Phase angle between voltage and current(HELP!)

[lamela]

Hey guys! I'm stuck with my assignment(project) and I need some help here! So I'm required to find the phase angle between voltage and current as a measurement and I've googled a lot but I'm still very lost. I'm using DAQ assistant as the input signal and currently I'm doing a test circuit. Really appreciate if you guys can help me, like a sample of a basic calculation would help too! Thank you!

[Fragrz]

Hi,

Here's sample VI that generates two phase shifted waveforms and then calculates phase angle using corelation method.

[lamela]

Thanks for your reply!

It says LabVIEW load error code 9: VI version (14.0) is newer than LabVIEW version (11.0). Do you have the version 11.0? Thank you!

[Fragrz]

Sure!

Here's 2011 version.

[Henrik_Volkers]

if you capture more than 10 periodes try the tone detection vi. One output is phase 🙂   do it on U and I and calc the difference.

The tricky part will start if you have a sine like input voltage but a funny looking current due to a nonlinear or switching current sink.

Again the tone detection can help since you can narrow the frequency range of interest.

True power factor calculation is another thing ....

If you have a test setup compare the distrubution of the tone detection versus the correlation ....  and post results 🙂