Subject:
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Re: Metroliner question
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 22 Feb 2002 11:41:52 GMT
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Viewed:
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1047 times
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> AC power is more efficient and can travel longer
> distances, therefore requiring less voltage. (or something like that.)
High School Physics:
To get the same efficiency from DC, we'd literally need a power station in
every district of a city/town.
Despite that, AC power distribution is High Voltage/Low Current (was DC the
same?) as this ensures low power losses (can’t remember the relationship).
Supply AC voltage is lowered (and current raised) at what we call
"sub-stations" in the UK (big transformers?). Key to this is that power (exc
losses) is the same for both supply & distribution: Power = Volts * Amps. In
the UK, most supply points (exc hobs, showers etc ) are 13A / 240v. That
gives us 3.1kw. I assume supplies with 110v have higher current?
What I keep meaning to understand is 3-phase AC... but not today!
Scott A
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Message has 1 Reply:
 | | Re: Metroliner question
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| (...) in part true. Mostly because of transformers rasing voltage/reducing amps for same HP/wattage. (that's why long distance power cables are at 500 KV or even 750 KV, because it allows low amp power supply of massive amounts of power-the amps (...) (23 years ago, 23-Feb-02, to lugnet.trains)
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Message is in Reply To:
| | Re: Metroliner question
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| You may be correct, as I really have never seen or studied the systems of which we are referring. My aspects were only mere assumption. I base my hypothesis on a bit of history from the Edison era. In his thriving days of supplying power to the (...) (23 years ago, 22-Feb-02, to lugnet.trains)
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