Re: [TCML] Power factor correction

[David Speck <Dave@xxxxxxxxxxxxxxxx>]

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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