Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
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 – Smaller capacitance, smaller volume 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 Capacitor Comparison Plastic Caps Hi Volt High Energy materials Sealed military can, Solder-seal terminals Tinplate case, Ceramic terminals Enamel finish Plated steel, epoxy finish Impregnant Mineral oil Mineral oil Mineral oil Applications Storage/dischage, high current low repetiton Arc and spark Filters suppression, Voltage smoothing 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 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 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 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 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 What we have • Capacitors – No problem • Switches – Will use vacuum switches for now – Looking into GTO • Diodes – Again, no problem 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 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 What’s next? • Build a low-voltage prototype • What we have – IGBT switches – Logic switch controller • What we need – Low voltage capacitor, resistors, diodes