stable gases such asstable gases such as SF4,SiF4 & S2F2 SF4,SiF4 & S2F2 So suggested mix is 50/50 of sodalime& So suggested mix is 50/50 of sodalime&
alumina. The suggested weight of absorbent alumina. The suggested weight of absorbent is 10% of the weight of the gasis 10% of the weight of the gas
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ADVANTAGES OF SFADVANTAGES OF SF66 CIRCUIT BREAKERSCIRCUIT BREAKERS
Very short arcing periodVery short arcing period Can interrupt much Can interrupt much
larger currents as larger currents as compared to other compared to other breakersbreakers
No risk of fireNo risk of fire Low maintenance, light Low maintenance, light
foundation, minimum foundation, minimum auxiliary equipmentsauxiliary equipments
No over voltage problemNo over voltage problem
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CONCLUSIONCONCLUSION
Harnessing the utilities of Harnessing the utilities of SFSF66 gas gas in power system and power in power system and power system equipments, makes it system equipments, makes it more reliable and safer to use.more reliable and safer to use.
The countless advantages this The countless advantages this SFSF66 gas has to offer will take us to gas has to offer will take us to new heights in the prevalent new heights in the prevalent orthodox power system.orthodox power system.
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REFERENCES:REFERENCES:• www.wikipedia.orgwww.wikipedia.org• Power circuit breaker theory and Power circuit breaker theory and
design bdesign by C.H. Flurscheimy C.H. Flurscheim
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ANYANYQUESTIONS?QUESTIONS?