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Point of Waveform Closure

Team Rush. Point of Waveform Closure. Sponsored by:. Schweitzer Engineering Laboratories, Inc. Team Rush. Point of Waveform Closure. Team Andrew King Scott Henderson Mentor: Normann Fischer (SEL) Advisors: Joe Law, Richard Wall Consultant: Jared Mraz. Point of Waveform Closure.

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Point of Waveform Closure

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  1. Team Rush Point of Waveform Closure Sponsored by: Schweitzer Engineering Laboratories, Inc.

  2. Team Rush Point of Waveform Closure Team • Andrew King • Scott Henderson • Mentor: Normann Fischer (SEL) • Advisors: Joe Law, Richard Wall • Consultant: Jared Mraz

  3. Point of Waveform Closure Overview Purpose Need/Specs System Block Diagram Breakdown of Components Budget Plan/Schedule Priorities Team Rush

  4. Team Rush Point of Waveform Closure What’s the point? Transformer failure is expensive

  5. Team Rush Point of Waveform Closure Need • Bank of power electronics switches • Energize at any point in the voltage waveform • Three phase capability

  6. Team Rush Point of Waveform Closure Specifications • Microprocessor Control • Switches: withstand 400A peak • Control three phases

  7. Team Rush Point of Waveform Closure Specifications cont. • Zero detection circuit • System accuracy: within 500μs • Track voltage/current waveform Budget not to exceed $3000.00

  8. Team Rush Point of Waveform Closure Solution • Versatile microprocessor based system • Power electronics switches • Voltage and current monitoring

  9. Point of Waveform Closure Solution cont. Modular for each phase Less Risk Ease of troubleshooting More easily adaptable Team Rush

  10. Team Rush Point of Waveform Closure

  11. Team Rush Point of Waveform Closure 0 Cross Detection • Methods Explored: • Op-Amp Circuit • Comparator Circuit • Detection Through Software

  12. Point of Waveform Closure 0 Cross Detection Methods Explored: Op-Amp Circuit Effective in Testing Accuracy within 100-200μs Team Rush

  13. Point of Waveform Closure 0 Cross Detection Methods Explored: Comparator Circuit Less complicated than op-amp circuit Accuracy reported to 1-2μs Will test in near future Team Rush

  14. Point of Waveform Closure 0 Cross Detection Methods Explored: Detection Through Software Could require significant processor resources Build capability into processor, explore at a later date Team Rush

  15. Team Rush Point of Waveform Closure Microprocessor • Considered: • Rabbit • ARM • PSoC • Best Choice: • PSoC

  16. Point of Waveform Closure Microprocessor PSoC Capture and Compare Flexible Cheap Modularization Limited Risk Several available for experimentation Team Rush

  17. Team Rush Point of Waveform Closure PSoC • Programmable System On Chip • Mfg. by Cypress Semiconductor • Mixed signal array • 8-bit M8C microprocessor • 24 MHz clock speed • Analog and digital peripherals • Constructed based upon needs • Building block architecture • Programmed with C

  18. Team Rush Point of Waveform Closure Switching Device • Considered: • Triac • Thyristor(SCR) • SCR Modules • Best Choice: • IXYS SCR Module MCC-220

  19. Point of Waveform Closure Switching Device IXYS SCR Module MCC-220 Cheap Back to back package Easy to mount Price: $136 each Team Rush

  20. Team Rush Point of Waveform Closure SCR Gate Driver • Considered: • Enerpro • Applied Power Systems • Build it ourselves • Best Choice: • Enerpro--Single Phase SCR Firing Board

  21. Point of Waveform Closure SCR Gate Driver Enerpro--Single Phase SCR Firing Board Don’t have to build anything Fires two SCRs Possible source for 0 cross detection Instantaneous Inhibit/Enable Price: $269 each Team Rush

  22. Team Rush Point of Waveform Closure Heatsink • Considered: • Purchase • Non-utilized heat sink belonging to the U of I • Best Choice: • Non-utilized heat sink • Slightly oversized but will work • Price: Free

  23. Team Rush Point of Waveform Closure Mechanical Contactor • Cutler Hammer C25FNE350A • 3 Pole 50A contactor • 110-120V AC Coil • Price: appx. $200.00

  24. Point of Waveform Closure Current Measurement LEM HTFS 400-P/SP2 Isolated/Hall effect device Price: $47.00 each Team Rush

  25. Point of Waveform Closure Voltage Measurement LEM CV 3-500 Closed loop voltage transducer Price: currently unknown, approx. $70.00 Team Rush

  26. Team Rush Point of Waveform Closure PCBs • Two per Phase • Board 1--Processor/0 cross detect • Board 2—Sensor/Sensor Support • Price: Appx. $800

  27. Team Rush Point of Waveform Closure Budget • Initial Budget $3000 • SCRs (3) $408 • SCR Driver Boards (3) $810 • Contactor (1) $200 • Microprocessors (3) $450 • PCBs (6) $800 • Current Transducers (3) $150 • Voltage Measurement (3) $210 • Miscellaneous Equipment $100 • Total $3128 • Amount Over Budget$128

  28. Team Rush Point of Waveform Closure Plan/Schedule • Remainder of First Semester • Order all purchasable components* • Work with loaner PSoC processor • Construct SCR/Driver/Contactor • Continue work on 0 cross detection

  29. Team Rush Point of Waveform Closure Plan/Schedule • Second Semester • Design/Build integrated PCBs • Integrate Microprocessor • Complete/Test entire system • Write paper for WCPRC

  30. Team Rush Point of Waveform Closure Priorities (In order of importance) • 1) Single phase switch • 2) Priority 1—3 phase • 3) Testing • 4) Voltage/current monitoring • 5) Residual flux measurement

  31. Team Rush Point of Waveform Closure Any Questions? Andy King andrewking@vandals.uidaho.edu Scott Henderson scott.henderson@vandals.uidaho.edu http://seniordesign.engr.uidaho.edu/2007_2008/rush/

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