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Phase balance

Kelly Marie Angel
I saw a video on YT where they showed 2 heaters each one drew 8.3 amps  one was on red phase second was on yellow phase  then the guy showed the neutral current as 8.3 amps I would of thought it would of been 0 as the blue phase was completely unloaded  whilst I'm not doubting the guys results im a little surprised is all
  • 0
    If all THREE phases are equally loaded, then the neutral current will be zero in theory. Manufacturing tolerances and slightly differing voltages on each phase may produce a very small neutral current.


    If only TWO phases of a three phase four wire supply are equally loaded, then the neutral current will be the same as the phase current, in theory, or very nearly the same in practice.
  • 0
    OK thanks Broadgage
  • 0
    Or think of it another way for a quick reckon.

    The largest N current is when there is the biggest difference( vectorally).

    That biggest difference is when two phase are at X and one phase is at Y.

    Either X or Y is zero and the other (X in the case of Y or Y in the case of X) is at max.


    so !0A + 10A  + 0A = 10A at N and

    0A + 0A + 10A = 10A at N.

    The pluses are added vectorally not arithmetically

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