topic Re: Reactive Power Sign in LabVIEW Electrical Power Toolkit

Reactive Power Sign

PSav — Thu, 14 Feb 2019 14:56:23 GMT

Hi all,

A quick question regarding the Power block from the electrical power toolkit. This block receives the voltage and current measurements to calculate Active, Reactive, Apparent power and Power Factor. This is correct in terms of absolute magnitudes for all except Q i.e. way Reactive Power is calculated will always result in a positive Q. From this it is difficult to further derive the angle between voltage and current (phase difference). Is there any suggestions on what could be an easy way to modify to achieve this?

Many thanks,

Petros

Re: Reactive Power Sign

Yifan.Liu — Fri, 15 Feb 2019 01:56:32 GMT

Use the Fundamental Vector VI to first calculate the vectors of the voltage and current, and then use the vectors to calculate the phase differencen between voltage and current.

Please refer to the example: Advanced Power Measurement (DAQmx).vi.

Re: Reactive Power Sign

PSav — Thu, 21 Feb 2019 09:37:48 GMT

Hi Yifan!

Many thanks for your response, it seems I'm now getting somewhere with what you suggested!

Thank you,

Petros