Re: transmission lines from transformer /was: First Light HELP

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

We use shielded 12 kV and 25 kV underground
distribution at work. The one thing we have to do
before we "play" with them is to discharge them. With
miles of cable, the insulation between the conductor
and the shield has a fair amount of capacitance, and
packs quite a charge. I doubt if that's a problem on a
short run though.

Adam


--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: DRIEBEN@xxxxxxxxxxxxxxx
>
> Ed, Drew,
>
>
>  > Original poster: Esondrmn@xxxxxxx
>  >
>  > Drew,
>  >
>  > Not sure about the HV cables hissing.  Do you
> have them laying on
>  > the
>  > cement?  What kind of wire are you using?  How
> close together are
>  > they?  I
>  > use RG213 with the outer jacket and ground sheath
> removed and the
>  > cables
>  > are sitting on 2 x 4s on the cement.
>
> Not sure that this is recomended but I use x-ray HV
> cables
> with the grounding sheaths intact and gronded at the
> mains
> ground at the pole transformer. They certainly don't
> hiss
> in this setup although this may be a NO-NO from an
> RF kick
> back stand-point?? I've heard that this type of
> setup also
> causes a "Blumline effect" which causes voltage
> levels to
> reach much higher than the output voltage of the
> transformer
> itself, but I have not had any pole pig transformers
> to even
> hiccup from running like this. One reason I do it
> this way
> is to stop the hissing and to make it safer if the
> lines are
> touched while energized. I know the electrical
> utility com-
> panies must use this method on all of their
> underground power
> lines. Any observation/comments from others on this
> matter
> are welcome....
>
>
> David Rieben
>
>
>