Hi, i want to know if there is a way to know whether it is a Capacitve or an Inductive Load with the Open monitor code, or some other way??
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Capacitive or inductive LoadSubmitted by abh015 on Wed, 02/03/2016 - 05:59Hi, i want to know if there is a way to know whether it is a Capacitve or an Inductive Load with the Open monitor code, or some other way??
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Re: Capacitive or inductive Load
@abh015,
Inductive. Seriously, in a domestic setting, I've only ever seen a couple of leading power factor loads - one was an old style ballast flourescent fitting that had been 'liberated' from a factory site (wired as leading pf to partially compensate for the many other lagging loads on the same riser) The other was a bodged split phase motor repair using a wildly incorrect C value.
Re: Capacitive or inductive Load
There's no means whereby the emonTx with the standard sketch can detect that. You would need to delay the voltage wave by 90° and then derive the vars - in much the same way as the real power calculation is done now.
Re: Capacitive or inductive Load
I did not understand very well what you say. I'm doing a project with this and i need to find out beside the PF if it is leading or lagging. How is it that you say?, or is there a way to detect zero-crossings with the arduino and the signal received?
Re: Capacitive or inductive Load
Look at the 3-phase sketch. That delays the voltage by ⅓ & ⅔ cycle to give the real power for the 2nd & 3rd phases. Change that to ¼ cycle and the resulting 'power' is vars, and it will have a sign that indicates leading or lagging. Then knowing the product of current and voltage on both the real and imaginary axes, you have everything you need to determine which quadrant the current phasor is in.