topic Re: Flicker Measurements in LabVIEW Electrical Power Toolkit

Flicker Measurements

GE-Tony — Thu, 04 Apr 2019 18:14:44 GMT

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?

Thanks...

Re: Flicker Measurements

Yifan.Liu — Tue, 09 Apr 2019 01:32:00 GMT

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

Re: Flicker Measurements

erezg — Thu, 14 Nov 2019 02:17:59 GMT

Hi,

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

thanks, Erez

Re: Flicker Measurements

Yifan.Liu — Fri, 15 Nov 2019 07:41:43 GMT

cRIO based example:

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

Re: Flicker Measurements

erezg — Sat, 18 Nov 2023 18:59:33 GMT

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