RE: [PSES] Discharge capacitors

> -Original Message- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of ce- > test, qualified testing bv - Gert Gremmen > Sent: Friday, November 06, 2009 3:02 AM > To: m...@sfo.com; emc-pstc@LISTSERV.IEEE.ORG > Subject: RE: [PSES] Discharge capacitors >

Re: [PSES] Discharge capacitors

Thank you, filed away, and presently foundering on copies from Radov > Here are the references I used. > > Rakov & Uman are leaders in the field of lightning and most lightning > conferences will have Rakov on the committee. > > Lightning: Physics and Effects ~ Vladimir A. Rakov & Martin A. Uman >

Re: [PSES] Discharge capacitors

Robert Macy wrote: Excellent reply! Do you have a URL to get copies? Here are the references I used. Rakov & Uman are leaders in the field of lightning and most lightning conferences will have Rakov on the committee. Lightning: Physics and Effects ~ Vladimir A. Rak

Re: [PSES] Discharge capacitors

In message <1157.66.81.42.36.1257524245.squir...@cp01.sfo.com>, dated Fri, 6 Nov 2009, m...@sfo.com writes: > It's almost like once it is brought into existance, it doesn't go >away, one just moves it about. There is a law - Conservation of Energy. But it all ends up as heat, somewhere; it can

Re: [PSES] Discharge capacitors

Excellent reply! Do you have a URL to get copies? I said 'significant', not 'spectral bandwidth of energy' I assumed these frequencies were of interest, because coupling is increased, breakdown is more likely to occur, and I thought the goal was to make a connection system with broadband charact

RE: [PSES] Discharge capacitors

the environment. > > > > > > Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens Fred Townsend > Verzonden: Friday, November 06, 2009 11:52 AM > Aan: m...@sfo.com > CC: emc-pstc@LISTSERV.IEEE.ORG > Onderwerp: Re: [PSES] Discharge capacitors > > > > Robert

Re: [PSES] Discharge capacitors

Thank you for replying. For corona, round IS better. Rounding the edges of a ribbon cable are better than square shape. As empirical evidence, Molecularly 'rounding' is better. -- while at HP, silver plating *and* polishing the plating resulted in higher Q for the cavity resonators. You correc

Re: [PSES] Discharge capacitors

In message <4af43076.4020...@gmail.com>, dated Fri, 6 Nov 2009, Mick Maytum on Gmail writes: >Thus think current and the voltage the object develops ? not energy. It looks pretty energetic to me. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodga

Re: [PSES] Discharge capacitors

Actually OD of 0.70 is closer to matching the circumference. Plus, I anticipated that by rounding downwards, would tend to make the round tube have slightly higher inductance. For density calculations, the ratio of ribbon cross section area to tube cross section area is approx 0.55 Yes, you corr

Re: [PSES] Discharge capacitors

Thank you for your reply. You make a good point: the importance of matching 'design to function'. These analyses were purposely done on 'isolated' conductors, because the original intent was to make a conductor between two points - a lightning simulator. You make a great point in talking about t

Re: [PSES] Discharge capacitors

John Woodgate wrote: In message <4af40b5b.2020...@gmail.com> , dated Fri, 6 Nov 2009, Mick Maytum on Gmail writes: Also please be careful when talking about lightning energy - this can

Re: [PSES] Discharge capacitors

In message <4af40b5b.2020...@gmail.com>, dated Fri, 6 Nov 2009, Mick Maytum on Gmail writes: >Also please be careful when talking about lightning energy - this can >lead to dreadful statements like "The lightning protection system >diverts the lightning energy to earth". It doesn't, current ge

Re: [PSES] Discharge capacitors

Robert Macy wrote: Assuming most of lightning energy is significant between 1MHz to 100MHz, calculate each conductor's characteristics at 10MHz and at 100MHz using 2D finite element analysis. This is at variance with real lightning and the simulated li

RE: [PSES] Discharge capacitors

, think about the environment. Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens m...@sfo.com Verzonden: Friday, November 06, 2009 2:28 AM Aan: emc-pstc@LISTSERV.IEEE.ORG Onderwerp: RE: [PSES] Discharge capacitors Flat rectangular is NOT better than a round tube if each have the same

RE: [PSES] Discharge capacitors

6 F 31(0)104154953 Before printing, think about the environment. Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens Fred Townsend Verzonden: Friday, November 06, 2009 11:52 AM Aan: m...@sfo.com CC: emc-pstc@LISTSERV.IEEE.ORG Onderwerp: Re: [PSES] Discharge capacitors Robert

Re: [PSES] Discharge capacitors

Robert it is difficult to validate your models without knowing more about them but they are suspect when they fail to uphold empirically derived practice that has existed for longer than field solvers. You certainly stick your neck out when you say: "CONCLUSION: Round is always better." I can t

