On Mar 17, 2005, at 12:47 PM, Vic Rosenthal wrote:
> R. Measures wrote:
>
>> At the voltage normally present - c. 6kV-pk - corona seems unlikely.
>
> Absolutely not!
I have a high-pot tester and here at 120m above sea level I do not see
corona at 6kV.
> The initiation voltage for a corona discharge depends on the charge
> density. In other words, the sharper the point,
Somewhat, but this amplifier does not have sharp points.
> the lower the voltage needed to start the corona. I know that
> switchgear for power systems operating as low as 2-4 KV is designed to
> avoid sharp points for this reason.
>
> Once the corona starts, the ionized air in the vicinity reduces the
> breakdown voltage necessary to start an actual arc. This explains how
> you can have arcs over what appear to be large air gaps in things like
> bandswitches.
Bandswitches with needle points should be avoided.
>
> --
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
>
>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|