What's protecting the primary winding
insulation??
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
>
>
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