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Autodetection of presence of CT on plug-in KRE2 Connector

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  • Autodetection of presence of CT on plug-in KRE2 Connector

    Dear forum, I need to make an autodetect current transformer circuit. I made simulations with an op amp comparator. Basically, if I have Vin < REF I will have output HIGH and if I have Vin > REF I will have output LOW. I have 3 kind of CTs. Voltage outputs CTs: CT1 (100A:0.333V) and CT2(100A:1V) and current output: CT(100A:5A). I need to adjust my resistive mesh to convert current to voltage. This way I can compare if someone plug CT1 and CT2 I will have Vin < REF(2.5V) and output is HIGH. If someone plug current transformer CT3 I will need to convert it between 2.51V-5V, this way I can measure LOW output and then know which CT was connect and treat my signal after it. Someone know how to help me?
    Attached Files
    Didan
    Junior Member
    Last edited by Didan; 05-28-2019, 06:52 AM.

  • #2
    I made this circuit, but I need adjusts.
    Attached Files

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    • #3
      Maybe this is a very wide topic? Maybe if you try to ask simple and specific questions someone could help? It is not my area, but maybe someone will know the answers.

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