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Introduction to Plasma Processing

Introduction to Plasma Processing. SF 6 Circuit Breaker Student: Hosny, Ahmed A. Instructor: Prof. Kasra Etemadi. Outline …. Introduction Why SF 6 Circuit Breakers? Advantages/Disadvantages How does it work? Applications Summary References. Introduction.

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Introduction to Plasma Processing

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  1. Introduction to Plasma Processing SF6 Circuit Breaker Student: Hosny, Ahmed A. Instructor: Prof. Kasra Etemadi

  2. Outline … • Introduction • Why SF6 Circuit Breakers? • Advantages/Disadvantages • How does it work? • Applications • Summary • References

  3. Introduction • What Kind of Plasma do we deal with?

  4. Introduction • What is Circuit Breakers (CBs)? • CB is one of the most essential safety mechanisms in electric networks. • Interrupt short circuit currents (~ 60kA, low pf ~ 0.1). • Fault clearance time is very important for power system stability and avoid equipment damage for itself and the rest of the network.

  5. Introduction (Cont.) • CBs types • Oil circuit breakers • Vacuum circuit breakers • Magnetic Air Circuit Breakers • Air-blast circuit breakers • SF6 circuit breakers Figure 2 SF6 partial interrupter unit.

  6. Advantages/Disadvantages? • SF6 has a dielectric strength of about two to three times that of air. • It is nontoxic. • It is nonflammable. • It is noncorrosive; it doesn’t react with other materials because it is inert gas. However, when it is heated to 5000C it decomposes and its decomposition products react with other materials. • It exhibits excellent properties for arc quenching. So, it used as an interrupting medium in circuit breakers instead of air or oil.

  7. Applications • Gas-insulated switchgear (GIS) Figure 3 GIS layout

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