Three-Phase Power Analyzer, Etc.

Hi All,
I'm not sure if this is the right board for this question, or if I should ask it on one of the hardware boards. Let me know if I should move it, please.
I need to set up a LabVIEW-based system to monitor the following:
1. Output from three-phase power analyzer (480VAC, 0-100AAC) - this could involved monitoring formatted power-quality data from a power analyzer OR monitoring voltage and current on all phases, then doing the power quality calcs in LabVIEW
2. DC output current (0-200ADC) - This needs to be relatively fast (2000 samples/sec), but not very precise (0.1A resolution would be fine).
3. DC output voltage (0-600VDC) - Again, this needs to be fast but not very precise. See current specs, above.
4. CAN bus - I'll be monitoring a CAN bus and processing CAN data, probably using an NI USB-8473. I have much of the CAN code written already.
Any suggestions on how I should proceed? Has anyone had good results with specific power analyzers tied into an NI-based system? What about current probes? High voltage meters? Is there any pre-written LabVIEW code for three-phase power analysis?
Many thanks in advance.

diarmaede wrote:
Hi All,
I'm not sure if this is the right board for this question, or if I should ask it on one of the hardware boards. Let me know if I should move it, please.
I need to set up a LabVIEW-based system to monitor the following:
1. Output from three-phase power analyzer (480VAC, 0-100AAC) - this could involved monitoring formatted power-quality data from a power analyzer OR monitoring voltage and current on all phases, then doing the power quality calcs in LabVIEW
2. DC output current (0-200ADC) - This needs to be relatively fast (2000 samples/sec), but not very precise (0.1A resolution would be fine).
3. DC output voltage (0-600VDC) - Again, this needs to be fast but not very precise. See current specs, above.
4. CAN bus - I'll be monitoring a CAN bus and processing CAN data, probably using an NI USB-8473. I have much of the CAN code written already.
Any suggestions on how I should proceed? Has anyone had good results with specific power analyzers tied into an NI-based system? What about current probes? High voltage meters? Is there any pre-written LabVIEW code for three-phase power analysis?
Many thanks in advance.
Hmm... I have used a few three phase power analyzers from Voltech, Valhalla, and Yokogawa with LabView.
Right now I would say Yokogawa has my vote. Either the WT230 or (if you got the budget) a WT500. I am currently using both and find the Yokogawa supplied LabView vi's complete and full featured. Since neither of these can measure 100 amps directly you will need to use external current transformers. For best results I recommend buying matching current clamps from Yokogawa when you buy the analyzer Their use is pretty straight forward just enter the scaling factor into the instrument and the readings will be ranged correctly.
DC current and voltage that high will require a current shunt and some scaling for your voltage. Then you could measure it with any decent DAQ device, maybe a cheap as a NI-USB6009. We like to use the Agilent 34970A with a 34901A multiplexer card for this application. The 34970A/34901A is our Engineering Lab workhouse it has the benefit of ISOLATED CHANNELS direct measurement of 300VAC/DC and it can read thermocouples.

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I have a 6510e power analyzer that I would like to read in Labview. I have connected an RS232 cable from the back of it, through an RS232/USB adapter into a USB port in my laptop. I am having a hard time finding a way to read that USB data in Labview to manipulate it to get the power readings. Any help would be appreciated. Thank you.
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I'm trying to measure the phase and the power factor for a three-phase motor. The problemn is that the motor is running with 480V and the SCXI module that I have can only handles until 300Vrms. I'm thinking about using some voltage transformers to step down the voltage and then connect it to the SCXI module. If I do that, will it affect my phase angle and power factor?
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Go to Solution.

Just want to emphasise Lynn's point about 480 nominal volts and what you might actually have.
Get your design and wiring checked by someone certified to do so before connecting.
Some further points:
How is the motor being fed?
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Attachments:
figure 2.jpg ‏70 KB
figure 4.jpg ‏72 KB
3 channel.vi ‏388 KB

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Cory K

Three-Phase Power Analyzer, Etc.

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