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Neutral CT testing with no nameplate data

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    Neutral CT testing with no nameplate data

    Do you have find ct ratio on a neutral ct? I have done a trip/ no trip successfully. Its on a GE TSKG412.
    There is no ratio on the data plate. I was getting a ratio around 30000:5 on a 1200A system.

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    Quote Originally Posted by AMPPOMY84 View Post
    Do you have find ct ratio on a neutral ct? I have done a trip/ no trip successfully. Its on a GE TSKG412.
    There is no ratio on the data plate. I was getting a ratio around 30000:5 on a 1200A system.

    Its hard telling what it is. Manufacturers do all kinds of nonstandard stuff when it comes to these sensors. It could be a 1 amp secondary, 4-20mA output, etc.

    I would just treat the whole thing as a ground fault system and consider neutral CT testing complete at this point. Maybe consider checking what its wired for and if it is designed for that trip unit.

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