Introduction to Plasma Processing SF 6 Circuit Breaker Student: Hosny, Ahmed A. Instructor: Prof....
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Transcript of Introduction to Plasma Processing SF 6 Circuit Breaker Student: Hosny, Ahmed A. Instructor: Prof....
Introduction to Plasma Introduction to Plasma ProcessingProcessing
SFSF66 Circuit Breaker Circuit Breaker
Student: Hosny, Ahmed A.Student: Hosny, Ahmed A.
Instructor: Prof. Kasra EtemadiInstructor: Prof. Kasra Etemadi
Outline …Outline …
IntroductionIntroduction Why SFWhy SF66 Circuit Breakers? Circuit Breakers? Advantages/DisadvantagesAdvantages/Disadvantages How does it work?How does it work? ApplicationsApplications SummarySummary ReferencesReferences
IntroductionIntroduction
What Kind of What Kind of Plasma do we deal Plasma do we deal with?with?
100 1020 1022 1024108 1010 1012 1014 1016 1018
105
102 104 106
104
103
102
101
100
10-1
Ave
rage
Ele
ctro
n E
nerg
y, [
eV]
Electron Number density, [cm-3]
ThermonuclearPlasmas
Electron Beam
GlowDischarge
ArcDischarge
Solid
MHDGeneratorIonosphere
SolarCorona
InterstellarGas
GaseousNebulae
P=
100
Hz
P=
10 K
Hz
P=
1 M
Hz
P=
100
MH
z
P=
10 G
Hz
P=
1 T
Hz
100 1020 1022 1024108 1010 1012 1014 1016 1018
105
102 104 106
104
103
102
101
100
10-1
Ave
rage
Ele
ctro
n E
nerg
y, [
eV]
Electron Number density, [cm-3]
ThermonuclearPlasmas
Electron Beam
GlowDischarge
ArcDischarge
Solid
MHDGeneratorIonosphere
SolarCorona
InterstellarGas
GaseousNebulae
100 1020 1022 1024108 1010 1012 1014 1016 1018
105
102 104 106
104
103
102
101
100
10-1
Ave
rage
Ele
ctro
n E
nerg
y, [
eV]
Electron Number density, [cm-3]100 1020 1022 1024108 1010 1012 1014 1016 1018
105
102 104 106
104
103
102
101
100
10-1
100 1020 1022 1024108 1010 1012 1014 1016 1018
105
102 104 106
104
103
102
101
100
10-1
Ave
rage
Ele
ctro
n E
nerg
y, [
eV]
Electron Number density, [cm-3]
ThermonuclearPlasmas
Electron Beam
GlowDischarge
ArcDischarge
Solid
MHDGeneratorIonosphere
SolarCorona
InterstellarGas
GaseousNebulae
P=
100
Hz
P=
10 K
Hz
P=
1 M
Hz
P=
100
MH
z
P=
10 G
Hz
P=
1 T
Hz
IntroductionIntroduction
What is Circuit What is Circuit Breakers (CBs)?Breakers (CBs)?
CB is one of the most essential CB is one of the most essential safety mechanisms in electric safety mechanisms in electric
networks.networks. Interrupt short circuit currents Interrupt short circuit currents
(~ 60kA, low pf ~ 0.1).(~ 60kA, low pf ~ 0.1). Fault clearance time is very Fault clearance time is very
important for power system important for power system stability and avoid equipment stability and avoid equipment damage for itself and the rest damage for itself and the rest of the network.of the network.
Introduction (Cont.)Introduction (Cont.)
CBs typesCBs types Oil circuit breakersOil circuit breakers Vacuum circuit Vacuum circuit
breakers breakers Magnetic Air Circuit Magnetic Air Circuit
BreakersBreakers Air-blast circuit Air-blast circuit
breakersbreakers SFSF66 circuit breakers circuit breakers
Figure 2 SF6 partial interrupter unit.
Advantages/Disadvantages?Advantages/Disadvantages?
SFSF66 has a dielectric strength of about two to three has a dielectric strength of about two to three times that of air.times that of air.
It is nontoxic.It is nontoxic. It is nonflammable.It is nonflammable. It is noncorrosive; it doesn’t react with other It is noncorrosive; it doesn’t react with other
materials because it is inert gas. However, when materials because it is inert gas. However, when it is heated to 5000C it decomposes and its it is heated to 5000C it decomposes and its decomposition products react with other decomposition products react with other materials.materials.
It exhibits excellent properties for arc quenching. It exhibits excellent properties for arc quenching. So, it used as an interrupting medium in circuit So, it used as an interrupting medium in circuit breakers instead of air or oil.breakers instead of air or oil.