As a rule of thumb, a conductor has an (self)inductance proportionally inverse with
it’s circumference (if fact the shortest way the magnetic field lines will take). Big flat conductors always perform better then round ones, as they have the highest circumference per kilo. Litz and silver(gold) coated conductors do contribute to the real part of the impedance (=resistance) properties only. Litz by increasing the conductive surfaces so reducing the resistance increase caused by the skin effect. Regards, Ing. Gert Gremmen [email protected] <mailto:[email protected]> www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. Van: [email protected] [mailto:[email protected]] Namens Fred Townsend Verzonden: Wednesday, November 04, 2009 11:02 PM Aan: [email protected] CC: [email protected] Onderwerp: Re: [PSES] Discharge capacitors Is this right? Not necessarily. Braid may or may not be hollow. Look at the braid frequently used for the battery ground lead on automobiles. Braid is frequently used for bonding large metals parts such as engine to body on your car. The ribbon referenced here is a single conductor. Sometimes I make them from sheets of copper or brass. They are not normally used where the environment contains motion or vibration. However they are ideal for making a mobius loop to non inductively feed the cathode of a high power transmitting tube. The term ribbon is not distinct and may include braided ribbons. [email protected] wrote: It is my understanding that the following terms apply. If not, please elaborate/correct. Braid - bare small gauge wires woven into a general hollow tube shape, intended to be used as shielding Ribbon - flat shape, multiple conductors insulated from each other, solid or [7? wires bare fibre wires?] to make each conductor. Solid Ribbon - flat shape, multiple conductors insulated from each other, solid wire conductors. Is this right? Robert Brian: I include braid in the category of ribbon without distinction. However braid is superior to solid ribbon for most applications because it is easier to work with. i.e. when connecting braid to a screw terminal I spread the braid out and slip the screw between (with flat or star washer) strands. It also has lower skin effect at RF frequencies. Solid ribbon must be crimped, drilled, or punched for screw terminals. The exception is solid ribbon is superior when using mobius loops. Silver braid is superior for RF but needs to be protected from corrosion to stay effective. I use ordinary tined braid for pulse generators. Regards, Fred Townsend Brian O'Connell wrote: For this particular application, how does the ribbon stuff compares to braided ground straps? I am about to build something similar, and would like to know if someone has already experimented with this. thanks, Brian -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Fred Townsend Sent: Wednesday, November 04, 2009 10:36 AM To: [email protected] Cc: [email protected]; [email protected] Subject: Re: [PSES] Discharge capacitors Derek : I think Orin offers good advice. You also need to pay attention to your network geometry. i.e. Inductance is your enemy. Two 10 uF caps in parallel are better than one 20 uF. Straight runs of ribbon wire are better than coils of round wire. Regards, Fred Townsend DC to Light [email protected] wrote: The usual suspects are NWL in North Carolina, CSI in California, and General Atomics (formerly Maxwell). They all know what they are doing and have low inductance pulse rated caps capable of multi-kiloamp discharge peaks. Orin Laney / Atwood Research On Wed, 4 Nov 2009 11:04:51 -0500 [email protected] writes: Good morning folks, I have been working on improving the quality of my lightning simulator and have come to the conclusion that I need better capacitors. Can anyone share their opinions on manufacturers and/or models that are appropriate. An offline response may be appropriate. Sincerely, Derek Walton L F Research - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> <mailto:[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> <mailto:[email protected]> Mike Cantwell <[email protected]> <mailto:[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> <mailto:[email protected]> David Heald: <[email protected]> <mailto:[email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
