I was wondering whether we could use current shunts with ADE7878. Is there any isolation required? I am worried becaus the datasheet explains the use of current transformers or rogowski's coil only.
It is not possible to use shunt current sensors on all three phases when using a three-phase metering IC such as ADE7878. It is conceptually not possible. The three phase metering IC would have just a single ground potential, whereas while using shunts, you will need to tie one end of each of the shunts to a separate ground potential. But instead, if you are using only one of the three phases in ADE7878, you can use a shunt sensor for sensing the current with no issues.
If you are looking for 3-phase metering solutions using shunt sensors, then I would suggest that you consider ADE7933/ADE7978 chipset products. The chipset is a combination of 4 ICs typically. ADE7933 is an isolated ADC. ADE7932 is also an option. ADE7978 is the metering computation IC. You would use one ADE7933/32 for each of the three phases and an ADE7978 for doing metering computations for all three phases together. This arrangement gives the flexibility to have three separate grounds for three phases and hence shunts are possible. You can use a ADE7923 (non-isolated version of ADE7933) IC for the neutral current sensing, if need be.
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