On 3/7/2013 6:26 PM, KA4INM wrote:
So you are saying our tube HPA's hV power supplies have a near unity
power factor?
Thinking about your question and my reply, it occurred to me that you
might not be aware of how Power Factor has been redefined to include
both Phase Angle (the original definition) AND harmonic current.
The original phase angle contribution is now called the "Displacement
Power Factor" and is the cosine of the angle between fundamental (50/60
Hz) current and voltage, the Harmonic contribution is called the"
Distortion Power Factor," and the the ratio of the fundamental power to
the total RMS power, and the "Total Power Factor" is the Displacement
Power Factor multiplied by the Distortion Power Factor.
In the "olden days," when loads were mostly light bulbs (resistive),
heaters (resistors), and motors, load current tended to be a bit
inductive, so power factor correction meant adding parallel capacitance.
Now, loads are heating (resistors, but pulsed to make them variable),
electronic power supplies, inductive motors, and motors with variable
speed controllers (which draw mains current as switching power
supplies). Now, power factor correction is more likely to involve the
reduction of harmonic current.
As I understand conditions in the EU (thanks to my activity in
international standards work), equipment made and sold there tends to be
compliant with EU regulations. EU EMC regulations do place limits on
Power Factor, RF Emissions, and mains Leakage Current, and they require
that Susceptibility to RFI be stated on the product label or data
sheet. So -- since SPE amps are made in Italy, an EU country, there's a
good chance that they are compliant with EU regulations. Or maybe not. :)
73, Jim K9YC
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