Re: PIG failure modes

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

Can't comment on faiure modes, but my 14.4/25 has a
BIL rating of 125 kV.

http://www.hot-streamer.com/adam/garage/pig_14.4kV_25kVA_3.jpg

and my little 14.4/1.5 PT has a BIL of 110 kV.

http://www.hot-streamer.com/adam/garage/pt_14.4kV_1.5kVA_2.jpg

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "Gerry  Reynolds"
> <gerrytesla@xxxxxxx>
>
> Hi Dr R.
>
> I'm trying to get a feel for PIG failure modes and
> I'm guessing that the
> one you are refering to below is overvoltage due to
> length dependent
> resonances that can result when shielded coax is
> used to route power from
> the PIG to the TC and the system is underdamped.  DO
> you or ANYONE else
> know if a PIG will be damaged by voltages less than
> the BIL rating.  I have
> a 5KVA pig that has the following ratings (but no
> BIL rating):
>
> LV: 120/240
> HV: 14400/24940
>
> Im presuming the 24940V refers to an application
> where the pig is connected
> across two phases of a Y three phase distribution
> system where each leg of
> the Y is 14400V and sees 24940 volts across its HV
> bushings. If this is
> true,  this would suggest to me that operating the
> pig in a TC SRSG system
> at 25000V would be no problem for the pig (assuming
> the temp rise spec of
> 65 degrees C is honored and the KVA rating isn't
> violated too
> excessively).  If someone could elaborate more on
> PIG failure modes, I
> would be grateful.
>
> Gerry R
>
> BTW:  I got a new email address dedicated to this
> tesla group
> (gerrytesla@xxxxxxx)
>
> >Original poster: "Dr. Resonance"
> <resonance@xxxxxxxxxx>
> >
> >
> >Don't do this --- you could blow your pig with a
> cap at the other end!!!
> >
> >Dr. Resonance
> >
> > >
> > >  > 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
> > >
> > >
> > >
> >
> >
>
>
>
>