Mostly, corona is a fact of life - the voltage is higher than the damp air
around the conductor can insulate. The following link sums it up:
On Dec 4, 2007 5:58 PM, Kelly Johnson <firstname.lastname@example.org> wrote:
> This is something different. I think I'm talking about corona, but
> I'll let others comment.
> I have some HV lines nearby. I get static on all bands whenever it
> rains. The static stops within a few minutes after the rain stops. I
> can hear the static both on my amateur gear AND on the AM BC radio in
> my car. Most of the time those HV lines are quiet when I drive under
> them while listening to AM BC band, but when it rains those HV lines
> are very noisy.
> I just want to understand why this occurs.
> On 12/4/07, email@example.com
> <firstname.lastname@example.org> wrote:
> > I don't know a great deal about static induced directly by rain hitting
> > lines, but here in dusty, sooty, gritty,
> > San Diego County, I do know that the first rain of the season often
> > produces havok if it's 1/2 or less; all the filth on the insulators from
> > months of no rain makes an excellent electrical pathway when a little
> > sprinkle is added.
> > Matter of fact, it usually takes a good 1" downpour or so to really wash
> > the insulators well; until that happens, we get arcing, power surges,
> > outages occasionally, etc etc, and lots of QRN. The power co. does all
> > can to keep the insulators clean, but they never seem to be able to get
> > of them during the dry season, which is most of the time.
> > This is all I know of this sort of phenomenon.
> > -Lin/KJ6EF
> > At 09:23 AM 12/04/2007, you wrote:
> > >I've done some internet searches, but haven't found alot of useful
> > >information. Does anyone have some links to websites/pages that
> > >describe the phenomena of rain induced static due to rain on HV or MV
> > >powerlines. I've found a number of things talking about static caused
> > >by rain hitting an antenna. I'm not talking about this. I'm talking
> > >about rain hitting an HV or MV powerline?
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