I need to measure a current of 100A using ADE9135A. for this, I have used a Current Transformer of 100/5A current transformer and connect it directly to the shunt resistor can it and a scaling factor is used to scale up the value.
is it possible to connect ct coil to a shunt resistor? can it measure the current in the load please refer to the image.
Hi,
First off, if the maximum current you are measuring is 100A RMS then you could still use a shunt only, you would just want to use something like a 100uOhm-300uOhm shunt and a gain of 16x for the PGA. Just make sure you double check what the maximum current would be so that you don't go above the absolute maximum rating of the inputs. The only issue with this solution would be the heat generated on the shunt, if you have 100A flowing through then make sure the design can handle that.
If you do want to use a primary CT then the way you have it setup would be exactly how it needs to be done. The CT output needs a burden or shunt resistor in order to translate the current into a voltage for the inputs of the ADE9153A. Just be sure to choose the resistance correctly for the inputs.
In terms of the self-calibration feature, mSure self-calibration will only be able to calibrate the shunt to be able to accurately measure the current through the shunt. You will need to apply your own scaling factor to translate the current through the shunt into current through the CT. I imagine the CT will have some variation so the question to ask yourself is; are you OK with the percent variation CT to CT or do you want to calibrate the CT as well.
where can I find 100A AC shunt resistor or I have to make it on my own.
There are a variety of companies that make shunts that can handle 100A, a couple examples would be Isabellenhutte or Vishay. You can also find a variety of shunts on sites like digikey, just go to current sense resistors.
I would recommend picking a shunt size 300µΩ or smaller for the purposes of signal size and heat dissipation. Also, make sure that the shunt can take the amount of power you expect to be going across it. In addition to what I just mentioned, there are a variety of manufacturers out there who can make custom shunts to mechanically fit your design.
can I use this for 100A current sensing
please refer the link below:
https://www.mouser.in/ProductDetail/Ohmite/SHD1-100C075DE?qs=sGAEpiMZZMtlleCFQhR%2FzbxZ3vrJit%2FR4%252BAeIQ7h0vc%3D