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DC on AC supply

nicemark
I have seen a number of videos which demonstrate the problems caused by DC currents on AC supplies with respect to RCD's. An issue which is apparently increasing with increased technology applications.  Please could someone explain how DC gets back into the neutral.


Almost all PSU's in all equipment begin with an isolating transformer. So getting a significant pulsed "dc" signal back that way is not impossible but tricky. (Pulses only occurring on one side of the cycle). 


My thoughts are that the DC is most often "created" by an unbalanced waveform, with a muted positive cycle, giving an overall DC flow.


Please could you direct me to, or give examples of how DC gets into the neutral, and/or just how much of an issue it can be in some homes.
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  • Former Community Member
    0 Former Community Member
    Nathaniel:

    A generally accepted definition of 'dc' appears beyond what humans can agree on!


    Any current which is not alternating?


    For some reason, I am reminded of the brothers Jacob and Esau who were smooth and hairy respectively (Genesis 27:11). I quite like the idea of "hairy DC". 


    DC is a "new" name for what was originally called Continuous Current.................


    Regards


    BOD


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  • Former Community Member
    0 Former Community Member
    Nathaniel:

    A generally accepted definition of 'dc' appears beyond what humans can agree on!


    Any current which is not alternating?


    For some reason, I am reminded of the brothers Jacob and Esau who were smooth and hairy respectively (Genesis 27:11). I quite like the idea of "hairy DC". 


    DC is a "new" name for what was originally called Continuous Current.................


    Regards


    BOD


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