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Last Post 05/02/2014 1:32 PM by  Tony Hodges
DC Immune
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Randy Smith
New Member
New Member
Posts:1


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05/02/2014 8:50 AM
    I've got a DC load design that I'm adding an AC voltage to. The AC doesn't cross zero so I have to add a DC offset.

    I need to measure total current and the CT I'm using just isn't delivering the correct AC value. I'm convinced the DC component of the signal is skewing the RMS value somehow.

    I see that CR makes CTs that are DC immune which is exactly what I need. Question is, in a nutshell how does that work? Does the CT simply ignore the DC component somehow?

    Thank you,

    Randy
    Tony Hodges
    CRM Staff
    Basic Member
    Basic Member
    Posts:154


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    05/02/2014 1:32 PM
    Dear Sir,

    In typical magnetic material, DC will cause the material to saturate and eventually become magnetized and unusable. The core must be reset every cycle. The special cobalt alloy that is in the DC immune CT's will not react to the DC signal and will only react to the AC component. I have attached our the catalog page for our CR8300 Series which includes DC Immune. These can also be customized with wire leads if you need. Thank you for the opportunity and I look forward to working with you.
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