Re: Three phase rectifiers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

another way to approach it is to consider the stored energy in the
inductor.. (1/2 L I^2)

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, February 03, 2001 7:56 PM
Subject: Re: Three phase rectifiers


> Original poster: "Greg Leyh by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<lod-at-pacbell-dot-net>
>
> Original poster: "Finn Hammer by way of Terry Fritz
> <twftesla-at-uswest-dot-net>"
>
> > 3-phase is cool, but also obligating, since noone should ever draw more
> > than, say, 35 amps from one phase only, since this will skew the grid.
> >
> > I think the 3-phase rectified supply would be more used, if the function
> > of the charging choke was better understood.
> >
> > Would you please explain how to determine a proper sized charging choke
> > in a system, where transformer voltage and capacitor size is already
> > given, so that it results in the desired doubling of the voltage across
> > the cap/vs the input voltage, while keeping the current from the
> > transformer to the gap during ringdown low enough  to allow quenching of
> > the gap without making a rapid recharge of the cap impossible.
>
>
> Basically, you start with determining the max break rate desired.  An
> example:
>
> Max desired break rate = 400 BPS
> Cpri = 0.3uF
>
> The resonant charger frequency should be 200Hz, since the capacitor
> will charge in 1/2 cycle of the resonant charger frequency.  You would
> then select a value for the charging reactor that will resonate with
> the Cpri at 200Hz.
>
> Lchg = 2.11H
>
> Note that this value is completely independent of Vpri, line frequency,
> or any variables other than the maxBPS and Cpri.  The charging action
> of the reactor has no effect on gap quenching, since the reactor current
> is zero when the gap fires, and is held at zero by its massive inertia.
> --
>
>
> -GL
> www.lod-dot-org
>
>
>
>