I have read somewhere that using Shunt resistor can be used only with Line or neutral. I wonder why can not I use 2 shunts to measure current in line and neutral?
In short, if you use shunts to measure line and neutral (ie no isolation) you end up putting entire line voltage across chip.
Lets say your system reference is neutral. Then, If you connect a shunt on neutral , you measure the voltage across the shunt referenced to neutral.This should be fine.
But with neutral reference, if you have a shunt on line and connect it to the IC, then the voltage across chip pins is the line to neutral voltage. This will definitely damage the 3.3/5V chip.
thanks , I understand .
but are not there any workaround to use another shunt with neutral? We need to measure current on both line and neutral , and in the same time, we want to have small size in components, so using CT/rogowiski on the neutral is bulky.
do you suggest any measuring element with small size to measure the current on the neutral?
if you want to measure neutral and line current, you need isolation. Please have a look at ADE7912/ADE7913 which can enable measurements using shunts
but this isolator is converting from ADC to SPI, and this is not what I need. I need to use the other neutral channel of ADE7953 , so my microcontroller may get the whole data from ADE7953
you cannot use ADE7953 with shunts on line and neutral simultaneously. You can only use shunt on one channel and an isolated sensor on the other(CT/rogowski/hall effect,etc)
If you want meteorology computations with two shunts, you can look at ADE7932+ADE7978 combination.
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