-
8/11/2019 Circuit Breaker Components
1/14
Circuit Breaker Components
Capacitor
Resistors
Diodes
Switches
-
8/11/2019 Circuit Breaker Components
2/14
Capacitors--Specs
10KVDC
10uF
Small Size
Three sources
Plastic Capacitors Inc (USA)
Hi Volt Corporation (Ireland)
High Energy Corporation (USA)
-
8/11/2019 Circuit Breaker Components
3/14
Capacitors
Size is a function of Capacitance
Smaller capacitance, smaller volume
-
8/11/2019 Circuit Breaker Components
4/14
Possible to use smaller cap?
10uF gives a spike of 12kV for about
200msec
1uF gives a spike of 14kV for about100msec
Is this acceptable?
Try simulations with 5uF
-
8/11/2019 Circuit Breaker Components
5/14
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
suppression,
Voltage smoothing
Filters
-
8/11/2019 Circuit Breaker Components
6/14
Cap Comparison (cont)
Tolerances of 10%
Temperature ranges55C 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
-
8/11/2019 Circuit Breaker Components
7/14
Resistors--specs
1k resistance
10 Amps
10kVDC
10A*10kV=100kW!
100kW*1sec=27.77kWh
27.22kWh/3.6*10^6=7.7*10^-6 Joules
-
8/11/2019 Circuit Breaker Components
8/14
-
8/11/2019 Circuit Breaker Components
9/14
Resistors
Actual resistance value still undecided
Actual ratings not entirely clear, i.e. what
power ratings and energy ratings willsuffice for this
application.
Wait until design is more firm, test resistors
in lab
-
8/11/2019 Circuit Breaker Components
10/14
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
-
8/11/2019 Circuit Breaker Components
11/14
What we have
Capacitors
No problem
Switches
Will use vacuum switches for now
Looking into GTO
Diodes
Again, no problem
-
8/11/2019 Circuit Breaker Components
12/14
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
-
8/11/2019 Circuit Breaker Components
13/14
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 continuouscurrent
-
8/11/2019 Circuit Breaker Components
14/14
Whats next?
Build a low-voltage prototype
What we have
IGBT switches
Logic switch controller
What we need
Low voltage capacitor, resistors, diodes
