Data Acquisition Solution for Measurement of Temp,V,I,P,Q,PF,f

[nnarra]

Dear All,
I am facing one problem in selecting the Hardware,can anybody support me,

This is regarding DAQ Solution(cFP) for Measurement of Temperature,Voltage,Current,Active Power,Reactive Power,Power Factor and Frequency for a Motor.
Requirement is that, Measurement and Monitoring of Temperature,Voltage,Current,Active Power,Reactive Power,Power Factor and Frequency for a Motor
1)12 RTD Inputs(PT 100 Sensors)
2)3 Current(From 3 CT's) ,3 Voltage(From 3 PT's) [From these 6 Parameters,Active Power,Reactive Power,Power Factor,Frequency we have to derive ]
 Hardware which i have selected is attached,please find the attachment..

RTD Module which i have selelcted is ok,but i have one doubt in AI Module Selection,
I selected AI 100 Module(8 Channel(Both V,I).12 bit,360 S/s[in this i have one doubt,i.e.360 Samples that to per channel or 360 Samples per 8 channels?) for taking 3 Voltage Signals from PT's and 3 Current Signals from CT's)

If we install and take signals from Motor,in reality harmonics(Max if we consider 8th Harmonic Components [8*50=400 Hz will be signal Freq]) will come into picture,
For finding frequency(From V,I wave shapes),atleast (5 Fs i.e.5*400=2kS/s i have to take right,correct me sir if i am wrong..)

Why we want this system is,currently,we are using Yokogava Power Analyzer for finding Voltage,Current,Active Power,Reactive Power,Power Factor and Frequency,But RTD it cant..,So we need total System with RTD SIgnals and above parameters to be monitored in a host PC without any Power Analyzer,i.e.our measurement system should be independent of Yokogava Power Analyzer.Again one problem is that Yokogava is giving Accuracy 0.02% in the measurement of Power and what about the accuracy of our system and for this,which Module shall i go for?)
 
Regards,
Bujjin

[sudeepn]

Hello Bujjin,

                   AI 100 Module does not have simultaneous sampling features so it means the sampling per channnel is 360/8 S/s/channel.

As you have rightly interpreted with this module you can measure signals upto 20 Hz (max). So, I suggest you opt for a CRIO in place of a CFP. CRIO modules have higher sampling rates of the order of kilo samples / channel . If you want to switch to the crio platform go to ni.com/crio.

[Wayne.C]

Bujjin,

sudeepn is correct.  cFP-AI-100 sample rate is much too slow.  I have sucessfully sampled a 60Hz waveform with a cFP-AI-118 used with a backplane and a cFP-2220.  Ended up with a sample rate of about 4K/S.  A cRIO would provide much higher sample rates.

Any chance you could just monitor the existing power meter via RS232 from PC and just add some RTD hardware?

[nnarra]

Hi sudeepn,

thanks for your reply..

As recommended by you,i will select the adequate cRIO Hardware Configuration as per my requirement,

Thanks and regards,

Bujjin

[nnarra]

Hi wayne.C,

Thank you very much for your reply,

Actually Interfacing the instrument for Power and remaining using Compact DAQ is also one more solution as u told,

but problem here is that,we are always dependent on the instruemnt.So i am looking for common Hardware platform

which will server both the purposes,and obviously,i will go for cRIO Solution,as sampling rate will be higher,

Thanks and regards,

Bujjin