measuring 3 phase voltage directly with a pic adc

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joshinjoy

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Please Some body help

For my new project i need to measure the 3 phase voltage. and implement high voltage cut off and low voltage cut off
ie; high voltage cutoff at 440v and low voltage at 380v
i need it to do with a pic16f877 controller. i don't not know any thing about 3 phase
what i need is a circuit.

thanks in advance
 

Investigate if the 3-phase system has Neutral ..
If yes, the voltage of each phase referenced to N is roughly 230Vac and you can use off-the-shelf mini-transformers to reduce that voltage to, say 9Vac ..
From here follow the attached circuit ..

:wink:
IanP
 

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  • AC-to-PIC---inputcircuit1.png
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Dear Sir I am also facing same problems but i converted 230 volts into 5 volts using step down transformer on each phace but when i conected one phase voltage to pic circuit bord that phase voltage shows correct ADC results but other than this conneted pic chip phase its shows a abnormal voltages like 0, 5 volts fluctions i using ADCON1 registors for refrence voltages by selecting multiplexer its not working properly, but i still struggling plese guide me how to maintain contant voltage on each phase and
 

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