Posted by John T on December 16, 2013 at 15:27:35 from (216.249.76.176):
In Reply to: Re: JohnT? posted by George Marsh on December 16, 2013 at 14:42:16:
"So, if I got things right in my head, with or without caps, the motor uses the same current and generates the same heat."
I cant say that's exactly right, but its hard to explain and I'm way too lazy to dust off my books lol. Here's what I will say, however. If the PF is unity meaning, the current isn't leading or lagging the voltage, its in phase, the vector sum of the resistive current component and reactive (L/C) current component is the same as the resistive ONLY i.e. C canceled out the L. However, if the PF is less then unity, the current is the vector sum of the 2 out of phase components (R + L/C) even though a meter doesn't take that into account, its watts NOT Volt Amps.
"What about a generator? Is it better for a genny to PF?"
The utility or a genset generates a sine wave and it has to "work" less if the load is unity PF. If the PF is lousy the genset or utility is actually having to produce the in plus out of phase current components (vector sum) and that's why we were charged a penalty for a lousy PF even though our watt hour meters registered the same
HEY GEORGE IM RUNNIN OUTA SMARTS ON THIS PF STUFF this is my best recollection but certainly not warranted correct. When I believe an answer is correct I just state it, but Im NOT sure on this PF stuff, its been too long, dont take any drastic steps based on the above, consult someone more current in the trade whose not been retired over 20 years ........
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