[Amps] Rectifier diode strings

[Gary Schafer]

Don't forget that the transformer core will also saturate with high
voltage spikes and will not get through to the secondary. Depends on the
transformer. Some will saturate with voltage not to far over the designed
operation level.

73
Gary  K4FMX


Richard wrote:

> >What's protecting the primary winding
> >insulation??
>
> The waveshapes on the primary and the secondary a transformer are
> virtually identical.  Suppress transients on one, and the job is done.
>
> cheers, Paul
> >
> >PAUL HEWITT
> >WD7S PRODUCTIONS
> >QRO HOMEBREW COMPONENTS
> >http://wd7s.home.att.net
> >
> >
> >> -----Original Message-----
> >> From: Richard
> >> [mailto:2@mail.vcnet.com]
> >> Sent: Sunday, May 05, 2002 10:59 AM
> >> To: wd7s@att.net; Ian White,
> >> G3SEK; AMPS
> >> Subject: RE: [Amps] Rectifier
> >> diode strings
> >>
> >>
> >>
> >>
> >> >
> >> >
> >> >
> >> >> It is quite common to see
> >> >> mains spikes of 1kV and more
> >> >> on the *primary*
> >> >> side of the transformer.
> >> >> According to ANSI/IEEE
> >> >> statistics, "medium
> >> >> exposure" sites in the USA
> >> >> can expect several hundred
> >> >> 1kV-peak mains
> >> >> spikes per year, and even
> >> >> 5kV-peak spikes at about 1
> >> per year.
> >> >
> >> >Precisely why MOV's or transient
> >> >suppressors should be
> >> mandatory in all
> >> >HV psu's.
> >>
> >> €  For full-wave rectifier,
> >> choke-filter supplies, and
> >> all half-wave
> >> rectifier supplies, yes.
> >> Capacitor-filter supplies and
> >> resonant-choke/C
> >> filter supplies have built-in
> >> spike suppression, so a MOV
> >> is money down
> >> the crapper, except for
> >> testing a transformer with no load.
> >>
> >>
> >> >....
> >>
> >> -  R. L. Measures, a.k.a.
> >> Rich..., 805.386.3734,AG6K,
> >> www.vcnet.com/measures.
> >> end
> >>
> >>
> >
> >_______________________________________________
> >Amps mailing list
> >Amps@contesting.com
> >http://lists.contesting.com/mailman/listinfo/amps
> >
>
> -  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
> www.vcnet.com/measures.
> end
>
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