Can you space the loops of your choke coil a bit apart and slip on a zillion small ferrite rings? Also there is a 600v 35 amp 3 ph choke on ebay for $99. PS before you electrical engineers stomp all over me I am just a chemist with wild ideas Jim Heagy -----Original Message-----
From: Brandon Bebault via Tesla <tesla@xxxxxxxxxx>
To: Sparktron01 <Sparktron01@xxxxxxxxx>
Cc: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Mon, Jan 6, 2020 3:16 pm
Subject: Re: [TCML] Filter coils for large generator.
David! Thank you. The current rig is single phase. But I do plan on making a large drsstc in the future that will be three phase. Also the idea of a large emi filter from server sized UPS is a brilliant idea.
-Brandon
Sent from my iPhone
> On Jan 5, 2020, at 3:08 AM, David Sharpe <sparktron01@xxxxxxxxx> wrote:
>
>
> Three phase, single phase? A common mode choke and some good filtering caps might be more effective then installing in line (normal mode) chokes. NM chokes would help with PF correction. CM chokes tend to be a large ferrite ring with 10-30 turns of both hot legs single phase or two phases three phase. The coils are arranged so that with current flow through them, magnetic fields cancel each other (subtractive polarity). With three phase you need (3) of them (A-B, B-C, A-C). Rings have to be big because your winding large wire on them (10 turns of #6 x 2 sets on a 2” ID ring will be damn near impossible to fabricate by hand). A power (LF) ferrite or powered iron toroidal rings will be needed and these sizes won’t be cheap unless you can repurpose out of a wrecked EMI RFI filter.
>
> The best option would be a purpose built 100/200 EMI filter, rated for voltage of your generator. They’re often in 20-30kVA 120/208 3ph Data Center UPS’s. Salvage prices vary $100ish is possible. New upwards of $500-$1000 or more.
>
>> On Sat, Jan 4, 2020 at 11:47 PM Brandon Bebault via Tesla <tesla@xxxxxxxxxx> wrote:
>> Hi All,
>>
>> I want to make some large band pass filters to protect our generator. I recently acquired a 40kw tow generator to power our 15kw rotary spark gap Tesla coil. I want to take some extra measures to protect the generator. I’m thinking of some large ferrite core toroidal chokes or air core chokes with maybe 10-20windings to limit the high freq. One individual choke per leg of the power transformer I think that may be all I need but I’m guessing and would rather not guess.
>>
>> Any input appreciated.
>>
>> -Brandon Bebault
>>
>> Sent from my iPhone
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> --
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA USA
>
> Sharpe's Axiom of Murphy's Law
> "Physics trumps opinion!"
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