ADE7953 single phase three wire for 4CT


       Customer use ADE7953 single phase three wire. To use CT induced current through below circuits input to IA channel of ADE7953. Power source is 220Vac and get total power to meet 0.5 class.

      Due to customer request Line A and Line B current needs accuracy (<0.1A). So it add another CT to measure individual current and angle value. If use below 4CT design for actual testing, it is indeed to meet 0.5 class. But is it indeed ok for below 4CT design and connection? Has any problem for it? 

      It is a little urgent and look forward to receive reply. Thank you. 




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[edited by: at 7:07 AM (GMT -4) on 14 May 2021]
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  • +1
    •  Analog Employees 
    on May 17, 2021 5:42 PM in reply to PChen833

    You are showing 2 ct's on the IAP and IAN inputs you can only connect 1. 

    I also am assuming the mux on channel b will select either Line a ct or line b ct. 

  • Hello Dave

                Thanks for reply. For above topology, Channel A measure current and voltage for total power measurement. Customer also add additional on Line A and Line B CT that go mux to switch Line A or Line B for reading current (Line A or Lin B) on Channel B.

                 Channel B is just only assist to read current for total power calculation. The product is actually testing on Building environment. The testing is ok now to get more accuracy power measurement. But customer needs us to check have any risk on this topology due to the testing looks good now? 

                 It is a little urgent and look forward to receive your comments. Thanks. 




  • +1
    •  Analog Employees 
    on May 18, 2021 7:59 PM in reply to PChen833

    You should only have one ct on channel A  this would be for total power/ energies and so on

    When you mux channel b you will need to wait for the irms to stabilize. This would be for rms only.