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In Reply to: RE: What? posted by pictureguy on August 15, 2014 at 16:33:21:
Power factor can range from negative 1 to positive 1. It is the ratio of real and apparent power. A purely resistive load would have a power factor of 1. A power factor of -1 would be something that is normally a load but is instead generating power power back into the source.
It is hard to communicate some concepts. Some things are vectors which can be added/multiplied but they are done differently. Other things are only true in certain conditions. When it is "displacment power factor only" the power factor is the cosine of the angle between the current and voltage sinusoid waveforms. When it is distortion all bets are off:)
It is even more confused by certain conventions such as calling leading/lagging power factor as +/-power factor. But rest assured, despite leading publications to the contray, there is such a thing as negative power and negative power factor.
You might find this link interesting....best I could do on a quick search.
http://www.cui.com/catalog/resource/power-factor.pdf
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Follow Ups
- RE: What? - Russ57 19:18:03 08/15/14 (1)
- RE: What? - pictureguy 00:39:47 08/16/14 (0)