[SI-LIST] Re: breakdown voltage (arching) equation
- From: John Wilson <jmwilson@xxxxxxxxxxxx>
- To: gustavo.duenas@xxxxxxxxxxx
- Date: Tue, 04 Nov 2003 16:17:31 -0500
I am not sure about your exact application, but if you are working at small
dimensions in air (or another gas) you should consider Paschen's Curve.
In a nutshell the macro scale values do not apply for breakdown in gases (i.e.
air or the gas in your favorite tube) when the dimensions are small. As I
recall for air the minimum breakdown is 327 Volts and occurs at 7.5um.
The macro scale value for air is something like 3 million Volts per meter.
Which would lead you to believe that a 7.5um air gap would spark at 22.5 Volts.
If you are interested you go to Google and search for "Paschen's Curve".
john wilson
gustavo.duenas@xxxxxxxxxxx wrote:
> Hello all ,
>
> Does anyone know of an equation that relates breakdown voltage (arching) vs
> distance in a given dielectric medium, metal types ,etc?
> I looked in Henry Ott's book but did not find an equation.
>
> Thanks in advance,
>
> Gus
>
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