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  1. I am not aware of any mandatory requirements.

    I am not aware of any mandatory requirements.
  2. Thread: Current Flow

    by Besoeker
    Replies
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    496

    The best non-electrical analogy is the pump and...

    The best non-electrical analogy is the pump and pipes.
    The source of pressure (analogous to voltage) pushes water down the pipes. The flow is current.
    More pressure from the pump results in more...
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    Regardless of where posted, the point remains.

    Regardless of where posted, the point remains.
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    Which contradicts this from post #3: ...

    Which contradicts this from post #3:



    That's the point I was getting at.
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    Have you had that in writing?

    Have you had that in writing?
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    With respect, that's an irrelevance. The...

    With respect, that's an irrelevance.
    The conductor size has to carry the current regardless of the voltage.
    90A is 90A

    If the op is correct with his guess that is #14 AWG, then 90A would be...
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    What disadvantages would a a buck a poorer option...

    What disadvantages would a a buck a poorer option than a double wound?
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    You need to make sure you have that in writing.

    You need to make sure you have that in writing.
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    You are correct of course......my apologies... ...

    You are correct of course......my apologies...

    So what if all the load is 125A, 120V single-phase and all it on the same phase to neutral?
    An unlikely scenario I agree, but it demonstrates that...
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    The error is about 0.15V or 0.074%. ...

    The error is about 0.15V or 0.074%.

    Insignificant for this application I would suggest.
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    What if all the load is 125A, 120V single-phase...

    What if all the load is 125A, 120V single-phase and all it on the same phase to neutral?
    An unlikely scenario I agree, but is demonstrates that total kVA only what matters.
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    Oops - should have looked at the forum in which...

    Oops - should have looked at the forum in which is was posted......
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    Per the OP "output continuous current." Assuming...

    Per the OP "output continuous current."
    Assuming a 3-phase input, the input current will be a bit lower.
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    The early break aux contacts ought to prevent...

    The early break aux contacts ought to prevent that.
    But the usual specification imposed on us is fault make load break.
    It's customer driven.
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    32$$
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    946

    Each transformer?

    Each transformer?
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    32$$
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    946

    Exactly why/how would it do that?

    Exactly why/how would it do that?
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    32$$
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    Why, how would not connecting the neutral fix...

    Why, how would not connecting the neutral fix that?
    What if the WYE input was perfectly balanced and the delta output load was extremely unbalanced - where would that put the unconnected input star...
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    Not at all. Where would you get an extremely...

    Not at all.
    Where would you get an extremely unbalanced wye input?
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    Transformer manufacturers can make any...

    Transformer manufacturers can make any configuration you heart could possibly desire.
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    On the wrong direction of the wind or a bad case...

    On the wrong direction of the wind or a bad case of flatulence or whatever.
    I still don't see why connecting the neutral to the star point is a bad thing.
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    32$$
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    Surely we should be looking at line to neutral...

    Surely we should be looking at line to neutral voltages.
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    Still make no sense to me. Perhaps I framed my...

    Still make no sense to me.
    Perhaps I framed my question badly.
    A floating neutral on the input wye side would allow the phase voltages to go unbalanced.
    So, to make the question simpler, what is...
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    I've seen that here before but don't see why you...

    I've seen that here before but don't see why you shouldn't.
    Surely a floating neutral on a wye winding would allow the phases to go unbalanced?
  24. Thread: VFD current

    by Besoeker
    Replies
    9$$
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    358

    The output current is usually a pretty good sine...

    The output current is usually a pretty good sine wave.
    The voltage is sine wave weighted pulse width modulated and the inductance of the motor results in the current being sinusoidal. More or less....
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    I have actual test data on a 400kVA unit. It's a...

    I have actual test data on a 400kVA unit.
    It's a Ddyn11.

    No load power factor is sort of comparable with yours at 0.16.
    But, in real world terms, something of an irrelevance given that no load...
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