Newsgroups: comp.dcom.telecom.tech
Subject: Re: 10base-T & POTS in same Cat-5 cable?
References: <[email protected]>
Rick Merrill writes:
> Morten Reistad wrote:
>
> ...
> > But the problem from Europe is smaller, since the whole
> > continent is not in sync.
>
> If the 50 Hz is not in sync, does that mean they cannot
> buy and sell electric power across unsynchronized borders?
There are regions that can cover several countries that are
run in sync. So with those it is quite easy to buy and sell
electric power across the borders.
And there are solutions for bying and seling electric power
across unsynchronized borders. The most common solution is
DC power links. The power is converted at one end to high
voltage DC, transfered as DC through long distance (for example
across tens or hundreds of kilometers of sea) and then
converted back to AC syncronous to the network at receiving end.
And those links are designed in such way that they can be
run in both directions as needed.
There are also frequency conversion units that can convert
electricity between different networks...
Ectricity is sold and bough actively between many Northern European
countries through Nordpool http://www.nordpool.com/
Nordpool is the Nordic electricity exchange for physical electricity trade.
There is a quite real time display (updates every 3 minutes)
how much electricity goes in and out of Finland at
http://www.fingrid.fi/portal/in_english/electricity_market/state_of_power_system/
If you browse around you can also
The European Union aims to create a European internal electricity
market.
--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/