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Thread: Stepping up/down voltage from incoming feed???

  1. #16

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    Quote Originally Posted by jwelectric
    It will be quite significant.

    The only way that they can have 480 at the secondary and 240 at the same time is to have two different transformer banks.

    According to them, they have 480V. Then you pay them for a transformer that outputs 240V which they place on your property.

  2. #17
    Consultant cwhyu2's Avatar
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    I know in our area 240 v is max for resdental .I do think 480v would help.
    But if your equipment dims the lights in your house ,v/d &distance is problem.
    If you wanted that much power I would gone 3 phase and then step down
    to single phase.

  3. #18
    DIY Senior Member BrianJohn's Avatar
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    JW>

    The exciatation current ot the tansformer will be between 1-2 amps. or 240-480 watts INSIGINFICANT, in the overall scheme oif things.

    As noted the amperage gained will also be insignificant. You could save money (as noted above) utilizing one transformer 1 to 1 with adjustable taps set to minimize the efects of the VD.

  4. #19

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    0.240 kw X 8760 hrs/yr X $0.07/KW-H = $147/YR or $12.26/month

    That isn't bad, but with two transformers, this would double. If the loss is more like 480 watts, then this would quadriple. That is getting to be too much. I will look into the single transformer with multiple output taps....

    Thanks again...

    Chris

  5. #20
    Plumber jimbo's Avatar
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    Wow! You guys are stealing electricity at $.07 per kwh??? Redo that calculation at $.18 and you are starting to eat into your beer money!

  6. #21
    DIY Senior Member BrianJohn's Avatar
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    An other option would be to utilize a buck boost transformer, MUCH cheaper, less heat gain, less exciatrion current loses and smaller foot print.

    http://www.electricalpowertransforme...uck-boost.html


    Very practical to overcome low voltage, once again you would need to arrive at an average safe voltage between no load VD and full load VD, that is acceptable to your use.
    Last edited by BrianJohn; 08-25-2007 at 11:38 PM.

  7. #22
    In the Trades Bob NH's Avatar
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    Default Doubling Voltage Cuts Power and Voltage Drop to 1/4

    Increasing the transmission voltage from 240 to 480 will cut the power loss in the wire by a factor of 4. The math is as follows.

    The current (amps) will be 1/2 for the same load. Power loss is Amps squared x resistance. The resistance is constant (not changing the wire) so the power loss is 1/2 squared = 1/4.

    It will also cut the voltage drop as a percentage of supply voltage by a factor of 4. Since the current is 1/2 and the resistance is the same, the acutal voltage drop with a 480 supply is 1/2 of the voltage drop for the same power load on a 240 Volt supply; but 1/2 the voltage drop with twice the supply voltage (480 vs 240) is only 1/4 of the percentage voltage drop. When you convert it back to 240 you will have only 1/4 the voltage drop that you would have with the same power load on a 240 Volt transmission line.

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