Is this a student problem or a work problem? What is the voltage involved? What is the current involved? Is something you will only do once, or is it a repeating problem?Hi everyone.
I have to measure the Power (W). For that purpose I have AC voltage with zero crossing signal and AC Current. Both AC voltage and AC current waveform are full wave rectified.
To calculate the power we must know the power factor.
My question is can we calculate the power factor by using these 3 signals or I need zero crossing signal of AC current too to find out the time difference between them?
What I searched on the internet is that we need two zero crossing signal to calculate the time difference.
I want to know is there anyother way to do it?
I am using PIC18f452 microcontoller for power calculations.
Thanks
Man, those are some ugly waveforms. Definitely not sinusoids. Power factor assumes sinusoids. At the very least you'll have to calculate the rms values of those waveforms to get meaningful power information.Thanks all for your reply.
Yes its a Grid Power (220vac 50Hz). scale down the signal using resistors and amplifier and giving it to microcontroller. For current measurement I use CT.
Zero crossing signal is generated from voltage signal.
Its a 1 phase system.
Its a work problem not a student problem.
Kindly tell me if any other information you need. I will try my best to give to.
View attachment 184441
How many amps is the current?Thanks all for your reply.
Yes its a Grid Power (220vac 50Hz). scale down the signal using resistors and amplifier and giving it to microcontroller. For current measurement I use CT.
Zero crossing signal is generated from voltage signal.
Its a 1 phase system.
Its a work problem not a student problem.
Kindly tell me if any other information you need. I will try my best to give to.
View attachment 184441
If it's for work than why not buy a measurement device made for that purpose.Its a work problem not a student problem.
In physics there is RMS voltage and RMS current. But there is nothing like RMS power.for measuring the true RMS power.
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