need help to mesure voltaje from 3 phase delta type

Hi all,
I need to measure the voltage of a 3 phases delta-type that feed an motor,

each phase give 440 volts, i acquired some zmpt101b but until now that I'm seeing it I realize that it only supports 220 volts using a line and a neutral, there is some way to measure the 440 of each phase, or any sensor they recommend for that

It is a school work and 90% of the qualification of my thesis, I need help thanks

I guess the short answer is carefully - these are killer voltages and not for the unqualified to play with. You post suggests you are not suitably qualified and trained .

In principal you could use an instrument transformer to drop the voltage to a more “ usable” voltage . Specialist item for 440v however .

Google instrument transformer.

im not the one to install the system i just build the circuit , after a long time searching i found this one thanks to another member of the forum
https://www.hicomponent.com/3-phase-ac-voltage-transducer.html

i hope this transducer can do the job

Have a licensedelectrician install a 3 phase transformer and then install three 230 v outlets.
Then you can plug in wall wart transformers that drop the voltage to 12 volts AC
AC is the key
You do not want to use a phone charger
Once you get the low voltage then you can bring that into the arduino

WarLion:
Hi all,
I need to measure the voltage of a 3 phases delta-type that feed an motor,

each phase give 440 volts, i acquired some zmpt101b but until now that I'm seeing it I realize that it only supports 220 volts using a line and a neutral, there is some way to measure the 440 of each phase, or any sensor they recommend for that

It is a school work and 90% of the qualification of my thesis, I need help thanks

WarLion:
Hi all,
I need to measure the voltage of a 3 phases delta-type that feed an motor,

each phase give 440 volts, i acquired some zmpt101b but until now that I'm seeing it I realize that it only supports 220 volts using a line and a neutral, there is some way to measure the 440 of each phase, or any sensor they recommend for that

It is a school work and 90% of the qualification of my thesis, I need help thanks

Your 440 volts is between phases. What is the voltage between any of the phases and neutral?

Remember, the 440 volts is a nominal voltage under load. Unloaded it may be much more. And then there are harmonics to contend with.

Paul

Paul

the 3 lines have L1 220 L2 220 L3 220 theres not neutral here to measure i need to check
L1 + L2 = 440
L2 + L3 = 440
L3 + L1 = 440

this motor consume about 400 amps

but the zmpt101b module

only support 220 and is needen the neutral

WarLion:
i acquired some zmpt101b but until now that I'm seeing it I realize that it only supports 220 volts using a line and a neutral...

No. This is a 2mA current/curent transformer, so line voltage is not relevant as long as you stay within the curent limits of the transformer. I see on modules on Google a 820k smd current limiting resistor.
High enough value to keep current under the transformer's 2mA limit, but I wouldn't trust 400volt AC across that resistor. Not even 220volt. Maybe you should use external high-voltage resistors for current limiting.
You should ask Uni staff to help you with this. 400volt AC is dangerous. Flash-over across the smd resistor and/or other parts is likely.
Leo..

3 wall wart transformers with primary of each connected in star across 440, measure off low voltage of wall wart and multiply accordingly.

WarLion:
It is a school work and 90% of the qualification of my thesis, I need help thanks

I am just guessing here, but if the grade is based 90% on this, The professor would expect you to have been taught and to know how to do this.

bluejets:
3 wall wart transformers with primary of each connected in star across 440, measure off low voltage of wall wart and multiply accordingly.

got any links to wall wart that are rated for 440volts ?
the OP said it was wired Delta
I believe that the Forum genearlly goes by the assumpton that if you are asking, you are not trained
and if you are not trained, you are not qualified to work with high voltage.
Here in the US, everything inside of the electrical panel that has 440votls, must be rated for 440 volts.
that means if you have CT, the leads from that have to be rated for 440 volts and not cheap headphone wires.
The only way to do this is to install a transformer with a 440 primary so that the secondary is lower voltage.
since this is 3-phase, that offers some challenges.
if this is 90% of his grade..... I am thinking he should know more about this.

WarLion:
3-Phase AC Voltage Transducer with Delta Wiring Terminals

this says that it is isolated from primary to secondary and the power supply is also isolated.
the output can be ordered for 5 VDC
and it is available in Wye or Delta.
this looks like the perfect solution for you.