| Author |
Which material has the highest-breakdown voltage and ohms?
|
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| Radium 2007-05-16, 5:25 pm |
| Hi:
Which material has the highest breakdown voltage and electrical
resistance?
Can this material block the flow of lightning's megavolts?
Does a material with more ohms necessarily have a higher breakdown
voltage than a material with fewer ohms?
How about the converse? Does a material with a higher breakdown
voltage necessarily have more ohms than a material with a lower
breakdown voltage?
Thanks,
Radium
| |
| Palindrome 2007-05-16, 8:25 pm |
| Radium wrote:
> Hi:
>
> Which material has the highest breakdown voltage and electrical
> resistance?
You probably mean highest dielectric strength.
"PBN exhibits extremely high electrical resistivity (yet is uniquely
combined with good directional thermal conductivity) and the highest
dielectric strength of any commercially available material."
Dielectric Strength of 200kV per mm
>
> Can this material block the flow of lightning's megavolts?
You bet.
>
> Does a material with more ohms necessarily have a higher breakdown
> voltage than a material with fewer ohms?
Not necessarily
>
> How about the converse? Does a material with a higher breakdown
> voltage necessarily have more ohms than a material with a lower
> breakdown voltage?
Not necessarily.
--
Sue
| |
| Salmon Egg 2007-05-16, 8:25 pm |
| Ink on paper.
9^999999999999999999999999999999999999999999999999999999999999999999999999
ohms but only
9^999999999999999999999999999999999999999999999999999999999999999999999998
volts.
| |
| Don Kelly 2007-05-16, 9:25 pm |
| Possibly you should learn something about high voltage and breakdown. After
you have learned the basics, then come back with (possibly) more intelligent
questions.
--
Don Kelly dhky@shawcross.ca
remove the X to answer
----------------------------
"Radium" <glucegen1@gmail.com> wrote in message
news:1179353482.746968.256310@k79g2000hse.googlegroups.com...
> Hi:
>
> Which material has the highest breakdown voltage and electrical
> resistance?
>
> Can this material block the flow of lightning's megavolts?
>
> Does a material with more ohms necessarily have a higher breakdown
> voltage than a material with fewer ohms?
>
> How about the converse? Does a material with a higher breakdown
> voltage necessarily have more ohms than a material with a lower
> breakdown voltage?
>
>
> Thanks,
>
> Radium
>
| |
| Salmon Egg 2007-05-17, 3:25 am |
| On 5/16/07 7:08 PM, in article 6OO2i.189635$6m4.2426@pd7urf1no, "Don Kelly"
<dhky@shaw.ca> wrote:
> Possibly you should learn something about high voltage and breakdown. After
> you have learned the basics, then come back with (possibly) more intelligent
> questions.
>
> --
>
> Don Kelly dhky@shawcross.ca
> remove the X to answer
> ----------------------------
> "Radium" <glucegen1@gmail.com> wrote in message
> news:1179353482.746968.256310@k79g2000hse.googlegroups.com...
>
>
Don,
You are missing the point. This Ra guy is just trying to infuriate us, and
he is succeeding.
-- Fermez le Bush--about two years to go.
| |
| Bob Parker 2007-05-17, 3:25 am |
| On 17/05/2007 08:11 Radium wrote:
> Hi:
>
> Which material has the highest breakdown voltage and electrical
> resistance?
>
> Can this material block the flow of lightning's megavolts?
>
> Does a material with more ohms necessarily have a higher breakdown
> voltage than a material with fewer ohms?
>
> How about the converse? Does a material with a higher breakdown
> voltage necessarily have more ohms than a material with a lower
> breakdown voltage?
>
>
> Thanks,
>
> Radium
>
plonk
| |
| Eric Gisse 2007-05-17, 3:25 am |
| On May 16, 3:11 pm, Radium <gluceg...@gmail.com> wrote:
> Hi:
>
> Which material has the highest breakdown voltage and electrical
> resistance?
>
> Can this material block the flow of lightning's megavolts?
>
> Does a material with more ohms necessarily have a higher breakdown
> voltage than a material with fewer ohms?
>
> How about the converse? Does a material with a higher breakdown
> voltage necessarily have more ohms than a material with a lower
> breakdown voltage?
>
> Thanks,
>
> Radium
Why don't you do some research?
| |
| Radium 2007-05-17, 3:25 am |
| On May 16, 3:27 pm, Palindrome <m...@privacy.net> wrote:
> Radium wrote:
[color=darkred]
>
[color=darkred]
> You probably mean highest dielectric strength.
