How to identify/measure the voltage values in the 3 phase lines using a Arduino Uno microcontroller

How to identify/measure the voltage values in the 3 phase lines using a Arduino Uno microcontroller

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Thread Starter

Paras Jatkar

Joined May 29, 2015
2
Hi,

I have the following requirement:
Identify/measure the voltage values in the 3 phase lines using a Arduino Uno microcontroller.
I know that I cannot feed 230v to the microcontroller. The input voltage to it is 0 to 5v.

Can anyone suggest is there a existing module that takes in 250V and gives out 0 to 5v proportional analog voltage?
So that I can feed that analog voltage to the microcontroller and calculate back actual voltage using a formula?
I have also placed my question in the diagram in the attachment.

Thanks in advance!!
 

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mitko89

Joined Sep 20, 2012
127
Homework section?
Generally, when you have a high voltage, the possible aproaches are: use voltage deviders, use a transformer, use a contactless sensor (measure the magnetic field).
What is the purpose of the measurement? Do you want to check the phase sequence?
 

Thread Starter

Paras Jatkar

Joined May 29, 2015
2
First of all thank you for the instant reply :)
Actually what i want to do is: measure the voltages in the 3 phases, and if all of the voltages are above 200V i want to trigger a relay to turn on the water pump. This water pump runs on 3 phase.
 

ErnieM

Joined Apr 24, 2011
8,178
I would recomment you use step down transformers to give you a safer voltage to sample.

You don't get a nice 0-5VDC output to sample, though you could make a full wave bridge rectfier along with a cap (basically a simple power supply) and a resistive divider to keep things below 5V.

Having such transformers means your controller need not be connected directly to the AC line.
 
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