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Measure AC Voltage of each phase of 3 phase circuit

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harthenry

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I am resurrecting the post at: https://www.edaboard.com/threads/340256/

In this post, it shows using the isolation transformer PT202d in conjunction with an OP-AMP, however, the post never finished out and provided a full schematic for this design.

I am looking to read each phase of a 3 phase (3 wire or 3 wire+grnd) up to 600 VAC (most of the time it will be 480). As you know, each leg of the 480 line will be near 277 VAC, whereby the 600 VAC lines will be 347.

The output of the isolated xFormers will be going to an analog input (either 0 to 3.3 or 5 VDC)

I would appreciate if someone could help me in finishing up the electrical design as shown in the thread I mentioned earlier.

Thanks,
HH
 

Hi, if you are interested in isolating the line voltage using transformer, get a small current rated transformer core and rewind it. You can wind base on phase to phase voltage or phase to neutral voltage.
 

ahmed-agt: Isolation is one of the goals, as shown in the HTTP link from the original thread. That is why I am reaching out to folks here on the BBS if they can finish that schematic for me.
Thanks, HH
 

Before the opamp or processing circuit try and create the transformer, since the line frequency is either 50 or 60hz. A transform core of 6,9, 12v at 300- 500ma can be use. Rewind it using transformer ratio formulas to require voltages.
Meanwhile, there many method of processing the output of your transformer from references.
 

ahmed-agt: Are you referencing/looking at the referenced HTTP in the first post of this thread? There is already an isolation transformer present. when you state, there are many methods of processing the output -- I am only looking for 1.
Thanks, HH
 

harthenry said:
There is already an isolation transformer present. when you state, there are many methods of processing the output -- I am only looking for 1.
Click to expand...

What is wrong with rectification and filtering the output from the potential transformer? I do not think it is a really challenging problem!
 

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