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Circuit Breaker Components

Circuit Breaker Components . Capacitor Resistors Diodes Switches. Capacitors--Specs . 10KVDC 10uF Small Size Three sources Plastic Capacitors Inc (USA) Hi Volt Corporation (Ireland) High Energy Corporation (USA). Capacitors. Size is a function of Capacitance

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Circuit Breaker Components

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  1. Circuit Breaker Components • Capacitor • Resistors • Diodes • Switches

  2. Capacitors--Specs • 10KVDC • 10uF • Small Size • Three sources • Plastic Capacitors Inc (USA) • Hi Volt Corporation (Ireland) • High Energy Corporation (USA)

  3. Capacitors • Size is a function of Capacitance • Smaller capacitance, smaller volume

  4. Possible to use smaller cap? • 10uF gives a spike of 12kV for about 200msec • 1uF gives a spike of 14kV for about 100msec • Is this acceptable? • Try simulations with 5uF

  5. Capacitor Comparison

  6. Cap Comparison (cont) • Tolerances of ±10% • Temperature ranges –55C to 85C • Prices (based on purchase of 100-150 units) • Plastic Caps range from $112 for 1uF to $493 for 10uF • Hi Volt prices at £70 fro 1uF and 4uF

  7. Resistors--specs • 1kΩ resistance • 10 Amps • 10kVDC • 10A*10kV=100kW! • 100kW*1sec=27.77kWh • 27.22kWh/3.6*10^6=7.7*10^-6 Joules

  8. Resistors—what I found • Most resistors very small or very large • Most resistors rated in KW range are very large size and impractical for our purposes • High voltage resistors are rated for low wattage and high energy • Ex. Kanthal Globar 106AS resistor 15kV, 35A, 13W, 1900J

  9. Resistors • Actual resistance value still undecided • Actual ratings not entirely clear, i.e. what power ratings and energy ratings will suffice for this application. • Wait until design is more firm, test resistors in lab

  10. Resistors (cont) • Manufacturers • Kanthal Globar • Resistors designed for short pulses • $43-$73 range per resistor (based on small order) • Sizes from 2”-6” in length • Nicrom Ticino • Power resistors • $55-$75 range • 2”-6” length • Tepro • Will build to our specs, 400mm in length

  11. What we have • Capacitors • No problem • Switches • Will use vacuum switches for now • Looking into GTO • Diodes • Again, no problem

  12. Diodes • Need 10A, 10kV Vrrm • Found 10-20A, 1000-1600Vrrm • Can cascade in series • International Rectifier • Two types • Plastic casing, $1.26-$1.68ea • Metal casing $3.72-$3.84ea • Both about 1.25” in length • Neither immersable in transformer oil

  13. Switches • Possible options • Vacuum switches • Durable, long lasting • Require continuous signal while closed • 3.25” long, 0.65” wide • GTO switches • Turn on signal, turn off signal, but no continuous current

  14. What’s next? • Build a low-voltage prototype • What we have • IGBT switches • Logic switch controller • What we need • Low voltage capacitor, resistors, diodes

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