Another way to limit the surge is to use Crossing Relays. I use two 40 amp
crossing relays on a 4000 volt/2 amp HV supply, and it works great. These
work by not completing the circuit until the amp draw would be zero during
the 60 cycle phasing..
Thanks and 73's,
Dudley
WA5QPZ
jhurry@austin.rr.com
----- Original Message -----
From: "K7RDX" <k7rdx@earthlink.net>
To: "Ian White, G3SEK" <g3sek@ifwtech.co.uk>; <amps@contesting.com>
Sent: Monday, January 05, 2004 3:12 PM
Subject: Re: [Amps] Step start resistors
> Most ops here in the good ol USA don`t have a problem with house lights
> diming when powering up our amps....We usually run the psu from a
dedicated
> 240vac line....At least that`s my way here in Central WA....Also we have
the
> cheapest hydro power in the world! We sell a lot of our power to the
boys
> in Southern Ca.....Costs them a bit more than us. Incidentally, I step
start
> my 4kv supply with 25 ohms/200watt, and the 6700 supply with
50ohms/200watt
> res. Been doing that for long time now and so far no bitching from either
> supply...Good new year to all, Jim.
> ----- Original Message -----
> From: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
> To: <amps@contesting.com>
> Sent: Monday, January 05, 2004 9:07 AM
> Subject: Re: [Amps] Step start resistors
>
>
> > >>
> > >>Any ideas on what values to use for step start resistors? In the past,
> I've
> > >>tended to choose a value from the available stock - something like 50
> ohms,
> > >>100 watts, which limits the surge current to just over 4 amps. I
expect
> > >>that a value such that the current won't exceed the full load primary
> > >>current of the transformer is probably best, but any suggestions?
> > >>
> > >>(I'll probably still use what's available in my stock of vitreous
> enamelled
> > >>wirewound resistors about 10 inches long and an 1 inch in diameter,
> > >>though!)
> > >>
> > >>73
> > >>
> > >>Peter G3RZP
> >
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