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NI 9242 and 3 phase no netural measurements

Hi,

     I'm very new to labview and I'm trying to measure the PMG of a generator. The output is a 3 phase wye with no netural. I am trying to measure the line-to-line voltage with a NI 9242 card but the card can only measure in NRSE mode when configured in both NI MAX and Daq assistant. The card does show it can be connected in a 3 phase no netural setup in the getting started guide. Should i take measurments in NRSE mode with the netural disconnected and get the line-to-line voltages mathematically or is there a beter way?

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Hi Drew,

 

 

You're going to need do a Delta measurement:

 

http://www.ni.com/pdf/manuals/376130d.pdf#page=14

 

Thanks,

Jonathan R.
Applications Engineer
National Instruments
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Yes, you need to connect the inputs in a delta configuration, like specified in the documentation and do the math to convert from NRSE to line to line. The math is not to complicated, but in case you are interested there is a toolkit with a lot of common three phase measurements already built-in that you can buy. It's called the Electrical Power Suite:

http://sine.ni.com/nips/cds/view/p/lang/en/nid/210502

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