>
> "PBN exhibits extremely high electrical resistivity (yet is uniquely
> combined with good directional thermal conductivity) and the highest
> dielectric strength of any commercially available material."
>
> Dielectric Strength of 200kV per mm
Okay.
>
> You bet.
Are you sure? You're saying that PBN has enough dielectric strength to
block out lightning? PBN can block millions of volts? Sounds too good
to be true.
[color=darkred]
> Not necessarily
Okay.
[color=darkred]
> Not necessarily.
How do ohms and dielectric strength relate? Is their an equation?
| |
| Fun Tyme 2007-05-17, 3:25 am |
| Radium wrote:
>
> How do ohms and dielectric strength relate? Is their an equation?
>
.....EASY :-
Reading + study + time - smoking dope = knowledge. This knowledge
then qualifies one to ask relevant questions
Someone suggested "crawl before you run", this is sage advice.
| |
| Beachcomber 2007-05-17, 3:25 am |
| On 16 May 2007 21:49:19 -0700, Eric Gisse <jowr.pi@gmail.com> wrote:
>On May 16, 3:11 pm, Radium <gluceg...@gmail.com> wrote:
>
>Why don't you do some research?
>
Practically speaking... Blocking lightning with an insulator is
difficult, if not impossible. The charge levels can be on the order
of billions of volts and the lightning is going to go somewhere.
Therefore, most, if not all, lightning protection schemes use
conductors, cages, cables, wires, sheet metal and attempt to safely
discharge the current into the ground and divert it from what you want
to protect.
Example, let's say you are driving a car through a thunderstorm.
You're going to generally be safer inside a car with a metal top, than
in a convertable with a non-conductive top, no matter how good an
insulator the roof of the car is made of.
Another example - Skyscrapers in storm areas can get struck hundreds
of times per year, yet the people who work or live in them are much
safer than people just walking around outside. You are generally
going to be surrounded by a conductive steel enclosure and be in
perfect safety.
| |
| David L. Jones 2007-05-17, 3:25 am |
| On May 17, 8:11 am, Radium <gluceg...@gmail.com> wrote:
> Hi:
>
> Which material has the highest breakdown voltage and electrical
> resistance?
>
> Can this material block the flow of lightning's megavolts?
>
> Does a material with more ohms necessarily have a higher breakdown
> voltage than a material with fewer ohms?
>
> How about the converse? Does a material with a higher breakdown
> voltage necessarily have more ohms than a material with a lower
> breakdown voltage?
>
> Thanks,
>
> Radium
You need to talk in terms of Dielectric Strength.
http://en.wikipedia.org/wiki/Dielectric_strength
Ceramics are one of the highest, they are used as the insulators on HV
power lines.
Look at a power pole and take note of the shape of the ceramic
insulators, they are this shape because the air around the insulator
will break down before the insulator will.
Dave.
| |
| phil-news-nospam@ipal.net 2007-05-17, 9:25 am |
| In alt.engineering.electrical Radium <glucegen1@gmail.com> wrote:
| Are you sure? You're saying that PBN has enough dielectric strength to
| block out lightning? PBN can block millions of volts? Sounds too good
| to be true.
At 200kV/mm a few meters thickness of this stuff should work for you.
The catch is that if the lightning strike does happen, even though the
electrical voltage won't go through, the heat emitted from the arc
could damage the material and the next strike will getcha!
--
|---------------------------------------/----------------------------------|
| Phil Howard KA9WGN (ka9wgn.ham.org) / Do not send to the address below |
| first name lower case at ipal.net / spamtrap-2007-05-17-0740@ipal.net |
|------------------------------------/-------------------------------------|
| |
| Uncle Al 2007-05-17, 9:25 am |
| Radium wrote:
>
> Hi:
>
> Which material has the highest breakdown voltage and electrical
> resistance?
>
> Can this material block the flow of lightning's megavolts?
>
> Does a material with more ohms necessarily have a higher breakdown
> voltage than a material with fewer ohms?
>
> How about the converse? Does a material with a higher breakdown
> voltage necessarily have more ohms than a material with a lower
> breakdown voltage?
Shitanium Illudium Phosdexate prepared as an incommensruate modulated
crystal lattice has a normalized specific dearcation index of
1.61803. That is the highest normalized specific index there is - by
almost 62% relative.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
| |
|
| On May 16, 5:11 pm, Radium <gluceg...@gmail.com> wrote:
> Hi:
>
> Which material has the highest breakdown voltage and electrical
> resistance?
