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Re: PFC
- To: tesla@xxxxxxxxxx
- Subject: Re: PFC
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Mon, 04 Apr 2005 13:05:22 -0600
- Delivered-to: testla@pupman.com
- Delivered-to: tesla@pupman.com
- Old-return-path: <teslalist@twfpowerelectronics.com>
- Resent-date: Mon, 4 Apr 2005 13:09:18 -0600 (MDT)
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- Resent-message-id: <3s_lGD.A.23.cDZUCB@poodle>
- Resent-sender: tesla-request@xxxxxxxxxx
Original poster: Ed Phillips <evp@xxxxxxxxxxx>
"I have 2 9kv-60ma NST's that I bought from someone on the list a couple
of
years ago. They are Franceformer part # 9060PC, and they are marked
300VA
and also High Power Factor.Can anyone tell me if these are power factor
corrected or do I need to add PFC caps?
Thanks,
Jerry"
They are corrected for minimum line current in normal usage. However,
I still can't understand some of the rules of thumb for "power factor
correction" of TC power transformers, considering that the load is
already capacitive and disruptive in nature. I can see the possible
benefit of a large capacitor across the line in reducing high-current
glitches, but the rest is a mystery. (In NST's there's often a tertiary
winding with the PFC capacitor connected to it, apparently to reduce
capacitor size.) The subject's been discussed here many times in the
past.
Ed