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*To*: tesla-at-pupman-dot-com*Subject*: Re: Three phase rectifiers*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Sat, 03 Feb 2001 20:56:45 -0700*Resent-Date*: Sat, 3 Feb 2001 21:12:23 -0700*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <E9cBO.A.uAC.kaNf6-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

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

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