[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Official air breakdown voltage?
Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>
There is a "very official" way. Up until recently, high voltages
were "officially" measured with ball sparks gaps since that is all
that worked scientifically and repeatably. A pretty official chart is here:
3MV/Meter is also almost a "standard" value...
Problem is, voltage fields stretch, bend, and distort.... So given a
particular situation, figuring out the breakdown voltage can get
super messy!!! There are fancy computer programs that can do it
pretty well but it takes like an EE degree to run them... Some Ph.D
folks can do it on paper... The functions are NOT straight lines at
lower (~10kV) voltages either....
But all that is for "DC"...... With "AC", we can cut arc channels
through the air and spoil all the those rules anyway. It still can
be figures out buy some high voltage AC gurus, but it is getting to
the technical nightmare level at that point. Over the decades, Tesla
coilers have made "rules" based on observations like John Freau's
formula that get "us" through without too much brain damage.
So for DC, the chart above does well.... (It works OK for 60Hz stuff
too) There are some "rules of thumb" out there.... Beyond that,
there are very messy methods only a few can figure out. Beyond that,
the answer is pretty close to NO....
At 12:51 PM 11/25/2005, you wrote:
I have read all over the net, around 25KV/inch <<I use this one
I read on one place, around 30KV/inch
Now i have just been told around 30KV / cm !!!! Thats 3 times
the voltage I have been told
It is common sense that air pressure, humididty, current, and time
of day all affect air breakdown voltage, but:
IS there any official way to determine exactly what air breakdown
voltage is? ( such as KV/distance )