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3 Phase voltage measuring circuit with out Neutral

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rparthiban69

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Hi
I need to 3 phase ac supply voltage by using voltage divider circuit. voltage divider output is given to microcontroller adc pin. Any one update voltage divider circuit for rectify this mistake. circuit.png
 

KlausST

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Hi,

either you connect your signal GND to one of the phases and measure the other two phases referenced to it,

or you use three voltage divider (2 x two resistors) and refer all three to your signal gnd.

With no other currents (isolation or capacitive coupling) you can measure all the phases independently.
In reality you will have to do some maths to get the correct voltages.

Klaus
 

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