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Team Members Surabhi Gupta EE Alfredo Flores EE Brian Saitta EE

outline. 2. Introduction Project Statement and Deliverables Project Specifications System Background Circuit Breaker Design and Operation Areva Air Blast GCB Example Possible Vendors Goals and Work Accomplished Timeline

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Team Members Surabhi Gupta EE Alfredo Flores EE Brian Saitta EE

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    1.   Team Members   Surabhi Gupta – EE Alfredo Flores – EE Brian Saitta – EE 1

    2. outline 2

    3. Project Statement Create a Design Package for the installation of a Main Generator Output Breaker for Unit 2 3

    4. Deliverables Complete Bid Specifications document Complete review process Suggest list of bidders document Include marked up: Schematics Electrical one line/three line diagrams 4

    5. Project Specifications Electrical Parameters Rated Nominal Voltage: 24 kV rms Max. System Voltage: 26.4 kV rms Rated Frequency: 60 Hz Rated Continuous Current: 26,600 A rms Rated Short-Time Withstand Current: 270,000 A rms (1s) Ambient Conditions Temperature, humidity, etc. 5

    6. Future design of unit 2 6

    7. Levels of Circuit Breakers We are concerned with the High Voltage type based on our current rating of 26.6 kA

    8. Types of High-Voltage Circuit Breakers GCB’s are classified by their arc extinguishing capabilities We’re considering SF6 and Air Blast

    9. Operation of SF6 and Air-Blast Circuit Breaker Three main parts of operation: Mechanism for extinguishing arc current SF6/Air Opening and closing of contacts Contacts are controlled by solenoids and external current sensing circuitry Cooling during operation Fans/Cooling Turbines

    10. Advantages of Air-Blast Circuit Breaker Good insulation quality Costs nothing The risk of fire is eliminated The arcing time is very small Suitable for frequent operation

    11. Advantages of SF6 Circuit Breaker Excellent insulating properties Remarkable arc quenching abilities Very short arcing time Odorless, colorless, nonflammable Non-toxic Dielectric strength is 3 times the air's dielectric

    12. Areva PKG Air Blast GCB Example Meets our requirements Designed specifically for nuclear facilities Strongly considering

    13. Areva PKG Air Blast Design Main Chamber releases compressed air when contacts are pulled apart A few milli-seconds after main chamber opens, the auxiliary chamber releases air to both fixed and mobile contacts extinguishing resistive currents. Fans on top of poles maintain the required temperature

    14. VENDORS Contacted Vendors Mitsubishi AE Power GE AREVA New Possible Vendors ABB Cutler-Hammer (Eaton) Siemens Toshiba Schneider-Electric

    15. Work Accomplished Wrote the beginning stages of the Bid Spec. Contacted Vendors and started Bidder List Started analyzing control circuitry and logic for GCB Received training in reading drawings and schematics Future Goals Continue writing Bid Spec. Finalize Bidders list Continue to analyze associated schematics/drawings Continue Research about GCB’s 15

    16. timeline 16

    17. budget Dominion is looking to spend just under a million dollars Our expenses include Fuel prices Phone calls to Vendors Lots of Coffee/Pizza etc. 17

    18. Conclusion Vendors Design Work Incorporating the right product into a pre-existing system Modifications Learn all aspects of GCB’s

    19. references 19

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