R. Measures wrote:
> At the voltage normally present - c. 6kV-pk - corona seems unlikely.
Absolutely not! The initiation voltage for a corona discharge depends on the
charge density. In other words, the sharper the point, 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.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|