>
> Can this material block the flow of lightning's megavolts?
>
> Does a material with more ohms necessarily have a higher breakdown
> voltage than a material with fewer ohms?
>
> How about the converse? Does a material with a higher breakdown
> voltage necessarily have more ohms than a material with a lower
> breakdown voltage?
>
> Thanks,
>
> Radium
It's easier to block lightning with a *conductor* than with a
dielectric shield. Google "Faraday cage" and "lightning rod".
Also note that lightning has no real need to travel in a straight line
from A to B. It will usually take the path of least resistance, which
might be somewhat straight, as long as there isn't a sheet of
dielectric in the way. But if there is a path *around* the dielectric
sheet that is lower resistance, then it will certainly take that
route.
Finally, note that people have been electrocuted standing 100 ft or
more away from the tree that lightning struck, as the current
*continued* traveling through the ground.
PD
| |
| Don Kelly 2007-05-18, 3:25 am |
| I'm not infuriated. It is really quite asinine so one doesn't know whether
to laugh or cry.
Thanks
--
Don Kelly dhky@shawcross.ca
remove the X to answer
----------------------------
"Salmon Egg" <salmonegg@sbcglobal.net> wrote in message
news:C271256F.783A3%salmonegg@sbcglobal.net...
> On 5/16/07 7:08 PM, in article 6OO2i.189635$6m4.2426@pd7urf1no, "Don
> Kelly"
> <dhky@shaw.ca> wrote:
>
> Don,
>
> You are missing the point. This Ra guy is just trying to infuriate us, and
> he is succeeding.
> -- Fermez le Bush--about two years to go.
>
>
| |
| Alan Rutlidge 2007-05-18, 9:25 am |
|
"Uncle Al" <UncleAl0@hate.spam.net> wrote in message
news:464C6550.E8B2BF40@hate.spam.net...
> Radium wrote:
>
> Shitanium Illudium Phosdexate prepared as an incommensruate modulated
> crystal lattice has a normalized specific dearcation index of
> 1.61803. That is the highest normalized specific index there is - by
> almost 62% relative.
>
>
> --
> Uncle Al
> http://www.mazepath.com/uncleal/
> (Toxic URL! Unsafe for children and most mammals)
> http://www.mazepath.com/uncleal/lajos.htm#a2
ROFL - the best answer I've read yet. :-)
| |
|
| On Thu, 17 May 2007 07:23:12 -0700, Uncle Al <UncleAl0@hate.spam.net> wrote:
>Radium wrote:
>
>Shitanium Illudium Phosdexate prepared as an incommensruate modulated
>crystal lattice has a normalized specific dearcation index of
>1.61803. That is the highest normalized specific index there is - by
>almost 62% relative.
What, the shaving cream atom?
| |
| The Ghost In The Machine 2007-05-19, 5:25 pm |
| In sci.physics.relativity, Uncle Al
<UncleAl0@hate.spam.net>
wrote
on Thu, 17 May 2007 07:23:12 -0700
<464C6550.E8B2BF40@hate.spam.net>:
> Radium wrote:
>
> Shitanium Illudium Phosdexate prepared as an incommensruate modulated
> crystal lattice has a normalized specific dearcation index of
> 1.61803. That is the highest normalized specific index there is - by
> almost 62% relative.
>
And it can be used to blow up the Earth, in case it obstructs anyone's
view of Venus.
:-)
--
#191, ewill3@earthlink.net
"Your mother was a hamster and your father smelt of
elderberries!" - Monty Python and the Holy Grail
--
Posted via a free Usenet account from http://www.teranews.com
| |
| daestrom 2007-05-21, 5:25 pm |
|
<phil-news-nospam@ipal.net> wrote in message
news:f2hiih317cp@news4.newsguy.com...
> In alt.engineering.electrical Radium <glucegen1@gmail.com> wrote:
>
> | Are you sure? You're saying that PBN has enough dielectric strength to
> | block out lightning? PBN can block millions of volts? Sounds too good
> | to be true.
>
> At 200kV/mm a few meters thickness of this stuff should work for you.
> The catch is that if the lightning strike does happen, even though the
> electrical voltage won't go through, the heat emitted from the arc
> could damage the material and the next strike will getcha!
>
And depending on the geometry, you can get surface tracks along the surface,
around the edges. Stopping high voltage is more then just the dielectric
strength.
That's why high voltage bushings have the shape they do. To increase the
path length along the surface of the insulators.
daestrom
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