From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Official air breakdown voltage?
Date: Fri, 25 Nov 2005 19:53:13 -0700
Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
When accuracy is important in labs I think it's set up where climate
is controlled (stp and less than 5% humidity) and the electrode
diameter is 5-10x the spark length (as close as practical to 2
infinite planes). Also the DC voltage is raised gradually (forget
the exact rate, but nowhere near what would be considered impulse).
Not cheap and easy in MV ranges. I think those conditions are where
the 30kV/cm comes from. As you mentioned, change any of those by
even a small amount and you'll get lower breakdown voltages for a
given distance. The 25KV/inch figure varies widely, but a good
starting point for hobby level stuff where 50-foot+ discharges are
seldom encountered and high accuracy isn't needed.
Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, November 25, 2005 7:27 PM
Subject: Official air breakdown voltage?
Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>
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 )