[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [TCML] How do they ballast BIG coils?
Resonant charging would be the best way to go, probably 12 pulse dc power supply to limit harmonics. Charging inductor would be heroic unless a separate charging discharge RSG.
MG set offers adjustable V input and dynamic current limiting, which you better have on a machine of that size.
On Sep 13, 2012, at 6:09 PM, "Steve" <youngster@xxxxxxxxx> wrote:
> The other, arguably better, method is to build a DC resonant charging system
> that doesn't need any ballasting at all. Greg Leyh and others have
> successfully taken that approach for huge coils.
> --Steve Y.
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of David Sharpe
> Sent: Thursday, September 13, 2012 6:51 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] How do they ballast BIG coils?
>
> John
>
> Lets play a thought experiment. Let's build a 5 megawatt machine.
> This is a stretch, challenge, and undeniably the largest machine
> ever attempted. How would one do this?
>
> First I have experience working on Industrial Medium Voltage Power
> Systems and LARGE rotating machinery (motors to 6,000HP, generators
> to 200MW). I would submit the first step is a large synchronous
> MV motor running a large synchronous MV generator. Been around
> for over 100 years and is known as a Ward Leonard Control. Basically
> a MG power amplifier from he$$.
>
> http://en.wikipedia.org/wiki/Ward_Leonard_control
> http://www.wardleonard.com/motor-control-system.php
>
> The motor runs at fixed speed 1200rpm (usually, 6 pole machine) and
> generator likewise runs at 1200 rpm on common shaft line. You control
> output power by field excitation control of the AC output generator.
> High speed field forcing controls are COTS and used on drag line
> strip mining excavators. The below paper is hands down one of the
> best I've ever seen explaining synchronous motor control, and field
> forcing using high speed IGBT DC power packs (PWM force driving
> of fields). This methodology allows local utility power factor and
> voltage support, by field forcing of generator based on instantaneous
> loading, can provide up to 2.5X per unit name plate power (4000 HP
> ==> 10,000 HP short duty). Just a Mythbuster's calculation
> how about 50,000 lb ft of instantaneous torque at 1200rpm supplied
> to generator? ==8^O
>
> http://www.wmea.net/Technical%20Papers/May-2009-Sync-Motor-Excitation-a.pdf
>
> Field forcing allows control of generator impedance, although
> liquid rheostats could also be installed in series to MV load.
> They are also COTS and used for wound rotor motor controls
> up to thousands of HP.
>
> http://www.tmeic.com/Repository/Brochures/TMEIC_SEPT_ICR_low_1256736250.pdf
>
> Actual Tesla system driver could be electronic (though a stretch) or
> spark gap. I would submit that NASA would be the first place to look
> for a new generation SG technology. My son works as a NASA
> employee at Ames Research Center (ARC how appropriate), and their
> ARCJET facility is used for testing heat ablative protection systems.
> The SG heating the gases is rated 60MW continuous with some overload
> capability. This technology could be utilized in developing a totally
> new design rotary or stationary gap system capable of handling MW
> of power.
>
> Its not a question of can it be done, its a question of where is the
> money coming from to do it?
>
>
>
>
> On Wed, Sep 12, 2012 at 10:05 PM, Neon Tesla <neontesla@xxxxxxxxx> wrote:
>> I recently was looking at my home made slide choke and
>> it occurred to me there is no real way that I know of to scale that
>> up like for a coil like
>> 13M<http://www.teslatechnologyresearch.com/model13.html> Magnifier.
>> I love that coil to death, but
>> I have no idea how one would would go about ballasting for
>> 100kVA!
>>
>> --
>> *Don't lower your expectations, raise the voltage !*
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>
>
>
> --
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA USA
>
> Sharpe's Axiom of Murphy's Law
> "Physics trumps opinion!"
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla