if((deltaT1 >= 6.662) && (deltaT1 <= 6.669))
Yes I can make the 3x CT interface from 0-4.5v@mcmsat13
We can measure the three phase currents using CTs. The CTs output will be converted to V for input to ADC. If phase is open then no current will flow and hence that ADC will give 0V. From this we can detect phase failure and it is the easiest method. If you can make the 3 CT interface to PICs ADC then I can make a code for you. You have to make the CT interfacing circuit so that the ADC inputs will be in the range of 0 to 5V for your phase current range.
See the attached image. I thought about doing like this. Detect the deltaT between each ZC and if deltaT1 and deltaT2 are approximately near to 6.667ms (which is the time between each phase) then it means that phase exist. So, there will be no angle measurement or any complex calculation. Just the time value obtained is compared with a range of values like
Code:if((deltaT1 >= 6.662) && (deltaT1 <= 6.669))
if deltaT1 and deltaT2 lies within the range then it means that all the phases exist.
I still need experts advice. A 3X ZCD circuit will be cheaper compared to 3X CT circuit.
We can measure the three phase currents using CTs. The CTs output will be converted to V for input to ADC. If phase is open then no current will flow and hence that ADC will give 0V. From this we can detect phase failure and it is the easiest method. If you can make the 3 CT interface to PICs ADC then I can make a code for you. You have to make the CT interfacing circuit so that the ADC inputs will be in the range of 0 to 5V for your phase current range.
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