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On 12/3/16 7:33 PM, Chris Boden wrote:
I understand that, but....with an NST powered coil, it's rather moot isn't
it?
You're drawing more current through your variac, which will get hotter.
And while a single 30mA 15 kV NST is only going to be 400-500 VA, if you
start ganging them up in parallel, or getting a 60mA 15 kV unit, then
you're getting up towards where the current draw is an issue
I mean, you're drawing only a few hundred watts. The "wasted power" isn't
enough to trip the breaker, and the impact in your electric bill is on par
with your doorbell.
The bill will be the same whether you have PFC or not - your meter only
measures active power, not reactive power. So if you were drawing, say,
15 A @ 120V (1800VA) and the PF were 50%, your meter is only going to
spin for a 900W load.
(there's a very small effect from the IR losses in the wiring because of
the reactive power, but it's "small".. IR loss is <2% with 100% PF, and
only slightly more (<4%) with 50% PF
Maybe I'm missing something, my electric bills are a little different than
most. It just seems like a lot of effort for very little tangible gains.
We certainly don't worry about it here in the lab.
I sort of agree - there's not a lot to be gained by worrying about PF.
On Sat, Dec 3, 2016 at 7:58 PM, jimlux <jimlux@xxxxxxxxxxxxx> wrote:
On 12/3/16 4:03 PM, Chris Boden wrote:
The question I have is......Why? Why would you want to lower the PF?
Total line current is less - the meter spins slowly for the current, but
the breaker will trip.
if you have 71% PF, you'll draw 14 amps from the socket, but only be
really using 10 of it to make sparks.
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