{Collins} Re: Stancor P6454 2.5 VCT 10AMP HV Filament Transformer for KWS-1



Hi Otto, ... Only if you are darn sure you have
discharged the 4 micr. capacitor. ... Hi Hi



--- Ottavio Carmelo <ocarmelo@xxxxxxxxxx> wrote:

> HH, Do the saftey rules that you have outlined apply
> to when the AC plug 
> is disconnected from the wall outlet?
> 
> Otto KC2KKP
> 
> 
> 
> H H <relichuntercw@xxxxxxxxx> 
> Sent by: collins-bounce@xxxxxxxxxxxxxxxxxxxxx
> 01/28/2005 06:50 PM
> Please respond to
> relichuntercw
> 
> 
> To
> kmarshall1@xxxxxxxxxxxxxx
> cc
> Collins Listserve <collins@xxxxxxxxxxxxx>
> Subject
> {Collins} Re: Stancor P6454 2.5 VCT 10AMP HV
> Filament Transformer for 
> KWS-1
> 
> 
> 
> 
> 
> 
> Dale, .. In a way I agree with you but I and others
> need to go by certain rules and they are always put
> one hand in your pocket before reaching into a high
> voltage power supply. Never do it bare footed.
> Expect
> all surfaces to be hot with voltages before reaching
> in. And last but not least, .. never but never reach
> into a high voltage power supply while it is
> energized. I learned these simple rules while
> working
> for Alabama Power Co. for 17 years and living to
> retire. .. My choke and filament transformer cores
> are
> currently grounded but I am considering raising them
> above ground to hopefully prevent future problems
> with
> them. .. 
> 
> 
> 
> --- kmarshall1 <kmarshall1@xxxxxxxxxxxxxx> wrote:
> 
> > Dale:
> > 
> > I hope this doesn't degenerate into nitpicking,
> but
> > taking the transformer 
> > and mounting on a plastic base where the frame is
> > NOT grounded removes 
> > electrical stress on the dielectric (insulation)
> > from ALL conductors to the 
> > core, etc.   That makes it much less likely for
> the
> > insulation from 
> > conductors to frame to fail in the first place. 
> The
> > stress from conductor 
> > system (primary, secondary, etc.) to conductor
> > system will not change, nor 
> > from turn to turn.  However, one complete  major
> > "subsystem" of insulation 
> > (conductors to frame) will no longer be stressed. 
> > Is that significant?
> > 
> > I've seen (and so have bunches of other people
> seen)
> > whole decks in 
> > transmitters (and other devices) where stuff is
> > significantly (and 
> > deliberately) raised above chassis ground.
> > 
> > My point is that the stress from conductors to
> > conductors will be the same 
> > in both cases, i.e., whether the core steel/frame
> is
> > grounded or not.  As 
> > noted before, and agreed to before, if there IS a
> > short to the core, it is 
> > much safer to have the core grounded, because IN
> > THIS CASE everyone expects 
> > the transformer core to NEVER carry a potential,
> > where the "transmitter 
> > deck" case above is designed into the equipment,
> and
> > documented as such.
> > 
> > What's more to say about this?
> > 
> > 
> > Kent W5TXV
> > 
> > 
> > ----- Original Message ----- 
> > From: <dgsvetan@xxxxxxxxxxxxxxxxxxx>
> > To: <kmarshall1@xxxxxxxxxxxxxx>;
> > <pdulaff@xxxxxxxxxxxxx>; 
> > <Scott.Freeberg@xxxxxxxxxxx>
> > Cc: <collins@xxxxxxxxxxxxx>
> > Sent: Friday, January 28, 2005 11:14 AM
> > Subject: {Collins} Re: Stancor P6454 2.5 VCT 10AMP
> > HV Filament Transformer 
> > for KWS-1
> > 
> > 
> > > All,
> > >
> > > Guys, don't forget that there is a winding
> called
> > "primary".  That winding
> > > is connected to the AC power line, which has a
> > "hot" and a "neutral".  If
> > > done properly, the neutral is at or near ground.
> 
> > The HV can arc/short to
> > > EITHER the primary or the frame, depending upon
> > where the breakdown of the
> > > seconday side insulation occurs.  Personally, I
> > vastly prefer the metal
> > > mount because that hard grounds the frame.  The
> > stress on the xfmr
> > > insulation is about the same either way because
> of
> > the primary's 
> > > connection
> > > to ground via neutral.  By grounding the frame,
> > that is one less
> > > potentially lethal problem reduced.
> > >
> > > 73, Dale
> > > WA9ENA
> > >
> > >
> > >
> > >
> > >
> > >             "kmarshall1"
> > >             <kmarshall1@houst
> > >             on.rr.com> 
> >                     To
> > >             Sent by: 
> > <Scott.Freeberg@xxxxxxxxxxx>
> > >             collins-bounce@ma 
> >                     cc
> > >             ilman.listserve.c 
> > <pdulaff@xxxxxxxxxxxxx>,
> > >             om 
> > "Collins@Listserve. Com"
> > > 
> > <collins@xxxxxxxxxxxxx>
> > > 
> >                Subject
> > >             01/28/2005 10:43          {Collins}
> > Re: Stancor P6454 2.5 VCT
> > >             AM                        10AMP HV
> > Filament Transformer for
> > >                                       KWS-1
> > >
> > >             Please respond to
> > >             kmarshall1@housto
> > >                 n.rr.com
> > >
> > >
> > >
> > >
> > >
> > >
> > > Scott:
> > >
> > > The other side of the argument about whether to
> > mount the transformer on a
> > > plastic base or on a metallic base is not
> > necessarily obvious.  If the
> > > transformer is mounted on a plastic sheet, with
> > the transformer frame
> > > "floating" above ground, the electrical stress
> on
> > the transformer
> > > dielectric
> > > system will be very low, and a break in the
> > insulation would be highly
> > > unlikely to ever occur in the first place. 
> Should
> > that happen, however,
> > > the
> > > transformer metal would go to the high voltage
> > state which was mentioned.
> > >
> > > The real question is one of safety, however, and
> > grounding the frame is
> > > easily the more safe.
> > >
> > > As has been stated on this reflector previously
> 
=== message truncated ===



	
		
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