Hi, I have a project to make a 3 Phase AC voltage and current measurement (<200 V). If it possible and safe, what sensors/ measurement method that can be used before i put it in arduino and display it on an LCD
Current can be measured with current probes.
Voltage is more dangerous. Consider a transformer to bring it to low voltage. Actually, you will need 3 transformers...
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have a look at measure-ac-current-using-arduino-and-sct-013
using SCT-013 clamps with the ESP32 I use a ESP32-4-Channel-Mains-Current-Sensor
e.g. measuring house current
to measure voltage you can use transformers to reduce the 200V to a level suitable for the ADC - again you have to offset the AC result to suit the DC input level of the ADC
both current and voltage when read by the ADC give the value at that instant in the AC cycle - you have to sample over several cycles to get the RMS value
NOTE: working with 200V mains is dangerous - make sure you have isolation switches
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