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  1. Thread: Xfmr voltage

    by Besoeker
    Replies
    6$$
    Views
    248

    Nominally 400/230.

    Nominally 400/230.
  2. Replies
    8$$
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    281

    Easier is P=Tw w being omega, symbols don't...

    Easier is P=Tw

    w being omega, symbols don't seem to work here.
  3. Replies
    51$$
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    1,979

    On the other hand, you could measure and analyse...

    On the other hand, you could measure and analyse your supply voltage and get back to me when you have done that.

    And, FWIW, the oceans account for 1,314,829,398,016,000,000 cubic metres of water.
  4. Replies
    51$$
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    1,979

    Might I politely suggest that you do some...

    Might I politely suggest that you do some measurements and then you might be in a position to validate your points.
  5. Replies
    6$$
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    239

    Care to share? :p

    Care to share?
    :p
  6. Replies
    6$$
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    239

    The world is SI.

    The world is SI.
  7. Replies
    51$$
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    1,979

    I wouldn't. So we may have to agree to disagree....

    I wouldn't. So we may have to agree to disagree.
    But you might like to consider where that 5% comes from.
  8. Replies
    51$$
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    1,979

    You might be surprised. And it depends on what...

    You might be surprised. And it depends on what you call clean.
    I was visiting Toshiba Houston a few years ago. The supply was not all that great when I checked it.
  9. Replies
    51$$
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    1,979

    That's not actually correct. The UK commonly uses...

    That's not actually correct. The UK commonly uses 11kV to 400V for distribution. I have measured harmonic distortion at the 11kV level that was outside the limits of what was deemed acceptable.
    Had...
  10. Replies
    51$$
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    1,979

    Tektronix TD210 with the optional serial port. ...

    Tektronix TD210 with the optional serial port.

    http://i36.photobucket.com/albums/e39/Besoeker/X-Ymode_zpsb5f726f1.jpg
  11. Replies
    51$$
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    1,979

    I use a digital scope with a backlit LED display....

    I use a digital scope with a backlit LED display.
    It gives excellent results and I can dump the data into a spreadsheet for later analysis.
    ...
  12. Replies
    51$$
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    1,979

    Looks like third.

    Looks like third.
  13. Yes. If you over correct it is likely to increase...

    Yes. If you over correct it is likely to increase the voltage.
  14. Replies
    51$$
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    1,979

    Yes, I know about IEEE 519. We ship equipment to...

    Yes, I know about IEEE 519. We ship equipment to countries where we have to comply.
  15. Replies
    51$$
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    1,979

    Bear in mind that's current, not voltage.

    Bear in mind that's current, not voltage.
  16. Replies
    51$$
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    1,979

    Third actually and some resonance. It's a single...

    Third actually and some resonance.
    It's a single phase system.
    I do a lot of calculations for my colleagues in the lighting division. Single phase dimmers. Third harmonics dominate.
  17. Replies
    51$$
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    1,979

    This current waveform was also taken at home: ...

    This current waveform was also taken at home:

    http://i36.photobucket.com/albums/e39/Besoeker/Lightload_zps6bdcab73.jpg

    I don't imagine ours unique. Multiply that by the number of residences fed...
  18. Replies
    51$$
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    1,979

    Yes, the lower the supply impedance the lower the...

    Yes, the lower the supply impedance the lower the distortion. If the supply was infinitely stiff there would be no distortion. But real life kicks in.

    I'll add something to your comments about...
  19. Replies
    51$$
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    1,979

    Non linear loads.

    Non linear loads.
  20. Replies
    6$$
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    267

    A picture that might help. The blue is the load...

    A picture that might help.
    The blue is the load current. I've used per unit values for the graph. Any multiplier can be applied.
    ...
  21. Depending on the size of transformer you might...

    Depending on the size of transformer you might have a problem getting a contactor to operate in that time but I wouldn't have thought it critical anyway.
  22. Replies
    4$$
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    293

    Ultracapacitors can do this. But one thing to...

    Ultracapacitors can do this. But one thing to remember is that faster charging requires more power. For example, charging batteries for EVs takes hours from a domestic supply because of its limited...
  23. Replies
    37$$
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    1,435

    Fair point.

    Fair point.
  24. Replies
    37$$
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    1,435

    You are billed for energy consumption. ...

    You are billed for energy consumption.




    It's called brain fart.
  25. Replies
    37$$
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    1,435

    kWh isn't a measurement for watts. Its energy.

    kWh isn't a measurement for watts. Its energy.
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