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mandulaj / PZEM-004T-v30

Arduino library for the Updated PZEM-004T v3.0 Power and Energy meter
MIT License
256 stars 108 forks source link

CTs of higher rating #127

Open shayankhawar opened 1 week ago

shayankhawar commented 1 week ago

Can a current transformer (CT) with different ratings be used by applying a multiplying factor or modifying the board shunt, such as R18? Can we use another CT apart from the one provided, such as a 100A input and a 100mA output, by using a high-power shunt across the CT terminals to approximate the actual value with a multiplying factor or another method?

For instance, can we use it as a 10A variant by connecting the CT in series instead of a load? Typically, standard industrial CTs have a 5A output. The issue with the 10A variant is that it takes a 220V measurement from the same line as the shunt, so I want to modify the 100A v3 variant a bit. If anyone can help, please let me know.

mandulaj commented 1 week ago

In theory yes, I would calibrate the PZEM using a known good multimeter as the scaling factor could be something unexpected.

shayankhawar commented 1 week ago

ok, I get it, but clipping to some value due to its limitation of measuring up to 100A, eventually, we are somewhat bound. Can someone provide detailed insight and changes for such implementation?