LabVIEW Electrical Power Toolkit

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Flicker Measurements

I am trying to calculate short and long term flicker using my VI, image attached.

The values, Pst and Plt, are always zero and I don't know why.

I am reading the data that the scope acquired from a file.  It consists of time and amplitude.

Does anyone see anything, or many things, that I am doing wrong?


Flicker VI.jpg



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The Power Quality measurement VIs do not accept raw data input. You should resample the raw data first.


Please refer to the examples at:

C:\Program Files (x86)\National Instruments\LabVIEW 2017\examples\Electrical Power\Power Quality\Applications (DAQmx)\Flicker Measurement (DAQmx).vi

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Is there an example of flicker calculation that does not require DAQmax?. 

thanks, Erez

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cRIO based example:

X:\Program Files (x86)\National Instruments\LabVIEW 201X\examples\Electrical Power\Power Quality\Applications (cRIO) (Delta-Sigma)

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Getting back to the flicker measurement... 

I'm trying to calculate the flicker, based on data I measured on a scope.

I can see that to get a valid value, I have to measure at least 10 min and break it to 200msec blocks . Is there a way to use a shorter data (for example, maybe zero padding or pure sinewave padding)?

Also, one of the inputs is the voltage range. There are only 2 options (230 and 120). My system is 400Volt. How should I converter the output?

thanks, Erez


Attached, a picture of the code (I replace the scope data by simulation)

thanks, Erez





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