Re: [PSES] Discharge capacitors

In message <1937.66.81.215.25.1257470854.squir...@cp01.sfo.com>, dated Thu, 5 Nov 2009, m...@sfo.com writes: >solid ribbon copper conductor, 1 inch wide and 120 mils thick > copper tube, 0.75 inch outside diameter and 120 mils wall thickness > >The two circumferences are approximately the same. >

Re: [PSES] Discharge capacitors

The setup is rather artificial in that it compares isolated conductors. The situation flips around for proximal conductors due to proximity effect. Try modeling a coil with a foil winding versus round wire. Flat adjacent surfaces perform better than adjacent round ones because the current bunchi

RE: [PSES] Discharge capacitors

Flat rectangular is NOT better than a round tube if each have the same circumference. The round tube has lower inductance than a flat ribbon conductor of comparable circumference. Makes sense, because Nature abhors 'pointy' stuff. This statement is based upon a comparison analyzing the two struc

Re: [PSES] Discharge capacitors

In message <009901ca5e08$2fe497e0$8fadc7a0$@mcauley>, dated Thu, 5 Nov 2009, John McAuley writes: >Having mentioned using a defibrillator, I wonder what they use to dump >the charge? An SCR presumably. No, the patient. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk J

RE: [PSES] Discharge capacitors

e-mail to the originator From: ola...@juno.com [mailto:ola...@juno.com] Sent: 04 November 2009 20:31 To: john.mcau...@cei.ie Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Discharge capacitors You can get SCRs up to 7KV withstand, or you can stack them to get the voltage rating if you do

RE: [PSES] Discharge capacitors

c-pstc@LISTSERV.IEEE.ORG 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 yo

Re: [PSES] Discharge capacitors

In message <4af206be.8080...@skyskan.com>, dated Wed, 4 Nov 2009, Mike Mertinooke writes: >How would you classify Litz wire? As expensive? It doesn't have any low-inductance properties. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Ass

Re: [PSES] Discharge capacitors

-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Discharge capacitors Derek : I think Orin offers good advice. You also need to pay attention to your network geometry. i.e. Induc

Re: [PSES] Discharge capacitors OT

Cc: lfresea...@aol.com; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Discharge capacitors Derek : I think Orin offers good advice. You also n

Re: [PSES] Discharge capacitors

Cc: lfresea...@aol.com; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Discharge capacitors Derek : I think Orin offers good advice. You also need to pay attention to your network geometry. i.e. Inductan

Re: [PSES] Discharge capacitors

; >>I am about to build something similar, and would like to know if > someone > >> has already experimented with this. > >> > >>thanks, > >>Brian > >> > >>-Original Message- > >>From: emc-p...@ieee.org [mailto:emc-p...@

Re: [PSES] Discharge capacitors

>>Brian >> >>-Original Message- >>From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Fred >> Townsend >>Sent: Wednesday, November 04, 2009 10:36 AM >>To: ola...@juno.com >>Cc: lfresea...@aol.com; EMC-PSTC@LISTSERV.IEEE.ORG

RE: [PSES] Discharge capacitors

-Original Message- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of > ola...@juno.com > Sent: Wednesday, November 04, 2009 12:31 PM > To: john.mcau...@cei.ie > Cc: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] Discharge capacitors > > You can

Re: [PSES] Discharge capacitors

emc-p...@ieee.org] On Behalf Of > Brian > O'Connell > Sent: 04 November 2009 18:43 > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: RE: [PSES] Discharge capacitors > > For this particular application, how does the ribbon stuff compares > to > braided ground

Re: [PSES] Discharge capacitors

In message <4af1d2cf.40...@sbcglobal.net>, dated Wed, 4 Nov 2009, Fred Townsend writes: >Silver braid is superior for RF but needs to be protected from >corrosion to stay effective. Have the audiophool suppliers missed out on supplying gold-plated braid? -- OOO - Own Opinions Only. Try www.jm

Re: [PSES] Discharge capacitors

nted with this. > >thanks, >Brian > >-Original Message- >From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Fred Townsend >Sent: Wednesday, November 04, 2009 10:36 AM >To: ola...@juno.com >Cc: lfresea...@aol.com; EMC-PSTC@LISTSERV.IEEE.ORG >Subject:

RE: [PSES] Discharge capacitors

43 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Discharge capacitors 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

RE: [PSES] Discharge capacitors

...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Brian O'Connell Sent: Wednesday, November 04, 2009 11:43 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Discharge capacitors For this particular application, how does the ribbon stuff compares to braided ground straps? I am about to build some

RE: [PSES] Discharge capacitors

Townsend Sent: Wednesday, November 04, 2009 10:36 AM To: ola...@juno.com Cc: lfresea...@aol.com; EMC-PSTC@LISTSERV.IEEE.ORG 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

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 ola...@juno.

Re: [PSES] Discharge capacitors

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 lfresea..