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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
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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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