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Re: [TCML] Power factor correction



John Cooper,

Are you the one looking for some #14 or # 12 magnet wire?

Dave

> Date: Thu, 3 Sep 2015 13:20:38 -0500
> From: wt5y@xxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Power factor correction
> 
> 
>     
> So I put dmm in amp mode, switch probe leads to 10 amps plug, current Xformers over the cord or just the hot wire?  And if it is running 25 amps I would see 2.5 amps on my meter?
> 
> 
> Sent from my Samsung GALAXY S5™, a Cricket 4G LTE smartphone
> 
> -------- Original message --------
> From: David Speck <Dave@xxxxxxxxxxxxxxxx> 
> Date: 09/02/2015  23:13  (GMT-06:00) 
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> 
> Subject: Re: [TCML] Power factor correction 
> 
> John,
> 
> Check out eBay for a current transformer.  A 50:5 unit will multiply 
> your DMM readings by factor of 10.  They should be available for under 
> $20 with some diligent looking.
> 
> Something like the following would work.  (no connection to seller.)
> 
> http://www.ebay.com/itm/130895906892
> 
> Just be careful to never put current through the transformer (CT) 
> without having a load, like your DMM on its amperes setting, across the 
> CT terminals.  When unloaded, a CT tries to put out infinite voltage 
> which may break down its internal windings.
> 
> Then, you can investigate which arrangement of PFC caps works best for you.
> 
> Dave
> -----------------------------
> 
> I'm at the point I need to add some motor run caps, I'm thinking the 
> same that go on your ac units in the 40-50uf 330-440v variety unless 
> someone has a better suggestion.  Looks like I will need around 150uf 
> per transformer I have 3 12/60 NST.  Biggest question is do I run all 9 
> parallel or run about 3 strings of 3 to each?  Would before or after the 
> EMI filters make a difference. Blowing 20 amp fuses on variac, don't 
> have a clamp meter and my dmm is only good to 10 amps inline.  I was 
> going to add some and then start measuring the current? John Cooper
> 
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